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Hex Head Bolt

What is Hex Head Bolt

Hex bolt with a hexagonal head and machined threads, functions in fastening 2 different parts with a nut, can be manufactured in different steel materials (stainless, carbon, alloy) 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.

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 can be customized according to drawing and specification provided by customer.

High Tensile Hex Head Bolt Supplied by Longteng

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.

Hex Head Bolt Specification

Hexagon Head Bolt Specification
Hex Bolt SizeM30-M80
Other Dimensions according to client’s requirement
Length40mm-300mm
Raw Material20MnTiB, 15Cr, 40Cr, 30CrMnSi and 15MnVB
Surface FinishPlain/black/ zinc plated/H.D.G./dacromet/nickle plated/cadmium plated, etc.
Strength GradeGrade 8.8, Grade 9.8, Grade 10.9, Grade 12.9
Warranty PolicyWe confirm our qualities satisfy to 99.9%, and have 6-month quality warranty
Hex Head Bolt StandardGB5782, GB5783
EN14399, EN15048
NoteFor 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 standardGB/T 5782 – 2016, GB/T 879.2-2000, ISO8753; JIS B2808; DIN 7346; ASME B18.8.2, etc

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.

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.

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
PPitch3.53.5444.54.5555.55.56
bL≤12566
125<L≤2007278849096102108116
L>200859197103109115121129137145153
cmax0.80.80.811111111
min0.20.20.20.30.30.30.30.30.30.30.3
damax33.436.439.442.445.648.652.656.6636771
dsmax=nominal size3033363942454852566064
Grade A (min)
Grade B (min)29.4832.3835.3838.3841.3844.3847.3851.2655.2659.2663.26
dwGrade A (min)
Grade B (min)42.7546.5551.1155.8659.9564.769.4574.278.6683.4188.16
eGrade A (min)
Grade B (min)50.8555.3760.7966.4471.376.9582.688.2593.5699.21104.86
L1 MAX6666881010121213
kNominal Size18.72122.52526283033353840
Grade A(max)
Grade A(min)
Grade B(max)19.1221.4222.9225.4226.4228.4230.4233.535.538.540.5
Grade B(min)18.2820.5822.0824.5825.5827.5829.5832.534.537.539.5
k1Grade A (min)
Grade B (min)12.814.4115.4617.2117.9119.3120.7122.7524.1526.2527.65
rmin11111.21.21.61.6222
smax=nominal size4650556065707580859095
Grade A (min)
Grade B (min)454953.858.863.168.173.178.182.887.892.8

Hex Head Bolt Size of GB/T 5783

Screw Thread
d
M30(M33)M36(M39)M42(M45)M48(M52)M56(M60)M64
PPitch3.53.5444.54.5555.55.56
amax10.510.5121213.513.5151516.516.518
min3.53.5444.54.5555.55.56
cmax0.80.80.811111111
min0.20.20.20.30.30.30.30.30.30.30.3
damax33.436.439.442.445.648.652.656.6636771
dwGrade A(min)
Grade B(min)42.7546.5551.1155.8659.9564.769.4574.278.6683.4188.16
eGrade A(min)
Grade B(min)50.8555.3760.7966.4471.376.9582.688.2593.5699.21104.86
kNominal Size18.72122.52526283033353840
Grade A(max)
Grade A(min)
Grade B(max)19.1221.4222.9225.4226.4228.4230.4233.535.538.540.5
Grade B(min)18.2820.5822.0824.5825.5827.5829.5832.534.537.539.5
k1Grade A (min)
Grade B (min)12.814.4115.4617.2117.9119.3120.7122.7524.1526.2527.65
rmin11111.21.21.61.6222
smax=nominal size4650556065707580859095
Grade A (min)
Grade B (min)454953.858.863.168.173.178.182.887.892.8

Difference Between Hex Head Bolt and Hex Head Screw

For hex head bolt and hex head screw are very similar small part, 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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