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Large Hex Head Bolt(M30-M80)

Hot Sale Hex Head Bolt Standards:

What is Large Size Hex Head Bolt

Large size (M30-M80) Alloy Hex head bolt with a hexagonal head and machined threads, functions in fastening 2 different parts with a nut, can be manufactured in alloy steel materials (42CrMo, 40CrNiMoA, 35CrMo, 20MnTiB) and into various sizes for specific uses, which is designed to be installed using a spanner. Hexagon bolts are also generally available in large sizes.

Available standard for hexagonal head bolt product

Most common Standards for high strength hexagonal head bolt are EN14399, EN15048, ISO 4014, ISO 4017, DAst 021, etc.

Longteng is a professional large size (M30-M80) high tensile hex head bolt manufacturer, we sell large size hex bolt for high precision, heavy-duty fastening application, widely used in structural and industrial industries, automotive to marine, coastal, and high-temperature environments. Our Hex Head are featured with high tensile strength, cost-effective and wear and tear-resistant, high temperature and low-temperature applications.

Hex Head Bolt Parts Supplied from Factory

Alloy Hex head bolt (M30-M80) can be customized according to drawing and specification provided by customer.

EN14399EN15048
High Strength Structural Bolting assemblies for preloadingNon-preloaded Structural Bolting and Assemblies
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(M30-M80)Hex Head Bolt Production

(M30-M80)High Tensile Alloy Hex Head Bolt Supplier

Hexagon head bolt, in short, hex bolt, has many other names: hexagon bolt, hexagonal bolt, hex head screw, machine bolt, etc. Longteng supplies large size hex head bolt from M30-M80 of high tensile strength, for our hex head bolt is hardened through heat treatment.

According to its thread, it can be classified as half thread hex bolt and full thread hex bolt. High-Grade hex head bolts of 8.8, 9.8, 10.9, 12.9 can be supplied for application in high-temperature environments, marine and coastal operations for high anti-corrosion property.

(M30-M80)Hex Head Bolt Specification

Hexagon Head Bolt Specification
Hex Bolt Size M30-M80
Other Dimensions according to client’s requirement
Length 40mm-300mm
Raw Material 42CrMo, 40CrNiMoA, 35CrMo, 20MnTiB.
Surface Finish Plain/black/ zinc plated/H.D.G./dacromet/nickle plated/cadmium plated, etc.
Hex Head Bolt Strength Grade Grade 8.8, Grade 9.8, Grade 10.9, Grade 12.9
Nut Strength Grade Grade 8, Grade 10, Grade 12
Bolt Washer Strength Grade 200HV, 300HV
Warranty Policy We confirm our qualities satisfy to 99.9%, and have 6-month quality warranty
Hex Head Bolt Standard
(GB, ISO, JB/ZQ, DIN, EN)
ISO 4014, ISO 4017 EN 14399/DIN 6914/DIN 6915/ DIN 6916
EN14399, EN15048
Note For customized products, Please inform the exact specification of inquiry such as Material, Grade, size etc.
if it is special and non-standard products, please supply the drawing or Photos or Samples to us.
Pin standard ISO 4014, ISO8753; JIS B2808; DIN 7346; ASME B18.8.2, etc

(M30-M80)Hex Bolt Equivalent Standard (ISO DIN)

GB ISO DIN
GB5782 ISO4014 DIN931
GB5873 ISO4017 DIN933

(M30-M80)Hexagon Bolt Types

According to the thread length of hex bolt, Longteng supplies both half thread hexagon bolt and full thread hexagon bolt.

Half Thread Hexagon Bolts

Half Thread Hexagon Bolts are produced with an unthreaded part on the bolt, which keeps the bolt with higher strength than a fully threaded hex bolt. Unthreaded part is suitable for the purpose of anti-vibration or used as a dowel, or a component can rotate around it. Fasten and fix the component with the help of a hex nut.

Full Thread Hexagon Bolts

Full Thread Hexagon Bolts, or named hexagon screws, are fully threaded on the bolt below the bolt head. It is designed to fasten the component with no extra space left, the fastening doesn’t need a nut but requires the fastening hole to be threaded. So it functions as the fastening of 2 fully threaded parts. Longteng supplies fully thread hex bolts which can be inserted into threaded hole completely.

(M30-M80)Hex Head Bolt CE Certification:

Longteng hex head bolt fastener product has passed EN15048-1 (non-preloaded bolt assembly) and EN14399-1 (preloaded bolt assembly) certification. Non-preloaded bolt components must comply with EN 15048. Pretension bolt assembly must comply with EN14399.

For size requirements, relevant product standards (ISO4017, ISO4014, ISO 4032, ISO7091, ISO7090 or ISO7098, etc.) should be used. Pre-tensioning bolt assembly-System HR needs to comply with EN14399 part 3, HR nut complying with EN14399-3, and part 5 or part 6 washers, depending on the usage.

(M30-M80) Hex Head Bolt Dimension and Size

Hex Head Bolt Size of GB /T 5782

Screw Thread
d
M30 (M33) M36 (M39) M42 (M45) M48 (M52) M56 (M60) M64
P Pitch 3.5 3.5 4 4 4.5 4.5 5 5 5.5 5.5 6
b L≤125 66
125<L≤200 72 78 84 90 96 102 108 116
L>200 85 91 97 103 109 115 121 129 137 145 153
c max 0.8 0.8 0.8 1 1 1 1 1 1 1 1
min 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
da max 33.4 36.4 39.4 42.4 45.6 48.6 52.6 56.6 63 67 71
ds max=nominal size 30 33 36 39 42 45 48 52 56 60 64
Grade A (min)
Grade B (min) 29.48 32.38 35.38 38.38 41.38 44.38 47.38 51.26 55.26 59.26 63.26
dw Grade A (min)
Grade B (min) 42.75 46.55 51.11 55.86 59.95 64.7 69.45 74.2 78.66 83.41 88.16
e Grade A (min)
Grade B (min) 50.85 55.37 60.79 66.44 71.3 76.95 82.6 88.25 93.56 99.21 104.86
L1 MAX 6 6 6 6 8 8 10 10 12 12 13
k Nominal Size 18.7 21 22.5 25 26 28 30 33 35 38 40
Grade A(max)
Grade A(min)
Grade B(max) 19.12 21.42 22.92 25.42 26.42 28.42 30.42 33.5 35.5 38.5 40.5
Grade B(min) 18.28 20.58 22.08 24.58 25.58 27.58 29.58 32.5 34.5 37.5 39.5
k1 Grade A (min)
Grade B (min) 12.8 14.41 15.46 17.21 17.91 19.31 20.71 22.75 24.15 26.25 27.65
r min 1 1 1 1 1.2 1.2 1.6 1.6 2 2 2
s max=nominal size 46 50 55 60 65 70 75 80 85 90 95
Grade A (min)
Grade B (min) 45 49 53.8 58.8 63.1 68.1 73.1 78.1 82.8 87.8 92.8

Hex Head Bolt Size of GB/T 5783

Screw Thread
d
M30 (M33) M36 (M39) M42 (M45) M48 (M52) M56 (M60) M64
P Pitch 3.5 3.5 4 4 4.5 4.5 5 5 5.5 5.5 6
a max 10.5 10.5 12 12 13.5 13.5 15 15 16.5 16.5 18
min 3.5 3.5 4 4 4.5 4.5 5 5 5.5 5.5 6
c max 0.8 0.8 0.8 1 1 1 1 1 1 1 1
min 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
da max 33.4 36.4 39.4 42.4 45.6 48.6 52.6 56.6 63 67 71
dw Grade A(min)
Grade B(min) 42.75 46.55 51.11 55.86 59.95 64.7 69.45 74.2 78.66 83.41 88.16
e Grade A(min)
Grade B(min) 50.85 55.37 60.79 66.44 71.3 76.95 82.6 88.25 93.56 99.21 104.86
k Nominal Size 18.7 21 22.5 25 26 28 30 33 35 38 40
Grade A(max)
Grade A(min)
Grade B(max) 19.12 21.42 22.92 25.42 26.42 28.42 30.42 33.5 35.5 38.5 40.5
Grade B(min) 18.28 20.58 22.08 24.58 25.58 27.58 29.58 32.5 34.5 37.5 39.5
k1 Grade A (min)
Grade B (min) 12.8 14.41 15.46 17.21 17.91 19.31 20.71 22.75 24.15 26.25 27.65
r min 1 1 1 1 1.2 1.2 1.6 1.6 2 2 2
s max=nominal size 46 50 55 60 65 70 75 80 85 90 95
Grade A (min)
Grade B (min) 45 49 53.8 58.8 63.1 68.1 73.1 78.1 82.8 87.8 92.8

Difference Between Hex Head Bolt and Hex Head Screw

For hex head bolt and hex head screw are very similar small parts, many people can get mixed on their classification, For a hex head bolt is an externally threaded fastener designed for insertion through the (threaded or unthreaded) holes in assembled parts, and can be tightened or released by adjusting a nut.

A hex head screw works with no nut, and shall be inserted into threaded holes in the assembled parts, the thread form shall match with the threaded hole, or it can forming its own thread with external force, and of being tightened or released by adjusting the bolt head.

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