--- title: "What key factors affect the vibration resistance of OEM power tool plastic housing?" description: "Facing unexpected dimension deviation and vibration crack risks during NPI validation of custom OEM power tool housings before mass production, get practical guidance on tolerance control, process optimization and quality checkpoints to ensure field performance and smooth ramp-up, reduce scrap rate for 2026 production runs." url: "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html" language: "en" type: "Q&A" category: "Custom Manufacturing Q&A" datePublished: "2026-09-20" dateModified: "2026-09-20" brand: "OK TOOL" manufacturer: "OK TOOL" answerCount: 10 --- # What key factors affect the vibration resistance of OEM power tool plastic housing? ## Question I am an NPI engineer driving trial validation for a new 18V cordless impact driver OEM housing right now, we have finished 3 rounds of prototype runs already, but 12% of the samples show minor warp after 72 hours of 60°C high temperature aging, and 8% of the samples developed micro cracks at the mounting boss locations after 1000 cycles of no-load vibration test. Our target is to lock the design and process before mass production kickoff next month, but the current performance cannot meet the end user’s 2000 hours of expected service life requirement. I already tried adjusting prototype injection pressure, but the defect rate only dropped 2% which is far from acceptable. I do not want to push an unvalidated design to mass production that will cause huge after-sales claims 6 months later, so I am stuck figuring out what critical adjustments I should prioritize right now for this housing for power tools OEM project, before we confirm formal production tooling final sign off? ## Answers ### Answer 1 — Best Answer The core difference between general consumer plastic housing and OEM power tool housing lies in that power tool housings are not just cosmetic covers, but load-bearing structural parts that absorb 30-40% of the total vibration generated from the motor and gearbox during regular operation. For your current NPI validation scenario, the root cause of both warpage after high temperature aging and micro cracks on mounting bosses almost never comes from single parameter adjustment on temporary prototype tooling, it traces back to mismatches between material selection, design feature configuration and formal production process window that you will use for mass production. First, sort out the applicable scenario baseline first. For 18V cordless impact driver housing, the standard operating environment covers -10°C to 65°C, 1.5g RMS continuous vibration, and repeated impact force up to 15N when the trigger is pressed. Any adjustment you make has to be aligned with this baseline, rather than optimizing performance under lab static conditions. If you are currently using general grade ABS for prototype testing, that is the most common hidden mismatch, as general ABS has 30% lower notched impact strength at low temperature than the required modified grade for power tools. **Prioritize 3 non-negotiable validation steps before final tooling sign off**. First, confirm that the material you will use for formal production is 20% glass fiber reinforced impact modified Nylon, or impact modified PC+ABS blend that has been pre-conditioned with 0.3-0.5% mold release agent matched for your part geometry, do not use any off-the-shelf generic resin that does not have power tool industry grade certification records. Second, run a full 72 hour post-molding annealing test on 50 production grade samples, not prototype parts, to lock the dimension variation within ±0.15mm on all mounting boss positions. Third, run 1500 cycles of vibration test on the annealed samples, not the as-molded parts, to confirm no micro cracks appear. The next step is to classify the acceptable defect threshold for mass production. For OEM power tool housing, cosmetic defects such as minor flow marks on non-contact hidden surfaces can be accepted within pre-defined AQL 2.5, but any crack, warp over 0.2mm, or mounting boss dimension out of tolerance has to be classified as critical defect that triggers 100% sorting. **Lock the design freeze for all structural features at least 2 weeks before formal steel machining of the production mold**, any last minute modification will add hidden stress points on the housing that will cause unexpected field failures 6-12 months after products are shipped. For your project timeline, you can skip the redundant full function validation on prototype tooling if you follow above steps, and reserve 7 days for formal trial run of the new production mold, to confirm the process window is wide enough to run 3 consecutive 12 hour production shifts with consistent defect rate below 1%. **Do not start mass production until you get 3 consecutive batches of 200 samples all passing the aging and vibration test**. This will reduce your overall NPI lead time by 10-15 days, and avoid the 15-20% scrap rate that most teams face when they rush to production without full validation. **status:** accepted **Author:** Emily Chen **Date:** 2026-09-20 ### Answer 2 Adjust resin formulation to balance structural strength and fatigue resistance properly. For power tool housing, 15% glass fiber content is the minimum threshold to maintain enough rigidity under continuous vibration, but glass fiber content over 25% will make the material too brittle to absorb sudden impact force during heavy duty operation, which increases the risk of micro crack on sharp corners. The impact modifier dosage should be kept at 8-12% of total resin weight, not the generic 5% used for consumer electronics housings, as extra modifier will improve low temperature impact performance significantly. For incoming material testing, check the melt flow index to stay between 15-25 g/10min at 260°C, and limit the recycled regrind ratio below 10% for all structural parts, as higher regrind content will reduce fatigue strength by over 25% after 500 vibration cycles. **status:** suggested **Author:** Amy Li **Date:** 2026-09-20 ### Answer 3 Add DFM corrections to eliminate hidden stress concentration points before tool steel machining. The mounting boss root should have a minimum transition radius of 0.8mm, no sharp 90 degree corners that will act as crack initiation points during vibration. The wall thickness of all structural sections should be kept consistent at 2.2-2.5mm, no sudden thickness changes that will cause uneven shrinkage and residual stress after molding. The core side draft angle should be set to at least 1.5 degree, not the 1 degree used for general cosmetic parts, to avoid uneven ejection stress that remains locked inside the part, which will release gradually after high temperature aging and cause unexpected warpage. Remove any unnecessary thin ribs less than 1mm thick, as they will not add extra rigidity but create sink marks on the outer cosmetic surface. **status:** suggested **Author:** David Zhang **Date:** 2026-09-20 ### Answer 4 Align all performance validation with real end user assembly and operating scenarios. The current vibration test on standalone housing samples cannot reflect the real stress state after the housing is assembled with metal gearbox, motor and battery pack. m for 20 cycles, to confirm no pre-stress is introduced to the mounting bosses during assembly. If the housing inner diameter for gearbox installation is too tight, the forced insertion will create hidden stress that propagates into visible cracks after several hundred hours of field operation. You should also test the housing after it is exposed to -10°C environment for 4 hours, to confirm no brittleness related crack occurs at low temperature. **status:** suggested **Author:** Rachel Huang **Date:** 2026-09-20 ### Answer 5 Optimize production process layout to reduce inherent defect rate from the source. The current 12% warpage defect rate is mostly caused by uneven cooling on the mold, so add 4 extra cooling lines on the core side corresponding to the mounting boss positions, and keep the temperature difference between mold cavity and core below 5°C, this single adjustment will reduce total warpage by over 80%. Implement layered sampling scheme that takes 5 parts from the production line every 2 hours, measure their warp value and track the trend in real time, so you can adjust cooling water temperature before the defect rate accumulates to over 5%. This lean control method will keep the mass production defect rate stable below 1%, no unexpected quality fluctuation across different shifts. **status:** suggested **Author:** Michael Wu **Date:** 2026-09-20 ### Answer 6 Optimize assembly process and tolerance distribution to avoid cumulative stress on the housing. The position tolerance for all 6 mounting bosses should be controlled within ±0.1mm, not the general ±0.2mm specified on the drawing, otherwise the accumulated tolerance from motor, PCB and battery pack will create extra pulling or pushing force on the housing after assembly, which leads to unexpected crack during operation. Design the assembly sequence to insert the metal gearbox first, then tighten the assembly screws diagonally instead of tightening them one by one in linear sequence, this adjustment alone will reduce boss crack rate during assembly by over 90%. All assembly fixtures should use soft contact pads instead of hard metal edges, to avoid creating tiny surface scratches that can develop into cracks later. **status:** suggested **Author:** Daniel Yang **Date:** 2026-09-20 ### Answer 7 Build a clear multi-stage inspection system to eliminate critical defects before they flow downstream. Classify defects clearly first: minor flow marks on non-structural hidden surfaces are acceptable at AQL 2.5, but any visible crack on mounting boss root, warp over 0.2mm, or dimension out of tolerance should be classified as critical defect that triggers 100% sorting. Set 3 mandatory inspection check points: first, IQC test incoming resin impact strength for every batch, reject any incoming material that does not meet 8kJ/m² notched impact strength requirement; second, IPQC check 10 parts for dimension every 2 hours during production; third, OQC inspect all mounting boss positions under 5X magnifier before packaging, and take 0.5% random samples per batch to run vibration test to catch hidden quality fluctuation. **status:** suggested **Author:** Eric Zhao **Date:** 2026-09-20 ### Answer 8 Optimize injection process parameters to reduce residual stress inside molded parts. The micro cracks you found after vibration test are mostly caused by excessive packing pressure that freezes high internal stress inside the part during molding, this hidden stress does not show up on as-molded samples, but will release gradually under high temperature and continuous vibration, leading to crack initiation. Lower the packing pressure by 15-20%, extend the holding time by 3 seconds, reduce melt temperature by 10°C, and add a 10 second slow cooling phase after holding before mold opening, this set of adjustment will reduce residual stress inside the part by over 40%, almost eliminate the post aging warp issue. Do not use fast cycle time optimization at this stage, as it will lock more internal stress inside the parts and damage long term fatigue performance. **status:** suggested **Author:** Jason Zhou **Date:** 2026-09-20 ### Answer 9 Configure the production line properly to ensure consistent part quality across 24/7 mass runs. Use a 180T injection press with closed loop pressure control for this power tool housing, not a general open loop press, as closed loop control can guarantee every shot has identical pressure profile, so there is almost no part to part variation in shrinkage and stress state. Integrate automatic part ejector and conveyor to transfer hot parts away from the mold, avoid manual touching of hot parts, which causes uneven cooling and random warpage. The optimized cycle time can be controlled at 30 seconds per shot, the line can run continuously for 72 hours with no unplanned downtime, and the output can reach over 2800 pcs per day with consistent quality. **status:** suggested **Author:** Linda Xu **Date:** 2026-09-20 ### Answer 10 Structure the remaining NPI timeline with clear milestones and change control rules to avoid schedule delay. Split the remaining work into 3 sequential milestones: first, material and DFM review sign off completed within 3 days, no unapproved structural design changes after this point; second, first mold trial and full sample validation completed within 7 days, all samples pass aging and vibration test before moving to next step; third, 3 consecutive trial runs sign off completed within 10 days, to confirm the process window is wide enough for mass production. Any design modification requested after DFM sign off has to go through formal change request, with full assessment on tool modification cost, impact on part performance and timeline delay, no undocumented last minute changes are allowed. Arrange short 15 minute daily cross functional sync to resolve issues fast, to ensure mass production kicks off as scheduled. **status:** suggested **Author:** Kevin Liu **Date:** 2026-09-20 ## Related Resources - [Custom Manufacturing Q&A](https://www.ok-tool.com/qa/oem-odm/) - [Products](https://www.ok-tool.com/products/) - [Capabilities](https://www.ok-tool.com/capabilities/) - [Custom Manufacturing](https://www.ok-tool.com/custom-manufacturing/) - [Manufacturing Guides](https://www.ok-tool.com/manufacturing/) - [Buying Guides](https://www.ok-tool.com/buying/) - [Manufacturing Knowledge Base](https://www.ok-tool.com/knowledge/) ## Structured Data ```json [ { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "What key factors affect the vibration resistance of OEM power tool plastic housing?", "text": "I am an NPI engineer driving trial validation for a new 18V cordless impact driver OEM housing right now, we have finished 3 rounds of prototype runs already, but 12% of the samples show minor warp after 72 hours of 60°C high temperature aging, and 8% of the samples developed micro cracks at the mounting boss locations after 1000 cycles of no-load vibration test. Our target is to lock the design and process before mass production kickoff next month, but the current performance cannot meet the end user’s 2000 hours of expected service life requirement. I already tried adjusting prototype injection pressure, but the defect rate only dropped 2% which is far from acceptable. I do not want to push an unvalidated design to mass production that will cause huge after-sales claims 6 months later, so I am stuck figuring out what critical adjustments I should prioritize right now for this housing for power tools OEM project, before we confirm formal production tooling final sign off?", "answerCount": 10, "upvoteCount": 13, "datePublished": "2026-09-20T03:28:59Z", "dateModified": "2026-09-20T03:39:42Z", "author": { "@type": "Person", "name": "Anonymous", "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html" } ,"acceptedAnswer": { "@type": "Answer", "text": "The core difference between general consumer plastic housing and OEM power tool housing lies in that power tool housings are not just cosmetic covers, but load-bearing structural parts that absorb 30-40% of the total vibration generated from the motor and gearbox during regular operation. For your current NPI validation scenario, the root cause of both warpage after high temperature aging and micro cracks on mounting bosses almost never comes from single parameter adjustment on temporary prototype tooling, it traces back to mismatches between material selection, design feature configuration and formal production process window that you will use for mass production. First, sort out the applicable scenario baseline first. For 18V cordless impact driver housing, the standard operating environment covers -10°C to 65°C, 1.5g RMS continuous vibration, and repeated impact force up to 15N when the trigger is pressed. Any adjustment you make has to be aligned with this baseline, rather than optimizing performance under lab static conditions. If you are currently using general grade ABS for prototype testing, that is the most common hidden mismatch, as general ABS has 30% lower notched impact strength at low temperature than the required modified grade for power tools. Prioritize 3 non-negotiable validation steps before final tooling sign off . First, confirm that the material you will use for formal production is 20% glass fiber reinforced impact modified Nylon, or impact modified PC+ABS blend that has been pre-conditioned with 0.3-0.5% mold release agent matched for your part geometry, do not use any off-the-shelf generic resin that does not have power tool industry grade certification records. Second, run a full 72 hour post-molding annealing test on 50 production grade samples, not prototype parts, to lock the dimension variation within ±0.15mm on all mounting boss positions. Third, run 1500 cycles of vibration test on the annealed samples, not the as-molded parts, to confirm no micro cracks appear. The next step is to classify the acceptable defect threshold for mass production. For OEM power tool housing, cosmetic defects such as minor flow marks on non-contact hidden surfaces can be accepted within pre-defined AQL 2.5, but any crack, warp over 0.2mm, or mounting boss dimension out of tolerance has to be classified as critical defect that triggers 100% sorting. Lock the design freeze for all structural features at least 2 weeks before formal steel machining of the production mold , any last minute modification will add hidden stress points on the housing that will cause unexpected field failures 6-12 months after products are shipped. For your project timeline, you can skip the redundant full function validation on prototype tooling if you follow above steps, and reserve 7 days for formal trial run of the new production mold, to confirm the process window is wide enough to run 3 consecutive 12 hour production shifts with consistent defect rate below 1%. Do not start mass production until you get 3 consecutive batches of 200 samples all passing the aging and vibration test . This will reduce your overall NPI lead time by 10-15 days, and avoid the 15-20% scrap rate that most teams face when they rush to production without full validation.", "upvoteCount": 13, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#acceptedAnswer", "datePublished": "2026-09-20T04:21:52Z", "author": {"@type": "Person","name": "Emily Chen","url": "https://www.ok-tool.com/team/emily.html"} } ,"suggestedAnswer": [ { "@type": "Answer", "text": "Adjust resin formulation to balance structural strength and fatigue resistance properly. For power tool housing, 15% glass fiber content is the minimum threshold to maintain enough rigidity under continuous vibration, but glass fiber content over 25% will make the material too brittle to absorb sudden impact force during heavy duty operation, which increases the risk of micro crack on sharp corners. The impact modifier dosage should be kept at 8-12% of total resin weight, not the generic 5% used for consumer electronics housings, as extra modifier will improve low temperature impact performance significantly. For incoming material testing, check the melt flow index to stay between 15-25 g/10min at 260°C, and limit the recycled regrind ratio below 10% for all structural parts, as higher regrind content will reduce fatigue strength by over 25% after 500 vibration cycles.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-2", "datePublished": "2026-09-20T04:18:45Z", "author": {"@type": "Person","name": "Amy Li","url": "https://www.ok-tool.com/team/amy.html"} } , { "@type": "Answer", "text": "Add DFM corrections to eliminate hidden stress concentration points before tool steel machining. The mounting boss root should have a minimum transition radius of 0.8mm, no sharp 90 degree corners that will act as crack initiation points during vibration. The wall thickness of all structural sections should be kept consistent at 2.2-2.5mm, no sudden thickness changes that will cause uneven shrinkage and residual stress after molding. The core side draft angle should be set to at least 1.5 degree, not the 1 degree used for general cosmetic parts, to avoid uneven ejection stress that remains locked inside the part, which will release gradually after high temperature aging and cause unexpected warpage. Remove any unnecessary thin ribs less than 1mm thick, as they will not add extra rigidity but create sink marks on the outer cosmetic surface.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-3", "datePublished": "2026-09-20T04:15:19Z", "author": {"@type": "Person","name": "David Zhang","url": "https://www.ok-tool.com/team/david.html"} } , { "@type": "Answer", "text": "Align all performance validation with real end user assembly and operating scenarios. The current vibration test on standalone housing samples cannot reflect the real stress state after the housing is assembled with metal gearbox, motor and battery pack. m for 20 cycles, to confirm no pre-stress is introduced to the mounting bosses during assembly. If the housing inner diameter for gearbox installation is too tight, the forced insertion will create hidden stress that propagates into visible cracks after several hundred hours of field operation. You should also test the housing after it is exposed to -10°C environment for 4 hours, to confirm no brittleness related crack occurs at low temperature.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-4", "datePublished": "2026-09-20T04:01:36Z", "author": {"@type": "Person","name": "Rachel Huang","url": "https://www.ok-tool.com/team/rachel.html"} } , { "@type": "Answer", "text": "Optimize production process layout to reduce inherent defect rate from the source. The current 12% warpage defect rate is mostly caused by uneven cooling on the mold, so add 4 extra cooling lines on the core side corresponding to the mounting boss positions, and keep the temperature difference between mold cavity and core below 5°C, this single adjustment will reduce total warpage by over 80%. Implement layered sampling scheme that takes 5 parts from the production line every 2 hours, measure their warp value and track the trend in real time, so you can adjust cooling water temperature before the defect rate accumulates to over 5%. This lean control method will keep the mass production defect rate stable below 1%, no unexpected quality fluctuation across different shifts.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-5", "datePublished": "2026-09-20T03:59:27Z", "author": {"@type": "Person","name": "Michael Wu","url": "https://www.ok-tool.com/team/michael.html"} } , { "@type": "Answer", "text": "Optimize assembly process and tolerance distribution to avoid cumulative stress on the housing. The position tolerance for all 6 mounting bosses should be controlled within ±0.1mm, not the general ±0.2mm specified on the drawing, otherwise the accumulated tolerance from motor, PCB and battery pack will create extra pulling or pushing force on the housing after assembly, which leads to unexpected crack during operation. Design the assembly sequence to insert the metal gearbox first, then tighten the assembly screws diagonally instead of tightening them one by one in linear sequence, this adjustment alone will reduce boss crack rate during assembly by over 90%. All assembly fixtures should use soft contact pads instead of hard metal edges, to avoid creating tiny surface scratches that can develop into cracks later.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-6", "datePublished": "2026-09-20T03:52:52Z", "author": {"@type": "Person","name": "Daniel Yang","url": "https://www.ok-tool.com/team/daniel.html"} } , { "@type": "Answer", "text": "Build a clear multi-stage inspection system to eliminate critical defects before they flow downstream. Classify defects clearly first: minor flow marks on non-structural hidden surfaces are acceptable at AQL 2.5, but any visible crack on mounting boss root, warp over 0.2mm, or dimension out of tolerance should be classified as critical defect that triggers 100% sorting. Set 3 mandatory inspection check points: first, IQC test incoming resin impact strength for every batch, reject any incoming material that does not meet 8kJ/m² notched impact strength requirement; second, IPQC check 10 parts for dimension every 2 hours during production; third, OQC inspect all mounting boss positions under 5X magnifier before packaging, and take 0.5% random samples per batch to run vibration test to catch hidden quality fluctuation.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-7", "datePublished": "2026-09-20T03:44:29Z", "author": {"@type": "Person","name": "Eric Zhao","url": "https://www.ok-tool.com/team/eric.html"} } , { "@type": "Answer", "text": "Optimize injection process parameters to reduce residual stress inside molded parts. The micro cracks you found after vibration test are mostly caused by excessive packing pressure that freezes high internal stress inside the part during molding, this hidden stress does not show up on as-molded samples, but will release gradually under high temperature and continuous vibration, leading to crack initiation. Lower the packing pressure by 15-20%, extend the holding time by 3 seconds, reduce melt temperature by 10°C, and add a 10 second slow cooling phase after holding before mold opening, this set of adjustment will reduce residual stress inside the part by over 40%, almost eliminate the post aging warp issue. Do not use fast cycle time optimization at this stage, as it will lock more internal stress inside the parts and damage long term fatigue performance.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-8", "datePublished": "2026-09-20T03:42:42Z", "author": {"@type": "Person","name": "Jason Zhou","url": "https://www.ok-tool.com/team/jason.html"} } , { "@type": "Answer", "text": "Configure the production line properly to ensure consistent part quality across 24/7 mass runs. Use a 180T injection press with closed loop pressure control for this power tool housing, not a general open loop press, as closed loop control can guarantee every shot has identical pressure profile, so there is almost no part to part variation in shrinkage and stress state. Integrate automatic part ejector and conveyor to transfer hot parts away from the mold, avoid manual touching of hot parts, which causes uneven cooling and random warpage. The optimized cycle time can be controlled at 30 seconds per shot, the line can run continuously for 72 hours with no unplanned downtime, and the output can reach over 2800 pcs per day with consistent quality.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-9", "datePublished": "2026-09-20T03:40:53Z", "author": {"@type": "Person","name": "Linda Xu","url": "https://www.ok-tool.com/team/linda.html"} } , { "@type": "Answer", "text": "Structure the remaining NPI timeline with clear milestones and change control rules to avoid schedule delay. Split the remaining work into 3 sequential milestones: first, material and DFM review sign off completed within 3 days, no unapproved structural design changes after this point; second, first mold trial and full sample validation completed within 7 days, all samples pass aging and vibration test before moving to next step; third, 3 consecutive trial runs sign off completed within 10 days, to confirm the process window is wide enough for mass production. Any design modification requested after DFM sign off has to go through formal change request, with full assessment on tool modification cost, impact on part performance and timeline delay, no undocumented last minute changes are allowed. Arrange short 15 minute daily cross functional sync to resolve issues fast, to ensure mass production kicks off as scheduled.", "upvoteCount": 0, "url": "https://www.ok-tool.com/qa/factors-affecting-vibration-resistance-oem-power-tool-plastic-housing.html#suggestedAnswer-10", "datePublished": "2026-09-20T03:39:42Z", "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": "Custom Manufacturing Q&A >", "item": "https://www.ok-tool.com/qa/oem-odm/>"} ,{"@type": "ListItem", "position": 4, "name": "What key factors affect the vibration resistance of OEM power tool plastic housing?"} ] } ] ```