--- title: "How does indexing design affect plastic enclosure injection molding yield and assembly fit?" description: "Facing indexing misalignment, poor weld fit and low trial yield during plastic enclosure pre-production validation? Targeted optimization of indexing design, tolerance control and injection parameters reduces rework, lifts mass production yield and ensures stable assembly consistency." url: "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html" language: "en" type: "Q&A" category: "Injection Molding Q&A" datePublished: "2026-09-12" dateModified: "2026-09-12" brand: "OK TOOL" manufacturer: "OK TOOL" answerCount: 8 --- # How does indexing design affect plastic enclosure injection molding yield and assembly fit? ## Question I’m leading T1 trial validation for a new handheld consumer electronics device’s plastic enclosure, made of ABS+PC blend with 2.5mm uniform wall thickness, and I’ve hit a critical indexing issue that’s putting our timeline at risk. The upper and lower shells use 4 pairs of cylindrical indexing posts and matching holes on the mating flange, designed to ensure precise alignment before ultrasonic welding. Our spec requires maximum 0.08mm weld seam gap around the full perimeter, but 32% of T1 samples show 0.15–0.25mm indexing misalignment, leading to uneven weld gaps up to 0.22mm on one side. Our process team adjusted clamping force by 15% and tuned injection hold pressure to reduce shrinkage, but only brought the defect rate down to 21%, still far from our T2 target of under 3%. We have T2 trial scheduled in 10 days and mass production launch in 6 weeks; full mold rework that takes more than 5 days is off the table due to timeline constraints. I need clarity on the most likely root causes of this indexing misalignment, immediate low-effort fixes we can implement for T2, and long-term process and design controls to keep mass production defect rate below 0.5% without major tooling changes. ## Answers ### Answer 1 — Best Answer The core distinction between indexing misalignment causes for plastic enclosures falls into three non-overlapping categories: design tolerance stack, mold manufacturing deviation, and process-induced shrinkage variation. Design-related misalignment stems from unaccounted cumulative tolerance between indexing features (posts, holes, ribs) and the primary mating datum, even when all individual features meet their individual specs. Mold-related misalignment comes from positional deviation of index pin inserts, core/cavity misalignment during tooling assembly, or uneven wear on guiding components, and remains consistent across production runs regardless of parameter changes. Process-related misalignment is driven by uneven material shrinkage across the part flange, mold deflection under high clamping force, or unbalanced filling that shifts part geometry relative to the indexing features, and varies with injection parameter adjustments. Each root cause category maps to specific diagnostic scenarios. Design-related misalignment is confirmed when misalignment direction and magnitude are consistent across all cavities and all process parameter sets, and matches the calculated tolerance stack from the 2D/3D drawing. Mold-related misalignment is identified when deviation is consistent per cavity, does not shift with hold pressure or cooling adjustments, and matches direct dimensional measurements of the mold’s index pin positions relative to the parting line datum. Process-related misalignment is the root cause when deviation varies shot-to-shot, improves or worsens with hold pressure/clamping force changes, and is more severe on the side of the part farthest from the main gate. For the scenario described, partial improvement from process tuning indicates a combined root cause: marginal mold index pin positional tolerance (within print but at the upper limit) amplified by uneven flange shrinkage, with minor tolerance stack contributing to the final gap. For immediate T2 trial fixes that fit within the 10-day timeline, start with a full mold dimensional verification of all index pin/hole positions and diameters, completed within 2 working days, to quantify baseline tooling deviation. If pin position deviation is under 0.05mm (within standard mold tolerance), use shim adjustments on the index pin inserts on the side with consistent misalignment to add a 0.03–0.05mm offset; this adjustment takes 3 days and avoids full cavity rework. Pair this with cooling circuit tuning: raise cooling water temperature by 4–6°C on the side of the flange with higher measured shrinkage to reduce differential shrinkage, which typically cuts misalignment by 0.08–0.12mm without any tooling modifications. **For T2 pass criteria, target a maximum 0.06mm indexing misalignment across all samples, to leave buffer for normal process variation in mass production.** For long-term mass production control to keep defect rates below 0.5%, implement two layered controls. First, add a first-article indexing dimensional check at the start of every production shift, with positional tolerance of index features measured against the mating datum as a mandatory pass/fail check before full production runs. Second, implement a minor design tweak that requires only 4 days of mold work: add a 0.1mm × 45° lead-in chamfer to both indexing posts and matching holes, which compensates for minor process variation during assembly and reduces misalignment-related defects by roughly 65% compared to sharp-edged indexing features. **For future enclosure designs, tie all indexing features directly to the primary mating surface datum in the GD&T scheme, instead of referencing separate cavity or core features, to eliminate tolerance stack as a contributing factor.** **status:** accepted **Author:** Eric Zhao **Date:** 2026-09-12 ### Answer 2 Indexing feature misalignment often traces back to gate location choices made during initial tooling design, even when the gate seems far from the flange indexing features. For enclosures with flange indexing posts, if the main gate is placed on the side wall opposite the indexing pair with the highest misalignment, uneven flow front velocity creates differential shrinkage across the flange that pulls the indexing features out of position. For the current tool, if moving the gate is not feasible, adding a secondary tab gate on the flange side with higher shrinkage can balance fill, though this requires adding a small gate vestige that will need secondary trimming if cosmetic requirements are strict. For future tool designs, place gates symmetrically along the centerline of the enclosure flange to ensure uniform flow and shrinkage across all indexing feature locations, and design index pins as separate insert components rather than machined directly into the core, to allow quick shim adjustments without reworking the entire core plate. **status:** suggested **Author:** Emily Chen **Date:** 2026-09-12 ### Answer 3 When evaluating indexing misalignment, it is critical to separate molding deviation from assembly tolerance stack that amplifies small molding errors into visible weld gaps. For ultrasonic welding of upper and lower enclosures, the indexing features are not the only datum: the welding fixture also uses its own alignment pins that reference the outer edge of the enclosure, so misalignment between the fixture datum and the part indexing datum can make a 0.08mm molding deviation look like a 0.2mm weld gap. For the T2 trial, run a cross-check: measure indexing feature position relative to the outer enclosure edge first, then test assembly on the welding fixture with parts that have known indexing deviation to quantify how much of the final gap comes from fixture mismatch. For volume production, add a go/no-go gauge for indexing feature alignment that matches the welding fixture datum, to catch parts that pass individual feature specs but will fail assembly before they reach the welding line. **status:** suggested **Author:** Jason Zhou **Date:** 2026-09-12 ### Answer 4 Index pin wear is an often overlooked factor that causes increasing misalignment as the mold accumulates production shots, even if initial T1 samples are within spec. For ABS+PC enclosures, index pins made of standard P20 steel will show 0.03–0.05mm of wear after 50,000 shots, which is enough to push misalignment past the acceptable threshold when combined with normal process variation. For the current tool, if the index pins are made of P20, upgrading them to H13 steel with a TiN coating will reduce wear rate by 80% and extend the time between maintenance adjustments from 50,000 to 250,000 shots. For the immediate T2 adjustment, use ground precision shims instead of hand-fitted shims for index pin offset, as ground shims hold their dimension through repeated clamping cycles and avoid gradual shift that leads to inconsistent misalignment across runs. Schedule a mandatory index pin dimensional check every 30,000 shots during mass production to catch wear before it causes defects. **status:** suggested **Author:** Amy Li **Date:** 2026-09-12 ### Answer 5 Indexing misalignment does not just cause cosmetic weld gaps; it can also impact long-term functional performance of the enclosure, especially for handheld devices that face drop impact and moisture ingress requirements. Even if the weld gap is within cosmetic spec, misaligned indexing posts can create uneven weld joint strength, with the tight side of the gap having full weld penetration and the loose side having partial penetration that fails drop tests. For the T2 trial, add drop test validation for samples that have the maximum acceptable indexing misalignment (0.06mm) to confirm that weld strength meets IK07 drop requirements, rather than only checking cosmetic gap. For devices with IP rating requirements, misaligned indexing can also create gaps in the seal groove that lead to ingress failure, so include IPX7 water immersion testing for borderline samples as part of T2 sign-off. Prioritize fixes that align the seal groove datum with indexing features to avoid hidden functional failures that only appear in field testing. **status:** suggested **Author:** David Zhang **Date:** 2026-09-12 ### Answer 6 Indexing feature design directly impacts assembly line efficiency and automation compatibility, especially for high-volume production runs that use robotic parts feeding and welding. Indexing posts without lead-in chamfers require precise robotic pick-and-place positioning, which slows cycle time by 15–20% as robots adjust to align the parts, and increases the risk of assembly jams that stop the line. For the current design, adding the 0.1mm lead-in chamfer to indexing posts and holes will reduce robotic assembly cycle time by roughly 18% and cut jam-related downtime by 70%, which offsets the small cost of the mold modification within the first 100,000 units of mass production. For production line setup, use vision systems at the assembly infeed to check indexing feature alignment before parts reach the welding station, which prevents misaligned parts from jamming the line and reduces rework time. The vision check can be integrated into existing infeed sensors without adding significant cycle time. **status:** suggested **Author:** Olivia Chen **Date:** 2026-09-12 ### Answer 7 Indexing misalignment is often a hidden bottleneck for overall injection molding yield, as it is not caught until the assembly stage, leading to wasted value from secondary operations and assembled parts that need to be scrapped. For the current production flow, implement a poka-yoke check at the end of the injection molding cycle, using a simple contact gauge mounted on the ejector plate that checks indexing pin position before parts are removed from the mold, which catches misaligned parts immediately and avoids sending bad parts to assembly. For long-term yield improvement, run a full DOE (design of experiments) during T2 trial that tests combinations of hold pressure, cooling time, and mold temperature across all cavities, to identify the parameter window that keeps indexing misalignment under 0.05mm for 99% of shots. Use SPC (statistical process control) tracking for indexing feature dimensions, with control limits set at 80% of the tolerance threshold, to trigger process adjustments before parts go out of spec and reduce scrap rate by more than 90% compared to reactive defect handling. **status:** suggested **Author:** Rachel Huang **Date:** 2026-09-12 ### Answer 8 Indexing-related changes during the T1 to T2 transition need strict change control to avoid cascading delays to the mass production launch timeline, especially when multiple teams are pushing for design or tooling adjustments. For the current timeline, categorize proposed fixes into three buckets: no-tooling changes (cooling tuning, process adjustments) that can be implemented within 3 days with no impact to T2 schedule, minor tooling changes (shim adjustments, index pin chamfer) that take 4–5 days and require formal change request sign-off from both engineering and quality teams, and major tooling changes (gate relocation, core rework) that would delay T2 by more than 7 days and require a formal timeline risk assessment. Before T2 sign-off, secure written approval for all indexing-related spec adjustments from the end customer’s quality team, to avoid disputes during mass production PPAP submission. Build a 2-day buffer into the T2 timeline for minor tooling tweaks, to avoid pushing the mass production launch date if initial T2 samples do not meet the misalignment target. **status:** suggested **Author:** Linda Xu **Date:** 2026-09-12 ## 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": "How does indexing design affect plastic enclosure injection molding yield and assembly fit?", "text": "I’m leading T1 trial validation for a new handheld consumer electronics device’s plastic enclosure, made of ABS+PC blend with 2.5mm uniform wall thickness, and I’ve hit a critical indexing issue that’s putting our timeline at risk. The upper and lower shells use 4 pairs of cylindrical indexing posts and matching holes on the mating flange, designed to ensure precise alignment before ultrasonic welding. Our spec requires maximum 0.08mm weld seam gap around the full perimeter, but 32% of T1 samples show 0.15–0.25mm indexing misalignment, leading to uneven weld gaps up to 0.22mm on one side. Our process team adjusted clamping force by 15% and tuned injection hold pressure to reduce shrinkage, but only brought the defect rate down to 21%, still far from our T2 target of under 3%. We have T2 trial scheduled in 10 days and mass production launch in 6 weeks; full mold rework that takes more than 5 days is off the table due to timeline constraints. I need clarity on the most likely root causes of this indexing misalignment, immediate low-effort fixes we can implement for T2, and long-term process and design controls to keep mass production defect rate below 0.5% without major tooling changes.", "answerCount": 8, "upvoteCount": 6, "datePublished": "2026-09-12T20:07:28Z", "dateModified": "2026-09-12T20:09:03Z", "author": { "@type": "Person", "name": "Anonymous", "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html" } ,"acceptedAnswer": { "@type": "Answer", "text": "The core distinction between indexing misalignment causes for plastic enclosures falls into three non-overlapping categories: design tolerance stack, mold manufacturing deviation, and process-induced shrinkage variation. Design-related misalignment stems from unaccounted cumulative tolerance between indexing features (posts, holes, ribs) and the primary mating datum, even when all individual features meet their individual specs. Mold-related misalignment comes from positional deviation of index pin inserts, core/cavity misalignment during tooling assembly, or uneven wear on guiding components, and remains consistent across production runs regardless of parameter changes. Process-related misalignment is driven by uneven material shrinkage across the part flange, mold deflection under high clamping force, or unbalanced filling that shifts part geometry relative to the indexing features, and varies with injection parameter adjustments. Each root cause category maps to specific diagnostic scenarios. Design-related misalignment is confirmed when misalignment direction and magnitude are consistent across all cavities and all process parameter sets, and matches the calculated tolerance stack from the 2D/3D drawing. Mold-related misalignment is identified when deviation is consistent per cavity, does not shift with hold pressure or cooling adjustments, and matches direct dimensional measurements of the mold’s index pin positions relative to the parting line datum. Process-related misalignment is the root cause when deviation varies shot-to-shot, improves or worsens with hold pressure/clamping force changes, and is more severe on the side of the part farthest from the main gate. For the scenario described, partial improvement from process tuning indicates a combined root cause: marginal mold index pin positional tolerance (within print but at the upper limit) amplified by uneven flange shrinkage, with minor tolerance stack contributing to the final gap. For immediate T2 trial fixes that fit within the 10-day timeline, start with a full mold dimensional verification of all index pin/hole positions and diameters, completed within 2 working days, to quantify baseline tooling deviation. If pin position deviation is under 0.05mm (within standard mold tolerance), use shim adjustments on the index pin inserts on the side with consistent misalignment to add a 0.03–0.05mm offset; this adjustment takes 3 days and avoids full cavity rework. Pair this with cooling circuit tuning: raise cooling water temperature by 4–6°C on the side of the flange with higher measured shrinkage to reduce differential shrinkage, which typically cuts misalignment by 0.08–0.12mm without any tooling modifications. For T2 pass criteria, target a maximum 0.06mm indexing misalignment across all samples, to leave buffer for normal process variation in mass production. For long-term mass production control to keep defect rates below 0.5%, implement two layered controls. First, add a first-article indexing dimensional check at the start of every production shift, with positional tolerance of index features measured against the mating datum as a mandatory pass/fail check before full production runs. Second, implement a minor design tweak that requires only 4 days of mold work: add a 0.1mm × 45° lead-in chamfer to both indexing posts and matching holes, which compensates for minor process variation during assembly and reduces misalignment-related defects by roughly 65% compared to sharp-edged indexing features. For future enclosure designs, tie all indexing features directly to the primary mating surface datum in the GD&T scheme, instead of referencing separate cavity or core features, to eliminate tolerance stack as a contributing factor.", "upvoteCount": 6, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#acceptedAnswer", "datePublished": "2026-09-12T20:49:12Z", "author": {"@type": "Person","name": "Eric Zhao","url": "https://www.ok-tool.com/team/eric.html"} } ,"suggestedAnswer": [ { "@type": "Answer", "text": "Indexing feature misalignment often traces back to gate location choices made during initial tooling design, even when the gate seems far from the flange indexing features. For enclosures with flange indexing posts, if the main gate is placed on the side wall opposite the indexing pair with the highest misalignment, uneven flow front velocity creates differential shrinkage across the flange that pulls the indexing features out of position. For the current tool, if moving the gate is not feasible, adding a secondary tab gate on the flange side with higher shrinkage can balance fill, though this requires adding a small gate vestige that will need secondary trimming if cosmetic requirements are strict. For future tool designs, place gates symmetrically along the centerline of the enclosure flange to ensure uniform flow and shrinkage across all indexing feature locations, and design index pins as separate insert components rather than machined directly into the core, to allow quick shim adjustments without reworking the entire core plate.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-2", "datePublished": "2026-09-12T20:39:37Z", "author": {"@type": "Person","name": "Emily Chen","url": "https://www.ok-tool.com/team/emily.html"} } , { "@type": "Answer", "text": "When evaluating indexing misalignment, it is critical to separate molding deviation from assembly tolerance stack that amplifies small molding errors into visible weld gaps. For ultrasonic welding of upper and lower enclosures, the indexing features are not the only datum: the welding fixture also uses its own alignment pins that reference the outer edge of the enclosure, so misalignment between the fixture datum and the part indexing datum can make a 0.08mm molding deviation look like a 0.2mm weld gap. For the T2 trial, run a cross-check: measure indexing feature position relative to the outer enclosure edge first, then test assembly on the welding fixture with parts that have known indexing deviation to quantify how much of the final gap comes from fixture mismatch. For volume production, add a go/no-go gauge for indexing feature alignment that matches the welding fixture datum, to catch parts that pass individual feature specs but will fail assembly before they reach the welding line.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-3", "datePublished": "2026-09-12T20:39:21Z", "author": {"@type": "Person","name": "Jason Zhou","url": "https://www.ok-tool.com/team/jason.html"} } , { "@type": "Answer", "text": "Index pin wear is an often overlooked factor that causes increasing misalignment as the mold accumulates production shots, even if initial T1 samples are within spec. For ABS+PC enclosures, index pins made of standard P20 steel will show 0.03–0.05mm of wear after 50,000 shots, which is enough to push misalignment past the acceptable threshold when combined with normal process variation. For the current tool, if the index pins are made of P20, upgrading them to H13 steel with a TiN coating will reduce wear rate by 80% and extend the time between maintenance adjustments from 50,000 to 250,000 shots. For the immediate T2 adjustment, use ground precision shims instead of hand-fitted shims for index pin offset, as ground shims hold their dimension through repeated clamping cycles and avoid gradual shift that leads to inconsistent misalignment across runs. Schedule a mandatory index pin dimensional check every 30,000 shots during mass production to catch wear before it causes defects.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-4", "datePublished": "2026-09-12T20:34:35Z", "author": {"@type": "Person","name": "Amy Li","url": "https://www.ok-tool.com/team/amy.html"} } , { "@type": "Answer", "text": "Indexing misalignment does not just cause cosmetic weld gaps; it can also impact long-term functional performance of the enclosure, especially for handheld devices that face drop impact and moisture ingress requirements. Even if the weld gap is within cosmetic spec, misaligned indexing posts can create uneven weld joint strength, with the tight side of the gap having full weld penetration and the loose side having partial penetration that fails drop tests. For the T2 trial, add drop test validation for samples that have the maximum acceptable indexing misalignment (0.06mm) to confirm that weld strength meets IK07 drop requirements, rather than only checking cosmetic gap. For devices with IP rating requirements, misaligned indexing can also create gaps in the seal groove that lead to ingress failure, so include IPX7 water immersion testing for borderline samples as part of T2 sign-off. Prioritize fixes that align the seal groove datum with indexing features to avoid hidden functional failures that only appear in field testing.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-5", "datePublished": "2026-09-12T20:33:26Z", "author": {"@type": "Person","name": "David Zhang","url": "https://www.ok-tool.com/team/david.html"} } , { "@type": "Answer", "text": "Indexing feature design directly impacts assembly line efficiency and automation compatibility, especially for high-volume production runs that use robotic parts feeding and welding. Indexing posts without lead-in chamfers require precise robotic pick-and-place positioning, which slows cycle time by 15–20% as robots adjust to align the parts, and increases the risk of assembly jams that stop the line. For the current design, adding the 0.1mm lead-in chamfer to indexing posts and holes will reduce robotic assembly cycle time by roughly 18% and cut jam-related downtime by 70%, which offsets the small cost of the mold modification within the first 100,000 units of mass production. For production line setup, use vision systems at the assembly infeed to check indexing feature alignment before parts reach the welding station, which prevents misaligned parts from jamming the line and reduces rework time. The vision check can be integrated into existing infeed sensors without adding significant cycle time.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-6", "datePublished": "2026-09-12T20:25:26Z", "author": {"@type": "Person","name": "Olivia Chen","url": "https://www.ok-tool.com/team/olivia.html"} } , { "@type": "Answer", "text": "Indexing misalignment is often a hidden bottleneck for overall injection molding yield, as it is not caught until the assembly stage, leading to wasted value from secondary operations and assembled parts that need to be scrapped. For the current production flow, implement a poka-yoke check at the end of the injection molding cycle, using a simple contact gauge mounted on the ejector plate that checks indexing pin position before parts are removed from the mold, which catches misaligned parts immediately and avoids sending bad parts to assembly. For long-term yield improvement, run a full DOE (design of experiments) during T2 trial that tests combinations of hold pressure, cooling time, and mold temperature across all cavities, to identify the parameter window that keeps indexing misalignment under 0.05mm for 99% of shots. Use SPC (statistical process control) tracking for indexing feature dimensions, with control limits set at 80% of the tolerance threshold, to trigger process adjustments before parts go out of spec and reduce scrap rate by more than 90% compared to reactive defect handling.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-7", "datePublished": "2026-09-12T20:23:31Z", "author": {"@type": "Person","name": "Rachel Huang","url": "https://www.ok-tool.com/team/rachel.html"} } , { "@type": "Answer", "text": "Indexing-related changes during the T1 to T2 transition need strict change control to avoid cascading delays to the mass production launch timeline, especially when multiple teams are pushing for design or tooling adjustments. For the current timeline, categorize proposed fixes into three buckets: no-tooling changes (cooling tuning, process adjustments) that can be implemented within 3 days with no impact to T2 schedule, minor tooling changes (shim adjustments, index pin chamfer) that take 4–5 days and require formal change request sign-off from both engineering and quality teams, and major tooling changes (gate relocation, core rework) that would delay T2 by more than 7 days and require a formal timeline risk assessment. Before T2 sign-off, secure written approval for all indexing-related spec adjustments from the end customer’s quality team, to avoid disputes during mass production PPAP submission. Build a 2-day buffer into the T2 timeline for minor tooling tweaks, to avoid pushing the mass production launch date if initial T2 samples do not meet the misalignment target.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/indexing-design-plastic-enclosure-injection-molding-yield-assembly-fit.html#suggestedAnswer-8", "datePublished": "2026-09-12T20:09:03Z", "author": {"@type": "Person","name": "Linda Xu","url": "https://www.ok-tool.com/team/linda.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": "How does indexing design affect plastic enclosure injection molding yield and assembly fit?"} ] } ] ```