Bordo 7/16" x 18 BSF 1" Chrome Button Die

This 7/16" x 18 BSF Chrome Button Die is designed for cutting, restoring, and cleaning British Standard Fine (BSF) external threads. Split circular chrome alloy button dies are typically used with a die stock handle, making them ideal for threading applications in confined or hard-to-reach areas.

Key Features:

• Thread Standard: British Standard Fine (BSF), a finer-pitch development of the British Standard Whitworth (BSW) thread system.
• Versatile Use:
  • Acts as a thread chaser for restoring damaged or contaminated threads.
  • Capable of cutting new male threads on non-ferrous metals and plastics.
• Material: Chrome alloy construction suitable for general-purpose threading (not recommended for precision, structural, or safety-critical applications).
• Thread Form Details:
  • Finer thread pitch provides increased tensile stress area compared to coarse threads of the same diameter.
  • Improved resistance to thread stripping under higher loads.
  • Ideal for applications involving limited thread engagement or components with thin walls.
  • BSF introduced in 1908 and standardised under BS84:1956.

Technical Specifications:

• Diameter (inch): 7/16
• Pitch (TPI): 18
• Thread Form: BSF

Applications:

BSF threads are widely used in precision engineering, automotive restoration, machinery maintenance, and situations requiring strong, fine-thread fasteners. This button die is ideal for producing or repairing external BSF threads on compatible materials.