Carbon steel ASTM A325 Zinc Surface Hex cup Bolts High Strength
Hexagonal bolts, also known as hexagonal head screws, hexagon head
bolts, hexagon head screws, hexagon screws or mechanical bolts, are
a common choice in construction and maintenance.Hexagon head bolts,
commonly known as hexagon head cap screws, are bolts with hexagonal
or six-sided heads.Hexagon bolts have six heads, which is the
industry standard for forged head bolts.A common feature of
hexagonal head screws is the surface of the gasket directly below
the head to produce a better seal.A hexagon head screw bolt is
actually produced within a tighter tolerance range and can be used
anywhere with a hexagon head bolt.
everal concepts about high strength bolts. According to the
specification, the bolt performance grade is above 8.8, which is
called high strength bolt. The current national standard is only
listed in m39. Suitable for la.RGE size specification. Especially,
the length of high-strength bolts is more than 10 ~ 15 times, the
domestic production is still very short.
Difference between high strength bolts and ordinary bolts:
High strength bolts are larger than common bolts of the same
The material of ordinary bolts is made of Q 235 A 3).
High-strength bolt material 3 steel or other high-quality
materials, made after heat treatment, improve the strength.
The difference between the two is the difference in the strength of
From the perspective of raw materials:
High strength bolt is made of high strength material. Screw of high
strength bolt. Nuts and gaskets are made of high strength steel. 35
CrMoA and other common bolts made of Q235 steel.
From the strength grade point of view: the use of high-strength
bolts is becoming more and more extensive. Commonly used 8.8s and
10.9s two grade strength grade, of which 10.9 grade is the
majority. Bolt strength grade 10.9. E should be low, generally 4.4.
4.8 grade, grade 5.6 and 8.8.
From the point of view of stress characteristics: high strength
bolts apply pretension force and transfer external force through
friction. The shear force must be transferred when the nut is
tightened when the common bolt is shearing to the hole wall
pretension connection. The pretensile force is very small. In
addition to the high strength of the material, the high strength
bolt will also produce a large pretightening force, resulting in
extrusion force between the connectors. The friction force is
perpendicular to the screw. The bearing capacity of the high
strength bolt is direct.
According to stress characteristics. The bearing type and friction
type are divided. The two calculation methods are different. The Ed
should be used in the design of the minimum specification M12 for
common high strength bolts. Unstable performance of M 16 / M 30 and
super size bolts.
|Item||Black Structural Bolt Heavy Hex Head Bolts|
|Type||Flange Bolt,Carriage bolt, Guardrail bolt,Socket Bolt,T bolt,Square
bolt and Wing bolt|
|Grade||Gr4.8 Gr8.8 Gr2 Gr5 A325 A490|
|Standard:||DIN933,DIN931DIN6923.DIN603 DIN912 DIN444,DIN315,ASME B18.2.3,ASME
|Material||Stainless Steel: SS201 SS304/SS304L SS316/SS316L SS904L|
A2 A4 GR.B8 GRB8M
|Steel Grade: Gr.4.8,5.8,8.8,10.9,12.9; SAE: Gr.2,5,8;|
|Finishing:||Zinc(Yellow,White,Blue,Black,Colour),Hop Dip Galvanized(HDG),Black
Oxide,Geomet,Dacroment,Nickel plated,Zinc-Nickel plated,Telfon|
|Production Technique||Cold forging, Hot forming, Machining, Heat treatment, Staming, etc|
|Stock Products||Stainless steel: DIN6923 DIN912 DIN603 DIN315,DIN933,DIN931,DIN934|
riction type high strength bolt: suitable for steel frame structure
beam, column connection, solid net beam connection, industrial
workshop heavy crane beam connection. Brake system and important
structures under dynamic load. High strength bolts: shear
connections on the structure, allowing a small amount of sliding or
bearing indirect dynamic loads. Tensile high strength bolts: when
bolts are pulled out. The fatigue strength is very low. Under
dynamic load, its bearing capacity is not more than 0.6 Pu P, which
is the allowable axial force of bolt. Therefore, it is only
suitable for static load, such as flange butt joint T joint, etc
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