Product Description
4BA Solid Brass Countersunk Slotted Machine Screws
4BA countersunk slotted machine screws manufactured from solid brass. These traditional British Association threaded screws are designed for fastening into a corresponding 4BA tapped hole or use with a compatible 4BA nut.
The countersunk head provides a neat, flush finish when installed in a correctly formed countersink. The traditional slotted drive is particularly suitable for restoration work, model engineering, electrical equipment and other applications where a period-correct appearance is required.
Product Specifications
- Thread size: 4BA
- Thread series: British Association
- Nominal thread diameter: 0.142 inch / 3.6mm
- Thread pitch: 0.66mm
- Threads per inch: 38.5 TPI
- Thread angle: 47.5 degrees
- Available lengths: 3/4 inch and 1 inch
- Material: Solid brass
- Finish: Natural brass
- Head style: Countersunk
- Drive type: Slotted
- Thread standard: BS 93:2008
- Fastener type standard: BS 57:1951
Available Sizes
| Thread Size | Length | Thread Pitch | Threads per Inch |
|---|---|---|---|
| 4BA | 3/4 inch | 0.66mm | 38.5 TPI |
| 4BA | 1 inch | 0.66mm | 38.5 TPI |
Typical Applications
- Model engineering and miniature assemblies
- Vintage machinery and vehicle restoration
- Electrical instruments and control equipment
- Switchgear and legacy electrical fittings
- Decorative brass assemblies
- Applications requiring a flush, corrosion-resistant fastener
Countersunk screw length is measured over the complete fastener, including the head. Use only with a matching 4BA internal thread. BA threads have a 47.5-degree thread form and are not interchangeable with metric, UNC, UNF, BSW or BSF threads of a similar diameter.
Use a correctly fitting flat-bladed screwdriver to reduce the risk of marking the brass or damaging the slot. Brass is softer than steel, so these screws should not be excessively tightened or used as substitutes for high-tensile fasteners.
Browse more machine screws, nuts and washers.
Please note: Specifications are provided as a guide. Please contact us before ordering if a particular dimension, brass alloy or standard is critical to your application.
| A | B | C | D | E |
| 4BA | 3/4" | * | * | 38.5 |
| 4BA | 1" | * | * | 38.5 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
