M10 M12 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel Kit

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M10 M12 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel Kit

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Size: M10 x 16mm

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M10 & M12 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel Kit for Lasting Connections

Whether you're building a backyard deck, hanging a gate, assembling outdoor furniture, or tackling a structural repair, finding fasteners that won't rust out or loosen over time is half the battle. These M10 M12 carriage bolts with hex flange nuts are designed for DIYers and tradespeople who need a reliable, corrosion-resistant connection without the guesswork of sourcing matching hardware separately.

Each kit pairs a round-head, square-neck carriage bolt with a matching hex flange nut — both manufactured from A2 stainless steel (304 grade). Available in M10 and M12 thread diameters, with lengths ranging from 16mm (5/8") to 100mm (≈3-15/16"), and sold in quantities of 1, 3, 5, or 8 pieces per order. The bolt's smooth domed head sits flush against the surface while the square neck locks into wood or pre-drilled square holes to prevent spinning during tightening.

Typical use cases include timber deck framing and railing posts, garden gate and fence hardware, outdoor furniture and pergola assembly, and general-purpose structural fastening where a stainless steel carriage bolt and flange nut combination is specified. The metric coarse thread profile ensures compatibility with standard DIN 603 hardware across the board.

🔩 Compatibility: Metric coarse thread (ISO 68-1 / DIN 603). M10 pitch typically 1.5mm · M12 pitch typically 1.75mm. Hex flange nuts are thread-matched and included — no separate nut required.

✅ Key Features of These M10 M12 A2 Stainless Steel Carriage Bolts

🦀A2 Stainless Steel Construction — Made from 304-grade stainless steel for solid corrosion resistance in outdoor, humid, and mildly coastal environments without surface coatings that can chip or peel.
🔒Anti-Spin Square Neck — The square shoulder under the domed head bites into wood or square-punched holes, keeping the bolt stationary while you tighten the nut — no second wrench needed on the bolt side.
🛡️Hex Flange Nut Included — Each bolt ships with a matching hex flange nut whose integrated bearing flange spreads clamping load over a wider area, reducing pull-through risk in wood and composite materials.
📏Wide Size Selection — M10 lengths from 16mm (5/8") to 100mm (≈3-15/16") and M12 lengths from 25mm (≈1") to 100mm (≈3-15/16") cover the most common structural fastening scenarios in a single product listing.
📦Flexible Quantity Options — Order 1, 3, 5, or 8 pieces to match your exact project needs — whether you need a single replacement or a small batch for a framing job, without buying a full box of 50.
⚙️DIN 603 Compliant Profile — The round countersunk head and square neck conform to DIN 603 geometry, making these bolts a direct fit wherever a metric carriage bolt is called out in plans or specifications.

📐 Technical Specifications — M10 M12 Carriage Bolt & Hex Flange Nut Kit

Thread Diameter	M10 / M12
Thread Standard	Metric coarse (ISO 68-1 / DIN 603)
Thread Pitch	M10: typically 1.5mm · M12: typically 1.75mm
Available Lengths (M10)	16mm (5/8") · 20mm (25/32") · 25mm (1") · 30mm (1-3/16") · 35mm (1-3/8") · 40mm (1-9/16") · 45mm (1-3/4") · 50mm (2") · 55mm (2-3/16") · 60mm (2-3/8") · 70mm (2-3/4") · 80mm (3-1/8") · 90mm (3-9/16") · 100mm (3-15/16")
Available Lengths (M12)	25mm (1") · 30mm (1-3/16") · 35mm (1-3/8") · 40mm (1-9/16") · 45mm (1-3/4") · 50mm (2") · 55mm (2-3/16") · 60mm (2-3/8") · 70mm (2-3/4") · 80mm (3-1/8") · 90mm (3-9/16") · 100mm (3-15/16")
Head Style	Round dome (mushroom head), square neck
Nut Type	Hex flange nut (integrated bearing flange)
Material	A2 Stainless Steel (304 grade)
Finish	Mill / natural stainless (no coating)
Tensile Strength	Typically ≥500 MPa (ISO 3506 A2-50)
Quantity per Order	1 / 3 / 5 / 8 pieces (bolt + nut set)
Drive Tool (nut side)	See variant options (M10: typically 17mm hex · M12: typically 19mm hex)
Country of Origin	Contact us to confirm

⚠️ Heads up: Bolt length is measured from under the head to the tip. If you're fastening through thick stock, measure your material stack and add clearance for the nut before selecting a length.

❓ Frequently Asked Questions

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

A general rule: add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for the nut and washer stack. For example, joining two 10mm panels with an M10 bolt typically calls for a length of 25–30mm (about 1" to 1-3/16"). When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.

What is the tensile strength of A2 stainless steel carriage bolts?

A2 stainless steel (304 grade) carriage bolts are generally rated at a minimum tensile strength of 500 MPa (≈72,500 psi) per ISO 3506. This is suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult a structural engineer.

Are these bolts suitable for outdoor or marine use?

A2 stainless steel offers good corrosion resistance and is suitable for most outdoor environments including rain, humidity, and mild coastal exposure. For heavily salt-laden marine environments, A4 (316) stainless steel is generally recommended for longer service life.

What thread standard do these carriage bolts use — are they compatible with standard metric nuts?

These bolts follow the metric coarse thread standard (ISO 68-1 / DIN 603). M10 bolts typically have a 1.5mm pitch and M12 bolts a 1.75mm pitch. The included hex flange nuts are matched to the same thread standard, so no separate nut sourcing is needed. They are also compatible with standard ISO metric hex nuts of the same size.

When should I choose M10 vs M12 for my application?

M10 is generally used for lighter structural connections, furniture assembly, and medium-duty brackets. M12 is better suited for heavier loads, deck framing, gate hardware, and applications where greater clamping force is needed. If you're unsure, M12 provides a wider safety margin for most outdoor structural work.

What is a hex flange nut and why is it paired with carriage bolts?

A hex flange nut has a built-in wide bearing flange that distributes clamping load over a larger surface area — similar to using a washer, but in one piece. This reduces the chance of the nut pulling through softer materials and provides a more secure, vibration-resistant connection, making it a practical choice for wood, composite, and thin-metal assemblies.

Do I need a separate washer with these bolts?

The included hex flange nut already incorporates a bearing flange, so a separate nut-side washer is generally not required. On the bolt head side, a washer is recommended when fastening into soft wood or composite materials to prevent the domed head from pulling through under load.

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

M10 M12 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel Kit

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M10 & M12 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel Kit for Lasting Connections

✅ Key Features of These M10 M12 A2 Stainless Steel Carriage Bolts

📐 Technical Specifications — M10 M12 Carriage Bolt & Hex Flange Nut Kit

❓ Frequently Asked Questions

M10 M12 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel Kit

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