{"product_id":"thumb-screws-m8-hand-knob-bolts-plastic-five-star-head-black-length-20-80mm","title":"Thumb Screws M8 Hand Knob Bolts Plastic Five-Star Head Black Length 20-80mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM8 Thumb Screws with Five-Star Knob Head — Tool-Free Fastening for Jigs, Fixtures \u0026amp; Enclosures\u003c\/h2\u003e\n    \u003cp\u003eWhen you need to adjust, remove, or reposition a panel or fixture repeatedly without reaching for a wrench, standard hex bolts become a genuine bottleneck. These M8 thumb screws with a five-star plastic knob head are designed for makers, machinists, and workshop builders who need fast, repeatable hand-tightening in tight spaces or on frequently accessed assemblies.\u003c\/p\u003e\n    \u003cp\u003eEach bolt consists of a black five-star plastic knob bonded to a carbon steel M8 threaded shank. Available in 11 lengths from 20 mm (approx. 0.79 in) to 80 mm (approx. 3.15 in), with a standard M8 × 1.25 mm metric thread pitch. Sold in packs of 1, 3, 5, or 10 pieces so you can match quantity to your project scope.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include woodworking jig clamping knobs, 3D printer enclosure panels, CNC machine guard fasteners, electrical cabinet access covers, and DIY workbench stop blocks — anywhere a tool-free M8 hand knob bolt speeds up your workflow.\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 any M8 × 1.25 mm tapped hole or M8 nut. Verify thread depth against your chosen length before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These M8 Five-Star Hand Knob Bolts\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 — Five-star knob profile distributes finger force evenly, allowing firm hand-tightening without a wrench or driver.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eWide length selection\u003c\/strong\u003e — Eleven sizes from 20 mm to 80 mm (0.79–3.15 in) cover shallow panel fastening through deep-reach clamping applications.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eStandard M8 × 1.25 mm thread\u003c\/strong\u003e — Metric coarse pitch compatible with the vast majority of M8 tapped holes, inserts, and nuts used in workshop and industrial assemblies.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧱\u003c\/span\u003e \u003cstrong\u003eComposite construction\u003c\/strong\u003e — Carbon steel shank provides tensile strength; black plastic knob resists oils and light solvents common in workshop environments.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e \u003cstrong\u003eUniform black finish\u003c\/strong\u003e — Consistent matte black colour on both knob and shank suits professional-looking enclosures, instrument panels, and machine guards.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible pack quantities\u003c\/strong\u003e — Available in 1, 3, 5, or 10-piece packs; order exactly what you need for a single build or stock your parts bin for ongoing projects.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — M8 Thumb Screw \/ Hand Knob Bolt\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.25 mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e20 mm – 80 mm (0.79 in – 3.15 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e20, 25, 30, 35, 40, 45, 50, 60, 65, 70, 80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFive-Star Knob (hand knob)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eManual (tool-free)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKnob Material\u003c\/th\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShank Material\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eColour \/ Finish\u003c\/th\u003e\n\u003ctd\u003eBlack\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\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 3 pcs \/ 5 pcs \/ 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKnob Outer Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight per Piece\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\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich length should I choose for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the total grip length — the combined thickness of all materials the bolt must pass through — then add at least 10–15 mm for thread engagement in the nut or tapped hole. For example, a 12 mm panel fastened into a 15 mm tapped block needs a minimum of 27 mm of thread; the M8×30mm variant is the closest safe choice.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong is the carbon steel shank compared to a standard hex bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe carbon steel shank offers comparable tensile strength to a standard Grade 4.8 metric bolt for light-to-medium clamping loads. These thumb screws are designed for hand-tightened assemblies — jigs, guards, access panels — not for high-torque structural joints. If your application requires a specific proof load, contact us to confirm suitability.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts corrosion-resistant for outdoor or humid environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe carbon steel shank has a standard black finish that provides limited corrosion resistance. For outdoor exposure or consistently humid environments (e.g., marine, food processing), consider applying a corrosion-inhibiting coating or contact us to confirm if a stainless variant is available. The plastic knob itself is unaffected by moisture.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these fit my existing M8 tapped holes and T-nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the M8 × 1.25 mm metric coarse thread is the global standard for M8 fasteners and is compatible with the overwhelming majority of M8 tapped holes, weld nuts, T-slot nuts, and threaded inserts used in aluminium extrusion systems (e.g., 20-series, 30-series, 40-series profiles) and steel fabrications.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these as replacement knobs on my 3D printer or CNC machine?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese are a popular choice for 3D printer bed levelling knobs, enclosure panel fasteners, and CNC machine guard bolts where the original hardware requires a tool to remove. Confirm that your existing fastener is M8 × 1.25 mm and select a length that matches your current bolt's grip length. The five-star profile provides good finger grip even with gloves.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I decide between buying 1, 3, 5, or 10 pieces?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a single repair or prototype, the 1-piece pack is the most economical entry point. For a typical four-corner panel or jig with a spare, the 5-piece pack offers the best per-unit value. The 10-piece pack suits production runs, stocking a parts bin, or builds with multiple access panels. Per-unit cost decreases with larger pack quantities.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the knob outer diameter, and will it clear my surrounding hardware?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe exact knob outer diameter varies slightly by length variant. As a conservative estimate, five-star M8 knobs of this type typically measure 35–45 mm across the widest point of the star. If clearance is critical, please contact us to confirm the exact dimension for your chosen length before ordering.\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 Size and Pack Qty 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\": \"Measure the total grip length — the combined thickness of all materials the bolt must pass through — then add at least 10–15 mm for thread engagement in the nut or tapped hole. For example, a 12 mm panel fastened into a 15 mm tapped block needs a minimum of 27 mm of thread; the M8×30mm variant is the closest safe choice.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is the carbon steel shank compared to a standard hex bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The carbon steel shank offers comparable tensile strength to a standard Grade 4.8 metric bolt for light-to-medium clamping loads. These thumb screws are designed for hand-tightened assemblies — jigs, guards, access panels — not for high-torque structural joints.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts corrosion-resistant for outdoor or humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The carbon steel shank has a standard black finish that provides limited corrosion resistance. For outdoor exposure or consistently humid environments, consider applying a corrosion-inhibiting coating. The plastic knob itself is unaffected by moisture.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these fit my existing M8 tapped holes and T-nuts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the M8 × 1.25 mm metric coarse thread is compatible with the vast majority of M8 tapped holes, weld nuts, T-slot nuts, and threaded inserts used in aluminium extrusion systems and steel fabrications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these as replacement knobs on my 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are a popular choice for 3D printer bed levelling knobs, enclosure panel fasteners, and CNC machine guard bolts. Confirm that your existing fastener is M8 × 1.25 mm and select a length that matches your current bolt's grip length.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I decide between buying 1, 3, 5, or 10 pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a single repair or prototype, the 1-piece pack is the most economical entry point. For a typical four-corner panel or jig with a spare, the 5-piece pack offers the best per-unit value. The 10-piece pack suits production runs or stocking a parts bin.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the knob outer diameter, and will it clear my surrounding hardware?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Five-star M8 knobs of this type typically measure 35–45 mm across the widest point of the star. If clearance is critical, please contact us to confirm the exact dimension for your chosen length before ordering.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"M8x20mm \/ 1 pcs","offer_id":52300484870418,"sku":"GLFBNHHGLBZSJ094677x1","price":5.56,"currency_code":"USD","in_stock":false},{"title":"M8x25mm \/ 1 pcs","offer_id":52300484903186,"sku":"GLFBNHHGLBZSJ094678x1","price":5.64,"currency_code":"USD","in_stock":false},{"title":"M8x30mm \/ 1 pcs","offer_id":52300484935954,"sku":"GLFBNHHGLBZSJ094679x1","price":5.78,"currency_code":"USD","in_stock":false},{"title":"M8x35mm \/ 1 pcs","offer_id":52300484968722,"sku":"GLFBNHHGLBZSJ094680x1","price":5.83,"currency_code":"USD","in_stock":false},{"title":"M8x40mm \/ 1 pcs","offer_id":52300485001490,"sku":"GLFBNHHGLBZSJ094681x1","price":5.97,"currency_code":"USD","in_stock":false},{"title":"M8x45mm \/ 1 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