M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL
M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL

M6 M8 M10 M12 CARRIAGE BOLTS CUP SQUARE DOMED COACHSCREWS A2-70 STAINLESS STEEL

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🔩 M6-M12 SIZES ⚙️ A2-70 STAINLESS STEEL 🏗️ DIN603 STANDARD

Premium Stainless Steel Carriage Bolts

Self-locking design for wood and construction applications! Also known as coach screws, these feature a domed head and square collar that prevents rotation during tightening.

🔘
Dome Head
Smooth, rounded finish
⬜
Square Collar
Prevents rotation
🔩
Fully Threaded
Complete shaft

⭐ Key Features of Our Carriage Bolts

Our carriage bolts combine self-locking design with corrosion resistance:

🔩 M6 M8 M10 M12 ⚙️ A2-70 Stainless Steel 🛡️ Corrosion Resistant 📏 DIN603 Standard 🔒 Self-Locking Design 💪 Fully Threaded 🏡 Perfect for Wood 📦 Custom Quantity Options

🔧 How Carriage Bolts Work

Unique self-locking mechanism: The square collar under the dome head sinks into wood or soft materials as you tighten the nut, preventing the bolt from rotating. This allows single-person installation - you can tighten the nut without needing to hold the bolt head with a wrench!

📐 Available Sizes

Available in four heavy-duty metric sizes for construction projects:

M6
15mm Head
1.0mm Pitch
M8
19mm Head
1.25mm Pitch
M10
24mm Head
1.5mm Pitch
M12
30mm Head
1.75mm Pitch

📊 Technical Specifications

Size Thread Diameter Thread Pitch Head Diameter Primary Uses
M6 6mm 1.0mm 15mm Furniture, light construction
M8 8mm 1.25mm 19mm Decking, fencing, structures
M10 10mm 1.5mm 24mm Heavy construction, gates
M12 12mm 1.75mm 30mm Structural, heavy timber
General Specification Details
Product Type Carriage Bolts / Coach Screws / Cup Square Bolts
Material A2-70 Stainless Steel (304 Equivalent)
Standard DIN603 (German Industrial Standard)
Head Type Domed Head with Square Collar (Shoulder)
Thread Type Standard Metric Coarse Threads (Fully Threaded)
Length Measurement Includes square collar but not domed head height
Surface Finish Untreated (Natural Stainless Steel Finish)
Installation Method Square collar prevents rotation during nut tightening
Corrosion Resistance Excellent - Ideal for Outdoor & Marine Applications
Temperature Resistance Up to 400°C (752°F) continuous service

✅ Advantages of Carriage Bolts

Why choose carriage bolts over regular bolts? These specialized fasteners offer unique benefits:

  • Self-locking design - Square collar prevents rotation during tightening
  • Single-person installation - No need for two wrenches or tools
  • Clean appearance - Domed head provides finished look
  • Safety enhanced - Rounded head reduces injury risk
  • Wood-friendly - Square collar sinks into wood without splitting
  • Corrosion resistance - Stainless steel for outdoor durability

🏭 Common Applications

Our stainless steel carriage bolts are ideal for:

🏡

Deck & Fence Building

Deck boards, railings, fence posts, gate hinges

🪑

Outdoor Furniture

Patio furniture, picnic tables, benches, pergolas

🏗️

Timber Construction

Wood framing, timber joints, structural connections

🚗

Trailer & Equipment

Trailer decks, truck beds, equipment mounting

🚤

Marine & Dock

Boat decks, dock construction, marine fixtures

🎪

Playground Equipment

Swings, climbing frames, play structures

🔧 Installation Instructions

For proper installation of carriage bolts:

  1. Drill pilot hole - Match bolt diameter for proper fit
  2. Create square recess (optional) - For metal applications, create square hole for collar
  3. Insert bolt - Push bolt through material until square collar engages
  4. Add washer & nut - Place washer (recommended) and thread on nut
  5. Tighten nut - Bolt won't rotate due to square collar engagement
  6. Check engagement - Ensure square collar is properly seated in material

🪵 Material Compatibility Guide

Material Type Installation Method Notes
Wood Direct installation Square collar sinks into wood naturally - no special preparation needed
Metal Square hole required Must drill/cut square hole for collar to engage and prevent rotation
Plastic/Composite Direct or pre-drilled Works well; may need pilot hole for harder composites
Multiple Materials Square hole in top layer Square collar must engage in top material to prevent rotation

❓ Frequently Asked Questions

Q: How do carriage bolts prevent rotation? 🔒
A: Carriage bolts have a square collar (shoulder) directly under the domed head. When inserted into wood or a properly prepared square hole in metal, this square collar engages with the material and prevents the bolt from rotating as you tighten the nut. This unique design allows for single-tool installation.
Q: Can these be used in metal applications? ⚙️
A: Yes, but with preparation. For metal applications, you must create a square hole (not just round) for the square collar to engage. Without a properly sized square hole, the bolt will simply rotate when you try to tighten the nut. In wood, the square collar naturally sinks in without special preparation.
Q: How are these bolts measured? 📏
A: Carriage bolts are measured from the bottom of the square collar (where it contacts the material) to the tip of the bolt. The measurement includes the square collar length but excludes the domed head height. This ensures you get the proper thread engagement length for your application.
Q: Are these suitable for outdoor decks and fences? 🏡
A: Absolutely! Our A2 stainless steel carriage bolts are perfect for outdoor applications like decks, fences, and outdoor furniture. They won't rust like regular steel bolts, and the domed head provides a clean appearance while reducing tripping hazards. The square collar design works exceptionally well in wood applications.
Q: What is the DIN603 standard? 🇩🇪
A: DIN603 is a German industrial standard that specifies the dimensions, tolerances, and technical requirements for carriage bolts (coach screws). This standard ensures consistent quality, proper square collar dimensions, head size, and thread specifications for reliable performance in construction and woodworking applications.
Q: Should I use washers with carriage bolts? ⚪
A: Highly recommended! While not always strictly necessary, using washers with carriage bolts provides several benefits: 1) Better load distribution, 2) Reduced risk of nut pulling into soft materials, 3) More consistent clamping force, and 4) Protection of material surface. We recommend always using washers for best results.

🚚 Fast Shipping & Construction Grade

Quick Dispatch & Outdoor Ready: Orders placed Monday-Friday are typically dispatched the next business day. These stainless steel carriage bolts are manufactured to exacting DIN603 standards, ensuring reliable performance for your construction, decking, fencing, and outdoor projects where corrosion resistance and self-locking design are essential.