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DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric wholesale
  • China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric wholesale
  • China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric wholesale
  • China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric wholesale
  • China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric wholesale

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

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Brand Name :QBH
Model Number :DIN6921
Certification :ISO9001
Place of Origin :CHINA
MOQ :900kg
Price :Negotiation
Payment Terms :L/C, T/T
Supply Ability :500TON/MONTH
Delivery Time :30DAYS
Packaging Details :25KG/CTN,36CTN/PALLET or small packing
Standard :DIN6921
Material :Carbon Steel
Size :M5-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 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

Specification

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors,

and automotive suspension systems. They are at least 25% stronger than medium-strength steel

screws. The flange distributes pressure where the screw meets the surface, eliminating the need for a

separate washer. Head height includes the flange. Length is measured from under the flange.

Black-phosphate steel screws are mildly corrosion resistant in dry environments. Zinc yellow-

chromate plated steel screws resist corrosion in wet environments.

Screws that meet ISO 898-1 or SAE J1199 comply with specifications and testing requirements for

material quality. Screws that meet ASME B18.2.3.9M or DIN 6921 comply with specifications for

dimensional standards.

DIN 6921 - Hexagon flange bolts metric

Current norm: DIN EN 1665

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

Legend:

d2 - the inner diameter of the ring
b - length of the thread (at least)
l - length of bolt
d - the nominal diameter of the thread
k - head height
s - size hex head turnkey

Makings:QBH

Steel: 4.6,8.8,10.9
Stainless: A2, A4
Plastic: -
Non Ferrous: -
Thread: 6g

Table according to DIN 6921:

Tdread M5 M6 M8 M10 M12 (M14) M16 M20
size d - - M8 x 1 M10 x 1,25 M12 x 1,5 (M14x1,5) M16 x 1,5 M20 x 1,5
- - - (M10 x 1) (M10 x 1,25) - - -
P 0,8 1 1,25 1,5 1,75 2 2 2,5
C Min. 1 1,1 1,2 1,5 1,8 2,1 2,4 3
da Min. 5 6 8 10 12 14 16 20
Max. 5,75 6,75 8,75 10,8 13 15,1 17,3 21,6
dc Max. 11,8 14,2 17,9 21,8 26 29,9 34,5 42,8
dw Min. 9,8 12,2 15,8 19,6 23,8 27,6 31,9 39,9
e Min. 8,79 11,05 14,38 16,64 20,03 23,36 26,75 32,95
h Max. 6,2 7,3 9,4 11,4 13,8 15,9 18,3 22,4
m Min. 4,7 5,7 7,6 9,6 11,6 13,3 15,3 18,9
Min. 2,2 3,1 4,5 5,5 6,7 7,8 9 11,1
s Nominal size
=max.
8 10 13 15 18 21 24 30
Min. 7,78 9,78 12,73 14,73 17,73 20,67 23,67 29,16
r Max. 0,3 0,36 0,48 0,6 0,72 0,88 0,96 1,2

Tab2

Thread d M5 M6 M8 M10 M12 M14 M16 M 20
- - M8 x 1 M10 x 1,25 M12 x 1,5 M14 x 1,5 M16 x 1,5 M20 x 1,5
- - - (M10 x 1) (M12 x 1,25) - - -
l Shank lengtds
nominal
dimension
min. max. ls min. lg max ls min. lg max ls min. lg max ls min. lg max ls min. lg max ls min. lg max ls min. lg max ls min. lg max
10 9,71 10,29 - 2,4
12 11,65 12,35 - 2,4 - 3
16 15,65 16,35 - 2,4 - 3 - 4
20 19,58 20,42 - 4 - 3 - 4 - 4,5
25 24,58 25,42 5 9 2 7 - 4 - 4,5 - 5,3
30 29,58 30,42 10 14 7 12 - 8 - 4,5 - 5,3 - 6
35 34,5 35,5 15 19 12 17 6,75 13 - 9 - 5,3 - 6 - 6
40 39,5 40,5 20 24 17 22 11,75 18 6,5 14 - 10 - 6 - 6 - 7,5
45 44,5 45,5 25 29 22 27 16,75 23 11,5 19 6,25 15 - 11 - 6 - 7,5
50 49,5 50,5 30 34 27 32 21,75 28 16,5 24 11,25 20 6 16 - 12 - 7,5
55 54,4 55,6 32 37 26,75 33 21,5 29 16,25 25 11 21 7 17 - 9
60 59,4 60,6 37 42 31,75 38 26,5 34 21,25 30 16 26 12 22 - 14
65 64,4 65,5 36,75 43 31,5 39 26,25 35 21 31 17 27 6,5 19
70 69,4 70,6 41,75 48 36,5 44 31,25 40 26 36 22 32 11,5 24
80 79,4 80,6 51,75 58 46,5 54 41,25 50 36 46 32 42 21,5 34
90 89,3 90,7 56,5 64 51,25 60 46 56 42 52 31,5 44
100 99,3 100,7 66,5 74 61,25 70 56 66 52 62 41,5 54
110 109,3 110,7 71,25 80 66 76 62 72 51,5 54
120 119,3 120,7 81,25 90 76 86 72 82 61,5 74
130 129,2 130,8 80 90 76 86 65,5 78
140 139,2 140,8 90 100 86 96 75,5 88
150 149,2 150,8 96 106 85,5 98
160 159,2 160,8 106 116 95,5 108
180 179,2 180,8 115,5 128
200 199 201 135,5 148

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.

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

China DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric for sale

DIN 6921 Serrate CL8.8 Stainless Steel Flange Bolts Metric

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