Home » DIN 7984 Low Head Socket Cap Screw A4 Stainless

DIN 7984 Low Head Socket Cap Screw A4 Stainless

FULLERKREG DIN 7984 A4 Stainless Steel Low Head Socket Cap Screws

FULLERKREG DIN 7984 A4 Stainless Steel Low Head Socket Cap Screws are premium corrosion-resistant fasteners manufactured from A4 (SUS316) austenitic stainless steel. The addition of molybdenum (Mo) in SUS316 provides significantly superior resistance to chlorides, acids, and marine environments compared to A2 (SUS304). Combined with the low-profile head design of DIN 7984, these screws are the ideal choice for demanding applications in harsh or corrosive environments where space is limited.

Product Specifications

  • Standard: DIN 7984
  • Material: A4 Stainless Steel (SUS316 / 316 SS)
  • Strength Grade: A4-70
  • Tensile Strength: Min. 700 MPa
  • Hardness: ≤95 HRB (210–240 HV)
  • Surface Treatment: Passivation
  • Thread Tolerance: 6g
  • Drive Type: Hexagon socket (Allen key)
  • Sizes Available: M3 – M20

Material — A4 Stainless Steel (SUS316) Chemical Composition (%)

FULLERKREG DIN 7984 A4 low head cap screws are manufactured from SUS316 austenitic stainless steel. The key differentiator from A2 is the addition of 2–3% molybdenum, which dramatically improves resistance to pitting corrosion in chloride-rich environments. All values are maximum unless a range is indicated.

Grade C (max) Si (max) Mn (max) P (max) S (max) Cr Ni Mo
SUS316 (A4) ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 16.00–18.00 10.00–14.00 2.00–3.00

Mechanical Properties — A4-70 (DIN 7984)

The following mechanical properties apply to FULLERKREG DIN 7984 A4-70 stainless steel low head socket cap screws per ISO 3506-1 requirements.

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 —
Corrosion Resistance Passivation treatment —

Key Features

  • Low profile head — reduced head height vs. DIN 912, ideal for space-constrained assemblies
  • A4 Stainless Steel (SUS316) — superior corrosion resistance vs. A2, especially in chloride and acidic environments
  • Molybdenum-enhanced alloy — 2–3% Mo content provides outstanding pitting and crevice corrosion resistance
  • Passivation surface treatment — enhanced oxide layer for maximum rust resistance
  • Non-magnetic — suitable for applications sensitive to magnetic interference
  • Marine & chemical grade — the preferred choice for saltwater, acid, and harsh chemical exposure
  • ISO/TS16949 quality management — salt spray test, hardness test, tensile test, and PPAP report available on request

Applications

FULLERKREG DIN 7984 A4 stainless steel low head cap screws are widely used in:

  • Marine and offshore structures (saltwater exposure)
  • Chemical processing and petrochemical plants
  • Desalination and water treatment equipment
  • Food and beverage processing machinery
  • Pharmaceutical and medical equipment
  • Coastal and outdoor architectural structures
  • Swimming pool and aquatic facility equipment
  • Thin-panel and confined-space assemblies in corrosive environments

Dimensional Specifications — DIN 7984 (Unit: mm)

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.
M3 0.5 5.68 5.32 1.65 1.35 2 0.7 3.00 2.86
M4 0.7 7.22 6.78 2.20 1.80 2.5 1.0 4.00 3.82
M5 0.8 8.72 8.28 2.75 2.25 3 1.1 5.00 4.82
M6 1.0 10.22 9.78 3.30 2.70 4 1.4 6.00 5.82
M8 1.25 13.27 12.73 4.40 3.60 5 2.0 8.00 7.78
M10 1.5 16.27 15.73 5.50 4.50 6 2.5 10.00 9.78
M12 1.75 18.27 17.73 6.60 5.40 8 3.0 12.00 11.73
M14 2.0 21.33 20.67 7.70 6.30 10 3.5 14.00 13.73
M16 2.0 24.33 23.67 8.80 7.20 10 4.0 16.00 15.73
M20 2.5 30.33 29.67 11.00 9.00 12 5.0 20.00 19.67

Packaging & Availability

  • Standard sizes M3 – M20 available in stock
  • Bulk carton packaging; custom packaging available
  • Custom lengths and special requirements accepted for large orders
  • PPAP report, material certificate, and test reports available on request

Download Specification

Quality Assurance

All FULLERKREG DIN 7984 A4 stainless steel fasteners are manufactured under strict quality control procedures including:

  • Salt spray corrosion test
  • Hardness test (≤95 HRB)
  • Tensile strength test (min. 700 MPa)
  • Dimensional inspection per DIN 7984
  • PPAP documentation available upon request

For wholesale pricing, bulk orders, or technical inquiries, please contact our sales team.

Filter products
Clear all

102 Products