{"product_id":"m6-m8-extra-long-masonry-expansion-bolts-concrete-anchor-screws","title":"M6 M8 Extra Long Masonry Expansion Bolts — Concrete Wall Anchor Screws (30–80mm)","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 project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule: the bolt length should be at least 1.5× the thickness of the material being fastened, plus the embedment depth into the base material. For example, fastening a 10mm bracket into concrete typically requires at least a 30mm (≈1-3\/16\\u201d) bolt. For heavier loads or thicker fixtures, choose 60mm (≈2-3\/8\\u201d) or 80mm (≈3-1\/8\\u201d) options.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity of these expansion bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on bolt diameter, embedment depth, and base material strength. Generally, M6 expansion bolts in solid concrete can handle tensile loads of approximately 1–2 kN, while M8 bolts typically support 2–4 kN. Always consult a structural engineer for safety-critical applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these bolts be used outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The stainless steel variants are generally suitable for outdoor and damp environments, offering corrosion resistance in most weather conditions. The black oxide (black finish) variants are better suited for dry indoor use, as the coating provides only mild corrosion protection.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These expansion bolts use standard metric coarse threads — M6 (1.0mm pitch) and M8 (1.25mm pitch) — compatible with standard metric nuts and fixtures. They are not compatible with UNC\/UNF inch-standard hardware.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What base materials are these anchor bolts compatible with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These expansion bolts are designed for solid base materials including poured concrete, concrete block, brick, and natural stone. They are generally not recommended for hollow block, drywall, or soft materials where the expansion sleeve cannot grip properly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I choose stainless steel or black oxide finish?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose stainless steel for outdoor installations, high-humidity areas, or anywhere long-term corrosion resistance matters. Choose the black oxide finish for indoor projects where aesthetics or cost are the priority — the dark finish blends well with dark surfaces and is typically more economical.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many bolts come in each pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each size option contains 20 pieces per bag. You can select 1, 3, or 5 bags at checkout, giving you 20, 60, or 100 bolts respectively. The expansion bolt sets (4PCS) are a separate configuration that includes 4 complete anchor assemblies.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM6 M8 Extra Long Masonry Expansion Bolts — Reliable Concrete Wall Anchor Screws for Demanding Installations\u003c\/h2\u003e\n    \u003cp\u003eWhether you're mounting heavy shelving to a concrete wall, securing structural brackets to a brick facade, or anchoring equipment to a masonry floor, a loose or failed anchor bolt can mean hours of rework — or worse, a safety hazard. These M6 M8 extra long masonry expansion bolts are built for contractors, serious DIYers, and anyone who needs a dependable concrete wall anchor screw that holds under real-world load.\u003c\/p\u003e\n    \u003cp\u003eEach pack contains 20 pieces of expansion anchor bolts, available in M6 and M8 thread diameters with lengths ranging from 30mm (≈1-3\/16\") to 80mm (≈3-1\/8\"). Choose stainless steel for corrosion-resistant performance or black oxide finish for indoor applications. Multi-bag options (1, 3, or 5 packs of 20) let you stock up for larger jobs. Expansion bolt sets (4PCS) are also available in stainless steel or iron for complete anchor assemblies.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include anchoring wall-mounted shelving and cabinets to concrete or block walls, securing electrical conduit brackets and junction boxes to masonry, fastening deck ledger boards or pergola posts to concrete foundations, and installing HVAC equipment mounts in commercial or residential construction — all scenarios where a reliable masonry anchor bolt for concrete walls makes the difference between a solid installation and a callback.\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 solid concrete, brick, natural stone, and dense masonry. M6 bolts use standard 1.0mm pitch; M8 bolts use standard 1.25mm pitch — compatible with metric nuts and fixtures. Not recommended for hollow block, drywall, or soft substrates.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M6 M8 Extra Long Masonry 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\u003eExtended Length Range\u003c\/strong\u003e — Available from 30mm (≈1-3\/16\") up to 80mm (≈3-1\/8\"), giving you the embedment depth needed for thick fixtures or deep concrete anchor bolt installations where standard-length fasteners fall short.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDual Diameter Options\u003c\/strong\u003e — M6 and M8 thread sizes cover the most common metric masonry anchor applications, from lightweight conduit brackets to heavier structural mounts, without needing multiple fastener systems on the same job.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStainless Steel Corrosion Resistance\u003c\/strong\u003e — The stainless steel variants resist rust and oxidation in outdoor, damp, or coastal environments, making them a practical choice for exterior concrete wall anchor screw applications where longevity matters.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Oxide Finish for Indoor Use\u003c\/strong\u003e — The black finish variants blend cleanly into dark surfaces and painted concrete, offering a low-profile look for interior installations such as basement shelving, utility rooms, and equipment rooms.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBulk Pack Flexibility\u003c\/strong\u003e — Each size ships in 20-piece bags, with options to buy 1, 3, or 5 bags at once — so whether you need a small top-up or a full project supply of concrete expansion anchor bolts, you're not over- or under-ordering.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWedge-Style Expansion Mechanism\u003c\/strong\u003e — The sleeve expands outward as the bolt is tightened, creating a mechanical lock against the bore wall in concrete or masonry — no adhesive required, and the connection can generally be inspected and re-torqued if needed.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M6 M8 Masonry Expansion Anchor 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\u003eWedge-style expansion anchor bolt (sleeve anchor)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM6, M8 (metric coarse thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM6: 1.0mm | M8: 1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e30mm (≈1-3\/16\"), 35mm (≈1-3\/8\"), 40mm (≈1-9\/16\"), 60mm (≈2-3\/8\"), 80mm (≈3-1\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eStainless steel; Black oxide carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eStainless steel (natural) or Black oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePieces per Bag\u003c\/th\u003e\n\u003ctd\u003e20 pieces (standard sizes) | 4 pieces (expansion bolt sets)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 bag, 3 bags, or 5 bags\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Base Materials\u003c\/th\u003e\n\u003ctd\u003eSolid concrete, brick, natural stone, dense masonry block\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Hole Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Rating (SS)\u003c\/th\u003e\n\u003ctd\u003eSuitable for outdoor and damp environments\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Rating (Black)\u003c\/th\u003e\n\u003ctd\u003eIndoor \/ dry environments recommended\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 Drill bit diameter must match the bolt's expansion sleeve OD. Always verify the required hole size for your specific variant before drilling. Contact us if you need confirmation.\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 bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: the bolt length should be at least 1.5× the thickness of the material being fastened, plus the embedment depth into the base material. For example, fastening a 10mm bracket into concrete typically requires at least a 30mm (≈1-3\/16\") bolt. For heavier loads or thicker fixtures, choose 60mm (≈2-3\/8\") or 80mm (≈3-1\/8\") options. When in doubt, go longer — you can always trim embedment depth with a washer, but you can't extend a bolt that's too short.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load capacity of these expansion bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eLoad capacity depends on bolt diameter, embedment depth, and base material strength. Generally, M6 expansion bolts in solid concrete can handle tensile loads of approximately 1–2 kN, while M8 bolts typically support 2–4 kN under similar conditions. Shear capacity is typically higher. Always consult a structural engineer for safety-critical or overhead applications — these figures are general estimates and vary with installation quality and concrete grade.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these bolts be used outdoors or in wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe stainless steel variants are generally suitable for outdoor and damp environments, offering corrosion resistance in most weather conditions including rain exposure and moderate humidity. The black oxide (black finish) variants are better suited for dry indoor use — the black oxide coating provides only mild corrosion protection and will rust over time if exposed to moisture.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and are they compatible with my hardware?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese expansion bolts use standard metric coarse threads — M6 (1.0mm pitch) and M8 (1.25mm pitch). They are compatible with standard metric nuts, washers, and fixtures. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-standard hardware. If your existing fixtures use SAE\/imperial threads, you will need an adapter or different fastener.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat base materials are these anchor bolts compatible with?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese expansion bolts are designed for solid base materials including poured concrete, concrete block (solid), brick, and natural stone. They are generally not recommended for hollow block, lightweight aerated concrete (AAC), drywall, or soft materials where the expansion sleeve cannot grip the bore wall properly. For hollow substrates, consider toggle bolts or hollow-wall anchors instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I choose stainless steel or black oxide finish?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eChoose \u003cstrong\u003estainless steel\u003c\/strong\u003e for outdoor installations, high-humidity areas, coastal environments, or anywhere long-term corrosion resistance is a priority. Choose the \u003cstrong\u003eblack oxide finish\u003c\/strong\u003e for indoor projects where aesthetics or budget are the main consideration — the dark finish blends well with dark surfaces and is typically more economical per piece. Both finishes use the same wedge-expansion mechanism and are available in M6 and M8 sizes.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many bolts come in each pack, and what are the bulk options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eEach size option contains \u003cstrong\u003e20 pieces per bag\u003c\/strong\u003e. At checkout you can select 1 bag (20 pcs), 3 bags (60 pcs), or 5 bags (100 pcs) — bulk packs offer a lower per-piece cost for larger jobs. The expansion bolt sets are a separate configuration that includes 4 complete anchor assemblies (bolt + sleeve + nut + washer) per pack, available in stainless steel or iron.\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 pack quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"（Stainless Steel）6*30mm Long（20PCS） \/ 1pcs","offer_id":52308777894162,"sku":"GLFBMLBHDBSWJ002249x1","price":11.1,"currency_code":"USD","in_stock":true},{"title":"（Stainless Steel）8*35mm Long（20PCS） \/ 1pcs","offer_id":52308777926930,"sku":"GLFBMLBHDBSWJ002250x1","price":17.2,"currency_code":"USD","in_stock":true},{"title":"（Stainless Steel）8*40mm Long（20PCS） \/ 1pcs","offer_id":52308777959698,"sku":"GLFBMLBHDBSWJ002251x1","price":18.85,"currency_code":"USD","in_stock":true},{"title":"Black\u00266*30mm 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