--- title: "What Are Key Quality Checks for Standard Injection Molds for Fastening Applications?" description: "Frequent appearance defects and dimensional deviations in batch production of injection molded fastening parts lead to high scrap rates and failed assembly compliance. Optimize mold structure selection, material matching, and quality control nodes for standard injection molds for fastening applications to improve production yield and ensure end-use fit performance." url: "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html" language: "en" type: "Q&A" category: "Injection Molding Q&A" datePublished: "2026-09-26" dateModified: "2026-09-26" brand: "OK TOOL" manufacturer: "OK TOOL" answerCount: 9 --- # What Are Key Quality Checks for Standard Injection Molds for Fastening Applications? ## Question I’m a quality engineer at a mid-sized electrical component assembly plant, and we recently sourced a new set of standard injection molds for fastening application to produce PA66 plastic screw caps for outdoor electrical enclosure assembly. Over the first three consecutive 10k unit production runs, we’ve recorded a 12% to 18% scrap rate, which is 3x our acceptable threshold. 60% of the defects are flash along the inner thread mating surface, 30% are ±0.18mm dimensional deviation on the inner thread pitch that makes the cap fail to screw onto matching metal studs, and the remaining 10% are sink marks on the cap head surface. We’ve already adjusted injection pressure, holding time, and cooling cycle parameters on the machine side, but those changes only reduced the scrap rate by 2% at most. We need to determine if the issue originates from the standard mold’s inherent design, material suitability for our specific use case, or if we missed critical pre-production validation steps for this type of mold, and what actionable checks we should prioritize first to resolve this before our next production run scheduled in 7 days, as we have a 120k unit customer order due in 3 weeks. ## Answers ### Answer 1 — Best Answer Standard fastening injection molds differ from custom molds primarily in their pre-set universal specifications, including general thread dimensions, cavity counts, and basic structural design, which are built to fit most common low-to-medium demand fastening use cases at a lower cost and shorter lead time. However, their preset tolerance bands, venting layouts, and parting line designs are not optimized for niche application requirements, which is the most common root cause of unresolvable defects even after machine parameter adjustments. First, confirm the standard mold’s stated tolerance range. **Standard fastening injection molds for general use typically have a thread pitch tolerance of ±0.2mm, which is not suitable for applications that require mating with precision metal studs that have ±0.08mm tolerance bands**. If your PA66 parts have a post-molding shrinkage rate of 1.2% to 1.8% (common for glass-filled PA66), the unadjusted standard mold cavity dimensions will lead to pitch deviations after cooling, which matches the 30% dimensional defects you are seeing. Next, evaluate the mold’s parting line and venting design. Standard molds for low-demand fastening applications, such as consumer product internal fasteners, often have wider parting line gaps to reduce mold manufacturing cost, and only 2 to 3 venting points per cavity, which leads to flash when processing higher-viscosity glass-filled PA66, especially at the thin thread section. The lack of sufficient venting also causes uneven material filling, leading to sink marks on the cap head even if you adjust machine parameters. For applicable scenarios, standard fastening injection molds are ideal for general-purpose fastening parts with non-critical fit requirements, such as internal plastic clips for furniture, or low-torque fasteners for consumer electronics, where tolerance bands of ±0.2mm and 5% scrap rate are acceptable. For high-demand use cases like outdoor electrical enclosures that require vibration resistance and waterproof sealing, standard molds require minor targeted adjustments before formal production. **Prioritize three pre-production checks before your next run: first, measure the mold cavity thread pitch against your part’s drawing to confirm if the preset dimension already accounts for PA66 shrinkage; second, inspect the parting line gap at the thread section, which should be no more than 0.02mm for PA66 processing; third, run a 100-unit short shot test to map venting efficiency across all cavities**. If the mold’s thread dimension is not adjusted for shrinkage, you can apply a temporary PTFE coating on the thread cavity to reduce the effective diameter while you request a permanent mold modification from your supplier. If venting is the issue, you can add temporary micro-vent cuts at the thread end to reduce flash and sink marks before formal venting modifications are completed. To avoid similar issues in future standard mold purchases, specify your application’s tolerance requirement, material shrinkage rate, and defect threshold in your RFQ, and request a 500-unit pre-production validation run before accepting the mold, to catch mismatches between standard mold specifications and your project requirements early. **status:** accepted **Author:** Daniel Yang **Date:** 2026-09-26 ### Answer 2 Establish tiered inspection checkpoints for standard fastening injection molds before formal production. First, during incoming mold inspection, measure 5 critical dimensions per cavity, including thread pitch, inner diameter, parting line gap, gate size, and vent depth, and cross-reference these against your part drawing requirements and material shrinkage data. For in-process production checks, set a sampling rate of 5 units per cavity every 30 minutes, with zero tolerance for flash on thread surfaces and pitch deviations exceeding ±0.1mm for your application. For defects that appear after parameter adjustment, implement a root cause analysis workflow that categorizes defects by cavity to identify if the issue is isolated to specific cavities or affects the entire mold set. Classify defects into critical (thread fit failure), major (flash that affects assembly), and minor (aesthetic sink marks that do not impact function) to prioritize corrective actions, and create a defect tracking log to monitor improvement after each adjustment. **status:** suggested **Author:** Michael Wu **Date:** 2026-09-26 ### Answer 3 Verify the CNC machining precision of the standard mold’s thread insert components, as most standard molds use pre-machined thread inserts with looser machining tolerances to reduce production cost. The thread profile on the insert should have a surface roughness of Ra 0.8μm or lower to ensure smooth material flow and easy part ejection, and the pitch error across the entire thread length should be no more than 0.05mm to avoid cumulative dimensional deviation after part shrinkage. If the existing insert’s machining tolerance is outside this range, you can rework the thread profile using high-precision CNC milling with a diamond-coated cutter to adjust the pitch dimension to match your shrinkage requirement, instead of replacing the entire insert. Ensure that the fixture used to hold the insert during rework has a concentricity error of less than 0.01mm to avoid introducing new dimensional deviations during the rework process. **status:** suggested **Author:** Sophia Wang **Date:** 2026-09-26 ### Answer 4 Cross-reference the defect data with your end-use assembly requirements to prioritize corrective actions that align with field performance needs. For your outdoor electrical enclosure application, the thread fit deviation is the most critical defect, as a loose fit will lead to water ingress and reduced vibration resistance over the product’s 10-year service life. Run assembly tests with 100 randomly selected defective parts to identify the exact pitch deviation threshold that leads to assembly failure, and adjust your mold dimension requirements to leave a 0.05mm buffer for post-assembly torque stress and temperature-related expansion and contraction. If the sink marks on the cap head are only aesthetic and do not impact the torque resistance of the fastener, you can adjust your quality acceptance criteria to allow minor sink marks as long as the head thickness meets the minimum structural requirement, to reduce unnecessary scrap during the urgent production run. **status:** suggested **Author:** Jason Zhou **Date:** 2026-09-26 ### Answer 5 Align any mold adjustments with your production line’s existing capacity and cycle time requirements to avoid delaying your 120k unit order. If you implement temporary vent cuts to reduce flash and sink marks, test the impact on cycle time first, as improved venting can reduce the required holding pressure and cooling time by up to 10%, which can help you make up for lost production time from earlier scrap. Ensure that any mold modifications do not increase ejection force beyond the capacity of your existing injection molding machine’s ejection system, as higher ejection force will increase cycle time and lead to higher risk of part deformation during ejection. For the upcoming production run, arrange to run the mold on a machine with a more consistent temperature control system to reduce dimensional variation caused by uneven cooling across cavities, which can reduce scrap by an additional 3% to 5% without requiring mold changes. **status:** suggested **Author:** Eric Zhao **Date:** 2026-09-26 ### Answer 6 Evaluate the tolerance stack-up between your plastic fastening cap and the matching metal stud to identify if the standard mold’s tolerance range is compatible with your existing component supply chain. The total allowed tolerance for the assembly is the sum of the metal stud’s outer thread tolerance, the plastic cap’s inner thread tolerance, and the tolerance from post-molding shrinkage and temperature expansion. If your metal stud supplier has tightened their thread tolerance in the last 6 months without notification, the standard mold’s original tolerance range will no longer be compatible, even if it worked for previous production runs. Adjust your mold’s thread dimension to account for the updated metal stud tolerance, and implement a pre-production assembly test with 100 units of both components to verify fit before full production, to avoid batch scrap caused by mismatched component tolerances. **status:** suggested **Author:** Rachel Huang **Date:** 2026-09-26 ### Answer 7 Map all corrective actions to your 7-day pre-production timeline and 3-week delivery deadline to prioritize actions that deliver the fastest improvement with minimal risk. First, allocate 2 days for mold inspection and short shot testing, 1 day for any minor temporary adjustments like vent cuts or PTFE coating, and 1 day for a 500-unit trial run to validate improvement, leaving 3 days as buffer for any unexpected issues. If permanent mold modifications are required that take longer than 7 days, negotiate a split delivery with your customer to ship 60k units produced with the temporarily adjusted mold first, while the permanent modification is completed for the remaining 60k units. Ensure that all mold adjustments are documented and signed off by both your quality and engineering teams before implementation, and update your standard mold procurement SOP to require pre-production validation runs for all new mold sets going forward to avoid similar delays in future projects. **status:** suggested **Author:** Linda Xu **Date:** 2026-09-26 ### Answer 8 Evaluate the standard mold’s gate location and cavity layout to identify design choices that contribute to your defect issues. Most standard fastening injection molds use a side gate located on the outer edge of the cap head, which leads to uneven material flow towards the thread section at the bottom of the part, causing uneven shrinkage that leads to pitch deviation and sink marks. If the gate size is larger than 1.2mm for PA66 processing, it can also lead to higher residual stress in the part, which increases post-molding shrinkage variation across cavities. For minor adjustments, you can reduce the gate size by 0.2mm to improve flow balance and reduce residual stress, which can reduce dimensional deviation by up to 40% without requiring changes to the cavity structure. If you plan to use the mold for long-term production, consider relocating the gate to the center of the cap head to improve flow balance across the entire part. **status:** suggested **Author:** David Zhang **Date:** 2026-09-26 ### Answer 9 Implement a structured yield improvement workflow for the standard fastening mold to deliver both short-term fixes for your urgent order and long-term sustainable quality gains. For the short term, use a Pareto analysis to focus on the top two defects (flash and thread pitch deviation) that account for 90% of your scrap, and track the impact of each adjustment on defect rate to avoid wasting time on low-impact changes. For the long term, use 5S methodology to standardize mold storage, pre-production inspection, and parameter setup processes to reduce variation between production runs. Implement a preventive maintenance schedule for the mold that includes cleaning vents and checking parting line gaps every 50k production cycles, to prevent defect rates from increasing as the mold wears during use. You can also collect shrinkage data across 10 production runs to create a material-specific shrinkage adjustment table for standard molds, to reduce validation time for future mold purchases. **status:** suggested **Author:** Kevin Liu **Date:** 2026-09-26 ## Related Resources - [Injection Molding Q&A](https://www.ok-tool.com/qa/injection-molding/) - [Plastic Injection Molding](https://www.ok-tool.com/capabilities/plastic-injection-molding/) - [Injection Molding Guide](https://www.ok-tool.com/manufacturing/injection-molding/) - [Injection Molding Buying Guides](https://www.ok-tool.com/buying/injection-molding/) - [Products](https://www.ok-tool.com/products/) - [Custom Manufacturing](https://www.ok-tool.com/custom-manufacturing/) - [Manufacturing Knowledge Base](https://www.ok-tool.com/knowledge/) - [Injection Molding](https://www.ok-tool.com/knowledge/injection-molding/) ## Structured Data ```json [ { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "What Are Key Quality Checks for Standard Injection Molds for Fastening Applications?", "text": "I’m a quality engineer at a mid-sized electrical component assembly plant, and we recently sourced a new set of standard injection molds for fastening application to produce PA66 plastic screw caps for outdoor electrical enclosure assembly. Over the first three consecutive 10k unit production runs, we’ve recorded a 12% to 18% scrap rate, which is 3x our acceptable threshold. 60% of the defects are flash along the inner thread mating surface, 30% are ±0.18mm dimensional deviation on the inner thread pitch that makes the cap fail to screw onto matching metal studs, and the remaining 10% are sink marks on the cap head surface. We’ve already adjusted injection pressure, holding time, and cooling cycle parameters on the machine side, but those changes only reduced the scrap rate by 2% at most. We need to determine if the issue originates from the standard mold’s inherent design, material suitability for our specific use case, or if we missed critical pre-production validation steps for this type of mold, and what actionable checks we should prioritize first to resolve this before our next production run scheduled in 7 days, as we have a 120k unit customer order due in 3 weeks.", "answerCount": 9, "upvoteCount": 7, "datePublished": "2026-09-26T05:57:47Z", "dateModified": "2026-09-26T06:10:11Z", "author": { "@type": "Person", "name": "Anonymous", "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html" } ,"acceptedAnswer": { "@type": "Answer", "text": "Standard fastening injection molds differ from custom molds primarily in their pre-set universal specifications, including general thread dimensions, cavity counts, and basic structural design, which are built to fit most common low-to-medium demand fastening use cases at a lower cost and shorter lead time. However, their preset tolerance bands, venting layouts, and parting line designs are not optimized for niche application requirements, which is the most common root cause of unresolvable defects even after machine parameter adjustments. First, confirm the standard mold’s stated tolerance range. Standard fastening injection molds for general use typically have a thread pitch tolerance of ±0.2mm, which is not suitable for applications that require mating with precision metal studs that have ±0.08mm tolerance bands . If your PA66 parts have a post-molding shrinkage rate of 1.2% to 1.8% (common for glass-filled PA66), the unadjusted standard mold cavity dimensions will lead to pitch deviations after cooling, which matches the 30% dimensional defects you are seeing. Next, evaluate the mold’s parting line and venting design. Standard molds for low-demand fastening applications, such as consumer product internal fasteners, often have wider parting line gaps to reduce mold manufacturing cost, and only 2 to 3 venting points per cavity, which leads to flash when processing higher-viscosity glass-filled PA66, especially at the thin thread section. The lack of sufficient venting also causes uneven material filling, leading to sink marks on the cap head even if you adjust machine parameters. For applicable scenarios, standard fastening injection molds are ideal for general-purpose fastening parts with non-critical fit requirements, such as internal plastic clips for furniture, or low-torque fasteners for consumer electronics, where tolerance bands of ±0.2mm and 5% scrap rate are acceptable. For high-demand use cases like outdoor electrical enclosures that require vibration resistance and waterproof sealing, standard molds require minor targeted adjustments before formal production. Prioritize three pre-production checks before your next run: first, measure the mold cavity thread pitch against your part’s drawing to confirm if the preset dimension already accounts for PA66 shrinkage; second, inspect the parting line gap at the thread section, which should be no more than 0.02mm for PA66 processing; third, run a 100-unit short shot test to map venting efficiency across all cavities . If the mold’s thread dimension is not adjusted for shrinkage, you can apply a temporary PTFE coating on the thread cavity to reduce the effective diameter while you request a permanent mold modification from your supplier. If venting is the issue, you can add temporary micro-vent cuts at the thread end to reduce flash and sink marks before formal venting modifications are completed. To avoid similar issues in future standard mold purchases, specify your application’s tolerance requirement, material shrinkage rate, and defect threshold in your RFQ, and request a 500-unit pre-production validation run before accepting the mold, to catch mismatches between standard mold specifications and your project requirements early.", "upvoteCount": 7, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#acceptedAnswer", "datePublished": "2026-09-26T07:46:44Z", "author": {"@type": "Person","name": "Daniel Yang","url": "https://www.ok-tool.com/team/daniel.html"} } ,"suggestedAnswer": [ { "@type": "Answer", "text": "Establish tiered inspection checkpoints for standard fastening injection molds before formal production. First, during incoming mold inspection, measure 5 critical dimensions per cavity, including thread pitch, inner diameter, parting line gap, gate size, and vent depth, and cross-reference these against your part drawing requirements and material shrinkage data. For in-process production checks, set a sampling rate of 5 units per cavity every 30 minutes, with zero tolerance for flash on thread surfaces and pitch deviations exceeding ±0.1mm for your application. For defects that appear after parameter adjustment, implement a root cause analysis workflow that categorizes defects by cavity to identify if the issue is isolated to specific cavities or affects the entire mold set. Classify defects into critical (thread fit failure), major (flash that affects assembly), and minor (aesthetic sink marks that do not impact function) to prioritize corrective actions, and create a defect tracking log to monitor improvement after each adjustment.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-2", "datePublished": "2026-09-26T07:45:57Z", "author": {"@type": "Person","name": "Michael Wu","url": "https://www.ok-tool.com/team/michael.html"} } , { "@type": "Answer", "text": "Verify the CNC machining precision of the standard mold’s thread insert components, as most standard molds use pre-machined thread inserts with looser machining tolerances to reduce production cost. The thread profile on the insert should have a surface roughness of Ra 0.8μm or lower to ensure smooth material flow and easy part ejection, and the pitch error across the entire thread length should be no more than 0.05mm to avoid cumulative dimensional deviation after part shrinkage. If the existing insert’s machining tolerance is outside this range, you can rework the thread profile using high-precision CNC milling with a diamond-coated cutter to adjust the pitch dimension to match your shrinkage requirement, instead of replacing the entire insert. Ensure that the fixture used to hold the insert during rework has a concentricity error of less than 0.01mm to avoid introducing new dimensional deviations during the rework process.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-3", "datePublished": "2026-09-26T07:10:20Z", "author": {"@type": "Person","name": "Sophia Wang","url": "https://www.ok-tool.com/team/sophia.html"} } , { "@type": "Answer", "text": "Cross-reference the defect data with your end-use assembly requirements to prioritize corrective actions that align with field performance needs. For your outdoor electrical enclosure application, the thread fit deviation is the most critical defect, as a loose fit will lead to water ingress and reduced vibration resistance over the product’s 10-year service life. Run assembly tests with 100 randomly selected defective parts to identify the exact pitch deviation threshold that leads to assembly failure, and adjust your mold dimension requirements to leave a 0.05mm buffer for post-assembly torque stress and temperature-related expansion and contraction. If the sink marks on the cap head are only aesthetic and do not impact the torque resistance of the fastener, you can adjust your quality acceptance criteria to allow minor sink marks as long as the head thickness meets the minimum structural requirement, to reduce unnecessary scrap during the urgent production run.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-4", "datePublished": "2026-09-26T07:05:57Z", "author": {"@type": "Person","name": "Jason Zhou","url": "https://www.ok-tool.com/team/jason.html"} } , { "@type": "Answer", "text": "Align any mold adjustments with your production line’s existing capacity and cycle time requirements to avoid delaying your 120k unit order. If you implement temporary vent cuts to reduce flash and sink marks, test the impact on cycle time first, as improved venting can reduce the required holding pressure and cooling time by up to 10%, which can help you make up for lost production time from earlier scrap. Ensure that any mold modifications do not increase ejection force beyond the capacity of your existing injection molding machine’s ejection system, as higher ejection force will increase cycle time and lead to higher risk of part deformation during ejection. For the upcoming production run, arrange to run the mold on a machine with a more consistent temperature control system to reduce dimensional variation caused by uneven cooling across cavities, which can reduce scrap by an additional 3% to 5% without requiring mold changes.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-5", "datePublished": "2026-09-26T06:49:14Z", "author": {"@type": "Person","name": "Eric Zhao","url": "https://www.ok-tool.com/team/eric.html"} } , { "@type": "Answer", "text": "Evaluate the tolerance stack-up between your plastic fastening cap and the matching metal stud to identify if the standard mold’s tolerance range is compatible with your existing component supply chain. The total allowed tolerance for the assembly is the sum of the metal stud’s outer thread tolerance, the plastic cap’s inner thread tolerance, and the tolerance from post-molding shrinkage and temperature expansion. If your metal stud supplier has tightened their thread tolerance in the last 6 months without notification, the standard mold’s original tolerance range will no longer be compatible, even if it worked for previous production runs. Adjust your mold’s thread dimension to account for the updated metal stud tolerance, and implement a pre-production assembly test with 100 units of both components to verify fit before full production, to avoid batch scrap caused by mismatched component tolerances.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-6", "datePublished": "2026-09-26T06:37:40Z", "author": {"@type": "Person","name": "Rachel Huang","url": "https://www.ok-tool.com/team/rachel.html"} } , { "@type": "Answer", "text": "Map all corrective actions to your 7-day pre-production timeline and 3-week delivery deadline to prioritize actions that deliver the fastest improvement with minimal risk. First, allocate 2 days for mold inspection and short shot testing, 1 day for any minor temporary adjustments like vent cuts or PTFE coating, and 1 day for a 500-unit trial run to validate improvement, leaving 3 days as buffer for any unexpected issues. If permanent mold modifications are required that take longer than 7 days, negotiate a split delivery with your customer to ship 60k units produced with the temporarily adjusted mold first, while the permanent modification is completed for the remaining 60k units. Ensure that all mold adjustments are documented and signed off by both your quality and engineering teams before implementation, and update your standard mold procurement SOP to require pre-production validation runs for all new mold sets going forward to avoid similar delays in future projects.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-7", "datePublished": "2026-09-26T06:36:03Z", "author": {"@type": "Person","name": "Linda Xu","url": "https://www.ok-tool.com/team/linda.html"} } , { "@type": "Answer", "text": "Evaluate the standard mold’s gate location and cavity layout to identify design choices that contribute to your defect issues. Most standard fastening injection molds use a side gate located on the outer edge of the cap head, which leads to uneven material flow towards the thread section at the bottom of the part, causing uneven shrinkage that leads to pitch deviation and sink marks. If the gate size is larger than 1.2mm for PA66 processing, it can also lead to higher residual stress in the part, which increases post-molding shrinkage variation across cavities. For minor adjustments, you can reduce the gate size by 0.2mm to improve flow balance and reduce residual stress, which can reduce dimensional deviation by up to 40% without requiring changes to the cavity structure. If you plan to use the mold for long-term production, consider relocating the gate to the center of the cap head to improve flow balance across the entire part.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-8", "datePublished": "2026-09-26T06:32:47Z", "author": {"@type": "Person","name": "David Zhang","url": "https://www.ok-tool.com/team/david.html"} } , { "@type": "Answer", "text": "Implement a structured yield improvement workflow for the standard fastening mold to deliver both short-term fixes for your urgent order and long-term sustainable quality gains. For the short term, use a Pareto analysis to focus on the top two defects (flash and thread pitch deviation) that account for 90% of your scrap, and track the impact of each adjustment on defect rate to avoid wasting time on low-impact changes. For the long term, use 5S methodology to standardize mold storage, pre-production inspection, and parameter setup processes to reduce variation between production runs. Implement a preventive maintenance schedule for the mold that includes cleaning vents and checking parting line gaps every 50k production cycles, to prevent defect rates from increasing as the mold wears during use. You can also collect shrinkage data across 10 production runs to create a material-specific shrinkage adjustment table for standard molds, to reduce validation time for future mold purchases.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/key-quality-checks-standard-injection-molds-fastening-applications.html#suggestedAnswer-9", "datePublished": "2026-09-26T06:10:11Z", "author": {"@type": "Person","name": "Kevin Liu","url": "https://www.ok-tool.com/team/kevin.html"} } ] } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ {"@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.ok-tool.com/"},{"@type": "ListItem", "position": 2, "name": "Q&A", "item": "https://www.ok-tool.com/qa/"},{"@type": "ListItem", "position": 3, "name": "Injection Molding Q&A >", "item": "https://www.ok-tool.com/qa/injection-molding/>"} ,{"@type": "ListItem", "position": 4, "name": "What Are Key Quality Checks for Standard Injection Molds for Fastening Applications?"} ] } ] ```