{"product_id":"m4-knurled-screws-length-5-6-8-10-12-30mm-thumb-bolt-carbon-steel-nickel-plated","title":"M4 Knurled Screws Length 5\/6\/8\/10\/12~30mm Thumb Bolt Carbon Steel Nickel Plated","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM4 Knurled Thumb Screws — Hand-Tighten Carbon Steel Fasteners for Panels, Enclosures \u0026amp; Fixtures\u003c\/h2\u003e\n\u003cp\u003eWhen you need a fastener you can tighten and release repeatedly without reaching for a screwdriver, a loose or stripped bolt becomes a real problem. M4 knurled thumb screws are the go-to solution for engineers, makers, and maintenance technicians who need tool-free access to panels, covers, and equipment enclosures on a regular basis.\u003c\/p\u003e\n\u003cp\u003eThese M4 knurled thumb screws are machined from carbon steel and finished with a nickel plating that resists surface oxidation in typical indoor environments. The M4 metric thread (0.7 mm pitch) is compatible with standard M4 tapped holes and hex nuts. Available lengths run from 5 mm (~0.20 in) to 30 mm (~1.18 in), letting you match grip depth to your specific stack-up. Packs are offered in quantities of 5, 8, 10, 30, and 50 pieces.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include 3D printer frame assemblies where bed access panels are removed frequently, electronics enclosures and server rack covers that require periodic inspection, DIY jigs and fixtures in woodworking or metalworking shops, and RC vehicle body mounts where fast field swaps matter. The knurled head provides enough grip surface for reliable hand-torque in M4 knurled thumb screw applications without marring surrounding surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard M4 × 0.7 mm tapped holes and M4 hex nuts. Verify thread engagement depth against your panel thickness before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These M4 Knurled Thumb Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eTool-Free Operation\u003c\/strong\u003e — Knurled head profile allows firm hand-tightening and release without a screwdriver or wrench, reducing service time on frequently accessed panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eM4 × 0.7 mm Metric Thread\u003c\/strong\u003e — Standard pitch ensures drop-in compatibility with M4 tapped holes, threaded inserts, and M4 hex nuts across metric hardware systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eNickel-Plated Carbon Steel\u003c\/strong\u003e — The electroplated nickel finish adds a corrosion-inhibiting barrier over the carbon steel core, extending service life in dry and low-humidity indoor environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e10 Length Options (5–30 mm)\u003c\/strong\u003e — Choose from M4x5 mm through M4x30 mm to match your exact thread engagement requirement, whether fastening thin sheet metal or thicker structural panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in packs of 5, 8, 10, 30, or 50 pieces, so you can order a trial set or stock up for a production run without overpaying.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eReusable Fastener Design\u003c\/strong\u003e — The rolled or cut M4 thread maintains dimensional accuracy through repeated installation and removal cycles, making these suitable for maintenance-intensive assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — M4 Knurled Thumb Screws\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 20 mm, 25 mm, 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eKnurled thumb (cylindrical knurled head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand-tighten (no tool required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNickel plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Height\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e5 \/ 8 \/ 10 \/ 30 \/ 50 pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandards\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003cdetails\u003e\n\u003csummary\u003eWhich length should I choose for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect a length that gives at least 1.5× the thread diameter of engagement — for M4, that means a minimum of 6 mm of thread engagement into the tapped hole or nut. Measure your panel or bracket thickness, add any washer stack, and choose the next available length that keeps the screw flush or slightly proud of the mating surface.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these screws strong enough for structural fastening?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese carbon steel thumb screws are designed for light-duty clamping and panel retention rather than high-load structural joints. They are well-suited for enclosure covers, access panels, jigs, and fixtures where hand-torque levels are appropriate. For joints requiring torque wrench tightening or high shear loads, a hex-head or socket-head cap screw is a better choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the nickel plating protect against rust outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe nickel plating provides meaningful corrosion resistance in dry indoor environments and low-humidity conditions. It is not rated for continuous outdoor exposure, salt spray, or high-moisture environments. For outdoor or marine use, consider stainless steel thumb screws instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard M4 hex nuts and threaded inserts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The M4 × 0.7 mm thread is the standard coarse pitch for M4 fasteners and mates directly with M4 hex nuts, nylon-insert lock nuts, and M4 threaded inserts (heat-set or press-fit). Always verify the insert's thread specification before assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide between the different pack quantities?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 5- and 8-piece packs are ideal for single-project use or testing fit before committing to a larger order. The 10-piece pack suits small batch builds. The 30- and 50-piece packs offer a lower per-unit cost and are practical for production runs, workshop stock, or projects with many access points.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in a 3D printer or electronics enclosure?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — M4 knurled thumb screws are widely used in 3D printer frame panels, electronics enclosures, and server rack covers. The tool-free design is particularly useful when you need to open and close an enclosure frequently for maintenance or adjustments. Confirm your enclosure uses M4 tapped holes or M4 threaded inserts before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the various lengths in this listing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAll variants share the same M4 × 0.7 mm thread and knurled head style. The only difference is the threaded shank length, which ranges from 5 mm to 30 mm. Shorter lengths (5–10 mm) suit thin panels and sheet metal; medium lengths (12–16 mm) work for standard bracket thicknesses; longer lengths (20–30 mm) are used when fastening through thicker assemblies or when extra thread engagement is needed.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Thread Dia × Length and quantity 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\": \"Which length should I choose for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select a length that gives at least 1.5× the thread diameter of engagement — for M4, that means a minimum of 6 mm of thread engagement into the tapped hole or nut. Measure your panel or bracket thickness, add any washer stack, and choose the next available length that keeps the screw flush or slightly proud of the mating surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these screws strong enough for structural fastening?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These carbon steel thumb screws are designed for light-duty clamping and panel retention rather than high-load structural joints. They are well-suited for enclosure covers, access panels, jigs, and fixtures where hand-torque levels are appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the nickel plating protect against rust outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The nickel plating provides meaningful corrosion resistance in dry indoor environments and low-humidity conditions. It is not rated for continuous outdoor exposure, salt spray, or high-moisture environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard M4 hex nuts and threaded inserts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The M4 × 0.7 mm thread is the standard coarse pitch for M4 fasteners and mates directly with M4 hex nuts, nylon-insert lock nuts, and M4 threaded inserts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between the different pack quantities?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 5- and 8-piece packs are ideal for single-project use or testing fit. The 10-piece pack suits small batch builds. The 30- and 50-piece packs offer a lower per-unit cost for production runs or workshop stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these in a 3D printer or electronics enclosure?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — M4 knurled thumb screws are widely used in 3D printer frame panels, electronics enclosures, and server rack covers. Confirm your enclosure uses M4 tapped holes or M4 threaded inserts before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the various lengths in this listing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"All variants share the same M4 × 0.7 mm thread and knurled head style. The only difference is the threaded shank length, ranging from 5 mm to 30 mm.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"M4x5mm \/ 5","offer_id":52291493331218,"sku":"GLFBQYF2024JINGLONGWJ0533x5","price":6.91,"currency_code":"USD","in_stock":true},{"title":"M4x5mm \/ 8","offer_id":52291493363986,"sku":"GLFBQYF2024JINGLONGWJ0533x8","price":7.58,"currency_code":"USD","in_stock":true},{"title":"M4x5mm \/ 10","offer_id":52291493396754,"sku":"GLFBQYF2024JINGLONGWJ0533x10","price":9.07,"currency_code":"USD","in_stock":true},{"title":"M4x5mm \/ 30","offer_id":52291493429522,"sku":"GLFBQYF2024JINGLONGWJ0533x30","price":23.0,"currency_code":"USD","in_stock":true},{"title":"M4x5mm \/ 50","offer_id":52291493462290,"sku":"GLFBQYF2024JINGLONGWJ0533x50","price":36.92,"currency_code":"USD","in_stock":true},{"title":"M4x6mm \/ 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