M8 M10 M12 Carriage Bolts – A2-70 Stainless Steel Cup Square Domed Screws

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M8 M10 M12 Carriage Bolts – A2-70 Stainless Steel Cup Square Domed Screws

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Size: M8 x 12mm

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M8 M10 M12 Carriage Bolts — Secure, Rust-Resistant Fastening for Wood & Structural Projects

Whether you're building a backyard deck, assembling a timber frame, or reinforcing a gate, loose or corroded fasteners can compromise the entire structure. These A2-70 stainless steel carriage bolts are built for DIYers, contractors, and woodworkers who need a reliable, corrosion-resistant connection that holds up over time — without constant maintenance.

Each bolt features a smooth domed head with a square neck shank, machined to ISO metric coarse thread standards. Available in three diameters — M8, M10, and M12 — with lengths ranging from 12mm (≈1/2") up to 120mm (≈4-3/4"). Sold individually or in multi-packs of 3, 5, 10, or 15 pieces so you can order exactly what your project requires.

Typical applications include wood deck construction with carriage bolt fasteners, timber pergola and fence post assembly, outdoor furniture framing, and structural bracket connections where a flush, tamper-resistant head is needed on the visible face.

🔩 Compatibility: Fits standard ISO metric hex nuts and flat washers — M8, M10, or M12 as selected. Thread pitch follows DIN 603 coarse thread specification (M8 × 1.25mm, M10 × 1.5mm, M12 × 1.75mm). Designed for wood-to-wood and wood-to-metal connections.

⚠️ Sizing note: Please confirm the total material thickness and required thread engagement before ordering. If you are unsure which length is right for your application, contact us to confirm before purchase.

✅ Key Features of These M8 M10 M12 Stainless Steel Carriage Bolts

🛡️A2-70 Stainless Steel Construction — Made from austenitic 304-equivalent stainless steel with a minimum tensile strength of 700 MPa, offering solid resistance to rust, oxidation, and atmospheric corrosion for long-lasting outdoor use.
🔘Cup Square Domed Head Design — The smooth, rounded head sits flush and tamper-resistant on the visible face of your workpiece, while the square neck locks into wood to prevent spinning during installation — no wrench needed on the bolt side.
📐Wide Size Range for Every Application — Choose from M8, M10, or M12 diameter with lengths from 12mm (≈1/2") to 120mm (≈4-3/4"), covering light furniture assembly through heavy-duty structural timber connections.
🔧ISO Metric Coarse Thread Standard — Machined to DIN 603 specification, these carriage bolts are compatible with any standard metric hex nut and washer, making them easy to source matching hardware at any hardware store.
📦Flexible Pack Quantities — Available in 1, 3, 5, 10, or 15-piece packs so you can match your order to your exact project needs — whether it's a single repair or a full deck build requiring stainless carriage bolts in bulk.
🏗️Versatile Structural Fastener — Suited for deck framing, pergola construction, fence post connections, outdoor furniture, and any application where a clean, domed head finish and reliable clamping force are required.

📐 Technical Specifications — Stainless Steel Carriage Bolts M8 M10 M12

Product Type	Carriage Bolt (Cup Square Domed Head)
Standard	DIN 603 / ISO 8677
Material	A2-70 Stainless Steel (304 equivalent)
Available Diameters	M8, M10, M12
Thread Pitch	M8 × 1.25mm \| M10 × 1.5mm \| M12 × 1.75mm
Available Lengths	M8: 12–120mm (≈1/2"–4-3/4") \| M10: 16–100mm (≈5/8"–4") \| M12: 25–100mm (≈1"–4")
Head Style	Domed (round) with square neck shank
Drive Style	No drive — nut-tightened from opposite side
Tensile Strength	700 MPa minimum (A2-70 grade)
Finish	Natural stainless (no coating)
Pack Quantities	1 / 3 / 5 / 10 / 15 pieces (see variant options)
Compatible Hardware	Standard ISO metric hex nuts & flat washers (same diameter)
Recommended Use	Wood-to-wood, wood-to-metal structural connections
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right length for my carriage bolt?

Generally, the bolt length should equal the total thickness of all materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3/4") boards with an M8 bolt would typically call for a 50mm (≈2") bolt. When in doubt, size up.

What does A2-70 mean and how strong are these bolts?

A2 refers to the austenitic stainless steel grade (equivalent to 304 SS), and 70 indicates a minimum tensile strength of 700 MPa. This makes them suitable for most structural and general-purpose fastening applications where corrosion resistance is also required.

Can these carriage bolts be used outdoors or in wet environments?

Yes. A2 stainless steel offers good resistance to rust and atmospheric corrosion, making these bolts generally suitable for outdoor, marine-adjacent, and humid environments. For highly aggressive saltwater or chemical environments, A4 (316 SS) grade is typically recommended instead.

What thread standard do these carriage bolts use?

These bolts use standard ISO metric coarse threads (DIN 603 / ISO 8677 profile). M8 bolts have a 1.25mm pitch, M10 have a 1.5mm pitch, and M12 have a 1.75mm pitch. They are compatible with standard metric hex nuts and washers of the same diameter.

Do I need a special tool to install a carriage bolt?

No special tools are required. The square neck under the domed head is designed to bite into wood or soft material as you tighten the nut, preventing the bolt from spinning. Simply push the bolt through the pre-drilled hole and tighten the nut from the other side with a standard wrench or socket.

Which size should I choose — M8, M10, or M12?

M8 (≈5/16") is generally used for lighter structural connections and furniture. M10 (≈3/8") suits medium-duty framing, gates, and brackets. M12 (≈1/2") is typically chosen for heavy-duty structural work, decking, and load-bearing joints. Always verify the load requirements of your specific application.

Can I use these bolts with metal, not just wood?

Carriage bolts are primarily designed for wood-to-wood or wood-to-metal connections where the square neck locks into the material. For metal-to-metal connections, the square neck may not grip properly — in that case, a hex bolt or socket cap screw is generally more appropriate.

🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.

M8 M10 M12 Carriage Bolts – A2-70 Stainless Steel Cup Square Domed Screws

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Beschreibung

M8 M10 M12 Carriage Bolts — Secure, Rust-Resistant Fastening for Wood & Structural Projects

✅ Key Features of These M8 M10 M12 Stainless Steel Carriage Bolts

📐 Technical Specifications — Stainless Steel Carriage Bolts M8 M10 M12

❓ Frequently Asked Questions

M8 M10 M12 Carriage Bolts – A2-70 Stainless Steel Cup Square Domed Screws

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