Home » ISO 7380 Button Head Socket Cap Screw A2 Stainless

ISO 7380 Button Head Socket Cap Screw A2 Stainless

FULLERKREG ISO 7380-1 A2 Stainless Steel Button Head Socket Cap Screws

FULLERKREG ISO 7380-1 A2 Stainless Steel Button Head Socket Cap Screws are corrosion-resistant fasteners featuring a low-profile, dome-shaped button head with a hexagon socket drive. Manufactured from A2 (SUS304) austenitic stainless steel with a passivated natural finish, these screws combine an aesthetically clean appearance with excellent corrosion resistance. The wide, low button head distributes clamping load over a larger surface area, making them ideal for soft materials, thin panels, and applications where a flush or decorative finish is required.

Product Specifications

  • Standard: ISO 7380-1
  • Material: A2 Stainless Steel (SUS304 / 18-8)
  • Strength Grade: A2-70
  • Tensile Strength: Min. 700 MPa
  • Proof Load Stress (Rp0.2): Min. 450 MPa
  • Hardness: ≤95 HRB (max. 210 HV)
  • Head Type: Button head (low-profile dome)
  • Surface Treatment: Passivation — natural silver finish (pickling & passivation)
  • Thread Type: Metric coarse, full thread
  • Thread Tolerance: 6g
  • Drive Type: Hexagon socket (Allen key / hex key)
  • Sizes Available: M3 – M16

Button Head Design — ISO 7380-1 vs Socket Cap Screw (DIN 912)

Understanding the difference between button head and standard socket cap screws helps you select the right fastener:

Property ISO 7380-1 Button Head DIN 912 Socket Cap Screw
Head profile Low dome (button) Tall cylinder
Head height ∼50% lower than DIN 912 Standard height
Bearing surface area Larger (wider head) Standard
Load distribution Better on soft/thin materials Standard
Appearance Smooth dome — decorative & clean Industrial cylindrical
Max. tightening torque Lower (shallower socket depth) Higher
Best for Panels, enclosures, consumer products, aesthetics High-torque structural joints

Material — A2 Stainless Steel (SUS304) Chemical Composition (%)

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 (ISO 7380-1)

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

  • Low-profile button head — smooth dome design, approximately 50% lower than standard socket cap screws, ideal for space-constrained and aesthetic applications
  • Wide bearing surface — larger head diameter distributes load over a greater area, reducing pull-through risk in soft or thin materials
  • A2 Stainless Steel (SUS304) — excellent corrosion resistance in atmospheric, freshwater, and mild chemical environments
  • Passivated natural finish — clean silver appearance with enhanced oxide layer for superior rust resistance
  • Non-magnetic — suitable for applications sensitive to magnetic interference
  • Hygienic & food-safe — compliant for food processing and medical equipment use
  • RoHS & REACH compliant — no restricted hazardous substances
  • ISO/TS16949 quality management — hardness test, tensile test, and PPAP report available on request

Applications

FULLERKREG ISO 7380-1 A2 stainless steel button head socket cap screws are widely used in:

  • Electronics enclosures and control panels (clean appearance)
  • Consumer products and home appliances
  • Food processing and pharmaceutical machinery
  • Medical devices and laboratory instruments
  • Furniture, fixtures, and architectural hardware
  • Thin sheet metal and panel assemblies
  • Outdoor structures and signage (corrosion resistance)
  • Automotive interior trim and decorative components
  • Any application requiring a low-profile, aesthetically clean fastener

Dimensional Specifications — ISO 7380-1 (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 5.70 5.50 1.65 1.35 2.0 0.74 3.00 2.86
M4 0.7 7.60 7.36 2.20 1.80 2.5 1.05 4.00 3.82
M5 0.8 9.50 9.22 2.75 2.25 3.0 1.35 5.00 4.82
M6 1.0 10.50 10.22 3.30 2.70 4.0 1.60 6.00 5.82
M8 1.25 14.00 13.57 4.40 3.60 5.0 2.20 8.00 7.78
M10 1.5 17.50 17.05 5.50 4.50 6.0 2.75 10.00 9.78
M12 1.75 21.00 20.48 6.60 5.40 8.0 3.30 12.00 11.73
M16 2.0 28.00 27.48 8.80 7.20 10.0 4.40 16.00 15.73

Corrosion Resistance Guide — A2 (SUS304)

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

Frequently Asked Questions

Q: What is the difference between ISO 7380-1 and ISO 7380-2?
ISO 7380-1 is the standard button head socket cap screw with a plain button head. ISO 7380-2 features a button head with a flange (wider bearing surface). This page covers ISO 7380-1 (no flange).

Q: Can button head screws handle the same torque as socket cap screws?
No. Due to the shallower socket depth in the button head, the maximum recommended tightening torque is lower than for standard socket cap screws (DIN 912). Button head screws are not recommended for high-torque structural joints.

Q: Are A2 button head screws magnetic?
A2 stainless steel is generally non-magnetic in the annealed state. Cold working during manufacturing may induce slight magnetism. For strictly non-magnetic applications, please confirm with our technical team.

Q: Can I get material certificates and test reports?
Yes. PPAP reports, material certificates, hardness test reports, and tensile test reports are available upon request for all FULLERKREG products.

Q: What is the minimum order quantity?
We serve B2B wholesale customers. Please contact our sales team for pricing and MOQ details.

Packaging & Availability

  • Standard sizes M3 – M16 available in stock
  • Bulk carton packaging; custom packaging available
  • Material certificates and test reports available on request
  • Custom lengths accepted for large orders

Download Specification

Quality Assurance

All FULLERKREG ISO 7380-1 A2 stainless steel button head socket cap screws are manufactured under strict quality control procedures including:

  • Hardness test (≤95 HRB)
  • Tensile strength test (min. 700 MPa)
  • Dimensional inspection per ISO 7380-1
  • 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.

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