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What Is High Tensile Bolts?


Understanding high tensile bolts, fastener strengths and grades. What is the difference between a bolt, screw and a stud? Grades of bolts in common in use in Australia. – PowerPoint PPT presentation

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Title: What Is High Tensile Bolts?

What is High Tensile Bolts?
  • Understanding High Tensile Bolts/Fasteners Grades.

Engineers, construction, automobile,
manufacturing and a lot of services industry
professionals know the answer to this and many
other technical questions about fasteners and
fixings. But a lot of us have questions, what
are these numbers on some fasteners and fixings
we come across in our garage, some furniture and
other household stuff. Before we answer what is
high tensile bolts, here are a few things you
need to know about fasteners and fixings or bolts.
Go to following slides and find out
Commonly, most of us know fasteners as bolts,
screws or studs. So what is the difference
between a bolt, screw and stud?
What is a Nut Bolt?
The threaded rod that you see in this picture is
a bolt Alongside is a nut and it is often mated
with a bolt.
What is a Screw?
A screw is slightly different than a bolt. Screws
are externally threaded fasteners. Screws have
the ability of forming its own thread when
inserted into the holes inside assembled parts.
What is a Stud?
Stud is different from both bolt and screw in
appearance and uses. It does not have head at one
end like a normal fastener. Studs are metal rods
or you could say shafts with threads on both
sides or both ends.
So what are those numbers that we see in most of
the fasteners?
These numbers on fasteners and fixings represent
the ultimate tensile strength of a bolt. In
Australia, there are 3 different grades of bolts
in common use. Commercial Grade Structural
Grade High Tensile
Commercial Grade This is the lowest grade with a
tensile strength of 4.6 or 400 MPa. Structural
Grade Structural grade comes next with a tensile
strength of around 800 MPa or 8.8. High
Tensile High tensile bolts are the highest grade
with an ultimate tensile strength of 1200 MPa
or 12.9
Presentation of THE WDS GROUP. Australias one
stop specialised fastener and fixings specialist.
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