Allen Socket Head Screw
Cylindrical-head fasteners with internal hex drive per DIN 912 / ISO 4762, designed for high-strength fastening in confined spaces. Manufactured in alloy and stainless steel, property classes 8.8 through 12.9, metric sizes M1.6 to M64.
Specification
#
Standard
DIN 912 / ISO 4762 (EN ISO 4762)
Material
Alloy Steel
Thread
Coarse (standard)
Grade
12.9
Coating
Black oxide
Head Type
Cylindrical with hexagon socket
Drive Type
Hexagon socket (Allen key/hex wrench)
Stock
In stock
Dimension
#
Size (d mm)
Thread Dia (min-max mm)
Pitch
Length (mm)
Thread Length (mm)
M3
2.87-3.00
0.5
8-40
18
M6
5.85-6.00
1.0
10-100
24
M8
7.83-8.00
1.25
12-120
28
M10
9.82-10.00
1.5
16-150
32
M12
11.79-12.00
1.75
20-200
36
- All dimensions in mm, tolerance +/- 0.01 mm. Additional dimensions available on request.
Benefits
#
Socket head cap screws solve the fundamental engineering challenge of achieving full clamp load in space-constrained assemblies. Unlike hex bolts that require external wrench clearance on both sides of the joint, the internal hex socket allows tightening from one side using a compact Allen key. The cylindrical head maintains full shank tensile strength, enabling designers to utilise the complete load capacity of the fastener without geometric compromise.
In precision machinery and tooling, the smooth cylindrical head doubles as a locating surface, reducing the need for separate dowel pins. The availability across property classes 8.8, 10.9, and 12.9 allows engineers to match fastener strength to specific joint requirements, from general-purpose assemblies to dynamically loaded structural connections. Standard metric availability from M1.6 to M64 ensures design flexibility across equipment scales.
Common Applications
#
Socket head cap screws are specified in applications requiring high clamp load, confined-space installation, and precision positioning.
- Machine tool construction and CNC equipment
- Automotive engine and transmission assemblies
- Aerospace structural joints and airframe components
- Hydraulic and pneumatic cylinder assemblies
- Precision machinery and instrumentation
- Mold and die construction
- Robotics and automation equipment
- Industrial gearboxes and power transmission
- Semiconductor manufacturing equipment
- Fixture and jig construction
Read Me
| Standard | DIN 912 / ISO 4762 (EN ISO 4762) |
| Material | Alloy Steel |
| Thread | Coarse (standard) |
| Grade | 12.9 |
| Coating | Black oxide |
| Head Type | Cylindrical with hexagon socket |
| Drive Type | Hexagon socket (Allen key/hex wrench) |
| Stock | In stock |
| Size (d mm) | Thread Dia (min-max mm) | Pitch | Length (mm) | Thread Length (mm) |
|---|---|---|---|---|
| M3 | 2.87-3.00 | 0.5 | 8-40 | 18 |
| M6 | 5.85-6.00 | 1.0 | 10-100 | 24 |
| M8 | 7.83-8.00 | 1.25 | 12-120 | 28 |
| M10 | 9.82-10.00 | 1.5 | 16-150 | 32 |
| M12 | 11.79-12.00 | 1.75 | 20-200 | 36 |
