ASTM A193,B7, B7M B16, B5 ASTM A320 L7, L7M L43
ASTM A 193 B8 & B8M Class I & 2 B8A B8MA, B8T ASTM A320 B8 & B8M Class 1 & 2 B8A B8MA
Grade 660 Monel Inconel Hastelloy Alloy 20 Brass Titanium
ASTM A 194 Grade 2H 2HM, 4 ,7, 3, 6, 8, 8M, 8A, 8MA
The function of the indicator Stud bolt is to evidence at all times the dynamic stresses that it undergoes and if these stresses are within the limits of the design of the system. The values that are verified are the length variations of the torque element; this variation is a direct relation of the following two parameters:
Indicator studbolts can be made in low-alloy,austentic,ferritic steels,duplex and superduplex grades, in relation to the ambient conditions.
For alloy steel studbolts it is best to use for the indicator rods materials such as Alloy C-276 whose K coefficient is similar if not the same to that of the material used for the studbolt.