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Carbon Steel Bolt

Steel Bolt

Bolt Size: M6 up to M70
Bolt Material: client specifications including B7, B7M, B8, B8M, L7, L7M ,A2, A4
Bolt Grades: 5.6,8.8,8.9,10.9 and 12,A2-70, A4-70 and all other Grades

Types of Bolts

In Petrol and chemical industry for flange connections Stud Bolts and Hex Bolts are being commonly used. The Stud Bolt is a full tyreaded rod with 2 heavy hexagonal  nuts, while the Hex Bolt has a head with one nut. Nuts and the head are both six sided.
Stud Bolts General Description 

The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange, diameter and length of bolts is dependent of flange type and Pressure Class of flange.Stud Bolt length are defined in ASME B16.5 standard. The length in inches is equal to the effective thread length measured parallel to the axis, from the first to the first thread without the chamfers (points). First thread is defined as the intersection of the major diameter of the thread with the base of the point.

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Standard Thread Pitches

  • 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 and in there where 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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