Product Introduction
Hex Bolt Din 931 Half Thread is a hexagon bolt conforming to German DIN 931 standard. Made of high-quality alloy steel, it has high strength, hardness and good toughness. "Half Thread" means its threaded part is half-threaded, with one side threaded and the other side not. This design makes it flexible during installation, allowing the threaded side to face up or down as needed. The bolt is widely used in automotive, aerospace, machinery manufacturing and other fields, being a common fastener in various industrial equipment and structures.
Product Features
High Strength and Reliability
Hex Bolt Din 931 Half Thread is crafted from medium-carbon steel and achieves a strength grade of 8.8 after heat treatment, with a tensile strength of 800 MPa and a yield strength of 640 MPa. This high strength enables it to withstand significant static and dynamic loads, making it suitable for high-stress applications such as heavy machinery and building structures. Compared to ordinary 4.6-grade bolts, its tensile strength is nearly doubled, significantly enhancing the reliability and safety of connections.
Advantages of Half-Thread Design
Hex Bolt Din 931 Half Thread features a half-thread design, where part of the bolt is threaded and part is smooth. This design allows the smooth portion to better withstand shear forces during connection, while the threaded portion provides stable preload. For instance, in steel structure connections, the shear resistance of the smooth portion is about 15%-20% higher than that of fully threaded bolts, making it particularly suitable for applications requiring lateral load bearing.
Surface Treatment and Corrosion Resistance
Hex Bolt Din 931 Half Thread is typically treated with zinc plating or Dacromet, with a zinc coating thickness of 5-15 microns and a salt spray test duration of over 500 hours. This surface treatment provides excellent corrosion resistance in damp, corrosive environments (such as coastal areas or chemical plants). Compared to ordinary carbon steel bolts, its service life is extended by 3-5 times, significantly reducing maintenance and replacement costs.
Precise Dimensions and Tolerance Control
Hex Bolt Din 931 Half Thread strictly follows the DIN 931 standard, with dimensional tolerances controlled within ±0.1 mm, ensuring precise mating with nuts and connecting pieces. This high-precision design reduces friction and wear during installation, improves assembly efficiency, and avoids loosening or fracture issues caused by dimensional deviations.
Wide Operating Temperature Range
Hex Bolt Din 931 Half Thread operates stably within a temperature range of -50°C to +150°C. The thermal expansion coefficient of its material matches that of most steel structures, preventing preload loss due to temperature changes. In high-temperature environments, its strength loss rate is below 5%, far superior to the 10%-15% of ordinary bolts, ensuring long-term reliability.
Product Parameters
|
Products name |
HEX BOLT DIN 931/ISO4014 half thread |
|
Standard |
DIN,ASTM/ANSI JIS EN ISO,AS,GB |
|
Grade |
Steel Grade: DIN: Gr.4.6,4.8,5.6,5.8,8.8,10.9,12.9; SAE: Gr.2,5,8; |
|
Finishing |
Zinc(Yellow,White,Blue,Black),Hop Dip Galvanized(HDG),Black Oxide, |
|
Production Process |
M2-M24:Cold Froging,M24-M100 Hot Forging, |
|
Customized Products Lead time |
30-60days, |
|
Screw Thread |
M1.6 |
M2 |
M2.5 |
M3 |
(M3.5) |
M4 |
M5 |
M6 |
(M7) |
M8 |
M10 |
M12 |
||
|
P |
Pitch |
0.35 |
0.4 |
0.45 |
0.5 |
0.6 |
0.7 |
0.8 |
1 |
1 |
1.25 |
1.5 |
1.75 |
|
|
b |
L≤125 |
9 |
10 |
11 |
12 |
13 |
14 |
16 |
18 |
20 |
22 |
26 |
30 |
|
|
125＜L≤200 |
15 |
16 |
17 |
18 |
19 |
20 |
22 |
24 |
26 |
28 |
32 |
36 |
||
|
L＞200 |
28 |
29 |
30 |
31 |
32 |
33 |
35 |
37 |
39 |
41 |
45 |
49 |
||
|
c |
max |
0.25 |
0.25 |
0.25 |
0.4 |
0.4 |
0.4 |
0.5 |
0.5 |
0.6 |
0.6 |
0.6 |
0.6 |
|
|
min |
0.1 |
0.1 |
0.1 |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
0.15 |
||
|
da |
max |
2 |
2.6 |
3.1 |
3.6 |
4.1 |
4.7 |
5.7 |
6.8 |
7.8 |
9.2 |
11.2 |
13.7 |
|
|
ds |
max=nominal size |
1.6 |
2 |
2.5 |
3 |
3.5 |
4 |
5 |
6 |
7 |
8 |
10 |
12 |
|
|
Grade A |
min |
1.46 |
1.86 |
2.36 |
2.86 |
3.32 |
3.82 |
4.82 |
5.82 |
6.78 |
7.78 |
9.78 |
11.73 |
|
|
Grade B |
min |
1.35 |
1.75 |
2.25 |
2.75 |
3.2 |
3.7 |
4.7 |
5.7 |
6.64 |
7.64 |
9.64 |
11.57 |
|
|
dw |
Grade A |
min |
2.54 |
3.34 |
4.34 |
4.84 |
5.34 |
6.2 |
7.2 |
8.88 |
9.63 |
11.63 |
14.63 |
16.63 |
|
Grade B |
min |
2.42 |
3.22 |
4.22 |
4.72 |
5.22 |
6.06 |
7.06 |
8.74 |
9.47 |
11.47 |
14.47 |
16.47 |
|
|
e |
Grade A |
min |
3.41 |
4.32 |
5.45 |
6.01 |
6.58 |
7.66 |
8.79 |
11.05 |
12.12 |
14.38 |
17.77 |
20.03 |
|
Grade B |
min |
3.28 |
4.18 |
5.31 |
5.88 |
6.44 |
7.5 |
8.63 |
10.89 |
11.94 |
14.2 |
17.59 |
19.85 |
|
|
L1 |
max |
0.6 |
0.8 |
1 |
1 |
1 |
1.2 |
1.2 |
1.4 |
1.4 |
2 |
2 |
3 |
|
|
k |
Nominal Size |
1.1 |
1.4 |
1.7 |
2 |
2.4 |
2.8 |
3.5 |
4 |
4.8 |
5.3 |
6.4 |
7.5 |
|
|
Grade A |
max |
1.225 |
1.525 |
1.825 |
2.125 |
2.525 |
2.925 |
3.65 |
4.15 |
4.95 |
5.45 |
6.58 |
7.68 |
|
|
min |
0.975 |
1.275 |
1.575 |
1.875 |
2.275 |
2.675 |
3.35 |
3.85 |
4.65 |
5.15 |
6.22 |
7.32 |
||
|
Grade B |
max |
1.3 |
1.6 |
1.9 |
2.2 |
2.6 |
3 |
3.74 |
4.24 |
5.04 |
5.54 |
6.69 |
7.79 |
|
|
min |
0.9 |
1.2 |
1.5 |
1.8 |
2.2 |
2.6 |
3.26 |
3.76 |
4.56 |
5.06 |
6.11 |
7.21 |
||
|
k1 |
Grade A |
min |
0.68 |
0.89 |
1.1 |
1.31 |
1.59 |
1.87 |
2.35 |
2.7 |
3.26 |
3.61 |
4.35 |
5.12 |
|
Grade B |
min |
0.63 |
0.84 |
1.05 |
1.26 |
1.54 |
1.82 |
2.28 |
2.63 |
3.19 |
3.54 |
4.28 |
5.05 |
|
|
r |
min |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.2 |
0.2 |
0.25 |
0.25 |
0.4 |
0.4 |
0.6 |
|
|
s |
max=nominal size |
3.2 |
4 |
5 |
5.5 |
6 |
7 |
8 |
10 |
11 |
13 |
16 |
18 |
|
|
Grade A |
min |
3.02 |
3.82 |
4.82 |
5.32 |
5.82 |
6.78 |
7.78 |
9.78 |
10.73 |
12.73 |
15.73 |
17.73 |
|
|
Grade B |
min |
2.9 |
3.7 |
4.7 |
5.2 |
5.7 |
6.64 |
7.64 |
9.64 |
10.57 |
12.57 |
15.57 |
17.57 |
|
|
Length of Thread b |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
||
|
Screw Thread |
(M14) |
M16 |
(M18) |
M20 |
(M22) |
M24 |
(M27) |
M30 |
(M33) |
M36 |
(M39) |
M42 |
||
|
P |
Pitch |
2 |
2 |
2.5 |
2.5 |
2.5 |
3 |
3 |
3.5 |
3.5 |
4 |
4 |
4.5 |
|
|
b |
L≤125 |
34 |
38 |
42 |
46 |
50 |
54 |
60 |
66 |
72 |
- |
- |
- |
|
|
125＜L≤200 |
40 |
44 |
48 |
52 |
56 |
60 |
66 |
72 |
78 |
84 |
90 |
96 |
||
|
L＞200 |
53 |
57 |
61 |
65 |
69 |
73 |
79 |
85 |
91 |
97 |
103 |
109 |
||
|
c |
max |
0.6 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
0.8 |
1 |
1 |
|
|
min |
0.15 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
0.3 |
0.3 |
||
|
da |
max |
15.7 |
17.7 |
20.2 |
22.4 |
24.4 |
26.4 |
30.4 |
33.4 |
36.4 |
39.4 |
42.4 |
45.6 |
|
|
ds |
max=nominal size |
14 |
16 |
18 |
20 |
22 |
24 |
27 |
30 |
33 |
36 |
39 |
42 |
|
|
Grade A |
min |
13.73 |
15.73 |
17.73 |
19.67 |
21.67 |
23.67 |
- |
- |
- |
- |
- |
- |
|
|
Grade B |
min |
13.57 |
15.57 |
17.57 |
19.48 |
21.48 |
23.48 |
26.48 |
29.48 |
32.38 |
35.38 |
38.38 |
41.38 |
|
|
dw |
Grade A |
min |
19.64 |
22.49 |
25.34 |
28.19 |
31.71 |
33.61 |
- |
- |
- |
- |
- |
- |
|
Grade B |
min |
19.15 |
22 |
24.85 |
27.7 |
31.35 |
33.25 |
38 |
42.75 |
46.55 |
51.11 |
55.86 |
59.95 |
|
|
e |
Grade A |
min |
23.36 |
26.75 |
30.14 |
33.53 |
37.72 |
39.98 |
- |
- |
- |
- |
- |
- |
|
Grade B |
min |
22.78 |
26.17 |
29.56 |
32.95 |
37.29 |
39.55 |
45.2 |
50.85 |
55.37 |
60.79 |
66.44 |
71.3 |
|
|
L1 |
max |
3 |
3 |
3 |
4 |
4 |
4 |
6 |
6 |
6 |
6 |
6 |
8 |
|
|
k |
Nominal Size |
8.8 |
10 |
11.5 |
12.5 |
14 |
15 |
17 |
18.7 |
21 |
22.5 |
25 |
26 |
|
|
Grade A |
max |
8.98 |
10.18 |
11.715 |
12.715 |
14.215 |
15.215 |
- |
- |
- |
- |
- |
- |
|
|
min |
8.62 |
9.82 |
11.285 |
12.285 |
13.785 |
14.785 |
- |
- |
- |
- |
- |
- |
||
|
Grade B |
max |
9.09 |
10.29 |
11.85 |
12.85 |
14.35 |
15.35 |
17.35 |
19.12 |
21.42 |
22.92 |
25.42 |
26.42 |
|
|
min |
8.51 |
9.71 |
11.15 |
12.15 |
13.65 |
14.65 |
16.65 |
18.28 |
20.58 |
22.08 |
24.58 |
25.58 |
||
|
k1 |
Grade A |
min |
6.03 |
6.87 |
7.9 |
8.6 |
9.65 |
10.35 |
- |
- |
- |
- |
- |
- |
|
Grade B |
min |
5.96 |
6.8 |
7.81 |
8.51 |
9.56 |
10.26 |
11.66 |
12.8 |
14.41 |
15.46 |
17.21 |
17.91 |
|
|
r |
min |
0.6 |
0.6 |
0.6 |
0.8 |
0.8 |
0.8 |
1 |
1 |
1 |
1 |
1 |
1.2 |
|
|
s |
max=nominal size |
21 |
24 |
27 |
30 |
34 |
36 |
41 |
46 |
50 |
55 |
60 |
65 |
|
|
Grade A |
min |
20.67 |
23.67 |
26.67 |
29.67 |
33.38 |
35.38 |
- |
- |
- |
- |
- |
- |
|
|
Grade B |
min |
20.16 |
23.16 |
26.16 |
29.16 |
33 |
35 |
40 |
45 |
49 |
53.8 |
58.8 |
63.1 |
|
|
Length of Thread b |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
|
||
|
Screw Thread |
(M45) |
M48 |
(M52) |
M56 |
(M60) |
M64 |
|
|
|
|
|
|
||
|
P |
Pitch |
4.5 |
5 |
5 |
5.5 |
5.5 |
6 |
|
|
|
|
|
|
|
|
b |
L≤125 |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
|
125＜L≤200 |
102 |
108 |
116 |
- |
- |
- |
|
|
|
|
|
|
||
|
L＞200 |
115 |
121 |
129 |
137 |
145 |
153 |
|
|
|
|
|
|
||
|
c |
max |
1 |
1 |
1 |
1 |
1 |
1 |
|
|
|
|
|
|
|
|
min |
0.3 |
0.3 |
0.3 |
0.3 |
0.3 |
0.3 |
|
|
|
|
|
|
||
|
da |
max |
48.6 |
52.6 |
56.6 |
63 |
67 |
71 |
|
|
|
|
|
|
|
|
ds |
max=nominal size |
45 |
48 |
52 |
56 |
60 |
64 |
|
|
|
|
|
|
|
|
Grade A |
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
|
Grade B |
min |
44.38 |
47.38 |
51.26 |
55.26 |
59.26 |
63.26 |
|
|
|
|
|
|
|
|
dw |
Grade A |
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
Grade B |
min |
64.7 |
69.45 |
74.2 |
78.66 |
83.41 |
88.16 |
|
|
|
|
|
|
|
|
e |
Grade A |
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
Grade B |
min |
76.95 |
82.6 |
88.25 |
93.56 |
99.21 |
104.86 |
|
|
|
|
|
|
|
|
L1 |
max |
8 |
10 |
10 |
12 |
12 |
13 |
|
|
|
|
|
|
|
|
k |
Nominal Size |
28 |
30 |
33 |
35 |
38 |
40 |
|
|
|
|
|
|
|
|
Grade A |
max |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
|
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
||
|
Grade B |
max |
28.42 |
30.42 |
33.5 |
35.5 |
38.5 |
40.5 |
|
|
|
|
|
|
|
|
min |
27.58 |
29.58 |
32.5 |
34.5 |
37.5 |
39.5 |
|
|
|
|
|
|
||
|
k1 |
Grade A |
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
Grade B |
min |
19.31 |
20.71 |
22.75 |
24.15 |
26.25 |
27.65 |
|
|
|
|
|
|
|
|
r |
min |
1.2 |
1.6 |
1.6 |
2 |
2 |
2 |
|
|
|
|
|
|
|
|
s |
max=nominal size |
70 |
75 |
80 |
85 |
90 |
95 |
|
|
|
|
|
|
|
|
Grade A |
min |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
|
|
Grade B |
min |
68.1 |
73.1 |
78.1 |
82.8 |
87.8 |
92.8 |
|
|
|
|
|
|
|
|
Length of Thread b |
- |
- |
- |
- |
- |
- |
|
|
|
|
|
|
||
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 meaning of "Half Thread" in Hex Bolt Din 931 Half Thread?
A: "Half Thread" means that only half of the bolt's shank is threaded. This leaves one end with a threaded section for engaging with a tapped hole and the other end without threads, which can be used for specific installation needs or to prevent the bolt from being fully inserted into a threaded hole.
Q: Are there different head styles available for Hex Bolt Din 931 Half Thread?
A: Yes, while the hexagonal head is common, there may also be variations such as socket head, pan head, or truss head depending on the manufacturer and intended application. The choice of head style can affect the bolt's performance and installation requirements.
Q: Does Hex Bolt Din 931 Half Thread come in various lengths?
A: Yes, it is available in a range of lengths to suit different applications. The length you choose will depend on the thickness of the materials being joined and any specific design requirements.
Q: Can Hex Bolt Din 931 Half Thread be used in corrosive environments?
A: It depends on the material and coating of the bolt. Some Hex Bolt Din 931 Half Threads are made from stainless steel or coated with anti-corrosion materials to enhance their resistance to corrosion in such environments.
Q: What is the typical tolerance for Hex Bolt Din 931 Half Thread?
A: The tolerance for Hex Bolt Din 931 Half Thread is defined by the DIN 931 standard. It specifies the allowable deviations for dimensions such as diameter, pitch, and thread tolerance to ensure consistent and reliable performance.
Q: Is Hex Bolt Din 931 Half Thread suitable for high-strength applications?
A: Yes, it is designed to provide high strength and reliability. The specific grade (e.g., 8.8, 10.9) indicates its mechanical properties, with higher grades offering greater tensile and yield strength for demanding applications.
Q: Can Hex Bolt Din 931 Half Thread be easily removed after installation?
A: Yes, it can be removed using standard tools such as wrenches or sockets. However, if thread-locking adhesives were used during installation, additional steps may be needed to break the bond before removal.
Q: Does Hex Bolt Din 931 Half Thread have good fatigue resistance?
A: The fatigue resistance of Hex Bolt Din 931 Half Thread depends on factors such as the material, heat treatment process, and operating conditions. Higher-grade bolts generally offer better fatigue resistance for cyclic loading applications.
Q: Are there any special considerations when tightening Hex Bolt Din 931 Half Thread?
A: When tightening, it is important to follow the recommended torque values to ensure proper clamping force and avoid over-tightening, which can damage the bolt or the threads in the mating part. Use of a torque wrench is advised for accuracy.
Q: Can Hex Bolt Din 931 Half Thread be customized for specific applications?
A: While the basic design follows the DIN 931 standard, some manufacturers may offer customization options such as special coatings, non-standard lengths, or specific head styles to meet unique application requirements. This can be particularly useful for specialized industrial applications.
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