{"product_id":"countersunk-expansion-bolts-stainless-steel-hex-socket","title":"M6–M12 Countersunk Expansion Bolts | 201 Stainless Steel Hex Socket Sleeve Anchors","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 length for my expansion bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to select a bolt length that allows at least 25–30mm (about 1 inch) of embedment into the base material beyond the fixture thickness. For example, if you're fastening a 20mm bracket into concrete, an M8 x 60mm bolt typically provides adequate holding depth. When in doubt, go longer — you can always use a washer to compensate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What load can these expansion bolts handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on the bolt diameter, embedment depth, and base material strength. Generally, M6 bolts in solid concrete are rated for several hundred pounds of shear load, while M12 bolts can handle significantly more. For structural or safety-critical applications, always consult an engineer and refer to the specific pull-out test data for your substrate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these expansion bolts suitable for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These bolts are made from 201 stainless steel, which provides good corrosion resistance for most outdoor and humid environments. For highly corrosive settings such as coastal areas or chemical exposure, 316 stainless steel is generally recommended. Contact us to confirm suitability for your specific environment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use — metric or imperial?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric fasteners following ISO\/DIN standards. The M6, M8, M10, and M12 designations refer to the nominal thread diameter in millimeters. They are not compatible with UNC or UNF imperial threads. Ensure your nuts and tapped holes are metric before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tool do I need to install these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These countersunk expansion bolts feature a hex socket (Allen key) drive. You'll need a hex key or Allen wrench of the appropriate size — typically 4mm for M6, 5mm for M8, 6mm for M10, and 8mm for M12, though this can vary by manufacturer. A hammer drill is required to pre-drill the anchor hole in concrete or masonry.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these in hollow concrete blocks or brick?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Expansion bolts are generally designed for solid substrates such as poured concrete, solid brick, or natural stone. In hollow block or lightweight aerated concrete, the expansion mechanism may not achieve full grip. For hollow materials, a chemical anchor or toggle bolt is typically a better choice. Contact us if you need guidance on substrate compatibility.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces do I need for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"We offer flexible quantity options from 1 piece up to 100 pieces per order, so you can match exactly what your project requires without overstocking. For larger commercial or construction projects, select the higher quantity tiers for better per-unit value.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCountersunk Expansion Bolts in 201 Stainless Steel — Flush, Secure Anchoring for Concrete \u0026amp; Masonry\u003c\/h2\u003e\n    \u003cp\u003eWhen a standard screw won't hold and a protruding bolt head gets in the way, contractors, DIYers, and facility maintenance teams reach for a countersunk expansion bolt. Whether you're mounting handrails, securing equipment bases, or anchoring structural brackets to concrete walls, a bolt that sits flush with the surface is both safer and cleaner — and that's exactly what these hex socket sleeve anchors deliver.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is machined from 201 stainless steel and features a countersunk head with an internal hex socket drive. Available in thread diameters M6, M8, M10, and M12, with shank lengths from 40mm (≈1.6\") to 100mm (≈3.9\"). Quantity options range from 1 piece to 100 pieces per order, so you can buy exactly what your job requires. The expansion sleeve is integrated into the bolt body — no separate anchor insert needed.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include anchoring steel brackets and angle iron to poured concrete, fastening machinery feet to warehouse floors, securing outdoor signage and fence posts to masonry walls, and installing handrail bases on concrete staircases. The flush countersunk head makes these bolts a go-to choice wherever a protruding fastener would create a trip hazard or clearance issue.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e These are metric fasteners (ISO\/DIN standard). Confirm your hole diameter and thread pitch match the selected size before installation. Designed for solid substrates — poured concrete, solid brick, and natural stone. Not recommended for hollow block without engineering review.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Countersunk Hex Socket Expansion 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\u003eFlush Countersunk Head\u003c\/strong\u003e — The flat countersunk profile sits level with the surface after installation, eliminating snag points and meeting flush-mount requirements for flooring, walkways, and machinery bases.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex Socket (Allen Key) Drive\u003c\/strong\u003e — Internal hex drive allows high torque application in tight spaces where a wrench or screwdriver can't reach, and resists cam-out better than Phillips or slotted heads.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e201 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and oxidation in outdoor, humid, and mildly corrosive environments, making these bolts suitable for exterior concrete anchoring and covered outdoor structures.\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 M6–M12\u003c\/strong\u003e — Four thread diameters and lengths from 40mm to 100mm cover the majority of light-to-medium structural anchoring tasks without needing multiple product lines.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eIntegrated Expansion Sleeve\u003c\/strong\u003e — The sleeve expands radially as the bolt is tightened, creating a mechanical lock inside the drilled hole — no epoxy or chemical anchor required for standard solid-substrate installations.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Order from 1 to 100 pieces per size, so you can match your exact project count — whether it's a single repair or a multi-point installation across a commercial site.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Countersunk Expansion Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCountersunk Hex Socket Expansion Bolt (Sleeve Anchor)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk (Flat Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHex Socket (Allen Key \/ Internal Hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e201 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric (ISO\/DIN)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Thread Diameters\u003c\/th\u003e\n\u003ctd\u003eM6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e40mm (≈1.6\"), 50mm (≈2.0\"), 60mm (≈2.4\"), 70mm (≈2.8\"), 80mm (≈3.1\"), 90mm (≈3.5\"), 100mm (≈3.9\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1, 2, 4, 5, 10, 20, 25, 40, 50, 100 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAnchor Type\u003c\/th\u003e\n\u003ctd\u003eMechanical expansion sleeve (integrated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Base Material\u003c\/th\u003e\n\u003ctd\u003eSolid concrete, solid brick, natural stone\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill finish stainless (no additional coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments; contact us to confirm for highly corrosive applications\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHole Diameter Required\u003c\/th\u003e\n\u003ctd\u003eSee variant options — match drill bit to bolt diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMinimum Embedment Depth\u003c\/th\u003e\n\u003ctd\u003eSee variant options — typically 25–30mm beyond fixture thickness\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\u003eInstallation Note:\u003c\/strong\u003e Always pre-drill with a hammer drill using the correct carbide-tipped masonry bit. Do not use in hollow block, aerated concrete, or soft substrates without engineering confirmation. Torque to manufacturer specification — overtightening can crack the substrate.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my expansion bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to select a bolt length that allows at least 25–30mm (about 1\") of embedment into the base material beyond the fixture thickness. For example, if you're fastening a 20mm bracket into concrete, an M8 x 60mm bolt typically provides adequate holding depth. When in doubt, go longer — you can always use a washer to compensate for any gap.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load can these expansion bolts handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eLoad capacity depends on the bolt diameter, embedment depth, and base material strength. Generally, M6 bolts in solid concrete are rated for several hundred pounds of shear load, while M12 bolts can handle significantly more. For structural or safety-critical applications, always consult an engineer and refer to pull-out test data for your specific substrate.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these expansion bolts suitable for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These bolts are made from 201 stainless steel, which provides good corrosion resistance for most outdoor and humid environments. For highly corrosive settings — such as coastal areas or chemical exposure — 316 stainless steel is generally recommended. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — metric or imperial?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are metric fasteners following ISO\/DIN standards. The M6, M8, M10, and M12 designations refer to the nominal thread diameter in millimeters. They are not compatible with UNC or UNF imperial threads. Ensure your nuts and tapped holes are metric before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tool do I need to install these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese countersunk expansion bolts feature a hex socket (Allen key) drive. You'll typically need a 4mm hex key for M6, 5mm for M8, 6mm for M10, and 8mm for M12 — though this can vary slightly by manufacturer. A hammer drill with a carbide-tipped masonry bit is required to pre-drill the anchor hole in concrete or masonry.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these in hollow concrete blocks or brick?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eExpansion bolts are generally designed for solid substrates such as poured concrete, solid brick, or natural stone. In hollow block or lightweight aerated concrete, the expansion mechanism may not achieve full grip. For hollow materials, a chemical anchor or toggle bolt is typically a better choice. Contact us if you need guidance on substrate compatibility.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces do I need for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eWe offer flexible quantity options from 1 piece up to 100 pieces per order, so you can match exactly what your project requires without overstocking. For larger commercial or construction projects, select the higher quantity tiers for better per-unit value.\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":"M6 x 40mm \/ 5 Pcs","offer_id":52308751745298,"sku":"GYZXKGY-TCWJTC7779x1","price":9.37,"currency_code":"USD","in_stock":true},{"title":"M6 x 50mm \/ 5 Pcs","offer_id":52308751778066,"sku":"GYZXKGY-TCWJTC7780x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"M6 x 60mm \/ 2 Pcs","offer_id":52308751810834,"sku":"GYZXKGY-TCWJTC7781x1","price":7.19,"currency_code":"USD","in_stock":true},{"title":"M6 x 70mm \/ 2 Pcs","offer_id":52308751843602,"sku":"GYZXKGY-TCWJTC7782x1","price":7.41,"currency_code":"USD","in_stock":true},{"title":"M6 x 80mm \/ 2 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