{"product_id":"m3-knurled-thumb-screws-303-stainless","title":"M3 x 18\/25\/30mm Knurled Thumb Screws – 303 Stainless Steel Hand Grip Bolts","description":"\u003cstyle\u003e\n  \/* 统一前缀 hdiy-，避免样式冲突 *\/\n  .hdiy-product-wrap {\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-wrap h2,\n  .hdiy-product-wrap h3 {\n    margin-top: 1.5em;\n    margin-bottom: 0.5em;\n    font-weight: 600;\n  }\n  .hdiy-product-wrap p {\n    margin-bottom: 1em;\n    line-height: 1.5;\n  }\n  .hdiy-features-list {\n    list-style: none;\n    padding-left: 0;\n  }\n  .hdiy-features-list li {\n    margin-bottom: 0.75em;\n    padding-left: 1.5em;\n    position: relative;\n    line-height: 1.4;\n  }\n  .hdiy-features-list li::before {\n    content: \" \";\n    position: absolute;\n    left: 0;\n    top: 0;\n  }\n  .hdiy-table-wrapper {\n    overflow-x: auto;\n    margin: 1.2em 0;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n    background: #fff;\n    min-width: 300px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    width: 35%;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.25rem;\n    border-bottom: 1px solid #eee;\n    padding-bottom: 0.75rem;\n  }\n  .hdiy-faq-question {\n    font-weight: 700;\n    margin-bottom: 0.35rem;\n    font-size: 1rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0;\n    line-height: 1.45;\n    color: #2c2c2c;\n  }\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n\u003c!-- Product Overview --\u003e\n\u003ch2\u003e🔧 Product Overview: M3 x 18\/25\/30mm Knurled Thumb Screws – 303 Stainless Steel Hand Grip Bolts\u003c\/h2\u003e\n\u003cp\u003eFor tool‑less fastening that combines a secure grip with excellent corrosion resistance, these 303 stainless steel knurled thumb screws are an ideal choice. The flat, knurled head provides a non‑slip surface for hand tightening and loosening – no screwdriver or wrench needed. Made from 303 stainless steel, they offer good machinability and corrosion resistance, making them suitable for both indoor and outdoor applications. Available in M3 thread size with three length options: 18mm, 25mm, and 30mm (measured under the head). Fully threaded with standard coarse pitch (0.5mm). Perfect for machinery access panels, 3D printers, camera rigs, and DIY projects.\u003c\/p\u003e\n\u003c!-- Key Features List --\u003e\n\u003ch2\u003e✨ Why These Stainless Steel Knurled Thumb Screws Are a Workshop Essential\u003c\/h2\u003e\n\u003cul class=\"hdiy-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e303 stainless steel construction\u003c\/strong\u003e – Good corrosion resistance, excellent machinability, and moderate strength. Ideal for applications where rust is a concern.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat knurled head for tool‑less grip\u003c\/strong\u003e – Diamond knurl pattern provides a secure, non‑slip surface for hand tightening and loosening – no tools required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM3 metric thread – fully threaded\u003c\/strong\u003e – Standard coarse pitch (0.5mm) runs the entire length for maximum grip and easy nut engagement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree length options: 18mm, 25mm, 30mm\u003c\/strong\u003e – Choose the right thread length for your panel thickness or assembly depth. Length measured under the head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 5 strength\u003c\/strong\u003e – Reliable for general fastening in electronics, machinery, and DIY applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade to GB standard\u003c\/strong\u003e – Consistent quality and precise dimensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide applications\u003c\/strong\u003e – Machinery, 3D printer bed leveling knobs, camera rigs, electronic enclosures, and general assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table --\u003e\n\u003ch2\u003e📏 Technical Specifications – M3 Knurled Thumb Screws (18\/25\/30mm)\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eKnurled Thumb Screws (Hand Grip Bolts)\u003c\/td\u003e\n\u003c\/tr\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\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.5mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Length Options (under head)\u003c\/th\u003e\n\u003ctd\u003e18mm, 25mm, 30mm (select from options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Measurement\u003c\/th\u003e\n\u003ctd\u003eUnder head – from underside of head to tip (head not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlat knurled head (diamond knurl pattern)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHand grip (toolless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eGrade 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eGB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Frequently Asked Questions --\u003e\n\u003ch2\u003e❓ FAQs – 303 Stainless Knurled Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the difference between 303 and 304 stainless steel?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003e303 stainless contains added sulfur for improved machinability, making it easier to produce precision parts. It has slightly lower corrosion resistance than 304 but is still excellent for most indoor and light outdoor applications. For saltwater or heavy chemical exposure, 316 stainless is recommended.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Which length should I choose – 18mm, 25mm, or 30mm?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThread length is measured from under the head to the tip. For panel thickness up to 15mm, choose 18mm. For thicker panels (15‑22mm), choose 25mm. For panels up to 27mm or when using a nut with extra engagement, choose 30mm. Measure your total material thickness and add 2‑3mm for proper thread engagement.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws fully threaded? What is the thread pitch?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – fully threaded from under the head to the tip. The pitch is standard M3 coarse: 0.5mm.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they for tapped holes only?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they work with matching M3 nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The knurled head is for hand grip only – do not use tools on the knurling.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will 303 stainless steel rust?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003e303 stainless offers good corrosion resistance for most indoor and outdoor environments. It will not rust under normal conditions. For continuous saltwater exposure, 316 stainless is a better choice. For general use, 303 is perfectly adequate.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 How many screws come in a pack?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eQuantity varies – please select the desired quantity from the dropdown options. You can order individual screws or in bulk.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3x18 \/ 1 Pcs","offer_id":52292662952210,"sku":"GLFBZWYJLWJ00013x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 3 Pcs","offer_id":52292662984978,"sku":"GLFBZWYJLWJ00013x3","price":9.02,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 4 Pcs","offer_id":52292663017746,"sku":"GLFBZWYJLWJ00013x4","price":10.17,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 5 Pcs","offer_id":52292663050514,"sku":"GLFBZWYJLWJ00013x5","price":11.19,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 10 Pcs","offer_id":52292663083282,"sku":"GLFBZWYJLWJ00013x10","price":13.57,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 20 Pcs","offer_id":52292663116050,"sku":"GLFBZWYJLWJ00013x20","price":23.64,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 30 Pcs","offer_id":52292663148818,"sku":"GLFBZWYJLWJ00013x30","price":34.41,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 50 Pcs","offer_id":52292663181586,"sku":"GLFBZWYJLWJ00013x50","price":56.0,"currency_code":"USD","in_stock":true},{"title":"M3x18 \/ 100 Pcs","offer_id":52292663214354,"sku":"GLFBZWYJLWJ00013x100","price":110.13,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 1 Pcs","offer_id":52292663247122,"sku":"GLFBZWYJLWJ00014x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 3 Pcs","offer_id":52292663279890,"sku":"GLFBZWYJLWJ00014x3","price":9.49,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 4 Pcs","offer_id":52292663312658,"sku":"GLFBZWYJLWJ00014x4","price":10.85,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 5 Pcs","offer_id":52292663345426,"sku":"GLFBZWYJLWJ00014x5","price":12.21,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 10 Pcs","offer_id":52292663378194,"sku":"GLFBZWYJLWJ00014x10","price":14.93,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 20 Pcs","offer_id":52292663410962,"sku":"GLFBZWYJLWJ00014x20","price":27.06,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 30 Pcs","offer_id":52292663443730,"sku":"GLFBZWYJLWJ00014x30","price":39.68,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 50 Pcs","offer_id":52292663476498,"sku":"GLFBZWYJLWJ00014x50","price":64.71,"currency_code":"USD","in_stock":true},{"title":"M3x25 \/ 100 Pcs","offer_id":52292663509266,"sku":"GLFBZWYJLWJ00014x100","price":127.7,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 1 Pcs","offer_id":52292663542034,"sku":"GLFBZWYJLWJ00015x1","price":7.11,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 3 Pcs","offer_id":52292663574802,"sku":"GLFBZWYJLWJ00015x3","price":10.38,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 4 Pcs","offer_id":52292663607570,"sku":"GLFBZWYJLWJ00015x4","price":11.87,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 5 Pcs","offer_id":52292663640338,"sku":"GLFBZWYJLWJ00015x5","price":13.44,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 10 Pcs","offer_id":52292663673106,"sku":"GLFBZWYJLWJ00015x10","price":17.11,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 20 Pcs","offer_id":52292663705874,"sku":"GLFBZWYJLWJ00015x20","price":31.8,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 30 Pcs","offer_id":52292663738642,"sku":"GLFBZWYJLWJ00015x30","price":46.76,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 50 Pcs","offer_id":52292663771410,"sku":"GLFBZWYJLWJ00015x50","price":76.57,"currency_code":"USD","in_stock":true},{"title":"M3x30 \/ 100 Pcs","offer_id":52292663804178,"sku":"GLFBZWYJLWJ00015x100","price":151.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-02_6d7a3d7d-fae1-460b-9df2-762d9c35fc85.jpg?v=1780502659","url":"https:\/\/homediyer.com\/products\/m3-knurled-thumb-screws-303-stainless","provider":"HomeDIYer","version":"1.0","type":"link"}