Qi Sheng carriage bolts are commonly used in wood connections and certain metal assemblies where a smooth, rounded head is preferred. The square neck beneath the head helps prevent rotation during tightening, improving installation efficiency in many applications such as timber structures, fencing, and hardware fittings.
We offer carriage bolts in multiple sizes with options in materials and surface finishes to match indoor or outdoor environments. For B2B buyers, we can support stable supply, bulk packaging, and specification-based sourcing.
For quoting, please provide the required diameter, length, thread type, material/grade, finish, and target usage environment.

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Carriage Bolt/Mushroom Head Square Neck Bolt

  1. Complies with international standards such as ISO 8677, ASTM A307, and DIN 603
  2. Common materials include carbon steel (e.g., Q235, 45#), stainless steel (e.g., 304, 316), and alloy steel
  3. Classified as special-shaped fasteners, featuring a mushroom-shaped round headand a square neck under the head
  4. Strength grades typically range from 4.8 to 8.8