8.8 HDG Carbon Steel M16 TO M36 Electrical Fasteners 

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number AS1252
Minimum Order Quantity 900kg
Price 1000USD/TON-1300USD/TON
Packaging Details 25KG/CTN,36CTN/PALLET or small packing
Delivery Time 30DAYS
Payment Terms L/C, T/T
Supply Ability 500TON/MONTH
Product Details
Standard AS1252 Material Carbon Steel
Size M16-M36 Finish ZP YZP HDG BLACK
Grade 8.8 10.9 Packing Carton And Pallet Or According To The Customer's Requirement
Sample Free Sample Thread Machine Thread
Lead Time Per On Order Quantity Type Hexagon Head
Advantage We Can Manufacture According To Client Design,OEM / ODM / Customized Service Provided Oem Yes,welcome
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HDG Electrical Fasteners 

,

M36 Electrical Fasteners 

,

M16 High Strength Bolts For Steel Structure

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Product Description

8.8 HDG Carbon Steel M16 TO M36 Electrical Fasteners

 

Specification

 

 

8.8 High-Tensile Structural Bolt AS1252

 
 

Allfasteners AS1252 structural bolts are a complete assembly of bolt, nut and washer. Selected by those who depend on quality products installed in there project to meet the requirements of Australian structural standards.

  • Class 8.8 high-tensile grade
  • Hot dipped galvanised
  • Metric thread
  • Manufactured to AS1252:1983 dimensions (1996 mechanical properties)

 

Screw Thread
d
M16 M20 (M22) M24 (M27) M30 M36
P Thread Pitch
b L≤125
125<L≤200
200<L
ds max
min
s max
min
e max
min
k max
min
2 2.5 2.5 3 3 3.5 4
38 46 50 54 60 66 78
44 52 56 60 66 72 84
- 65 69 73 79 85 97
16.7 20.84 22.84 24.84 27.84 30.84 37
15.3 19.16 21.16 23.16 26.16 29.16 35
27 34 36 41 46 50 60
26.16 33 35 40 45 49 58.8
31.2 39.26 41.6 47.3 53.1 57.7 69.3
29.56 37.29 39.55 45.2 50.85 55.37 66.44
10.75 13.4 14.9 15.9 17.9 19.75 23.55
9.25 11.6 13.1 14.1 16.1 17.65 21.45

 

8.8 HDG Carbon Steel M16 TO M36 Electrical Fasteners  0

 

 

 

 

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

 

Class4.8 Class5.8 Class6.8 Class8.8 Class10.9 Class12.9

NO. Mechanical or
physical property
Property class
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9
D≤16mma d>16mmb d≤16mm
1 Tensile strength
Rm,Mpa
nom.c 400 500 600 800 900 1000 1200
max. 400 420 500 520 600 800 830 900 1040 1220
2 Lower yield strength
ReL,Mpa
nom.c 240 —— 300 —— —— —— —— —— —— ——
max. 240 —— 300 —— —— —— —— —— —— ——
3 Stress at 0,2 % nonproportional elongation
Rp0.2,Mpa
nom.c —— —— —— —— —— 640 640 720 900 1080
max. —— —— —— —— —— 640 660 720 940 1100
4 Stress at 0,0048 d non-proportional elongation for
full-size fasteners
Rpf,Mpa
nom.c —— 320 —— 400 480 —— —— —— —— ——
max. —— 340e —— 420e 480e —— —— —— —— ——
5 Stress under proof load
Spf,Mpa
nom. 225 310 280 380 440 580 600 650 830 970
Proof Sp,nom/ReL min Or
strength Sp,nom/Rp0.2min Or
rati Sp,nom/Rpf min
 
0.94 0.91 0.93 0.9 0.92 0.91 0.91 0.9 0.88 0.88
6 Percentage elongation
after fracture for
machined test pieces,A,%
min. 22 -— 20 —— —— 12 12 10 9 8
7 Percentage reduction of area after
fracture for machined test pieces,Z,%
min. —— 52 48 48 44
8 Elongation after fracture for full-size
fasteners,Af
min. —— 0.24 —— 0.22 0.2 —— —— —— —— ——
9 Head soundness No fracture
10 Vickers hardness, HV,
F≥98N
min. 120 130 155 160 190 250 255 290 320 385
max. 220g 250 320 335 360 380 435
11 Brinell hardness, HBW
,F=30D²
min. 114 124 147 152 181 238 242 276 304 366
max. 209g 238 304 318 342 361 414
12 Rockwell hardness,HRB ,
HRB
min. 67 71 79 82 89  
max. 95g 99.5  
Rockwell hardness,
HRC
min. —— 22 23 28 32 39
max. —— 32 34 37 39 44
13 Surface hardness
HV 0.3
max. —— h h,j h,j
14 Height of non-decarburized thread zone,E,mm min. —— 1/2H1 2/3H1 3/4H1
Depth of complete decarburization in the
thread,G,mm
max. —— 0.015
15 Reduction of hardness after retempering,HV max. —— 20
16 Breaking torque,
MB,N·m
min. —— in accordance with ISO 898-7
17 Impact strength,
KVK,I,J
min. —— 27 —— 27 27 27 27 m
18 Surface integrity in accordance with ISO 6157-1n ISO 6157-3

a Values do not apply for structural bolting.
b For structural bolting d W M12.
c Nominal values are specified only for the purpose of the designation system for property classes.See Clause 5.
d In cases where the lower yield strength ReL cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation Rp0,2.
e For the property classes 4.8, 5.8 and 6.8 the values for Rpf min are under investigation. The present values are given for calculation of the proof stress ratio only. They are not test values.
f Proof loads are specified in Tables 5 and 7.
g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.
h Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination of both surface hardness and core hardness are carried out with HV 0,3.
i Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable.
j Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable.
k Values are determined at a test temperature of −20 °C, see 9.14.
l Applies to d W 16 mm. m Value for KV is under investigation.
n Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.


 

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

 

AS1252 Gr8.8 High Tensile Structural Bolts HDG

The bolts of AS1252 bolt nut washer assemble HDG Factory has machine screw threads on one end and hex head on the other with a washer face under the head for a better seal. These Bolts can tighten into a machine directly, because AS1252 bolt nut washer assemble HDG Factory has washers and nuts that are the same grade and finish as the hex bolt. Partially threaded shank allows for a stronger grip between objects and less shear movement.

AS1252 bolt nut washer assemble HDG Factory is composed of bolt, nut and washer. AS1252 bolt nut washer assemble HDG Factory has to pre-drill any holes for best result. Tighten these thumb screws with a wrench for more torque while fastening. These bolt nut washer assemble is suitable for fastening most machinery and equipment.

AS1252 bolts are headed, externally threaded fasteners used to keep two objects, often metal or wood, in a fixed position relative to one another. Unlike screws, which cut their own threads, bolts pair with the internal threads of nuts to stay in place and ensure the desired level of tension in the bolted joint. The use of nuts aids in disassembly and reassembly. In addition, bolts generally have a greater load bearing capacity than screws but lack a tapered shaft. The head style of the bolt determines the tool required for tightening and loosening. Bolts are responsible for holding together everything from furniture to machinery to bridges.

AS1252 bolts include fully threaded screws and partially threaded screws. Fully threaded screws engage with a tapped, threaded hole all the way to the head. Choose these when sideways force is not a concern. Partially threaded screws have an unthreaded portion under the head for more holding power when force is applied from the side. The unthreaded portion is stronger than the threaded portion of the screw. Thread length may vary from the minimum thread length published to fully thread.

AS1252 bolt nut washer assemble HDG Factory is designed for high load applications requiring a high tensile strength, especially those connecting steel to steel, such as the construction of bridges and buildings. AS1252 bolt nut washer assemble HDG Factory has to pre-drill any holes for best result and to use washers and nuts that are a similar grade and finish. Tighten these thumb screws with a wrench for more torque while fastening.

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