{"product_id":"brass-knurled-thumb-screws-m3-m4-m5-m6-m8-m10","title":"Brass Knurled Thumb Screws M3 M4 M5 M6 M8 M10 — High-Type Hand Grip Knob Bolts","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBrass Knurled Thumb Screws — Tool-Free Hand Grip for Panels, Fixtures \u0026amp; Instruments\u003c\/h2\u003e\n\u003cp\u003eIf you've ever struggled to tighten or loosen a fastener in a tight space without a screwdriver, brass knurled thumb screws are the solution. Engineers, makers, and technicians who work with enclosures, instrument panels, jigs, and 3D printer frames rely on hand-grip knob bolts to make frequent adjustments fast and frustration-free.\u003c\/p\u003e\n\u003cp\u003eEach screw is machined from solid brass with a tall, high-type knurled head designed for confident finger grip. Available in thread sizes M3, M4, M5, M6, M8, and M10, with lengths ranging from 6mm (≈1\/4\") to 50mm (≈2\"). Head diameters range from 9.5mm on M3\/M4 sizes up to 20mm on M8\/M10 sizes. Choose from pack quantities of 2, 5, 10, 20, or 50 pieces to match your project scale.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include securing access panels on electronic enclosures, adjusting fixtures on CNC and 3D printer frames, fastening instrument covers in lab equipment, and assembling quick-release jigs in woodworking or metalworking shops — anywhere you need a metric hand-tightened knob bolt that can be removed and reinstalled without tools.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Metric ISO thread standard (M3–M10). Requires a matching metric nut, threaded insert, or tapped hole. Not compatible with UNC\/UNF imperial threads. Verify your mating thread before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Brass Knurled Thumb Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✋\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTool-Free Hand Tightening\u003c\/strong\u003e — The tall high-type knurled head provides a firm finger grip, making these hand-tightened knob bolts ideal for panels and enclosures that need frequent access.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔶\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e — Machined from brass for natural corrosion resistance, a clean appearance, and non-magnetic properties — well suited for electronics and instrument enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range M3–M10\u003c\/strong\u003e — Covers the most common metric thread sizes used in DIY, maker, and light industrial applications, from compact M3 screws for electronics to M10 for heavier fixture work.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 2, 5, 10, 20, or 50-piece packs so you can order exactly what your project requires without overstocking.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eKnurled Head for Positive Grip\u003c\/strong\u003e — The circumferential knurling pattern on the head prevents finger slip during tightening, even in awkward positions or with slightly damp hands.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eConsistent Metric ISO Threading\u003c\/strong\u003e — Standard metric pitch threading ensures compatibility with off-the-shelf metric nuts, threaded inserts, and tapped holes used in 3D printer frames, CNC fixtures, and panel assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Brass Knurled Thumb Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eHigh-type knurled (tall knurled knob)\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\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric ISO (M3, M4, M5, M6, M8, M10)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Sizes Available\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8, M10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e6mm (≈1\/4\") to 50mm (≈2\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter — M3 \/ M4\u003c\/th\u003e\n\u003ctd\u003e9.5mm (≈3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter — M5\u003c\/th\u003e\n\u003ctd\u003e12mm (≈15\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter — M6 (larger variants)\u003c\/th\u003e\n\u003ctd\u003e14mm (≈9\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter — M8 \/ M10\u003c\/th\u003e\n\u003ctd\u003e20mm (≈25\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2pc, 5pc, 10pc, 20pc, 50pc — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (unlacquered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eStandard metric coarse pitch — see variant options to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003ePanels, enclosures, jigs, fixtures, 3D printer frames, instruments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options or contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e Head diameter varies by thread size. Please check the variant name carefully before ordering to confirm the head diameter matches your application.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my brass knurled thumb screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGenerally, the screw length should equal the thickness of the material being fastened plus enough thread engagement — typically 1.5× the thread diameter. For example, an M4 screw typically needs at least 6mm of thread engagement. If you're working in inches, 6mm ≈ 1\/4\" and 16mm ≈ 5\/8\". When in doubt, choose a slightly longer screw and use a washer to fine-tune the clamping depth.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are brass knurled thumb screws compared to steel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass is generally softer than steel, so these thumb screws are best suited for light-duty hand-tightened applications — panel assembly, instrument enclosures, jigs, and fixtures. They are not intended for high-torque or structural load-bearing connections. For heavy-duty clamping, a steel thumb screw would typically be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these brass thumb screws outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass has naturally good corrosion resistance and performs well in mildly humid or indoor environments. For prolonged outdoor exposure or marine conditions, brass generally holds up better than plain steel but may develop a patina over time. If appearance is critical in outdoor use, consider applying a protective coating or using stainless steel alternatives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these thumb screws use — metric or imperial?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are metric thread thumb screws following the ISO metric standard (M3, M4, M5, M6, M8, M10). They are not compatible with UNC\/UNF imperial threads. Make sure your mating nut or threaded insert is also metric before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a tool to install these knurled thumb screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo tool is required. The high-type knurled head is specifically designed for finger-tightening, providing a secure grip without a screwdriver or wrench. This makes them ideal for applications that require frequent adjustment or removal by hand.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich size should I choose — M3, M4, M5, M6, M8, or M10?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eChoose based on the thread size of your existing hole or nut. M3 and M4 are typically used in electronics, small enclosures, and precision instruments. M5 and M6 are common in light machinery, 3D printer frames, and panel work. M8 and M10 are generally used for heavier fixtures, jigs, and structural panels. Check your mating thread before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the head diameter for each size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHead diameters vary by thread size: M3 and M4 have a 9.5mm head diameter; M5 has a 12mm head diameter; M6 (larger variants) have a 14mm head diameter; M8 and M10 have a 20mm head diameter. Please refer to the variant options for the exact head diameter of your selected size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3*6mm（Head Diamter: 9.5） \/ 2pc","offer_id":52293058920722,"sku":"AdaahAKBB3503x2","price":2.68,"currency_code":"USD","in_stock":true},{"title":"M3*6mm（Head Diamter: 9.5） \/ 10pc","offer_id":52293058953490,"sku":"AdaahAKBB3503x10","price":4.77,"currency_code":"USD","in_stock":true},{"title":"M3*6mm（Head Diamter: 9.5） \/ 20pc","offer_id":52293058986258,"sku":"AdaahAKBB3503x20","price":8.01,"currency_code":"USD","in_stock":true},{"title":"M3*6mm（Head Diamter: 9.5） \/ 50pc","offer_id":52293059019026,"sku":"AdaahAKBB3503x50","price":16.92,"currency_code":"USD","in_stock":true},{"title":"M3*8mm（Head Diamter: 9.5） \/ 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