Stud bolts are a relatively long rod that is threaded on both ends. The rod may be threaded completely. They are designed to be used in tension.
- Coarse thread series (UNC/UNRC) is the most widely used thread system and applied in most of the screws, bolts and nuts. Coarse threads are used for threads in low strength materials such as iron, mild steel, copper and softer alloy, aluminium, etc.. The coarse thread is also more tolerant in adverse conditions and facilitate quick assembly.
- Fine thread series (UNF/UNRF) is commonly used in precision applications where they require a higher tensile strength than the coarse thread series.
- 8 – Thread series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. This series is mostly used for diameters one inch and above.
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