{"product_id":"m4-t-bolts-t-slot-aluminum-extrusion-square-head-stainless-steel-304","title":"M4 T-Bolts for T-Slot Aluminum Extrusion — Square Head Stainless Steel 304 (A2), M4×12mm to M4×30mm","description":"\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 bolt length for my T-slot profile?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total stack thickness of the parts you are clamping, then add the thread engagement depth — typically 1.5× the bolt diameter for steel nuts. For M4 bolts, that is generally 6mm of thread engagement. So for a 10mm plate, an M4×16mm (≈5\/8\\u201d) bolt is typically the right choice. When in doubt, size up one increment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What clamping load can these M4 T-bolts handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade A2 (304) stainless steel M4 bolts have a proof load of approximately 3.2 kN and a tensile strength of generally 500–700 MPa. Actual clamping force depends on torque applied and lubrication. For structural T-slot frames, always verify load requirements against your specific profile manufacturer's data.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts suitable for outdoor or corrosive environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 304 stainless steel (A2) provides good resistance to atmospheric corrosion, moisture, and mild chemicals. It is generally suitable for outdoor use, light marine environments, and food-adjacent applications. For highly chloride-rich or saltwater environments, 316 (A4) stainless is typically recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which T-slot profile sizes are these bolts compatible with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These M4 square head T-bolts are designed to slide into the T-slot channel of standard aluminum extrusion profiles — typically 20-series (20×20, 20×40, 20×60) and 30-series profiles with a 6mm slot width. Always verify your profile's slot width and nut channel dimensions before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these T-bolts require a special nut or can I use standard M4 nuts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square head is designed to lock into the T-slot channel of aluminum extrusion profiles, so no separate T-nut is needed on the bolt head side. On the clamping side, standard M4 hex nuts, flange nuts, or T-nuts can be used depending on your assembly design.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many bolts should I order for a typical CNC router or 3D printer frame build?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A typical 3D printer or small CNC frame build uses anywhere from 20 to 80 T-bolts depending on the number of joints and accessories. For a first build, ordering a 50-pack of your primary length gives you spares for adjustments. For production or workshop use, the 100- or 200-piece options offer the best per-unit value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the thread pitch for these M4 bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M4 bolts use a standard metric coarse thread pitch of 0.7mm per the ISO 68-1 standard. This is the most common M4 thread pitch and is compatible with standard M4 nuts, T-nuts, and threaded inserts used in aluminum extrusion systems.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM4 T-Bolts for T-Slot Aluminum Extrusion — Secure Every Joint in Your Frame Build\u003c\/h2\u003e\n    \u003cp\u003eIf you have ever had a joint shift mid-print or a CNC fixture creep under load, you know how critical the right fastener is. Makers, fabricators, and workshop builders who work with T-slot aluminum extrusion profiles need M4 T-bolts that drop into the channel cleanly, lock without spinning, and stay put under vibration. These M4 square head T-bolts are built for exactly that job.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a square head profile machined to fit the T-slot channel of standard aluminum extrusion systems, with a fully threaded shank in 304 stainless steel (A2). Available in five lengths — M4×12mm (≈1\/2\"), M4×16mm (≈5\/8\"), M4×20mm (≈3\/4\"), M4×25mm (≈1\"), and M4×30mm (≈1-3\/16\") — and in quantities from 1 to 200 pieces per order, so you can grab a single replacement or stock up for a full build.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include 3D printer frame assembly (V-slot and 2020\/2040 extrusion builds), CNC router gantry and spoilboard clamping, modular workbench and jig systems, and T-slot aluminum extrusion profile connections in industrial fixtures. The corrosion-resistant A2 finish also makes these suitable for light outdoor enclosures and food-adjacent workshop environments.\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 Designed for standard T-slot aluminum extrusion profiles with a 6mm slot width — typically 20-series (20×20, 20×40, 20×60) and 30-series profiles. Verify your profile's slot width before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M4 Square Head T-Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSquare Head T-Slot Design\u003c\/strong\u003e — The square head profile drops into the T-slot channel and rotates 90° to lock in place, eliminating the need for a separate T-nut on the bolt-head side and speeding up assembly on aluminum extrusion frames.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦾\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e304 Stainless Steel (A2) Construction\u003c\/strong\u003e — Resists rust, oxidation, and mild chemical exposure. A2 stainless is a step up from zinc-plated carbon steel for workshop environments where moisture, coolant mist, or outdoor exposure is a factor.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFive Length Options in One Listing\u003c\/strong\u003e — M4×12mm through M4×30mm covers the most common stack thicknesses in T-slot extrusion builds, from thin bracket connections to thicker gantry plates and multi-layer fixture stacks.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Tiers (1–200 pcs)\u003c\/strong\u003e — Order a single bolt for a quick repair or 200 pieces for a full production run. Per-unit cost drops significantly at higher quantities, making bulk orders practical for workshop restocking.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStandard M4 × 0.7mm Thread Pitch\u003c\/strong\u003e — ISO metric coarse thread is compatible with standard M4 hex nuts, flange nuts, and T-nuts used across all major aluminum extrusion systems including Misumi, Bosch Rexroth, and OpenBuilds-style profiles.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eReusable and Repositionable\u003c\/strong\u003e — Unlike adhesive or press-fit fasteners, these T-bolts can be loosened, slid to a new position along the extrusion channel, and re-tightened — ideal for adjustable jigs, modular workbenches, and iterative CNC router setups.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M4 Square Head T-Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.7mm (ISO metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") \/ 16mm (≈5\/8\") \/ 20mm (≈3\/4\") \/ 25mm (≈1\") \/ 30mm (≈1-3\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eSquare head (T-slot profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel 304\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade \/ Designation\u003c\/th\u003e\n\u003ctd\u003eA2 (per ISO 3506)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eGenerally 500–700 MPa (A2-70 class)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Slot Width\u003c\/th\u003e\n\u003ctd\u003eTypically 6mm T-slot (20-series and 30-series extrusion)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options (square head — tightened via nut on threaded end)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 20 \/ 30 \/ 40 \/ 50 \/ 100 \/ 200 pcs per order\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Square head dimensions (head width and height) vary slightly by manufacturer. If your T-slot channel has tight tolerances, contact us to confirm head dimensions before ordering in bulk.\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 bolt length for my T-slot profile?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the total stack thickness of the parts you are clamping, then add the thread engagement depth — typically 1.5× the bolt diameter for steel nuts. For M4 bolts, that is generally 6mm of thread engagement. So for a 10mm plate, an M4×16mm (≈5\/8\") bolt is typically the right choice. When in doubt, size up one increment.\u003c\/p\u003e\n        \u003cp\u003eQuick reference: M4×12mm suits thin brackets and direct profile-to-profile connections; M4×20mm–25mm works well for most gantry plates and fixture blocks; M4×30mm is suited for thicker stacks or when adding a washer and lock nut.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat clamping load can these M4 T-bolts handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade A2 (304) stainless steel M4 bolts have a proof load of approximately 3.2 kN and a tensile strength of generally 500–700 MPa. Actual clamping force depends on torque applied and lubrication. For structural T-slot frames, always verify load requirements against your specific profile manufacturer's data.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for outdoor or corrosive environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. 304 stainless steel (A2) provides good resistance to atmospheric corrosion, moisture, and mild chemicals. It is generally suitable for outdoor use, light marine environments, and food-adjacent applications. For highly chloride-rich or saltwater environments, 316 (A4) stainless is typically recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich T-slot profile sizes are these bolts compatible with?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese M4 square head T-bolts are designed to slide into the T-slot channel of standard aluminum extrusion profiles — typically 20-series (20×20, 20×40, 20×60) and 30-series profiles with a 6mm slot width. Always verify your profile's slot width and nut channel dimensions before ordering.\u003c\/p\u003e\n        \u003cp\u003eThey are commonly used with OpenBuilds V-slot, Misumi HFS5, Bosch Rexroth 20mm series, and similar metric extrusion systems.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these T-bolts require a special nut, or can I use standard M4 nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square head is designed to lock into the T-slot channel of aluminum extrusion profiles, so no separate T-nut is needed on the bolt-head side. On the clamping side, standard M4 hex nuts, flange nuts, or T-nuts can be used depending on your assembly design.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many bolts should I order for a typical CNC router or 3D printer frame build?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA typical 3D printer or small CNC frame build uses anywhere from 20 to 80 T-bolts depending on the number of joints and accessories. For a first build, ordering a 50-pack of your primary length gives you spares for adjustments. For production or workshop use, the 100- or 200-piece options offer the best per-unit value.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the thread pitch for these M4 bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eM4 bolts use a standard metric coarse thread pitch of 0.7mm per the ISO 68-1 standard. This is the most common M4 thread pitch and is compatible with standard M4 nuts, T-nuts, and threaded inserts used in aluminum extrusion systems.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4*12mm \/ 1 pcs","offer_id":52310126690578,"sku":"PENGBRTQJD020615x1","price":5.43,"currency_code":"USD","in_stock":true},{"title":"M4*16mm \/ 1 pcs","offer_id":52310126723346,"sku":"PENGBRTQJD020616x1","price":5.43,"currency_code":"USD","in_stock":true},{"title":"M4*20mm \/ 1 pcs","offer_id":52310126756114,"sku":"PENGBRTQJD020617x1","price":5.51,"currency_code":"USD","in_stock":true},{"title":"M4*25mm \/ 1 pcs","offer_id":52310126788882,"sku":"PENGBRTQJD020618x1","price":5.56,"currency_code":"USD","in_stock":true},{"title":"M4*30mm \/ 1 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