ANSI ASME B18.2.1 HIGH QUALITY HEX BOLTS Gr2 Gr5 Gr8 with HDG YZP ZP BLACK 1/4~1-1/2" all kind of length UNC UNF

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number ANSI 1/4” to 3"
Minimum Order Quantity 900kg
Price 1100-1500USD/TON
Packaging Details 25kg Carton+900kg/Pallet
Delivery Time 30days
Payment Terms L/C, T/T,OA
Supply Ability 500TON/MONTH
Product Details
Material Carbon Steel Size 1/4~1-1/2
Surface Treatment Plain,Zinc,Black,H.D.G Grade 2/5/8
Process Cold Forging,Hot Forging Sample Free Sample
Packaging 25kg Carton+900kg/Pallet
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Product Description

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B, A325 and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.

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Manufacturing

QBH Bolt manufactures hex bolts from 1/4″ diameter through 3″ diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company’s name and/or logo.

 

 

High-Strength Grade 8 Steel Hex Head Screws

 

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.

Zinc yellow-chromate plated steel screws resist corrosion in wet environments. Zinc-aluminum-coated steel screws are about five times as corrosion resistant as zinc yellow-chromate plated screws and have good resistance to salt water and acids. Also known as ultra coat and armor coat. To maintain corrosion resistance, use these screws with zinc-aluminum-coated nuts and washers.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

Screws that meet ASTM A354BD or SAE J429 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.2.1 or ASME B18.6.3 comply with specifications for dimensional standards.

 

 

 

ANSI ASME B18.2.1 HIGH QUALITY HEX BOLTS  Gr2  Gr5  Gr8 with HDG YZP ZP BLACK 1/4~1-1/2" all kind of length  UNC  UNF 0

 

Screw Thread
d
1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8
PP UNC
UNF
8-UN
ds max
min
s max
min
e max
min
k max
min
r max
min
b L≤6
L>6
20 18 16 14 13 11 10 9 8 7 7 6
28 24 24 20 20 18 16 14 12 12 12 12
- - - - - - - - - 8 8 8
0.26 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404
0.237 0.298 0.36 0.421 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345
0.438 0.5 0.562 0.625 0.75 0.938 1.125 1.312 1.5 1.688 1.875 2.062
0.425 0.484 0.544 0.603 0.725 0.906 1.088 1.269 1.45 1.631 1.812 1.994
0.505 0.577 0.650 0.722 0.866 1.083 1.299 1.516 1.732 1.949 2.165 2.382
0.484 0.552 0.620 0.687 0.826 1.033 1.240 1.447 1.653 1.859 2.066 2.273
0.188 0.235 0.268 0.316 0.364 0.444 0.524 0.604 0.7 0.78 0.876 0.94
0.15 0.195 0.226 0.272 0.302 0.378 0.455 0.531 0.591 0.658 0.749 0.81
0.030 0.030 0.030 0.030 0.030 0.060 0.060 0.060 0.090 0.090 0.090 0.090
0.010 0.010 0.010 0.010 0.010 0.020 0.020 0.020 0.030 0.030 0.030 0.030
0.7500 0.8750 1.0000 1.1250 1.2500 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000
1.0000 1.1250 1.2500 1.3750 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.2500

 

Screw Thread
d
1-1/2 1-5/8 1-3/4 1-7/8 2 2-1/2 2-3/4 3 3-1/4 3-1/2 3-3/4 4
PP UNC
UNF
8-UN
ds max
min
s max
min
e max
min
k max
min
r max
min
b L≤6
L>6
6 - 5 - 4-1/2 4 4 4 4 4 4 4
12 - - - - - - - - - - -
8 8 8 8 8 8 8 8 8 8 8 8
1.531 1.658 1.785 1.912 2.039 2.559 2.827 3.081 3.335 3.589 3.858 4.111
1.47 1.591 1.716 1.839 1.964 2.461 2.711 2.961 3.21 3.461 3.726 3.975
2.25 2.438 2.625 2.812 3 3.75 4.125 4.5 4.875 5.25 5.625 6
2.175 2.356 2.538 2.719 2.9 3.625 3.988 4.35 4.712 5.075 5.437 5.8
2.598 2.815 3.031 3.248 3.464 4.330 4.763 5.196 5.629 6.062 6.495 6.928
2.480 2.616 2.893 3.099 3.306 4.133 4.546 4.959 5.372 5.786 6.198 6.612
1.036 1.116 1.196 1.276 1.388 1.708 1.869 2.06 2.251 2.38 2.572 2.764
0.902 0.978 1.054 1.13 1.175 1.479 1.632 1.815 1.936 2.057 2.241 2.424
0.090 0.090 0.120 0.120 0.120 0.190 0.190 0.190 0.190 0.190 0.190 0.190
0.030 0.030 0.040 0.040 0.040 0.060 0.060 0.060 0.060 0.060 0.060 0.060
3.2500 3.5000 3.7500 4.0000 4.2500 5.2500 5.7500 6.2500 6.7500 7.2500 7.7500 8.2500
3.5000 3.7500 4.0000 4.2500 4.5000 5.5000 6.0000 6.5000 7.0000 7.5000 8.0000 8.5000

 

 

 

 

 

Mechanical property :SAEJ429

 

ANSI ASME B18.2.1 HIGH QUALITY HEX BOLTS  Gr2  Gr5  Gr8 with HDG YZP ZP BLACK 1/4~1-1/2" all kind of length  UNC  UNF 1

 

Process flow

Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need)Finish Packing

 

Hot forging

Cutting material hot forging turning ➨ shrink diameter(half thread) ➨thread rolling make heat treatment(if need)Finish Packing

 

 

 

 

 

Product Grade

 

Grade2 Grade5 Grade8

 

 

Materials and Chemical compstition

 

 

 

1008

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu Al
0.06 0.06 0.33 0.013 0.003 0.01 0 0.01 0.028

 

 

1035

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu
0.34 0.13 0.73 0.012 0.002 0.02 0.01 0.02

 

 

10B21

CHEMICAL COMPOSI %
C Si Mn P S Cr B
0.2 0.04 0.81 0.017 0.007 0.017 0.0021

 

 

1045

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu
0.45 0.23 0.58 0.014 0.006 0.057 0.008 0.016

 

40CR

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu
0.4 0.21 0.54 0.015 0.008 0.95 0.02 0.02

 

35CRMO

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu Mo
0.35 0.22 0.59 0.01 0.003 0.93 0.01 0.01 0.21

 

 

42CRMO

CHEMICAL COMPOSI %
C Si Mn P S Cr Ni Cu Mo
0.42 0.27 0.92 0.013 0.004 1.01 0.03 0.04 0.2

 

 

Finish

 

PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON

 

 

PACKING

 

QBH BULK

20-25KG/CTN,36CTNS/PALLET

20-30KG/BAGS,36BAGS/PALLET

ONE TON/BOXES

50KG/ IRON DRUM,12 IRON DRUMS/PALLET

 

QBH SMALL PACKING

Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements

 

QBH PALLET TYPE

SOLID WOOD FUMIGATION PALLET

EURO Pallet

THREE SPLINT PALLET

WOODEN BOX

 

 

The advantages of QBH

  • QBH brand sales to the main quality assurance.
  • Years of export trade management, excellent service, word-of-mouth guarantee.
  • By working with TUV,escort for quality.
  • Customization of non-standard parts can be made according to customer's requirements and drawings.
  • For quality customers,we can provide a certain credit period.
     

Product application

 

Hex bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. Hex bolts with forged heads are also commonly used as headed anchor bolts

 

 

 

 

What are the differences between a hex cap screw and a hex bolt?

 

These terms are often incorrectly used interchangeably. The most basic difference between a cap screw and a bolt is the way in which these fasteners are installed. Technically, a bolt is installed by turning a nut to tighten the fastener, while a cap screw in installed by turning the head of the bolt to assemble and tighten. Therefore, cap screws are often threaded into a tapped hole on a piece of equipment or machinery or installed in some other OEM application.

The variations between these fasteners are fairly significant both from a manufacturing and dimensional perspective as well as an application standpoint. Generally speaking, hex cap screws are used in precise applications like an OEM setting where tight tolerances are required. Hex bolts are often specified when the mechanical properties are more important than dimensional tolerances, like the construction industry. For example, SAE J429 Grade 2 is typically provided as a hex cap screw, whereas ASTM A307-A is a common hex bolt specification.

Below is an overview of some of the specifics these fasteners are required to meet.

Hex cap screws

  • Flat washer facing under the head that meet specific tolerances as described under ASME B18.2.1-1996.
  • They will usually be manufactured by a cold-heading process (large runs of standard sizes) or turned CNC operation.
  • A radius under the head at the shank.
  • Body diameter of plus nothing, minus .011″ for an 1-1/4″ diameter fastener.
  • Some common fastener specifications unless otherwise specified: ASTM A449 and SAE J429 Grade 2, 5, and 8.

Hex bolts

  • A die seam across the bearing surface is permissible.
  • The typical bolt is manufactured by hot-forging process.
  • Allows a reduced body diameter to be not less than the minimum pitch diameter of the thread.
  • Some common fastener specifications unless otherwise specified: ASTM A307A, A354, and F1554.

This list is not inclusive, but represents some of the differences between these two designations. There is flexibility to use other materials, grades, and bolt standards as agreed by manufacturer and purchaser. So, be cautious when ordering bolts make sure you are clear about whether your projects requires cap screws or bolts.