Pan Head vs. Socket Head Cap
Comparing 2 standards across 12 specifications. 12 key differences identified.
Pan Head screws (standardized under ISO 7045 and DIN 7985) feature a low-profile rounded top, vertical cylindrical outer sidewalls, and a flat horizontal bottom bearing surface. Providing clean aesthetics and strong clamping force without cutting into workpiece materials, it is the most common machine screw head in electronics and appliance assembly.
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 7045 / DIN 7985 / ASME B18.6.3 | ISO 4762 / DIN 912 / ASME B18.3 |
|
Primary Applications
|
Consumer electronics, sheet metal electrical enclosures, general machinery | Industrial tooling, machine tools, 3D printer extruders, automotive cylinder heads |
|
Head Top Geometry
|
Slightly domed / curved low-profile top surface | — |
|
Outer Edge Geometry
|
Vertical cylindrical sidewalls with smooth radiused top transition | — |
|
Bearing Surface Profile
|
100% Flat horizontal bearing surface | — |
|
Recess Recesses Supported
|
Phillips (PH), Pozidriv (PZ), Torx (TX), Slotted | — |
|
Countersinking Required
|
No (Mounts completely proud of the workpiece surface) | — |
|
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 |