Product Description
1/4″-20 UNC A2 Stainless Steel Hexagon Set Screws
These 1/4″ UNC A2 stainless steel hexagon set screws feature a fully threaded shank and a standard 20 threads-per-inch Unified National Coarse thread. They provide good resistance to everyday corrosion and are suitable for machinery, automotive work, restoration, fabrication and general imperial fastening applications.
The 7/16″ external hexagon head allows installation using a standard imperial spanner or socket. The fully threaded design is useful where adjustment is required or where the mating nut or tapped hole needs to engage close to the underside of the head.
Product Details
- Thread size: 1/4″-20 UNC
- Thread series: Unified National Coarse
- Threads per inch: 20 TPI
- Material: A2 stainless steel
- Head style: External hexagon head
- Spanner size: 7/16″
- Nominal head height: 5/32″
- Thread coverage: Fully threaded
- Available lengths: 1/2″ to 3″
- Length measurement: From beneath the head
Screw length is measured from beneath the hexagon head to the end of the threaded shank.
Benefits of A2 Stainless Steel
- Good resistance to moisture and atmospheric corrosion
- Suitable for many indoor and general outdoor applications
- No protective zinc coating to chip or wear away
- Clean appearance suitable for exposed assemblies
- Fully threaded design provides maximum adjustment and engagement
Typical Applications
- Automotive, motorcycle and classic vehicle restoration
- Machinery and imperial equipment
- Engineering and fabrication
- Brackets, panels and equipment enclosures
- Agricultural and workshop equipment
- General maintenance and repair work
Installation Guidance
Confirm that the mating nut or tapped hole has a 1/4″-20 UNC thread. These screws must not be confused with 1/4″-28 UNF fasteners, which have a finer and incompatible thread.
Install using a correctly fitting 7/16″ imperial spanner or socket. Stainless steel threads can gall or seize when assembled quickly, without lubrication or under high tightening pressure. A suitable anti-seize compound may be beneficial where repeated assembly is expected.
A2 stainless steel is suitable for many general applications but may not be appropriate for prolonged exposure to seawater, salt spray or strongly chlorinated environments. A4 stainless steel should be considered for demanding marine and chloride-rich conditions.
Please select the required screw length and pack quantity from the options provided.
| A | B | C | D | E |
| 1/4" | 1 1/4" | 7/16" | 5/32" | 20 |
| 1/4" | 1" | 7/16" | 5/32" | 20 |
| 1/4" | 1/2" | 7/16" | 5/32" | 20 |
| 1/4" | 3/4" | 7/16" | 5/32" | 20 |
| 1/4" | 5/8" | 7/16" | 5/32" | 20 |
| 1/4" | 2" | 7/16" | 5/32" | 20 |
| 1/4" | 1 3/4" | 7/16" | 5/32" | 20 |
| 1/4" | 3" | 7/16" | 5/32" | 20 |
| 1/4" | 2 1/2" | 7/16" | 5/32" | 20 |
| 1/4" | 1 1/2" | 7/16" | 5/32" | 20 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
