ASTM A325M is a Screw fastener product standard in the United States, equivalent to Grade 8.8. It is an American standard high-strength Bolt widely used in industries such as industrial high and medium pressure valves, petrochemical industry, pressure vessels, fluid engineering, nuclear power machinery, ocean shipping, new energy, and new environmental protection equipment.
1. According to the stress mode of the connection, there are ordinary and reamed holes. The bolts used for reaming holes should match the size of the holes and be used when subjected to lateral forces,Galvanized High-strength Bolts,ASTM A325M Bolt,High Quality High Strength Stud Bolt
2. According to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc. Generally, countersunk heads are used in places where the surface is required to be smooth and not protruding after connection, because countersunk heads can be screwed into the parts. Round heads can also be screwed into the parts. The tightening force of square heads can be larger, but the size is large. Hexagonal heads are the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head and the rod, which can prevent the bolts from loosening when subjected to vibration.
Some bolts with no threads on the bare rod need to be made thin, called slim waist bolts. This type of bolt is beneficial for connection under variable forces.
There are specialized high-strength bolts on the steel structure. The head will be larger and the size will also change.
Additionally, there are special uses for T-groove bolts, which are most commonly used in machine tool fixtures. They have a special shape and require cutting off both sides of the head. Anchor bolts are used for connecting and fixing machines to the ground, and there are many different shapes, such as U-bolts, as mentioned earlier.
There are also specialized studs for welding, with threads on one end and no threads on the other end, which can be welded to the parts while directly tightening the nuts on the other side,Galvanized high-strength A325M bolt
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