FULLERKREG DIN 912 / ISO 4762 / GB70.1 A2 Stainless Steel Socket Cap Screws
FULLERKREG DIN 912 / ISO 4762 / GB70.1 A2 Stainless Steel Socket Cap Screws are corrosion-resistant, full-thread hexagon socket head cap screws manufactured from A2 (SUS304) austenitic stainless steel with a passivated natural finish. Combining the precision of DIN 912 / ISO 4762 dimensional standards with the excellent corrosion resistance of 18-8 stainless steel, these screws are the preferred choice for food processing, medical, marine, chemical, and outdoor applications where rust-free performance is essential.
Product Specifications
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Standards: DIN 912 / ISO 4762 / GB70.1
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Material: A2 Stainless Steel (SUS304 / 18-8)
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Strength Grade: A2-70
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Tensile Strength: Min. 700 MPa
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Proof Load Stress (Rp0.2): Min. 450 MPa
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Hardness: ≤95 HRB (max. 210 HV)
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Surface Treatment: Passivation — natural silver finish
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Thread Type: Full thread, standard metric
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Thread Tolerance: 6g
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Drive Type: Hexagon socket (Allen key / hex key)
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Product Class: A (precision)
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Sizes Available: M1.6 – M24
Material — A2 Stainless Steel (SUS304) Chemical Composition (%)
FULLERKREG DIN 912 A2 socket cap screws are manufactured from SUS304 austenitic stainless steel. All values are maximum unless a range is indicated.
| Grade |
C (max) |
Si (max) |
Mn (max) |
P (max) |
S (max) |
Cr |
Ni |
| SUS304 (A2) |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.045 |
≤0.030 |
18.00–20.00 |
8.00–10.50 |
Mechanical Properties — A2-70 (DIN 912 / ISO 4762)
The following mechanical properties apply per ISO 3506-1 requirements for A2-70 stainless steel fasteners.
| Property |
Requirement |
Unit |
| Tensile Strength (Rm) |
Min. 700 |
MPa |
| Proof Load Stress (Rp0.2) |
Min. 450 |
MPa |
| Hardness (max) |
≤95 HRB / ≤210 HV |
HRB / HV |
| Elongation after fracture (A) |
Min. 25 |
% |
| Thread Tolerance Class |
6g |
— |
| Surface Treatment |
Passivation (natural finish) |
— |
Key Features
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A2 Stainless Steel (SUS304) — excellent corrosion resistance in most atmospheric, freshwater, and mild chemical environments
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Passivated natural finish — enhanced oxide layer for maximum rust resistance; clean silver appearance
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Full thread design — maximum thread engagement for superior clamping force across all grip lengths
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Slight-magnetic — 300-series austenitic stainless steel may exhibit slight magnetism after cold working due to partial martensitic transformation.
Click to view: Why does stainless steel have weak magnetism?
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Hygienic & food-safe — compliant for food processing, pharmaceutical, and medical equipment use
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DIN 912 / ISO 4762 precision — Product Class A dimensional accuracy for tight-tolerance assemblies
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RoHS & REACH compliant — no restricted hazardous substances
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ISO/TS16949 quality management — hardness test, tensile test, and PPAP report available on request
Corrosion Resistance Guide
Understanding where A2 stainless steel performs best helps you select the right fastener:
| Environment |
A2 (SUS304) Performance |
Recommendation |
| Indoor / dry environments |
Excellent |
✅ Ideal |
| Outdoor / atmospheric exposure |
Very good |
✅ Suitable |
| Food processing / pharmaceutical |
Excellent |
✅ Ideal |
| Freshwater / mild humidity |
Very good |
✅ Suitable |
| Mild chemical exposure |
Good |
✅ Generally suitable |
| Saltwater / marine (direct) |
Limited |
⚠️ Consider A4 (SUS316) |
| Strong acids / chlorides |
Poor |
❌ Not recommended |
Applications
FULLERKREG DIN 912 A2 stainless steel socket cap screws are widely used in:
- Food processing and packaging machinery
- Pharmaceutical and medical device manufacturing
- Laboratory instruments and scientific equipment
- Electronics and electrical enclosures (non-magnetic requirement)
- Outdoor architectural structures and signage
- Chemical processing equipment (mild environments)
- Marine applications in sheltered or low-salinity environments
- General industrial machinery requiring corrosion-resistant fasteners
- Consumer products and appliances
Dimensional Specifications — DIN 912 / ISO 4762 (Unit: mm)
Full thread socket cap screws per DIN 912 / ISO 4762 / GB70.1 standard.
| Thread (d) |
Pitch (p) |
Head Dia. dk Max. |
Head Dia. dk Min. |
Head Height k Max. |
Head Height k Min. |
Key Size s |
Key Depth t Min. |
Body Dia. ds Max. |
Body Dia. ds Min. |
| M1.4 |
0.30 |
2.60 |
2.46 |
1.40 |
1.26 |
1.3 |
0.6 |
1.40 |
1.33 |
| M1.6 |
0.35 |
3.00 |
2.86 |
1.60 |
1.46 |
1.5 |
0.7 |
1.60 |
1.46 |
| M2 |
0.4 |
3.80 |
3.62 |
2.00 |
1.86 |
1.5 |
1.0 |
2.00 |
1.86 |
| M2.5 |
0.45 |
4.50 |
4.32 |
2.50 |
2.36 |
2.0 |
1.1 |
2.50 |
2.36 |
| M3 |
0.5 |
5.50 |
5.32 |
3.00 |
2.86 |
2.5 |
1.3 |
3.00 |
2.86 |
| M4 |
0.7 |
7.00 |
6.78 |
4.00 |
3.82 |
3.0 |
2.0 |
4.00 |
3.82 |
| M5 |
0.8 |
8.50 |
8.28 |
5.00 |
4.82 |
4.0 |
2.5 |
5.00 |
4.82 |
| M6 |
1.0 |
10.00 |
9.78 |
6.00 |
5.70 |
5.0 |
3.0 |
6.00 |
5.82 |
| M8 |
1.25 |
13.00 |
12.73 |
8.00 |
7.64 |
6.0 |
4.0 |
8.00 |
7.78 |
| M10 |
1.5 |
16.00 |
15.73 |
10.00 |
9.64 |
8.0 |
5.0 |
10.00 |
9.78 |
| M12 |
1.75 |
18.00 |
17.73 |
12.00 |
11.57 |
10.0 |
6.0 |
12.00 |
11.73 |
| M14 |
2.0 |
21.00 |
20.67 |
14.00 |
13.57 |
12.0 |
7.0 |
14.00 |
13.73 |
| M16 |
2.0 |
24.00 |
23.67 |
16.00 |
15.57 |
14.0 |
8.0 |
16.00 |
15.73 |
| M20 |
2.5 |
30.00 |
29.67 |
20.00 |
19.48 |
17.0 |
10.0 |
20.00 |
19.67 |
| M24 |
3.0 |
36.00 |
35.61 |
24.00 |
23.48 |
19.0 |
12.0 |
24.00 |
23.67 |
| M30 |
3.5 |
45.00 |
44.61 |
30.00 |
29.48 |
22.0 |
15.5 |
29.95 |
29.52 |
Frequently Asked Questions
Q: What is the difference between A2 and A4 stainless steel socket cap screws?
A2 (SUS304) contains 18% chromium and 8% nickel. A4 (SUS316) adds 2–3% molybdenum, which significantly improves resistance to chlorides and acids. For marine, saltwater, or aggressive chemical environments, A4 is recommended.
Q: Are these screws magnetic?
A2 stainless steel is generally non-magnetic in the annealed state. However, cold working during manufacturing may induce slight magnetism. For strictly non-magnetic applications, please confirm with our technical team.
Q: What torque values apply to A2-70 socket cap screws?
The minimum breaking torque values for A2-70 are as follows: M1.6 is 0.2 N·m, M2 is 0.4 N·m, M2.5 is 0.9 N·m, M3 is 1.6 N·m, M4 is 3.8 N·m, M5 is 7.8 N·m, M6 is 13 N·m, M8 is 32 N·m, M10 is 65 N·m, M12 is 110 N·m, and M16 is 290 N·m.
Q: Can I get material certificates and test reports?
A: Yes, we can provide a Certificate of Inspection. A sample document for DIN 912 / ISO 4762 A2 is available for download below.
Sample: Certificate of Inspection — DIN 912 / ISO 4762 A2
Q: What is the minimum order quantity?
We supply both small quantities and large bulk orders.
Most products: 1 carton (MOQ)
Micro sizes: 1 box (MOQ)
Volume Discounts: Price breaks apply — the more you order, the greater the discount.
Packaging & Availability
- Standard sizes M1.6 – M24 available in stock
- Bulk Carton Packaging : Fumigation-free pallet , 3 layers per pallet , 12 cartons per layer , Approx. 36 cartons per pallet
- Carton Specifications: Outer carton dimensions: 260 mm × 260 mm × 170 mm，Weight per carton: approx. 17–22 kg
- Material certificates and test reports available on request
- Custom lengths, branded outer cartons with logo printing, and custom inner boxes are all available for large orders.
Download Specifications
Quality Assurance
All FULLERKREG DIN 912 A2 stainless steel socket cap screws are manufactured under strict quality control procedures including:
- Hardness test (≤95 HRB)
- Tensile strength test (min. 700 MPa)
- Dimensional inspection per DIN 912 / ISO 4762
- Go/No-Go Gauge Inspection
- Chemical composition verification (SUS304)
- Salt spray corrosion test
- PPAP documentation available upon request
For wholesale pricing, bulk orders, material certificates, or technical inquiries, please contact our sales team.
