The inspection standard for tire bolts is: the tire bolts are complete and not loose.
A bolt is a type of fastener consisting of a head and a screw (a cylinder with external threads), which needs to be matched with a nut to fasten and connect two parts with through holes. Mechanical parts, cylindrical threaded fasteners with nuts. Divided into ordinary bolts and high-strength bolts, and high-strength bolts are high-strength bolts, which belong to a standard part. A very important feature of high-strength bolts is that they are limited to one-time use, generally used for connection, and repeated use is strictly prohibited. According to the stress state, it is divided into: friction type and pressure type; according to the construction technology, it is divided into: torsional shear type high-strength bolts and large hexagonal high-strength bolts.
Bolt inspection items:
Torque detection, torque detection, hardness detection, anti-slip coefficient detection, effective torque, locking performance, torque coefficient, fastening axial force, friction coefficient, anti-slip coefficient, screw-in test, gasket elasticity, toughness, hydrogen embrittlement Test, flattening, flaring, hole reaming test, bending, (single-sided, double-sided) shear test, pendulum impact, stress relaxation, high temperature creep, stress endurance test, lateral vibration, fatigue test, metallographic analysis ( microstructure analysis, microhardness test), chemical composition test, etc.
Bolt inspection standard:
GB/T3098.1-2010 Mechanical properties of fasteners Bolts, screws and studs
ISO898-1 Mechanical properties of carbon and alloy steel fasteners
GB/T3934 Specifications for Ordinary Thread Gauge
Mechanical properties of ISO3506 corrosion-resistant steel fasteners
GB/T5779.1-2000 Surface defects of fasteners General requirements for bolts, screws and studs
GB/T3098.6-2000 Mechanical properties of fasteners Stainless steel bolts, screws and studs
GB/T16938-2008 General technical conditions for fastener bolts, screws, studs and nuts
GB/T16823.3-1997 Tightening test method for threaded fasteners
JB/T9151.1-1999 Fastener Test Method Size and Geometric Accuracy Bolts, Screws, Studs and Nuts
SJ2495-1984 fastener self-tapping thread, etc.
Post time: Dec-12-2022