Galvanized Double-End Stud to GB/T 897 (bm=1d)

Thegalvanized double-end stud to GB/T 897 is a threaded stud with a screw-in end of full nominal diameter (bm = 1d) and a nut end, both ends threaded to receive nuts. Supplied in galvanized carbon steel, it is used for marine flange and structural connections where a through-bolt is impractical, working with a nut and washer at each end.

What Is a GB/T 897 Double-End Stud?

GB/T 897 covers double end studs with a screw-in length of one nominal diameter (bm = 1d) at the stud end. The two threaded ends allow a fixed component to be driven onto the stud end and secured by a nut on the opposite end. This configuration suits fastening into tapped holes or between two parts in ship structure and equipment where a conventional bolt head cannot be used.

Marine Applications

Note: the following applications are based on typical industry practice for shipyard standard fixings; actual use should follow the vessel design documents.

Specifications & Materials

Why Choose sinofastener for Your Double-End Studs?

Standards Reference

• GB/T 897 – Studs, screw-in end = 1d
• GB/T 898 – Studs, screw-in end = 1.25d (option)
• GB/T 3098.1 – Mechanical properties of fasteners, bolts/screws/studs
• GB/T 193 – Metric coarse pitch threads
• GB/T 5267.1 – Electroplated coating, or GB/T 13912 – Hot dip galvanizing

FAQ

What does bm = 1d mean for a double-end stud?

BM is the screw-in (stud) end length expressed as a multiple of the nominal diameter d. For GB/T 897 the screw-in length equals the diameter (1d), the shortest of the common double-end stud series.

Why use a double-end stud instead of a bolt?

A double-end stud allows a component to be screwed onto a fixed stud and secured by a nut, or connects two tapped parts, where a bolt head would interfere or a through-hole is not available.

Can you confirm thread lengths for a specific size?

Yes, thread lengths of the stud end and nut end follow GB/T 897. For your bill of materials we can confirm exact dimensions before shipment.