{"product_id":"m3-m4-m5-knurled-thumb-screws-dia-13mm-plastic-round-head-hand-grip-knob-bolts","title":"M3 M4 M5 Knurled Thumb Screws Dia 13mm Plastic Round Head Hand Grip Knob Bolts","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM3 M4 M5 Knurled Thumb Screws — Tool-Free Fastening for Makers \u0026amp; DIY Builders\u003c\/h2\u003e\n\u003cp\u003eWhen you're deep into a PC build, iterative enclosure prototype, or aluminum extrusion assembly and you need to swap panels without hunting for a screwdriver, standard hex bolts become a real bottleneck. These M3 M4 M5 knurled thumb screws with a 13mm plastic round head are designed for makers, PC modders, and small-team fabricators who need repeatable, hand-tightened access without tool dependency.\u003c\/p\u003e\n\u003cp\u003eEach screw features a 13mm diameter plastic round knob head with a knurled grip surface, paired with a steel threaded shank. Thread diameters span M3, M4, and M5; shank lengths range from 6mm to 40mm (approximately 0.24\" to 1.57\"). Packs are available in 2, 5, 10, 20, and 50 pieces to match both one-off builds and ongoing production runs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include securing side panels on PC cases and custom enclosures, fastening access covers on 2020\/3030 aluminum extrusion frames, and attaching removable guards or inspection plates on DIY CNC and 3D printer builds — all without reaching for a tool.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e Compatible with standard M3, M4, and M5 threaded holes. Verify thread pitch and hole depth against your variant selection before assembly.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Knurled Thumb Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e13mm Round Knob Head\u003c\/strong\u003e — Wide-diameter plastic head distributes finger pressure evenly, reducing fatigue during repeated open\/close cycles on access panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnurled Grip Surface\u003c\/strong\u003e — Circumferential knurling on the head provides tactile purchase even with slightly damp or gloved hands, so fasteners stay under control during assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Size Range (M3 \/ M4 \/ M5)\u003c\/strong\u003e — A single product family covers the three most common metric thread diameters used in PC hardware, enclosure fabrication, and extrusion-based builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Lengths 6–40mm\u003c\/strong\u003e — From shallow panel-mount applications (6mm) to deeper structural passes (40mm), the length matrix lets you match thread engagement to your specific stack-up without shimming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Pack Quantities (2–50 pcs)\u003c\/strong\u003e — Order a 2-piece trial set to verify fit, or stock up with a 50-piece pack for production builds and spare-parts inventory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel Threaded Shank\u003c\/strong\u003e — The metal shank handles the mechanical load while the plastic head keeps weight low and prevents marring of anodized or painted panel surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Knurled Thumb Screws\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eRound knob, knurled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003e13mm (approx. 0.51\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Material\u003c\/th\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShank Material\u003c\/th\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric (M3 \/ M4 \/ M5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Shank Lengths\u003c\/th\u003e\n\u003ctd\u003e6, 8, 10, 12, 16, 20, 25, 30, 35, 40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand-tightened (no tool required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 50 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right thread size — M3, M4, or M5?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the thread diameter to your existing threaded hole or insert. M3 (3mm) is standard for PC motherboard standoffs and small electronics enclosures. M4 (4mm) is common in aluminum extrusion T-slot hardware and mid-size panel mounts. M5 (5mm) suits heavier structural applications such as 3030 extrusion frames and thicker steel panels. When in doubt, measure the inner diameter of your threaded hole with a caliper — it should match the nominal thread size within a fraction of a millimeter.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct shank length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAdd up the total material thickness the screw must pass through, then add at least 3–5 thread pitches of engagement depth in the receiving nut or threaded hole. For example, a 2mm panel plus a 4mm nut would need at minimum an 8mm shank. Choosing a shank that is too short risks stripping; too long risks bottoming out before the head seats. When stacking multiple panels or using captured nuts, measure the full stack-up before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these thumb screws strong enough for structural use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese fasteners are designed for hand-tightened, low-torque applications — panel retention, access covers, and removable guards — rather than high-load structural joints. The steel shank provides adequate shear and tensile strength for typical enclosure and PC case use. If your application requires torque values above what can be applied by hand, a tool-driven fastener with a defined torque specification is more appropriate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill the plastic head scratch my anodized aluminum panels?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe plastic round head is softer than anodized aluminum, so it is less likely to mar the surface than a metal-headed fastener. For particularly sensitive finishes, you can place a thin nylon or rubber washer between the head and the panel face. Avoid over-tightening, which can deform the plastic head and increase contact pressure on the panel surface.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in outdoor or high-humidity environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe steel shank is susceptible to surface oxidation in prolonged outdoor or high-humidity exposure. For occasional outdoor use, applying a light coat of corrosion-inhibiting grease to the shank threads will extend service life. For continuous outdoor or marine environments, consider stainless steel thumb screws instead. The plastic head itself is not affected by moisture.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide between a 2-piece and a 50-piece pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 2-piece pack is ideal for verifying fit and thread engagement before committing to a larger quantity — particularly useful when you are prototyping a new enclosure design or sourcing a replacement for a single lost fastener. The 5- and 10-piece packs suit single-build projects with multiple access points. The 20- and 50-piece packs offer a lower per-unit cost and are suited for production runs, workshop stock, or builds with many removable panels.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo these thumb screws work with standard T-slot nuts in aluminum extrusions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided you select the matching thread size. M3 thumb screws pair with M3 T-slot nuts in 2020 extrusions; M4 with M4 T-slot nuts in 2020 or 3030 profiles; M5 with M5 T-slot nuts in 3030 or 4040 profiles. Confirm the T-slot nut thread and the extrusion slot width before ordering to ensure compatibility with your specific extrusion profile brand.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Size and Packing QTY above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right thread size — M3, M4, or M5?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the thread diameter to your existing threaded hole or insert. M3 is standard for PC motherboard standoffs and small electronics enclosures. M4 is common in aluminum extrusion T-slot hardware and mid-size panel mounts. 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For continuous outdoor or marine environments, consider stainless steel thumb screws instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between a 2-piece and a 50-piece pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 2-piece pack is ideal for verifying fit before committing to a larger quantity. The 5- and 10-piece packs suit single-build projects. The 20- and 50-piece packs offer a lower per-unit cost and are suited for production runs, workshop stock, or builds with many removable panels.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these thumb screws work with standard T-slot nuts in aluminum extrusions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided you select the matching thread size. M3 pairs with M3 T-slot nuts in 2020 extrusions; M4 with M4 T-slot nuts in 2020 or 3030 profiles; M5 with M5 T-slot nuts in 3030 or 4040 profiles.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"M3 x 6mm \/ 2 PCS","offer_id":52292136927506,"sku":"AdaahGL-SYWJ01692x2","price":6.24,"currency_code":"USD","in_stock":true},{"title":"M3 x 6mm \/ 5 PCS","offer_id":52292136960274,"sku":"AdaahGL-SYWJ01692x5","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 6mm \/ 10 PCS","offer_id":52292136993042,"sku":"AdaahGL-SYWJ01692x10","price":8.96,"currency_code":"USD","in_stock":true},{"title":"M3 x 6mm \/ 20 PCS","offer_id":52292137025810,"sku":"AdaahGL-SYWJ01692x20","price":15.9,"currency_code":"USD","in_stock":true},{"title":"M3 x 6mm \/ 50 PCS","offer_id":52292137058578,"sku":"AdaahGL-SYWJ01692x50","price":36.57,"currency_code":"USD","in_stock":true},{"title":"M3 x 8mm \/ 2 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