ISO4762 Class 8.8 HDG BLACK ZP YZP Carbon Steel Bolt

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number ISO4762
Minimum Order Quantity 900KG
Price 1000USD-1500USD/TON
Packaging Details 25KG/CTN,36CTN/PALLET or small packing
Delivery Time 30DAYS
Payment Terms L/C, T/T,OA
Supply Ability 600TON/MONTH
Product Details
STANDARD ISO4762 SIZE M5-M52
LENGTH ALL KIND OF LENGTH Material Carbon Steel
Samples Free Samples Surface HDG YZP ZP BLACK
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ISO4762 Carbon Steel Bolt

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10.9 Carbon Steel Bolt

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8.8 Hexagon Socket Head Cap Screw ISO 4762

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Product Description

Specification

 

 

Socket head cap screws are commonly used in machine assembly for removable panels and parts. They have a round cap with a hex head and are tightened with a socket wrench drive. Longer caps are easier to see when fastened, while button and flat head caps are less likely to snag clothing or linkages. Cap screws with a black oxide or armor coat finish resist corrosion.

 

 

Black-oxide steel screws are mildly corrosion resistant in dry environments. Zinc-plated steel screws

resist corrosion in wet environments. The screws with a blue-dyed finish are easy to distinguish.

Zinc-flake-coated steel screws are 20 times as corrosion resistant as zinc-plated screws and

comparable to Dacromet-coated screws. Zinc-aluminum-coated steel screws are 40 times as

corrosion resistant as zinc-plated screws and comparable to Magni-coated screws. They withstand

1,000 hours of salt spray per ASTM B117.

 

Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads

per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer

the thread, the better the resistance. They are not compatible with coarse threads.

 

Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing

requirements for material quality. Screws that meet ASME B18.3, ASME B18.3M, ISO 21269, and

ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

 

 

ISO 4762 - Hexagon socket Head Cap Screws

Current norm: DIN EN ISO 4762
Equivalent norms: DIN 912; CSN 021143; PN 82302; UNI 5931;

ISO4762 Class 8.8 HDG BLACK ZP YZP Carbon Steel Bolt 0

 

 

 

 

Legend:

d - the nominal diameter of the thread
k - head height
t - groove depth
dk - head diameter
L - length of bolt
s - size of the internal hexagon

Makings:QBH

Steel: 8.8, 10.9, 12.9
Stainless: A2, A4
Plastic: -
Non Ferrous: -
Thread: 6g, 5g6g for strength 12.9

 

Thread Size
d
M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12
P Pitch
b thread length
dk max For plain heads
For knurled heads
min
k max
min
s max
min
t min
da max
ds min
max
w min
0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75
15 16 17 18 20 22 24 28 32 36
3 3.8 4.5 5.5 7 8.5 10 13 16 18
3.14 3.98 4.68 5.68 7.22 8.72 10.22 13.27 16.27 18.27
2.86 3.62 4.32 5.32 6.78 8.28 9.78 12.73 15.73 17.73
1.6 2 2.5 3 4 5 6 8 10 12
1.46 1.86 2.36 2.86 3.82 4.82 5.82 7.78 9.64 11.57
1.56 1.56 2.06 2.58 3.08 4.095 5.14 6.14 8.175 10.175
1.52 1.52 2.02 2.52 3.02 4.02 5.02 6.02 8.025 10.025
0.7 1 1.1 1.3 2 2.5 3 4 5 6
2 2.6 3.1 3.6 4.7 5.7 6.8 9.2 11.2 13.7
1.46 1.86 2.36 2.86 3.82 4.82 5.82 7.78 9.78 11.73
1.6 2.0 2.5 3.0 4.0 5.0 6.0 8.0 10.0 12.0
0.55 0.55 0.85 1.15 1.4 1.9 2.3 3.3 4 4.8

 

Thread Size
d
(M14) M16 M20 M24 M30 M36 M42 M48 M56 M64
P Pitch
b thread length
dk max For plain heads
For knurled heads
min
k max
min
s max
min
t min
da max
ds min
max
w min
2 2 2.5 3 3.5 4 4.5 5 5.5 6
40 44 52 60 72 84 96 108 124 140
21 24 30 36 45 54 63 72 84 96
21.33 24.33 30.33 36.39 45.39 54.46 63.46 72.46 84.54 96.54
20.67 23.67 29.67 35.61 44.61 53.54 62.54 71.54 83.46 95.46
14 16 20 24 30 36 42 48 56 64
13.57 15.57 19.48 23.48 29.48 35.38 41.38 47.38 55.26 63.26
12.212 14.212 17.23 19.275 22.275 27.275 32.33 36.33 41.33 46.33
12.032 14.032 17.05 19.065 22.065 27.065 32.08 36.08 41.08 46.08
7 8 10 12 15.5 19 24 28 34 38
15.7 17.7 22.4 26.4 33.4 39.4 45.6 52.6 63 71
13.73 15.73 19.67 23.67 29.67 35.61 41.61 47.61 55.54 63.54
14.0 16.0 20.0 24.0 30.0 36.0 42.0 48.0 56.0 64.0
5.8 6.8 8.6 10.4 13.1 15.3 16.3 17.5 19 22

 

 

 

 

 

 

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

 

 

 

 

Mechanical property

 

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.