{"product_id":"m3-m4-knurled-thumb-screws-thin-type-silver-black","title":"10PCS M3 M4 X 5-12MM KNURLED THUMB SCREWS THIN TYPE SILVER BLACK HAND KNOB BOLTS","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM3 \u0026amp; M4 Knurled Thumb Screws — Tool-Free Fastening for Precision Builds\u003c\/h2\u003e\n\u003cp\u003eMakers, electronics assemblers, and 3D-printer builders know the frustration of reaching for a screwdriver every time a panel needs to be opened or a bracket repositioned. These M3 M4 knurled thumb screws are designed for exactly those situations — wherever repeated hand-tightening is needed without sacrificing a secure hold.\u003c\/p\u003e\n\u003cp\u003eEach set contains 10 pieces of thin-type knurled thumb screws machined from carbon steel with a zinc-plated finish (silver) or a black oxide coating (black). Thread diameters cover M3 and M4, with thread lengths ranging from 5 mm to 12 mm (~0.20\"–0.47\"). The head diameter is 10 mm or 13 mm with a uniform 6 mm head height, providing a low-profile grip surface that fits in tight enclosures.\u003c\/p\u003e\n\u003cp\u003eTypical applications include securing access panels on DIY electronics enclosures, adjusting jigs and fixtures on CNC routers and laser cutters, fastening 3D-printer frame components that require frequent reconfiguration, and hand-tightening camera rig accessories or optical bench mounts.\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 M3 and M4 metric threaded holes. Verify thread pitch (M3 × 0.5 mm, M4 × 0.7 mm standard coarse) matches your application before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These M3 M4 Knurled Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✋\u003c\/span\u003e\u003cstrong\u003eKnurled Grip Head\u003c\/strong\u003e\u003cbr\u003eCircumferential knurling on the head provides reliable finger traction even with light oil or dust present, reducing slip during hand-tightening.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eThin-Type Low-Profile Head\u003c\/strong\u003e\u003cbr\u003e6 mm head height keeps the fastener flush-friendly in shallow clearance zones — ideal for stacked PCB standoffs and slim panel assemblies.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eM3 \u0026amp; M4 Thread Coverage\u003c\/strong\u003e\u003cbr\u003eAvailable in M3 × 6\/8\/10\/12 mm and M4 × 5\/6\/8\/10\/12 mm thread lengths, covering the most common metric sizes used in electronics and light mechanical assemblies.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cstrong\u003eTwo Finish Options\u003c\/strong\u003e\u003cbr\u003eSilver (zinc-plated) offers corrosion resistance for general indoor use; Black (black oxide) provides a low-reflectance finish suited to optical setups and dark-panel aesthetics.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003e10-Piece Pack\u003c\/strong\u003e\u003cbr\u003eEach order ships as a 10-piece set, giving you enough fasteners to outfit a full enclosure or keep spares on hand for future builds.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eReusable \u0026amp; Tool-Free\u003c\/strong\u003e\u003cbr\u003eCarbon steel construction withstands repeated tightening and loosening cycles without thread deformation, making these suitable for panels opened regularly during prototyping or maintenance.\u003c\/div\u003e\n\u003c\/div\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\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric (M3, M4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3 (3 mm \/ 0.118\") or M4 (4 mm \/ 0.157\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Length Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 12 mm (0.20\" – 0.47\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM3 × 0.5 mm coarse; M4 × 0.7 mm coarse (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eThin-type knurled thumb head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003e10 mm or 13 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Height\u003c\/th\u003e\n\u003ctd\u003e6 mm (0.236\")\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\u003eFinish \/ Colour\u003c\/th\u003e\n\u003ctd\u003eZinc-plated silver or Black oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e10 pieces\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\u003eAvailable Variants\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct thread length for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the total thickness of the material being clamped, then add 1–2 mm for thread engagement beyond the material. For example, if your panel is 4 mm thick and sits against a 3 mm nut plate, choose a thread length of at least 7 mm. Longer threads provide more engagement strength but may protrude further on the back side.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 10 mm and 13 mm head diameter options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 10 mm head fits in tighter clearance zones and is the standard choice for most electronics enclosures and 3D-printer frames. The 13 mm head offers a larger grip surface, making it easier to tighten in applications where more torque is needed by hand, such as securing heavier brackets or thicker panels.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these thumb screws strong enough for structural fastening?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese are designed for light-duty to medium-duty clamping where hand-tightening torque is sufficient — typically panels, covers, jigs, and adjustable fixtures. They are not intended as structural bolts in high-load or vibration-intensive environments. For critical structural joints, use a hex-head bolt with a torque wrench.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the silver finish resist rust in a workshop environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe zinc-plated silver finish provides moderate corrosion resistance suitable for dry indoor workshop conditions. Prolonged exposure to moisture, cutting fluids, or outdoor environments may cause surface oxidation over time. For humid or wet environments, consider applying a light coat of machine oil or contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these with standard metric nuts and threaded inserts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. M3 variants are compatible with standard M3 × 0.5 mm coarse-pitch nuts, threaded inserts, and tapped holes. M4 variants work with M4 × 0.7 mm coarse-pitch hardware. Always verify the pitch of your existing threaded holes before ordering, as fine-pitch variants exist and are not interchangeable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many times can these be tightened and loosened before wearing out?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel thumb screws of this type typically withstand hundreds of tightening cycles under normal hand-torque loads without measurable thread wear. Wear rate increases if the mating thread is softer material (e.g., aluminium or plastic). If used in plastic tapped holes, consider adding a brass threaded insert to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the best use case for the black oxide finish?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide is preferred in optical and photographic setups where reflective fasteners would cause unwanted glare, in dark-panel electronics builds for a uniform aesthetic, and in situations where a non-reflective surface is specified. Note that black oxide provides less corrosion resistance than zinc plating and benefits from a light oil coating in humid conditions.\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 × Thread Length, Head Dia., and Colour 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 correct thread length for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total thickness of the material being clamped, then add 1–2 mm for thread engagement beyond the material. For example, if your panel is 4 mm thick and sits against a 3 mm nut plate, choose a thread length of at least 7 mm. Longer threads provide more engagement strength but may protrude further on the back side.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 10 mm and 13 mm head diameter options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 10 mm head fits in tighter clearance zones and is the standard choice for most electronics enclosures and 3D-printer frames. The 13 mm head offers a larger grip surface, making it easier to tighten in applications where more torque is needed by hand, such as securing heavier brackets or thicker panels.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these thumb screws strong enough for structural fastening?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are designed for light-duty to medium-duty clamping where hand-tightening torque is sufficient — typically panels, covers, jigs, and adjustable fixtures. They are not intended as structural bolts in high-load or vibration-intensive environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the silver finish resist rust in a workshop environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc-plated silver finish provides moderate corrosion resistance suitable for dry indoor workshop conditions. Prolonged exposure to moisture, cutting fluids, or outdoor environments may cause surface oxidation over time.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these with standard metric nuts and threaded inserts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. M3 variants are compatible with standard M3 × 0.5 mm coarse-pitch nuts, threaded inserts, and tapped holes. M4 variants work with M4 × 0.7 mm coarse-pitch hardware.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many times can these be tightened and loosened before wearing out?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel thumb screws of this type typically withstand hundreds of tightening cycles under normal hand-torque loads without measurable thread wear. Wear rate increases if the mating thread is softer material such as aluminium or plastic.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the best use case for the black oxide finish?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide is preferred in optical and photographic setups where reflective fasteners would cause unwanted glare, in dark-panel electronics builds for a uniform aesthetic, and in situations where a non-reflective surface is specified.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"M3 x 6 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815014674,"sku":"PENG094745x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 8 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815047442,"sku":"PENG094746x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 10 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815080210,"sku":"PENG094747x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 12 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815112978,"sku":"PENG094748x1","price":8.77,"currency_code":"USD","in_stock":true},{"title":"M4 x 5 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815145746,"sku":"PENG094749x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M4 x 8 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815178514,"sku":"PENG094750x1","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M4 x 10 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815211282,"sku":"PENG094751x1","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M4 x 12 mm \/ 10 x 6 mm \/ Silver","offer_id":52291815244050,"sku":"PENG094752x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"M3 x 6 mm \/ 10 x 6 mm \/ Black","offer_id":52291815276818,"sku":"PENG094753x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 8 mm \/ 10 x 6 mm \/ Black","offer_id":52291815309586,"sku":"PENG094754x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 10 mm \/ 10 x 6 mm \/ Black","offer_id":52291815342354,"sku":"PENG094755x1","price":6.87,"currency_code":"USD","in_stock":true},{"title":"M3 x 12 mm \/ 10 x 6 mm \/ Black","offer_id":52291815375122,"sku":"PENG094756x1","price":8.77,"currency_code":"USD","in_stock":true},{"title":"M4 x 6 mm \/ 10 x 6 mm \/ Black","offer_id":52291815407890,"sku":"PENG094757x1","price":7.0,"currency_code":"USD","in_stock":true},{"title":"M4 x 8 mm \/ 10 x 6 mm \/ Black","offer_id":52291815440658,"sku":"PENG094758x1","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M4 x 10 mm \/ 10 x 6 mm \/ Black","offer_id":52291815473426,"sku":"PENG094759x1","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M4 x 12 mm \/ 10 x 6 mm \/ Black","offer_id":52291815506194,"sku":"PENG094760x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"M4 x 8 mm \/ 13 x 6 mm \/ Black","offer_id":52291815538962,"sku":"PENG094761x1","price":11.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of7_e6dda5aa-5051-43c2-9a0e-d010e216e16e.jpg?v=1781924165","url":"https:\/\/homediyer.com\/de\/products\/m3-m4-knurled-thumb-screws-thin-type-silver-black","provider":"HomeDIYer","version":"1.0","type":"link"}