Button Head vs. Socket Head Cap
Comparing 2 standards across 12 specifications. 12 key differences identified.
Button Head Cap Screws (BHCS, standardized under ISO 7380) feature a low-profile rounded dome with a wide load-bearing base and an internal hex or Torx drive recess. Designed for applications requiring a smooth, snag-free finish and low vertical clearance, they provide clean aesthetics on exposed consumer products, 3D printers, and automotive interiors.
Socket Head Cap Screws (SHCS, standardized under DIN 912 and ISO 4762) feature a compact cylindrical head whose height is approximately equal to the screw shank diameter, housing a deep internal hexagonal (Allen) or Torx socket. Engineered for high-tensile alloy steel applications, it allows high-torque fastening inside tight, counterbored machine recesses.
Specification Comparison Table
12 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
ISO 7380-1 / ASME B18.3 | ISO 4762 / DIN 912 / ASME B18.3 |
|
Primary Applications
|
3D printer motion carriages, motorcycle fairings, electronics rack enclosures | Industrial tooling, machine tools, 3D printer extruders, automotive cylinder heads |
|
Head Profile
|
Low-profile smooth domed contour | — |
|
Bearing Base Diameter
|
Extra-wide circular bearing base (approx. 1.75 × shank diameter) | — |
|
Drive Recess
|
Internal Hexagon (Allen) or Hexalobular (Torx / ISO 7380-2) | — |
|
Torque Rating
|
Reduced torque rating compared to DIN 912 socket caps (due to shallower socket depth) | — |
|
Flanged Variant
|
ISO 7380-2 (Button head with integrated wide flange collar) | — |
|
Head Geometry
|
— | Tall cylindrical head with knurled or smooth outer diameter |
|
Head Height Ratio
|
— | Head Height ≈ Screw Major Diameter (H ≈ D) |
|
Head Outer Diameter Ratio
|
— | Head Diameter ≈ 1.5 × Screw Diameter (D_k ≈ 1.5D) |
|
Recessed Drive Type
|
— | Internal Hexagon (Allen) or Hexalobular (Torx) |
|
Standard Steel Property Class
|
— | High-tensile Class 12.9 (1,220 MPa) / Class 10.9 / Class 8.8 / A2-70 Stainless |