M6 M8 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel

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M6 M8 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel

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Size: M6 x 10mm

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M6 M8 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel for Reliable Metric Fastening

When a loose joint or a corroded bolt ruins a project — whether it's a garden bench, a deck railing, or a structural frame — the fix starts with the right fastener. DIYers, woodworkers, and contractors who need a clean, tamper-resistant bolt head with a matching nut that won't spin loose will find this kit built for exactly that job. The domed head of a carriage bolt sits flush and smooth on the visible face of your work, while the square shank locks it in place without needing a second wrench.

Each kit pairs A2 stainless steel carriage bolts with matching hex flange nuts. Available in M6 (lengths 10mm–90mm / ≈3/8"–3-1/2") and M8 (lengths 12mm–120mm / ≈1/2"–4-3/4"), with quantity options of 1, 5, 10, 15, or 20 pieces per order. The hex flange nut's integrated washer flange distributes clamping load evenly, eliminating the need for a separate flat washer in most applications.

Typical use cases include outdoor furniture assembly, deck and pergola construction, gate hardware, timber framing connections, and general workshop jigs — anywhere you need a metric carriage bolt that resists corrosion and stays put. The A2 stainless steel grade makes these a go-to choice for stainless carriage bolts for wood projects and light outdoor structural work.

🔩 Thread Compatibility: M6 (pitch 1.0mm) and M8 (pitch 1.25mm) — ISO metric standard. Not compatible with UNC/UNF inch threads. Confirm your hole diameter matches the bolt shank before ordering.

✅ Key Features of These M6 M8 Stainless Steel Carriage Bolts with Flange Nuts

🔘Domed, Tool-Free Head — The smooth rounded head sits flush on the surface and requires no wrench on the bolt side, making it ideal for carriage bolts for wood furniture and decking where a clean finish matters.
🔒Square-Neck Anti-Rotation Shank — The square section under the head bites into wood or soft material to prevent spinning during tightening, so one person can fasten without holding the bolt head.
🛡️A2 Stainless Steel Construction — Resists rust and oxidation in outdoor and damp environments, making these stainless carriage bolts suitable for garden, deck, and light marine applications without surface treatment.
⚙️Integrated Flange Nut — The hex flange nut's built-in washer face spreads the clamping load over a wider area, reducing pull-through risk on softer substrates and eliminating a separate washer from your parts list.
📏Wide Size Range — M6 from 10mm (≈3/8") to 90mm (≈3-1/2") and M8 from 12mm (≈1/2") to 120mm (≈4-3/4") covers the most common metric bolt lengths for structural and furniture fastening in one listing.
📦Flexible Quantity Options — Order 1, 5, 10, 15, or 20 pieces to match your project scale — whether you need a single replacement bolt or a bulk supply for a larger build.

📐 Technical Specifications — M6 M8 Carriage Bolt and Hex Flange Nut Kit

Bolt Type	Carriage Bolt (Round Head, Square Neck)
Nut Type	Hex Flange Nut (integrated washer flange)
Material	A2 Stainless Steel (ISO 3506)
Thread Standard	ISO Metric Coarse
M6 Thread Pitch	1.0mm
M8 Thread Pitch	1.25mm
Available Diameters	M6, M8
M6 Length Range	10mm–90mm (≈3/8"–3-1/2")
M8 Length Range	12mm–120mm (≈1/2"–4-3/4")
Head Style	Dome (Round) — smooth, tamper-resistant
Drive Style	None (square neck prevents rotation; no tool needed on head)
Finish	Natural stainless (no coating)
Quantity per Order	1, 5, 10, 15, or 20 pieces (see variant options)
Tensile Strength (typical)	≈700 MPa (A2-70 class)
Corrosion Resistance	Good — suitable for outdoor and damp environments
Country of Origin	See variant options

⚠️ Sizing Note: Bolt length is measured from under the head to the tip of the thread. If you are unsure which length fits your application, contact us to confirm before ordering.

❓ Frequently Asked Questions

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

As a general rule, add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for thread engagement beyond the nut. For example, joining two 10mm panels with an M6 bolt typically requires at least 30mm (≈1-3/16") of length. 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 (ISO 3506 property class 70) generally has a minimum tensile strength of 700 MPa and a proof load stress of approximately 450 MPa. This makes it suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult an engineer.

Are these carriage bolts suitable for outdoor or marine use?

A2 stainless steel offers good corrosion resistance and is typically suitable for outdoor environments including garden furniture, decking, and light marine applications. For highly aggressive saltwater or chemical environments, A4 (316) stainless steel is generally recommended instead.

What thread standard do these bolts use — metric or imperial?

These are metric fasteners following the ISO/DIN standard. M6 bolts have a standard pitch of 1.0mm and M8 bolts have a standard pitch of 1.25mm. They are not compatible with UNC/UNF (inch) threaded holes or nuts.

Do the hex flange nuts included in this kit require a separate washer?

No. The hex flange nut features an integrated flange that acts as a built-in washer, distributing the clamping load over a wider surface area. This eliminates the need for a separate flat washer in most applications and helps prevent the nut from pulling through softer materials.

How do I install a carriage bolt correctly?

Drill a hole matching the bolt diameter through your material. Insert the carriage bolt from the front — the domed head sits flush on the surface. The square shank under the head bites into the material to prevent rotation. Thread the hex flange nut from the back and tighten with a wrench. No tool is needed on the bolt head side.

Can I use these bolts with wood, metal, or plastic?

Yes. Carriage bolts are commonly used with wood (decking, furniture, framing), thin metal sheet, and rigid plastics. The square neck anti-rotation feature works best in wood or soft materials. For metal applications, a square hole or a separate anti-rotation method may be needed.

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M6 M8 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel

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Beschreibung

M6 M8 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel for Reliable Metric Fastening

✅ Key Features of These M6 M8 Stainless Steel Carriage Bolts with Flange Nuts

📐 Technical Specifications — M6 M8 Carriage Bolt and Hex Flange Nut Kit

❓ Frequently Asked Questions

M6 M8 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel

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