1/2 Allen Grub Screw (Inch)
1/2" cup point grub screws to ASME B18.3 with hex socket drive in Rc 45-53 hardened steel. Inch-series for component fixation on imperial-dimensioned shafts at 1/2-inch diameter.
Specification
#
Standard
ASME B18.3
Material
Alloy Steel
Thread
UNC (Coarse)
Grade
12.9
Coating
Black oxide
Head Type
Headless (no head)
Drive Type
Hexagon socket (Allen key/hex wrench)
Point Type
Cup point (concave depression)
Dimension
#
Size
Thread Dia (d)
Pitch (TPI)
Length(L)
Thread Length (b)
3/16
0.1887-0.1900
24
3/16" - 1"
Full
1/4
0.2489-0.2500
20
1/4" - 1
Full
5/16
0.3113-0.3125
18
5/16" - 1 1/2"
Full
3/8
0.3737-0.3750
16
3/8" - 1 1/2"
Full
1/2
0.4985-0.5000
13
1/2" - 1 1/2"
Full
5/8
0.6232-0.6250
11
5/8" - 1 1/2"
Full
- All dimensions in inches, tolerance +/- 0.001 in. Additional dimensions available on request.
Benefits
#
At 1/2-inch, inch-series grub screws provide headless shaft locking in US-specification equipment and aerospace assemblies. The cup point concentrates force on a small contact area, producing reliable indentation-based locking. The headless form installs below the surface, critical where external heads create interference with adjacent components. ASME B18.3 standardisation ensures dimensional interchangeability. Class 3A thread tolerance provides proper fit in inch-tapped holes.
Common Applications
#
Typical applications for 1/2-inch inch-series grub screws:
- Aerospace and defense equipment
- Industrial valve and actuator assemblies
- Hydraulic cylinder manifold assemblies
- Conveyor roller fixation (inch bores)
- Heavy-duty US-spec coupling assembly
Read Me
| Standard | ASME B18.3 |
| Material | Alloy Steel |
| Thread | UNC (Coarse) |
| Grade | 12.9 |
| Coating | Black oxide |
| Head Type | Headless (no head) |
| Drive Type | Hexagon socket (Allen key/hex wrench) |
| Point Type | Cup point (concave depression) |
| Size | Thread Dia (d) | Pitch (TPI) | Length(L) | Thread Length (b) |
|---|---|---|---|---|
| 3/16 | 0.1887-0.1900 | 24 | 3/16" - 1" | Full |
| 1/4 | 0.2489-0.2500 | 20 | 1/4" - 1 | Full |
| 5/16 | 0.3113-0.3125 | 18 | 5/16" - 1 1/2" | Full |
| 3/8 | 0.3737-0.3750 | 16 | 3/8" - 1 1/2" | Full |
| 1/2 | 0.4985-0.5000 | 13 | 1/2" - 1 1/2" | Full |
| 5/8 | 0.6232-0.6250 | 11 | 5/8" - 1 1/2" | Full |
