BULLET-PROOF BOLT

摘要

FIELD: construction.SUBSTANCE: bullet-proof bolt includes bar and head. The bolt is made of high-strength steel subjected to thermal hardening to 400-600 HB, and bolt head features at least one groove along its perimeter with the width of 0.1-0.5 of bolt head height and depth of 0.05-0.25 of bolt head diameter.EFFECT: improved connection reliability for structures designed to provide protection against bullets or shells.2 cl