M16 Coach Bolts Stainless Steel

M16 coach bolts, also known as M16 carriage bolts, are manufactured to DIN 603 specification and are a great option for heavy-duty applications that require a secure and durable fastening. They feature a domed head that ensures a clean and finished appearance when fastened to wood or metal. The domed head serves as a protective and decorative feature, preventing accidental catching while avoiding ugly bolt head protrusion.

This size of metric bolts has a thread diameter of 16 millimetres.

M16 Coach Bolt Dimensions

  • Thread Diameter: 16mm
  • Thread Pitch: 2mm
  • Head Diameter: 37.2mm (max)
  • Head Height: 8.05mm
  • Specification: DIN 603 

Stainless Steel M16 Coach Bolts Durability

At Fixabolt we proudly offer a range of M16 coach bolts from 80mm long in stainless steel. Stainless steel M16 coach bolts are particularly popular due to their resistance to rust and corrosion and wide diameter, making them ideal for heavy-duty outdoor applications or environments exposed to moisture.

Longer sizes may have a shank for extra strength. Please contact us via our chat if this could be an issue. 

Choose stainless steel M16 coach bolts for your next project for robust construction, reliable fastening and A2 corrosion resistance. 

Please Note: Coach bolts may come fully threaded or partially threaded depending on source of manufacture.

If you're not after 16mm, browse our full range of stainless steel coach bolts.

11 products


M16 Coach Bolts – Stainless Steel (DIN 603 Carriage Bolts) | Fixabolt®

For the heavy-duty jobs. Clean finish. Maximum hold.

Fixabolt® M16 coach bolts are large-diameter carriage bolts designed for structural timber connections, outdoor construction, and high-load applications. Manufactured to DIN 603, each bolt features a domed mushroom head and a square neck that locks into timber or softer materials, preventing the bolt from spinning during tightening.

These bolts are ideal when you need strength, durability, and a smooth finish, especially when access is only available from one side.

Product Details

  • Thread Size: M16 (16mm diameter)
  • Standard: DIN 603 – mushroom head, square neck, full thread
  • Head Type: Round/domed head – tamper-resistant and snag-free
  • A2 stainless steel (304) – corrosion-resistant for general outdoor use
  • Lengths Available: 80mm to 200mm


Fixabolt® M16 coach bolts are ideal for:

  • Structural timber joints and wall plate fixing
  • Securing large fence posts, gates, and support beams
  • Landscaping builds and retaining walls
  • Fixing base plates, brackets, and steel-to-timber connections
  • Any outdoor project where strength and corrosion resistance matter

Just pre-drill your hole, tap the bolt into place, and tighten from the nut side. The square neck bites into the timber to stop rotation during installation.

Why Use Fixabolt® M16 Coach Bolts?

✔ Fully stainless – long-lasting and rust-resistant

✔ DIN 603 compliant for size and spec consistency

✔ Ideal for outdoor and structural timber use

✔ Trade pricing available for bulk orders

✔ Fast UK shipping and excellent customer support

Fixings that do the heavy lifting. Only from Fixabolt®.