{"product_id":"303-stainless-steel-knurled-flat-head-thumb-screws-m6","title":"303 Stainless Steel Knurled Flat Head Thumb Screws M6x25 30 35mm Hand Screw Bolt","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM6 Knurled Flat Head Thumb Screws in 303 Stainless Steel — Tool-Free Fastening for Panels \u0026amp; Enclosures\u003c\/h2\u003e\n\u003cp\u003eWhen you need a fastener you can tighten and release by hand — repeatedly, without reaching for a tool — standard socket-head bolts become a daily frustration. Engineers, makers, and maintenance technicians who work with access panels, instrument enclosures, and DIY fabrication rigs know the value of a thumb screw that stays put under vibration yet releases instantly when needed.\u003c\/p\u003e\n\u003cp\u003eThese M6 knurled flat head thumb screws are machined from 303 stainless steel and feature a wide, knurled round head for confident finger grip. Available in three shaft lengths — 25 mm (~0.98 in), 30 mm (~1.18 in), and 35 mm (~1.38 in) — with a consistent M6 metric thread pitch throughout. Sold in quantities from 1 to 30 pieces per order to match both prototype and production needs.\u003c\/p\u003e\n\u003cp\u003eTypical applications include securing removable side panels on electronic enclosures, hand-tightening jig fixtures on workbenches, fastening inspection covers on fluid handling equipment, and assembling modular display or rack systems where frequent access is required. The flat head profile sits flush or near-flush against the mating surface, keeping the assembly clean and snag-free.\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 Standard M6 metric thread (1.0 mm pitch). Fits any M6-tapped hole or M6 nut. Verify shaft length against your panel stack-up before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These M6 Knurled Flat Head Thumb Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e303 Stainless Steel Construction\u003c\/strong\u003e — Offers solid corrosion resistance in indoor and light-outdoor environments; resists rust from humidity and incidental moisture exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnurled Round Head for Secure Grip\u003c\/strong\u003e — The circumferential knurl pattern gives fingers reliable purchase even when hands are slightly damp or gloved, reducing slip during tightening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Head Profile\u003c\/strong\u003e — Sits flush or near-flush against the mating surface for a clean, low-profile finish that avoids snagging cables or clothing in tight enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree Shaft Lengths Available\u003c\/strong\u003e — Choose 25 mm, 30 mm, or 35 mm to match your panel thickness and thread engagement requirements without cutting or shimming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M6 Metric Thread\u003c\/strong\u003e — Compatible with any M6-tapped hole or M6 hex nut; no special tooling or adapters required for installation or removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Available from 1 to 30 pieces per order, making it practical to source exact quantities for prototypes, repairs, or small production runs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — M6 Knurled Flat Head Thumb Screws\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e303 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlat Head (Knurled Round)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand \/ Finger (no tool required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.0 mm (standard metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShaft Length Options\u003c\/th\u003e\n\u003ctd\u003e25 mm \/ 30 mm \/ 35 mm\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\u003eSystem of Measurement\u003c\/th\u003e\n\u003ctd\u003eMetric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural (uncoated stainless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 \/ 8 \/ 10 \/ 15 \/ 20 \/ 25 \/ 30 PCS\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 shaft length — 25 mm, 30 mm, or 35 mm?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the total thickness of the panels or materials the screw must pass through, then add at least 5–8 mm for thread engagement in the nut or tapped hole. For example, if your panel stack is 18 mm thick, a 25 mm screw gives approximately 7 mm of engagement — typically sufficient for M6. If you need more engagement or are fastening into a deeper tapped hole, choose 30 mm or 35 mm.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 303 stainless steel strong enough for structural fastening?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e303 stainless steel is a free-machining austenitic alloy with tensile strength typically in the 515–620 MPa range. It is well-suited for light-to-medium clamping loads in enclosures, panels, and jig fixtures. It is not recommended for high-torque structural joints or applications requiring the higher strength of 316 or 410 grades. For thumb screws — which are hand-tightened by definition — 303 is the standard material choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these thumb screws resist corrosion in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e303 stainless steel provides good resistance to atmospheric corrosion and humidity. It performs reliably in indoor environments and sheltered outdoor settings. However, 303 contains sulfur for machinability, which slightly reduces its corrosion resistance compared to 304 or 316. For marine, coastal, or chemically aggressive environments, consider 316 stainless alternatives. Contact us to confirm suitability for your specific conditions.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard M6 nuts and tapped holes?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These screws use a standard M6 × 1.0 mm metric coarse thread, which is the default M6 pitch. They will thread directly into any M6-tapped hole or pair with any standard M6 hex nut, flange nut, or coupling nut without modification.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in applications where the screw is tightened and loosened frequently?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — frequent hand-tightening and release is exactly the use case these thumb screws are designed for. The knurled head provides consistent grip across repeated cycles. For very high-cycle applications (hundreds of insertions), consider applying a small amount of anti-galling lubricant to the threads, as stainless-on-stainless contact can occasionally gall under repeated torque.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide how many pieces to order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCount the number of fastener positions in your assembly, then add 10–15% as spares for prototyping or future repairs. For a single enclosure with 4 access panel screws, a 5-piece order covers the build plus one spare. For production runs or workshop stock, the 20- or 30-piece options offer a lower per-unit cost. All quantity options ship as a single item selection — simply choose your preferred count from the variant selector.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a knurled flat head and a knurled round head thumb screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA flat head thumb screw has a conical underside that seats into a countersunk hole, pulling the fastener flush with the surface — ideal for panels where a protruding head would be a snag hazard. A round (dome) head sits proud of the surface and is used in clearance-hole applications. These screws feature a flat head profile, making them the correct choice for countersunk or flush-mount installations.\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 Thread Dia x 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\": \"How do I choose the right shaft length — 25 mm, 30 mm, or 35 mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total thickness of the panels or materials the screw must pass through, then add at least 5–8 mm for thread engagement in the nut or tapped hole. For example, if your panel stack is 18 mm thick, a 25 mm screw gives approximately 7 mm of engagement — typically sufficient for M6. If you need more engagement or are fastening into a deeper tapped hole, choose 30 mm or 35 mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 303 stainless steel strong enough for structural fastening?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"303 stainless steel is a free-machining austenitic alloy with tensile strength typically in the 515–620 MPa range. It is well-suited for light-to-medium clamping loads in enclosures, panels, and jig fixtures. It is not recommended for high-torque structural joints or applications requiring the higher strength of 316 or 410 grades.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these thumb screws resist corrosion in humid or outdoor environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"303 stainless steel provides good resistance to atmospheric corrosion and humidity. It performs reliably in indoor environments and sheltered outdoor settings. For marine, coastal, or chemically aggressive environments, consider 316 stainless alternatives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard M6 nuts and tapped holes?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These screws use a standard M6 × 1.0 mm metric coarse thread. They will thread directly into any M6-tapped hole or pair with any standard M6 hex nut, flange nut, or coupling nut without modification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these in applications where the screw is tightened and loosened frequently?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — frequent hand-tightening and release is exactly the use case these thumb screws are designed for. The knurled head provides consistent grip across repeated cycles. For very high-cycle applications, consider applying a small amount of anti-galling lubricant to the threads.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide how many pieces to order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Count the number of fastener positions in your assembly, then add 10–15% as spares for prototyping or future repairs. All quantity options ship as a single item selection — simply choose your preferred count from the variant selector.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a knurled flat head and a knurled round head thumb screw?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat head thumb screw has a conical underside that seats into a countersunk hole, pulling the fastener flush with the surface. A round head sits proud of the surface and is used in clearance-hole applications. These screws feature a flat head profile, making them the correct choice for countersunk or flush-mount installations.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"M6x25mm \/ 1PCS","offer_id":52300616007954,"sku":"GLFBTXJ2024JINGLONGWJ1313x1","price":8.61,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 2PCS","offer_id":52300616040722,"sku":"GLFBTXJ2024JINGLONGWJ1313x2","price":13.4,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 3PCS","offer_id":52300616073490,"sku":"GLFBTXJ2024JINGLONGWJ1313x3","price":15.12,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 5PCS","offer_id":52300616106258,"sku":"GLFBTXJ2024JINGLONGWJ1313x5","price":23.94,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 8PCS","offer_id":52300616139026,"sku":"GLFBTXJ2024JINGLONGWJ1313x8","price":37.13,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 10PCS","offer_id":52300616171794,"sku":"GLFBTXJ2024JINGLONGWJ1313x10","price":45.91,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 15PCS","offer_id":52300616204562,"sku":"GLFBTXJ2024JINGLONGWJ1313x15","price":67.92,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 20PCS","offer_id":52300616237330,"sku":"GLFBTXJ2024JINGLONGWJ1313x20","price":89.9,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 25PCS","offer_id":52300616270098,"sku":"GLFBTXJ2024JINGLONGWJ1313x25","price":111.9,"currency_code":"USD","in_stock":false},{"title":"M6x25mm \/ 30PCS","offer_id":52300616302866,"sku":"GLFBTXJ2024JINGLONGWJ1313x30","price":133.91,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 1PCS","offer_id":52300616335634,"sku":"GLFBTXJ2024JINGLONGWJ1314x1","price":8.84,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 2PCS","offer_id":52300616368402,"sku":"GLFBTXJ2024JINGLONGWJ1314x2","price":11.26,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 3PCS","offer_id":52300616401170,"sku":"GLFBTXJ2024JINGLONGWJ1314x3","price":15.94,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 5PCS","offer_id":52300616433938,"sku":"GLFBTXJ2024JINGLONGWJ1314x5","price":25.27,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 8PCS","offer_id":52300616466706,"sku":"GLFBTXJ2024JINGLONGWJ1314x8","price":39.28,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 10PCS","offer_id":52300616499474,"sku":"GLFBTXJ2024JINGLONGWJ1314x10","price":48.61,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 15PCS","offer_id":52300616532242,"sku":"GLFBTXJ2024JINGLONGWJ1314x15","price":71.97,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 20PCS","offer_id":52300616565010,"sku":"GLFBTXJ2024JINGLONGWJ1314x20","price":95.31,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 25PCS","offer_id":52300616597778,"sku":"GLFBTXJ2024JINGLONGWJ1314x25","price":118.65,"currency_code":"USD","in_stock":false},{"title":"M6x30mm \/ 30PCS","offer_id":52300616630546,"sku":"GLFBTXJ2024JINGLONGWJ1314x30","price":141.98,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 1PCS","offer_id":52300616663314,"sku":"GLFBTXJ2024JINGLONGWJ1315x1","price":9.08,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 2PCS","offer_id":52300616696082,"sku":"GLFBTXJ2024JINGLONGWJ1315x2","price":11.83,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 3PCS","offer_id":52300616728850,"sku":"GLFBTXJ2024JINGLONGWJ1315x3","price":16.78,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 5PCS","offer_id":52300616761618,"sku":"GLFBTXJ2024JINGLONGWJ1315x5","price":26.66,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 8PCS","offer_id":52300616794386,"sku":"GLFBTXJ2024JINGLONGWJ1315x8","price":41.51,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 10PCS","offer_id":52300616827154,"sku":"GLFBTXJ2024JINGLONGWJ1315x10","price":51.38,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 15PCS","offer_id":52300616859922,"sku":"GLFBTXJ2024JINGLONGWJ1315x15","price":76.13,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 20PCS","offer_id":52300616892690,"sku":"GLFBTXJ2024JINGLONGWJ1315x20","price":100.86,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 25PCS","offer_id":52300616925458,"sku":"GLFBTXJ2024JINGLONGWJ1315x25","price":125.58,"currency_code":"USD","in_stock":false},{"title":"M6x35mm \/ 30PCS","offer_id":52300616958226,"sku":"GLFBTXJ2024JINGLONGWJ1315x30","price":150.31,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_0499e508-10e1-4ae4-a145-c88abb3d6212.jpg?v=1782097142","url":"https:\/\/homediyer.com\/products\/303-stainless-steel-knurled-flat-head-thumb-screws-m6","provider":"HomeDIYer","version":"1.0","type":"link"}