The A2-70 bolt is a corrosion-resistant fastener made from austenitic stainless steel, most commonly grades 304 or 304L. The designation "A2" refers to the material's composition, which is known for its excellent resistance to corrosion, particularly in acidic environments, as well as its non-magnetic properties. The number "70" in the bolt's grade indicates a minimum tensile strength of 700 N/mm² (or 700 MPa), ensuring that the bolt can withstand high mechanical stresses without failing. This makes A2-70 bolts suitable for demanding applications where both strength and resistance to environmental factors are essential.
A2-70 bolts are widely used in marine, chemical, and other harsh environments where exposure to moisture, chemicals, or high temperatures is common. Thanks to their combination of high tensile strength and superior corrosion resistance, A2-70 bolts provide long-lasting performance in challenging conditions. Their reliability, especially in environments prone to rust and degradation, makes them a go-to choice for industries such as construction, manufacturing, and automotive, where durability is critical.
Product Data
d
M6
M8
M10
M12
M16
M20
M24
M30
M36
M42
M48
Pitch P
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
ds
max
6.48
8.58
10.58
12.7
16.7
20.84
24.84
30.84
37
43
49
min
5.52
7.42
9.42
11.3
15.3
19.16
23.16
29.16
35
41
47
b
L≤120
18
22
26
30
38
46
54
66
78
/
/
120≤L≤200
/
/
/
/
44
52
60
72
84
96
108
K=k1
max
4.9
5.9
7.5
8.75
11.4
13.9
15.9
20
24
27
31
min
4.1
5.1
6.5
7.25
9.6
12.1
14.1
18
22
25
29
s
max
6.6
8.75
10.75
12.9
16.9
21
25
31
37.25
43.25
46.75
min
5.4
7.25
9.25
11.1
15.1
19
23
29
34.75
40.75
46.75
s1
max
16.9
18.9
22
27
31
37.25
44.25
55.5
67.5
81.5
89.75
min
15.1
17.1
20
25
29
34.75
41.75
52.5
64.5
78.5
86.25
Applications
Building Insulation: Primarily used in the installation of thermal insulation systems in residential, commercial, and industrial buildings.
External Wall Insulation: Often used in External Thermal Insulation Composite Systems (ETICS) to fix insulation boards to external walls.
Roof Insulation: Suitable for securing insulation materials on roofs to enhance energy efficiency and thermal performance.
Floor Insulation: Utilized in floor insulation systems to prevent heat loss through the flooring and improve overall energy efficiency.
Comparison with Other Models
Compared with common carbon steel bolts, the A2 - 70 stainless steel T-bolt has an overwhelming advantage in corrosion resistance. Common carbon steel bolts are prone to rust and corrosion in wet or chemically aggressive environments, leading to loosening of connections and seriously affecting the stability and safety of structures. In contrast, the A2 - 70 bolt can still maintain good physical properties even after long-term exposure to harsh environments. For example, in a marine environment, common carbon steel bolts may show obvious rust within a few months, while the A2 - 70 stainless steel T-bolt can still firmly fix the relevant components after years of seawater erosion and salt spray environment tests, ensuring the integrity of equipment or building structures.
In terms of strength, although some high-strength alloy steel bolts may have higher tensile strength, the A2 - 70 stainless steel T-bolt achieves an excellent balance between strength and corrosion resistance. For some application scenarios that require a certain degree of mechanical strength and are also at risk of corrosion, such as the external connection parts of chemical equipment, the A2 - 70 bolt is a more suitable choice. Because in a chemical environment, there are not only mechanical stresses but also the corrosion of various chemical substances, and the A2 - 70 bolt can handle both challenges simultaneously, while a simple high-strength alloy steel bolt may fail prematurely due to insufficient corrosion resistance.
Productiong Process
The production process of the A2 - 70 stainless steel T-bolt follows strict standards and a refined technological process. First, high-quality austenitic stainless steel raw materials are selected, and advanced melting technology is used to ensure the uniform and stable chemical composition of the materials, with the impurity content controlled at an extremely low level. During the forging process, the temperature and pressure are precisely controlled to gradually shape the raw materials into the preliminary shape of the T-bolt. Subsequently, precision machining is carried out, and equipment such as CNC lathes is used to precisely process the threads, heads and other parts of the bolt to ensure that the dimensional accuracy meets the strict standard requirements. For example, the parameters such as the pitch and thread angle of the thread are strictly controlled to ensure a perfect fit with the matching nut and the tightness and reliability of the connection.
In terms of surface treatment, although the A2 - 70 stainless steel itself has good corrosion resistance, in order to further improve its performance, passivation treatment is usually carried out. During the passivation treatment process, a dense oxide film is formed on the surface of the bolt by chemical methods. This oxide film can effectively block the erosion of external corrosive media and enhance the corrosion resistance and durability of the bolt. Throughout the production process, a strict quality control system runs through, and each process is strictly inspected to ensure that each A2 - 70 stainless steel T-bolt produced meets high-quality standards.
Quality Inspection Process
The quality inspection of the A2 - 70 stainless steel T-bolt is a key link to ensure its reliable performance. First, when the raw materials enter the factory, advanced equipment such as a spectrum analyzer is used to accurately detect the chemical composition of the raw materials to ensure that it meets the standard composition requirements of 304 or 304L stainless steel, and the content of key elements such as chromium, nickel and molybdenum is strictly controlled.
During the production process, samples are taken from each batch of bolts for mechanical property testing. A universal material testing machine is used for the tensile test to detect whether the tensile strength of the bolt reaches above 700 N/mm², and at the same time, observe whether the yield strength, elongation and other indicators meet the standards. For example, if the tensile strength of the bolt is lower than the standard value, it may not be able to withstand the designed mechanical load in actual use, resulting in connection failure.
For the detection of thread accuracy, professional tools such as thread gauges are used to check whether the parameters such as the pitch, pitch diameter and thread angle of the thread are within the standard tolerance range. If the thread accuracy is unqualified, it will affect the fit between the bolt and the nut, resulting in loose connection or inability to tighten.
Appearance inspection is also an important part. The surface of the bolt is inspected by the naked eye and a magnifying glass to check for cracks, scratches, sand holes and other defects to ensure that the surface quality of the bolt is intact. Only after passing a strict quality inspection process and meeting all the indicators can the A2 - 70 stainless steel T-bolt enter the market and provide users with a reliable connection solution.
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