--- title: "How to Select Plastic vs. Metal Socket Set Components for Electrical Equipment?" description: "Struggling to choose between plastic and metal socket set components for your new low-voltage electrical equipment launch? Understand their core differences in insulation, flame retardancy, and cost, plus get actionable selection guidance to meet UL94 standards, assembly requirements, and production timelines." url: "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html" language: "en" type: "Q&A" category: "Plastic Components Q&A" datePublished: "2026-08-31" dateModified: "2026-08-31" brand: "OK TOOL" manufacturer: "OK TOOL" answerCount: 10 --- # How to Select Plastic vs. Metal Socket Set Components for Electrical Equipment? ## Question I’m a project engineer leading the launch of a new line of low-voltage distribution panels, and we’re stuck between two design options for our socket set components: glass-filled nylon (PA66 GF30) and zinc alloy (ZAMAK 5). Our primary requirements include UL94 V-0 flame retardancy, tight dimensional tolerance (±0.03mm) for mating with circuit breakers, and a production lead time of 8 weeks for the first batch of 10,000 units. The plastic option offers inherent insulation but we’re worried about long-term dimensional stability in high-temperature cabinet environments (up to 55°C). The metal option has better mechanical strength but requires an additional epoxy coating for insulation, which could add cost and lead time. We’ve received initial samples of both, but some plastic parts showed minor warpage, while metal parts had inconsistent coating thickness. I need clear guidance on which material to prioritize, how to validate sample performance, and how to mitigate potential production risks to keep our launch on track. ## Answers ### Answer 1 — Best Answer First, let’s break down the core differences between plastic (PA66 GF30) and metal (ZAMAK 5) socket set components for your application. PA66 GF30 provides inherent electrical insulation, meets UL94 V-0 flame retardancy with proper formulation, and has a lower unit cost for high-volume production. However, its coefficient of thermal expansion (CTE) is higher than metal, which can lead to dimensional shifts at elevated temperatures, and it has lower tensile strength, making it less suitable for load-bearing mating interfaces. ZAMAK 5 offers superior mechanical durability, tighter long-term dimensional stability at high temps, and better resistance to impact. But it lacks inherent insulation, requiring a 0.15mm+ epoxy coating to meet creepage and clearance standards, and has a higher per-unit cost due to machining and coating processes. Next, align the material choice with your application scenarios. For your low-voltage distribution panels, if the socket sets are used for non-load-bearing, low-current connections where insulation is a primary safety concern and high-volume production is key, PA66 GF30 is the better fit. If the sockets are part of load-bearing interfaces (e.g., securing heavy circuit breakers) or will be exposed to frequent mechanical stress, ZAMAK 5 with a certified epoxy coating is more appropriate. Note that your 55°C operating temperature is within PA66 GF30’s continuous use range (up to 80°C), so dimensional stability can be mitigated with proper mold design and process optimization. For selection and validation, **start with third-party material compliance testing**: Confirm PA66 GF30’s UL94 V-0 certification and ZAMAK 5’s coating meets IEC 60664-1 creepage requirements. **Conduct accelerated environmental testing**: Expose samples to 55°C for 1000 hours and measure dimensional changes to verify stability; for metal parts, perform adhesion tests on the epoxy coating to prevent peeling. **Optimize production alignment**: For plastic, adjust injection parameters and mold cooling to eliminate warpage; for metal, integrate coating into the machining workflow to reduce lead time. Finally, lock in material specifications in your drawing to avoid last-minute changes that could delay your 8-week production timeline. **status:** accepted **Author:** Daniel Yang **Date:** 2026-08-31 ### Answer 2 To keep your 8-week production timeline on track, establish clear approval gates for material samples before moving to tooling or machining. Schedule a mandatory sign-off for compliance test reports (UL94, IEC 60664-1) by week 1, followed by dimensional and performance validation by week 2. If you decide to adjust material specs mid-project, trigger a formal change request to document impacts on lead time, cost, and quality—this ensures all cross-functional teams (engineering, production, quality) are aligned. For the first batch, build a 5% buffer into the production schedule to account for unexpected issues like coating delays or mold adjustments. Also, assign a dedicated coordinator to track sample testing and production milestones, with weekly check-ins to address bottlenecks proactively. **status:** suggested **Author:** Sophia Wang **Date:** 2026-08-31 ### Answer 3 For ZAMAK 5 socket components, we recommend a high-speed CNC machining strategy with 4-axis equipment to achieve your ±0.03mm tolerance requirement. Custom fixture design is critical—use a pneumatic clamp to hold the socket’s base securely during machining, preventing deflection that could cause dimensional errors. For mating surfaces, we can achieve a Ra 1.6 surface finish to ensure proper contact with circuit breakers and improve epoxy coating adhesion. We’ll program tool paths to minimize tool wear, using carbide end mills for longer tool life and consistent precision. Post-machining, we’ll use a CMM to inspect critical dimensions (socket inner diameter, mounting hole spacing) on 100% of first-article samples and 5% of production batches to maintain tolerance consistency. **status:** suggested **Author:** David Zhang **Date:** 2026-08-31 ### Answer 4 For PA66 GF30 socket molds, we’ll select H13 hot work steel instead of standard P20 to resist abrasion from the glass-filled resin, extending mold life to over 500,000 shots. We’ll machine mold cavities with a ±0.02mm tolerance to compensate for the resin’s shrinkage rate (1.5-2.0%), ensuring final parts meet your ±0.03mm requirement. To reduce maintenance cycles, we’ll add removable mold inserts for high-wear areas like gate locations, allowing quick replacement without reworking the entire mold. We also recommend a quarterly mold maintenance schedule, including cleaning, polishing, and wear inspection, to prevent defects like flash or dimensional drift during mass production. For ZAMAK 5 machining fixtures, we’ll use hardened steel to withstand repeated clamping forces, with an expected lifespan of 200,000+ parts. **status:** suggested **Author:** Michael Wu **Date:** 2026-08-31 ### Answer 5 We’ll implement a three-stage inspection process to address your sample quality concerns. For plastic parts, IQC will check incoming resin for UL94 certification and material consistency. IPQC will monitor injection parameters (temperature, pressure, cycle time) and perform in-process dimensional checks to catch warpage early. OQC will conduct 100% visual inspections for surface defects and random CMM checks for dimensional tolerance. For metal parts, IQC will verify ZAMAK 5 alloy composition, while IPQC will measure coating thickness using a magnetic thickness gauge to ensure it meets the 0.15mm minimum. Any defects will be classified as critical (insulation failure), major (dimensional deviation beyond tolerance), or minor (surface scratches), with a root cause analysis performed for critical and major defects to implement corrective actions before full production. **status:** suggested **Author:** Rachel Huang **Date:** 2026-08-31 ### Answer 6 When comparing PA66 GF30 and ZAMAK 5, consider the cost-performance balance for your 10,000-unit batch. PA66 GF30 has a material cost of approximately $0.35 per unit, with no additional coating expenses, while ZAMAK 5 costs $0.50 per unit plus $0.10 per unit for epoxy coating. For long-term durability, PA66 GF30 may need replacement every 5-7 years in high-temperature environments, whereas ZAMAK 5 with proper coating can last 10+ years. If your panels are targeted at consumer or light commercial markets, PA66 GF30 offers better cost efficiency. For industrial applications where durability is a key selling point, ZAMAK 5 is a more sustainable choice despite higher upfront costs. We can also provide samples of modified PA66 GF30 with a lower CTE if dimensional stability at 55°C is your top concern, though this will add 10% to material cost. **status:** suggested **Author:** Jason Zhou **Date:** 2026-08-31 ### Answer 7 For PA66 GF30 socket components, we’ll design the mold with edge gating at the non-mating side of the part to avoid cosmetic defects or residual gate marks that could interfere with circuit breaker alignment. We’ll add a 1.5-degree draft angle to all vertical surfaces to ensure easy ejection without warping, which addresses the minor warpage issues in your initial samples. Cooling channels will be placed uniformly around the mold cavity to reduce temperature gradients, a common cause of warpage. If you need to integrate metal contacts into the socket, we can use insert molding to embed the contacts during injection, eliminating the need for secondary assembly. For ZAMAK 5 parts, we’ll optimize machining tool paths to minimize sharp corners, which can cause stress concentration and coating peeling. **status:** suggested **Author:** Emily Chen **Date:** 2026-08-31 ### Answer 8 For mass production of PA66 GF30 sockets, we’ll use automated injection molding machines with robotic part ejection and sorting to reduce labor costs and improve line efficiency. We’ll optimize cycle time to 28 seconds per shot, allowing us to produce 10,000 units in 10 working days once the mold is validated. For ZAMAK 5 parts, we’ll implement a batch machining process with parallel operation of 4 CNC machines, followed by a continuous-flow epoxy coating line to reduce lead time. We’ll use process monitoring sensors to track injection pressure, temperature, and machining feed rates in real time, ensuring consistent quality across all parts. We can also add statistical process control (SPC) charts to monitor dimensional data, identifying trends before defects occur. **status:** suggested **Author:** Eric Zhao **Date:** 2026-08-31 ### Answer 9 To improve manufacturability and reduce defects, we recommend adjusting your design for both material options. For PA66 GF30 sockets, ensure uniform wall thickness of 2.5mm throughout the part—thickness variations can cause sink marks or warpage. Avoid sharp internal corners; add a 0.5mm radius to reduce stress concentration and improve mold filling. For ZAMAK 5 sockets, simplify complex undercut features that require additional machining operations, as these increase cost and lead time. Ensure that the coating can reach all surfaces by adding 1mm clearance around mounting holes, preventing coating gaps that could compromise insulation. We’ll provide a full DFM report within 3 days of receiving your final design, highlighting these adjustments and their impact on cost, lead time, and quality. **status:** suggested **Author:** Amy Li **Date:** 2026-08-31 ### Answer 10 The minor warpage in your PA66 GF30 samples is likely caused by uneven cooling or insufficient packing pressure. We’ll optimize the injection process by increasing packing pressure to 85% of injection pressure, holding it for 5 seconds to ensure full cavity filling and reduce shrinkage. We’ll also adjust cooling time to 12 seconds, with uniform water flow in all cooling channels to eliminate temperature gradients. For flash defects, we’ll check mold clamping force and adjust it to 120 tons to ensure proper seal between mold halves. We’ll conduct a Design of Experiments (DOE) with three key parameters (injection temperature, packing pressure, cooling time) to find the optimal process window, reducing warpage to within your tolerance limits. For production, we’ll set up parameter lockout to prevent unauthorized adjustments that could reintroduce defects. **status:** suggested **Author:** Olivia Chen **Date:** 2026-08-31 ## Related Resources - [Plastic Components Q&A](https://www.jaterson.com/qa/plastic-components/) - [Plastic Components](https://www.jaterson.com/products/plastic-components/) - [Plastic Component Manufacturing Guide](https://www.jaterson.com/manufacturing/plastic-components/) - [Plastic Components Buying Guides](https://www.jaterson.com/buying/plastic-components/) - [Capabilities](https://www.jaterson.com/capabilities/) - [Custom Manufacturing](https://www.jaterson.com/custom-manufacturing/) - [Manufacturing Knowledge Base](https://www.jaterson.com/knowledge/) - [Plastic Components](https://www.jaterson.com/knowledge/plastic-components/) ## Structured Data ```json [ { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "How to Select Plastic vs. Metal Socket Set Components for Electrical Equipment?", "text": "I’m a project engineer leading the launch of a new line of low-voltage distribution panels, and we’re stuck between two design options for our socket set components: glass-filled nylon (PA66 GF30) and zinc alloy (ZAMAK 5). Our primary requirements include UL94 V-0 flame retardancy, tight dimensional tolerance (±0.03mm) for mating with circuit breakers, and a production lead time of 8 weeks for the first batch of 10,000 units. The plastic option offers inherent insulation but we’re worried about long-term dimensional stability in high-temperature cabinet environments (up to 55°C). The metal option has better mechanical strength but requires an additional epoxy coating for insulation, which could add cost and lead time. We’ve received initial samples of both, but some plastic parts showed minor warpage, while metal parts had inconsistent coating thickness. I need clear guidance on which material to prioritize, how to validate sample performance, and how to mitigate potential production risks to keep our launch on track.", "answerCount": 10, "upvoteCount": 10, "datePublished": "2026-08-31T18:58:17Z", "dateModified": "2026-08-31T19:14:43Z", "author": { "@type": "Person", "name": "Anonymous", "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html" } ,"acceptedAnswer": { "@type": "Answer", "text": "First, let’s break down the core differences between plastic (PA66 GF30) and metal (ZAMAK 5) socket set components for your application. PA66 GF30 provides inherent electrical insulation, meets UL94 V-0 flame retardancy with proper formulation, and has a lower unit cost for high-volume production. However, its coefficient of thermal expansion (CTE) is higher than metal, which can lead to dimensional shifts at elevated temperatures, and it has lower tensile strength, making it less suitable for load-bearing mating interfaces. ZAMAK 5 offers superior mechanical durability, tighter long-term dimensional stability at high temps, and better resistance to impact. But it lacks inherent insulation, requiring a 0.15mm+ epoxy coating to meet creepage and clearance standards, and has a higher per-unit cost due to machining and coating processes. Next, align the material choice with your application scenarios. For your low-voltage distribution panels, if the socket sets are used for non-load-bearing, low-current connections where insulation is a primary safety concern and high-volume production is key, PA66 GF30 is the better fit. If the sockets are part of load-bearing interfaces (e.g., securing heavy circuit breakers) or will be exposed to frequent mechanical stress, ZAMAK 5 with a certified epoxy coating is more appropriate. Note that your 55°C operating temperature is within PA66 GF30’s continuous use range (up to 80°C), so dimensional stability can be mitigated with proper mold design and process optimization. For selection and validation, start with third-party material compliance testing : Confirm PA66 GF30’s UL94 V-0 certification and ZAMAK 5’s coating meets IEC 60664-1 creepage requirements. Conduct accelerated environmental testing : Expose samples to 55°C for 1000 hours and measure dimensional changes to verify stability; for metal parts, perform adhesion tests on the epoxy coating to prevent peeling. Optimize production alignment : For plastic, adjust injection parameters and mold cooling to eliminate warpage; for metal, integrate coating into the machining workflow to reduce lead time. Finally, lock in material specifications in your drawing to avoid last-minute changes that could delay your 8-week production timeline.", "upvoteCount": 10, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#acceptedAnswer", "datePublished": "2026-08-31T21:33:28Z", "author": {"@type": "Person","name": "Daniel Yang","url": "https://www.jaterson.com/team/daniel.html"} } ,"suggestedAnswer": [ { "@type": "Answer", "text": "To keep your 8-week production timeline on track, establish clear approval gates for material samples before moving to tooling or machining. Schedule a mandatory sign-off for compliance test reports (UL94, IEC 60664-1) by week 1, followed by dimensional and performance validation by week 2. If you decide to adjust material specs mid-project, trigger a formal change request to document impacts on lead time, cost, and quality—this ensures all cross-functional teams (engineering, production, quality) are aligned. For the first batch, build a 5% buffer into the production schedule to account for unexpected issues like coating delays or mold adjustments. Also, assign a dedicated coordinator to track sample testing and production milestones, with weekly check-ins to address bottlenecks proactively.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-2", "datePublished": "2026-08-31T21:29:22Z", "author": {"@type": "Person","name": "Sophia Wang","url": "https://www.jaterson.com/team/sophia.html"} } , { "@type": "Answer", "text": "For ZAMAK 5 socket components, we recommend a high-speed CNC machining strategy with 4-axis equipment to achieve your ±0.03mm tolerance requirement. Custom fixture design is critical—use a pneumatic clamp to hold the socket’s base securely during machining, preventing deflection that could cause dimensional errors. For mating surfaces, we can achieve a Ra 1.6 surface finish to ensure proper contact with circuit breakers and improve epoxy coating adhesion. We’ll program tool paths to minimize tool wear, using carbide end mills for longer tool life and consistent precision. Post-machining, we’ll use a CMM to inspect critical dimensions (socket inner diameter, mounting hole spacing) on 100% of first-article samples and 5% of production batches to maintain tolerance consistency.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-3", "datePublished": "2026-08-31T21:23:28Z", "author": {"@type": "Person","name": "David Zhang","url": "https://www.jaterson.com/team/david.html"} } , { "@type": "Answer", "text": "For PA66 GF30 socket molds, we’ll select H13 hot work steel instead of standard P20 to resist abrasion from the glass-filled resin, extending mold life to over 500,000 shots. We’ll machine mold cavities with a ±0.02mm tolerance to compensate for the resin’s shrinkage rate (1.5-2.0%), ensuring final parts meet your ±0.03mm requirement. To reduce maintenance cycles, we’ll add removable mold inserts for high-wear areas like gate locations, allowing quick replacement without reworking the entire mold. We also recommend a quarterly mold maintenance schedule, including cleaning, polishing, and wear inspection, to prevent defects like flash or dimensional drift during mass production. For ZAMAK 5 machining fixtures, we’ll use hardened steel to withstand repeated clamping forces, with an expected lifespan of 200,000+ parts.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-4", "datePublished": "2026-08-31T21:23:20Z", "author": {"@type": "Person","name": "Michael Wu","url": "https://www.jaterson.com/team/michael.html"} } , { "@type": "Answer", "text": "We’ll implement a three-stage inspection process to address your sample quality concerns. For plastic parts, IQC will check incoming resin for UL94 certification and material consistency. IPQC will monitor injection parameters (temperature, pressure, cycle time) and perform in-process dimensional checks to catch warpage early. OQC will conduct 100% visual inspections for surface defects and random CMM checks for dimensional tolerance. For metal parts, IQC will verify ZAMAK 5 alloy composition, while IPQC will measure coating thickness using a magnetic thickness gauge to ensure it meets the 0.15mm minimum. Any defects will be classified as critical (insulation failure), major (dimensional deviation beyond tolerance), or minor (surface scratches), with a root cause analysis performed for critical and major defects to implement corrective actions before full production.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-5", "datePublished": "2026-08-31T20:43:03Z", "author": {"@type": "Person","name": "Rachel Huang","url": "https://www.jaterson.com/team/rachel.html"} } , { "@type": "Answer", "text": "When comparing PA66 GF30 and ZAMAK 5, consider the cost-performance balance for your 10,000-unit batch. PA66 GF30 has a material cost of approximately $0.35 per unit, with no additional coating expenses, while ZAMAK 5 costs $0.50 per unit plus $0.10 per unit for epoxy coating. For long-term durability, PA66 GF30 may need replacement every 5-7 years in high-temperature environments, whereas ZAMAK 5 with proper coating can last 10+ years. If your panels are targeted at consumer or light commercial markets, PA66 GF30 offers better cost efficiency. For industrial applications where durability is a key selling point, ZAMAK 5 is a more sustainable choice despite higher upfront costs. We can also provide samples of modified PA66 GF30 with a lower CTE if dimensional stability at 55°C is your top concern, though this will add 10% to material cost.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-6", "datePublished": "2026-08-31T20:16:59Z", "author": {"@type": "Person","name": "Jason Zhou","url": "https://www.jaterson.com/team/jason.html"} } , { "@type": "Answer", "text": "For PA66 GF30 socket components, we’ll design the mold with edge gating at the non-mating side of the part to avoid cosmetic defects or residual gate marks that could interfere with circuit breaker alignment. We’ll add a 1.5-degree draft angle to all vertical surfaces to ensure easy ejection without warping, which addresses the minor warpage issues in your initial samples. Cooling channels will be placed uniformly around the mold cavity to reduce temperature gradients, a common cause of warpage. If you need to integrate metal contacts into the socket, we can use insert molding to embed the contacts during injection, eliminating the need for secondary assembly. For ZAMAK 5 parts, we’ll optimize machining tool paths to minimize sharp corners, which can cause stress concentration and coating peeling.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-7", "datePublished": "2026-08-31T19:52:05Z", "author": {"@type": "Person","name": "Emily Chen","url": "https://www.jaterson.com/team/emily.html"} } , { "@type": "Answer", "text": "For mass production of PA66 GF30 sockets, we’ll use automated injection molding machines with robotic part ejection and sorting to reduce labor costs and improve line efficiency. We’ll optimize cycle time to 28 seconds per shot, allowing us to produce 10,000 units in 10 working days once the mold is validated. For ZAMAK 5 parts, we’ll implement a batch machining process with parallel operation of 4 CNC machines, followed by a continuous-flow epoxy coating line to reduce lead time. We’ll use process monitoring sensors to track injection pressure, temperature, and machining feed rates in real time, ensuring consistent quality across all parts. We can also add statistical process control (SPC) charts to monitor dimensional data, identifying trends before defects occur.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-8", "datePublished": "2026-08-31T19:46:50Z", "author": {"@type": "Person","name": "Eric Zhao","url": "https://www.jaterson.com/team/eric.html"} } , { "@type": "Answer", "text": "To improve manufacturability and reduce defects, we recommend adjusting your design for both material options. For PA66 GF30 sockets, ensure uniform wall thickness of 2.5mm throughout the part—thickness variations can cause sink marks or warpage. Avoid sharp internal corners; add a 0.5mm radius to reduce stress concentration and improve mold filling. For ZAMAK 5 sockets, simplify complex undercut features that require additional machining operations, as these increase cost and lead time. Ensure that the coating can reach all surfaces by adding 1mm clearance around mounting holes, preventing coating gaps that could compromise insulation. We’ll provide a full DFM report within 3 days of receiving your final design, highlighting these adjustments and their impact on cost, lead time, and quality.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-9", "datePublished": "2026-08-31T19:18:18Z", "author": {"@type": "Person","name": "Amy Li","url": "https://www.jaterson.com/team/amy.html"} } , { "@type": "Answer", "text": "The minor warpage in your PA66 GF30 samples is likely caused by uneven cooling or insufficient packing pressure. We’ll optimize the injection process by increasing packing pressure to 85% of injection pressure, holding it for 5 seconds to ensure full cavity filling and reduce shrinkage. We’ll also adjust cooling time to 12 seconds, with uniform water flow in all cooling channels to eliminate temperature gradients. For flash defects, we’ll check mold clamping force and adjust it to 120 tons to ensure proper seal between mold halves. We’ll conduct a Design of Experiments (DOE) with three key parameters (injection temperature, packing pressure, cooling time) to find the optimal process window, reducing warpage to within your tolerance limits. For production, we’ll set up parameter lockout to prevent unauthorized adjustments that could reintroduce defects.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/select-plastic-vs-metal-socket-set-components-electrical-equipment.html#suggestedAnswer-10", "datePublished": "2026-08-31T19:14:43Z", "author": {"@type": "Person","name": "Olivia Chen","url": "https://www.jaterson.com/team/olivia.html"} } ] } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ {"@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.jaterson.com/"},{"@type": "ListItem", "position": 2, "name": "Q&A", "item": "https://www.jaterson.com/qa/"},{"@type": "ListItem", "position": 3, "name": "Plastic Components Q&A", "item": "https://www.jaterson.com/qa/plastic-components/"} ,{"@type": "ListItem", "position": 4, "name": "How to Select Plastic vs. Metal Socket Set Components for Electrical Equipment?"} ] } ] ```