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DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts

  • DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts
  • DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts
  • DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts
  • DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts
  • DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts
Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number DIN571
Minimum Order Quantity 900kg
Price Negotiation
Packaging Details 25KG/CTN,36CTN/PALLET or small packing
Delivery Time 30DAYS
Payment Terms L/C, T/T
Supply Ability 500TON/MONTH

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Product Details
Standard DIN571 Material Carbon Steel
Size M4-M20 Finish ZP YZP HDG BLACK
Grade 4.8 6.8 8.8-12.8ect Packing Carton And Pallet Or According To The Customer's Requirement
Sample Free Sample Thread Mushroom Head Square Neck
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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DIN 571 Steel Nut Bolts

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CL6.8 Steel Nut Bolts

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DIN 571 Black Hex Head Wood Screws
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Product Description

 

Specification

 

DIN 571 - Hex wood screws

Current norm: DIN 571
Equivalent norms: CSN 021810; PN 82501; UNI 704

DIN 571 Hex Wood Screws Black CL6.8 Steel Nut Bolts 0

 

Legend:

b - length of the thread (at least)
l - length of bolt
k - head height
e - the diameter of the circumscribed circle (not less than)
s - size hex head turnkey

 

Makings:QBH

Steel: steel
Stainless: A2, A4
Plastic: -
Non Ferrous: -
Thread: as DIN 7998

Table according to DIN 571:

Thread 4 5 6 -7 8 10 12 16 20
ds nominal
size max.		 4 5 6 7 8 10 12 16 20
min. 3,52 4,52 5,52 6,42 7,42 9,42 11,3 15,3 19,3
da max. 5 6 7,2 8,2 10,2 12,2 15,2 19,2 24,4
k nominal
size		 2,8 3,5 4 5 5,5 7 8 10 13
max. 3,1 3,88 4,38 5,38 5,88 7,45 8,45 10,45 13,9
min. 2,5 3,13 3,63 4,63 5,13 6,55 7,55 9,55 12,1
s nominal
size		 7 8 10 12 13 17 19 24 30
max. 7 8 10 12 13 17 19 24 30
min. 6,64 7,64 9,64 11,57 12,57 16,57 18,48 23,16 29,16
e min. 7,5 8,63 10,89 13,07 14,2 18,72 20,88 26,17 32,95
l   weight kg/1000pcs
nominal
size		 min. max.
16 15,1 16,9 1,71 292              
20 18,95 21,05 2,01 3,42 5,02            
25 23,95 26,05 2,41 4,02 5,82   11,5        
30 28,95 31,05 2,81 4,62 6,62   12,9 23,6      
35 33,75 36,25 3,11 5,12 7,42   14,2 25,8 36,2    
40 38,75 41,25 3,51 5,82 8,22   15,6 28 39,2    
45 43,75 46,25     8,94   16,9 30 42,1    
50 48,75 51,25     9,64   18,2 32,1 45,4 84,1  
55 53,5 56,5     10,5   19,6 34,3 48,6 89,7  
60 58,5 61,5     11,2   20,9 36,5 51,8 94,9 165
65 63,5 66,5         22,2 38,5 54,7 99,5 174
70 68,5 71,5         23,6 40,7 57,8 107 182
75 73,5 76,5         25 42,9 61 112 192
80 78,5 81,5         26,5 45,2 64,5 118 201
90 88,25 91,75         29,4 49,9 71 130 220
100 98,25 101,75         32 54 77,1 141 238
110 108,25 111,75             83,4 152 253
120 118,25 121,75             89,5 163 275
130 128 132               175 293
140 138 142               187 317
150 148 152               198 328
160 158 162               209 348
170 168 172                 366
180 178 182                 385
190 187,7 192,3                 404
200 197,7 202,3                 421


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.

 

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