Product Description
BSF A2 Stainless Steel Nyloc Locking Nuts
These BSF A2 stainless steel Nyloc locking nuts combine a corrosion-resistant stainless steel body with a nylon locking insert. Available in 1/4", 5/16" and 3/8" British Standard Fine threads, they are designed for use with matching BSF bolts, screws and studs.
The nylon insert grips the mating thread to increase resistance to loosening from vibration. The hexagon body allows fitting with a suitable spanner or socket, making these nuts useful for maintenance, restoration and engineering assemblies using BSF fixings.
Key Features
- A2 stainless steel body: corrosion resistance for general indoor and outdoor applications.
- Nylon locking insert: helps resist unintended loosening from vibration.
- BSF thread: British Standard Fine imperial thread for compatible fasteners.
- Hexagon profile: suitable for tightening with a spanner or socket.
- Three thread sizes: 1/4" BSF, 5/16" BSF and 3/8" BSF.
Thread Sizes and Dimensions
| Thread Size | Threads Per Inch | Width Across Flats | Nut Height |
|---|---|---|---|
| 1/4" BSF | 26 TPI | 7/16" | 11/32" |
| 5/16" BSF | 22 TPI | 1/2" | 27/64" |
| 3/8" BSF | 20 TPI | 9/16" | 15/32" |
Dimensions are provided as a guide. If a dimension is critical to your application, please check with us before ordering. Sizes in the selection menu refer to the thread diameter, not the spanner size.
Typical Applications
- Classic vehicle and motorcycle restoration where BSF threads are specified.
- Maintenance and repair of older British machinery.
- Engineering assemblies requiring imperial nylon insert locking nuts.
Choosing and Fitting Your Nuts
Match the nut to the diameter and thread type of your bolt or stud. BSF nuts are not interchangeable with UNC, UNF or metric nuts. Fit the plain metal end onto the fixing first, ensuring the bolt thread fully engages the nylon insert when tightened.
Select your required thread size and pack quantity from the available options.
For help identifying your fixings, see our thread data guide. You can also read our A2 and A4 stainless steel guide for material information.
