SS Allen Countersunk Socket Screws
Stainless steel hexagon socket countersunk head screws to DIN 7991 / ISO 10642 in A2-70 grade with coarse thread. M3 to M12 range with 90° flat head seating flush in a countersunk hole.
Specification
#
Standard
DIN 7991 (superseded by ISO 10642)
Thread
Coarse (standard)
Material
Stainless Steel 304 (A2)
Grade
A2-70
Stock
In stock (304). Grade 316 available against bulk order
Dimension
#
Size (d mm)
Thread Dia (min-max mm)
Pitch
Length (mm)
Thread Length (mm)
M3
2.98-3.00
0.5
6-30
Full thread
M6
5.97-6.00
1.0
10-60
Full thread
M8
7.96-8.00
1.25
12-80
Full thread
M10
9.96-10.00
1.5
16-100
Full thread
M12
11.95-12.00
1.75
20-120
Full thread
- All dimensions in mm, tolerance +/- 0.01 mm. Additional dimensions available on request.
Benefits
#
Countersunk socket screws address the engineering requirement for a completely flush fastener surface. When seated in a correctly prepared 90° countersunk hole, the flat head sits level with the workpiece, eliminating protrusions that interfere with mating parts, aerodynamic flow, or personnel safety. The conical head geometry provides self-centering alignment during installation, improving positional accuracy in multi-screw patterns. The internal hex socket delivers controlled torque transfer without the cam-out associated with Phillips or slotted drives. Stainless steel construction ensures long-term corrosion resistance without coatings, making these screws suitable for hygienic environments where debris accumulation at fastener sites is unacceptable. In precision machine tools, aerospace panels, and food processing equipment, countersunk socket screws maintain surface flatness and cleanliness while allowing disassembly for maintenance. The 90° metric countersink angle must be matched precisely to avoid uneven seating and compromised clamp load.
Common Applications
#
Countersunk socket screws are used where surface flatness and the absence of protruding fastener heads are critical:
- Machine tool beds and precision surfaces
- Aerospace structural panels and fairings
- Automotive body panels and aerodynamic surfaces
- Conveyor belt systems and guide rails
- Architectural metalwork and decorative panels
- Marine deck plates and hull fittings (A4/316 grade)
- Food processing equipment surfaces
- Robotics frames and linear motion systems
- Mold and die construction
- Electrical enclosure mounting plates
Read Me
| Standard | DIN 7991 (superseded by ISO 10642) |
| Thread | Coarse (standard) |
| Material | Stainless Steel 304 (A2) |
| Grade | A2-70 |
| Stock | In stock (304). Grade 316 available against bulk order |
| Size (d mm) | Thread Dia (min-max mm) | Pitch | Length (mm) | Thread Length (mm) |
|---|---|---|---|---|
| M3 | 2.98-3.00 | 0.5 | 6-30 | Full thread |
| M6 | 5.97-6.00 | 1.0 | 10-60 | Full thread |
| M8 | 7.96-8.00 | 1.25 | 12-80 | Full thread |
| M10 | 9.96-10.00 | 1.5 | 16-100 | Full thread |
| M12 | 11.95-12.00 | 1.75 | 20-120 | Full thread |
