Hex head bolt standards
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What are bolts referred to as those whose distance between the opposite sides of the hex head used for tightening the internal and external compression bolts in the thread lock ring is less than the diameter of the through-threaded stud? Are there any corresponding standard requirements for such bolts?
Could it be an internal hex set screw? National standards: GB/T77, GB/T78, GH/T79, GB/T80; International standards: ISO4026, 4027, 4028, 4029. American Standard ASME B18.3