Product Introduction
Flange Bolt Din 6921 Cl 8.8 conforms to DIN 6921 standard, available in materials like carbon steel, alloy steel, and stainless steel. It covers a wide range of sizes from M4 to M36 for various applications. Mechanically, it meets the 8.8 grade, ensuring high strength and good toughness. The bolt offers diverse surface treatments including plain, black oxide, and zinc plated to suit different environments and corrosion resistance needs.
Product Advantages
High-Strength Material Ensures Load-Bearing Capacity
Flange Bolt Din 6921 Cl 8.8 adopts carbon steel material and achieves the strength standard of Class 8.8 after heat treatment. It boasts a tensile strength of 800MPa and a yield strength of 640MPa. This high-strength characteristic enables it to withstand significant static and dynamic loads, making it suitable for high-strength connection scenarios such as heavy machinery and building structures. Compared with ordinary bolts, its load-bearing capacity is increased by approximately 30%, significantly reducing the risk of fracture due to excessive loads.
Integrated Flange Design Enhances Stability
Flange Bolt Din 6921 Cl 8.8 features an integrated flange design with a flange diameter larger than that of ordinary washers, providing more even pressure distribution and reducing stress concentration on the surface of connected parts. This design not only improves connection stability but also prevents bolt loosening. Under the same vibration conditions, its loosening probability is more than 50% lower than that of ordinary bolts.
Surface Treatment Enhances Anti-Corrosion Performance
Flange Bolt Din 6921 Cl 8.8 undergoes phosphating or galvanizing surface treatment to form a dense protective film, effectively isolating air and moisture to prevent rust. This anti-corrosion performance makes it suitable for humid, rainy, or coastal environments.
Precision Manufacturing Ensures Installation Efficiency
Flange Bolt Din 6921 Cl 8.8 is manufactured using precision cold heading technology, with thread tolerance controlled within ±0.05mm, ensuring perfect matching with nuts. This high-precision design not only reduces friction during installation but also avoids installation difficulties caused by dimensional deviations.
Outstanding High-Temperature and Fatigue Resistance
Flange Bolt Din 6921 Cl 8.8 undergoes special heat treatment, maintaining stable mechanical properties within a temperature range of -20°C to 150°C. Meanwhile, its fatigue resistance is excellent, withstanding over 100,000 cycles in cyclic load testing without failure, which is about 40% higher than the fatigue life of ordinary bolts. This characteristic makes it suitable for industrial environments with high temperatures or frequent vibrations.
Product Parameters
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:
Steel: 8.8, 10.9
Stainless: carbon steel
Plastic: -
Non Ferrous: -
Thread: 6g
FLANGE BOLT DIN 6921 CL 8.8 :dimensions in mm
|
Tdread |
M5 |
M6 |
M8 |
M10 |
M12 |
(M14) |
M16 |
M20 |
|
|
- |
- |
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 |
|
m´ |
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 |
Tab 2.
|
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Why Choose Us
High Quality
Our products are manufactured to the highest standards, utilizing premium materials and advanced manufacturing processes to ensure exceptional quality.
Rich Experience
With a commitment to strict quality control and attentive customer service, our experienced team is always ready to address your needs and guarantee complete customer satisfaction.
Quality Control
Our professional staff meticulously monitors the production process, conducts thorough product inspections, and ensures that every final product meets the required quality standards, guidelines, and specifications.
24-Hour Online Service
We strive to respond to all inquiries within 24 hours, and our dedicated teams are always available to assist you in case of any emergencies.
FAQs
Q: What is the recommended application scenario for Flange Bolt Din 6921 Cl 8.8?
A: Flange Bolt Din 6921 Cl 8.8 is ideally suited for applications requiring high strength and stability, such as heavy machinery, building structures, and industrial equipment. Its high tensile and yield strengths make it capable of withstanding significant loads, while the integrated flange design enhances connection stability and prevents bolt loosening.
Q: What materials are commonly used for the production of Flange Bolt Din 6921 Cl 8.8?
A: Flange Bolt Din 6921 Cl 8.8 is typically produced using high-quality carbon steel. This material, when combined with appropriate heat treatment, achieves the required strength standard of Class 8.8. Carbon steel is chosen for its strength, durability, and cost-effectiveness in various industrial applications.
Q: What surface treatment options are available for Flange Bolt Din 6921 Cl 8.8?
A: Flange Bolt Din 6921 Cl 8.8 can undergo various surface treatments to enhance its corrosion resistance and durability. Common options include phosphating and galvanizing. These treatments form a protective film on the bolt's surface, effectively isolating it from air and moisture, thereby preventing rust and prolonging its service life.
Q: What are the key dimensions to consider when selecting Flange Bolt Din 6921 Cl 8.8?
A: When selecting Flange Bolt Din 6921 Cl 8.8, key dimensions to consider include the nominal diameter of the thread, the length of the bolt, and the size of the flange. The nominal diameter determines the bolt's load-bearing capacity, while the length ensures proper engagement with the nut. The flange size is crucial for providing even pressure distribution and preventing bolt loosening.
Q: How does Flange Bolt Din 6921 Cl 8.8 perform in high-temperature environments?
A: Flange Bolt Din 6921 Cl 8.8 undergoes special heat treatment to maintain stable mechanical properties within a wide temperature range, including high temperatures. It can withstand temperatures up to 150°C without significant loss of strength or stability. This makes it suitable for applications in high-temperature environments, such as industrial furnaces and engines.
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