Product Description
1/4 UNC A2 Stainless Countersunk Slotted Machine Screws
1/4-20 UNC countersunk slotted machine screws manufactured from A2 stainless steel. The flat countersunk head fits flush within a correctly prepared countersink.
Key Features
- 1/4-20 UNC thread
- 20 threads per inch
- A2 stainless steel
- Flat countersunk head
- Traditional slotted drive
- Approximately 0.46 inch head diameter
- Available in packs from 5 to 1,000
Available Lengths
1/2", 5/8", 3/4" and 1 1/2".
Length is measured over the complete screw, including the countersunk head.
Standards
ASME B18.6.3:2024 provides the dimensional reference for inch-series countersunk slotted machine screws.
BS 1580-1:2007 covers the 1/4-20 UNC thread form and tolerances. No direct British head standard has been verified.
Useful Links
- 4-40 UNC A2 countersunk slotted machine screws
- 6-32 UNC A2 countersunk slotted machine screws
- 8-32 UNC A2 countersunk slotted machine screws
- 5/16 UNC A2 countersunk slotted machine screws
Confirm that the mating nut or tapped hole has a 1/4-20 UNC thread before installation.
