What grade are high strength bolts?
High tensile steel bolts Grade 8.8 high tensile steel is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc. It can be plated in many other coatings.
What is the difference between a common bolt and a high strength bolt?
Ordinary bolts are generally made of ordinary steel (Q235) and only need to be tightened. Ordinary bolts are generally 4.4, 4.8, 5.6 and 8.8 class. High-strength bolts are generally 8.8 and 10.9 class, of which 10.9 class are mostly. The screw holes of ordinary bolts are not necessarily larger than high-strength bolts.
What is the difference between A325N and A325X?
My company is looking to purchase A325SC, A325N, and A325X heavy hex structural bolts. What is the difference between these three? There is no difference between these bolts. The “X”, “SC”, and “N” simply identify the type of connection the bolts are used in.
What is ASTM F3125?
ASTM F3125 is a standard material specification covering chemical, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel in inch dimensions, in two strength grades, two types and two styles.
How do you identify HT bolts?
First step is to check to see if there are any head markings. The head markings, if present, will indicate if the bolt setscrew is metric or imperial.
What are the CSA Standards for high-strength bolts?
In Canada, structural design and inspection of bolted joints and installation of high-strength bolts should comply with CSA Standard S6 or provincial specifications for road bridge structures and S16 for building and other structures to which S16 applies.
What is the RCSC specification for Structural Joints using high strength bolts?
The Research Council on Structural Connections (RCSC) Specification for Structural Joints Using High-Strength Bolts provides state-of-the-art criteria for design and installation of ASTM high-strength bolts and assemblies. These recommendations become mandatory if and when the local code adopts them.
What are the RCSC standard S6 and S16 bolts?
These standards adopt many recommendations in the RCSC Specification but not all and certainly not all at the same time. In addition, S6 and S16 adopt ASTM specifications for high-strength bolts and bolt assemblies, e.g. ASTM A325 and F1852, by reference.
Is there a ‘standard torque table’ for pretensioning high strength bolts?
ANSWER: The use of ‘standard torque table’ for pretensioning high strength bolts was discontinued several decades ago. When pretensioning is required, CSA Standard S16 recognizes three bolt installation methods: