ZP YZP HDG BLACK DIN931 Hex CL8.8 M72 Half Thread Screw

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number M4-M72
Minimum Order Quantity 500KG
Price 900USD-1200USD/TON
Packaging Details 25kg Carton+900kg/Pallet or 5KG/CTN
Delivery Time 30days
Payment Terms L/C, T/T,OA
Supply Ability 600TON/MONTH
Product Details
Material 1008 1035 1045 40CR 42CRMO 35CRMO SIZE M4-M72
LENGTH ALL KIND OF LENGTH SURFACE ZP YZP HDG BLACK
Mechanical Capacity ISO898-1 PACKING ACCORDING CUSTOMER REQUIREMENT
DELIVERY TIME VERY SOON
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DIN931 Half Thread Screw

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8.8 Half Thread Screw

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ISO 898 Hex Bolt Half Thread

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Product Description

Specification

 

DIN 931 - Hexagon head bolts with shank

Current norm: DIN EN ISO 4014
Equivalent norms: ISO 4014; CSN 021101; PN 82101; UNI 5737; EU 24014

 

ZP YZP HDG BLACK DIN931 Hex CL8.8 M72 Half Thread Screw 0

Legend:

l - length of bolt

Makings:QBH

Steel: 5.6,5.8,8.8,10.9,12.9
Stainless: A2,A4
Plastic: -
Non Ferrous: Brass
Thread: 6g

 

 


DIN 931

Sizes and characteristics of hexagon head bolts partially threaded DIN 931
D M3 M4 M5 M6 M8 M10 M12 M14 M16 M18
P 0,5 0,7 0,8 1 1,25 1,5 1,75 2 2 2,5
K 2 2,8 3,5 4 5,3 6,4 7,5 8,8 10 11,5
C min. 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,15 0,2 0,2
max. 0,4 0,4 0,5 0,5 0,6 0,6 0,6 0,6 0,8 0,8
R 0,1 0,2 0,2 0,25 0,4 0,4 0,6 0,6 0,6 0,6
S DIN 931 5,5 7 8 10 13 17 19 22 24 27
ISO 4014 16 18 21
e DIN 931 6,01 7,66 8,79 11,05 14,38 18,9 21,1 24,49 26,75 30,14
ISO 4014 17,77 20,03 23,36
B (L≤125) 12 14 16 18 22 26 30 34 38 42
B (125<L≤200) 18 20 22 24 28 32 36 40 44 48
B (L>200) - - - - - 45 49 53 57 61


 

D M20 M22 M24 M27 M30 M36 M42 M48 M56 M64
P 2,5 2,5 3 3 3,5 4 4,5 5 5,5 6
K 12.5 14 15 17 18.7 22.5 26 30 35 40
C min. 0,2 0,2 0,2 0,2 0,2 0,2 0,3 0,3 0,3 0,3
max. 0,8 0,8 0,8 0,8 0,8 0,8 1 1 1 1
R 0,8 0,8 0,8 1 1 1 1,2 1,6 2 2
S DIN 931 30 32 36 41 46 55 65 75 85 95
ISO 4014 34
e DIN 931 33,53 38,85 39,98 45,2 50,85 60,79 71,3 82,6 93,56 104,9
ISO 4014 37,72
B (L≤125) 46 50 54 60 66 - - - - -
B (125<L≤200) 52 56 60 66 72 84 96 108 - -
B (L>200) 65 69 73 79 85 97 109 121 137 153

 

 

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

 

 

 

 

Mechanical capacity

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.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

 

 

Product Grade

 

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

 

 

 

 

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

Hexagon Bolts are created to DIN 931, and are a partially threaded fastener with a hexagon-shaped head that is usually fixed with a spanner or socket tool.

Hosting a machine thread, these bolts are suitable for use with either a nut or within a pre-tapped hole.

Materials can include various grades of steel, including Grade 5 (5.6), Grade 8 (8.8), Grade 10 (10.9) and Grade 12 (12.9) with zinc plating, zinc and yellow, galvanising or self colour. They are also available in A2 and A4 stainless steel, with other materials available to order.

As standard, they are available in sizes from M3 to M64, with non-standard sizes and threads – such as UNC, UNF, BSW and BSF – all possible to order.

Please contact us with your requirements to further your enquiry.