Machine Tap JIS B-4430 Form B HSS-G - Rc (BSPT) 1/16 x 28

This machine tap offers the following advantages and applications:

• For general use in metalworking.
• Suitable for non-abrasive materials up to 900 N/mm², especially unalloyed and low alloy steels.
• Can be used for manual and machine tapping.
• Designed specifically for through holes.
• Taper pipe thread Rc (BSPT), taper 1:16, 55° flank angle – self-sealing thread.

1. Preparation: Drill the core hole with the correct nominal diameter for Rc 1/16 x 28. Deburr the hole carefully.
2. Clamping: Secure the tap firmly and perpendicular in a tap wrench or machine holder.
3. Lubrication: Apply cutting oil generously to the tool and hole.
4. Starting: Position the tap vertically and rotate clockwise with steady pressure until it cuts in.
5. Tapping: Continue with a smooth, consistent rotation. The HSS-G geometry provides precise cutting and good chip removal. Reapply lubricant regularly.
6. Finishing: Once the thread depth is reached, carefully rotate the tap counterclockwise to remove it fully.
7. Inspection: Clean the finished thread and check it with a thread gauge or mating part.

• Thread type Rc (BSPT) – taper pipe thread
• Taper/Angle 1:16 taper, 55° flank angle
• Form Form B (JIS B-4430)
• Material HSS-G (ground high speed steel)
• Nominal size PT 1/16 x 28
• Overall length (L1) 55 mm
• Thread length (L2) 17.5 mm
• Shank diameter (D2) 8 mm
• Drive square 6 mm
• EAN 4022835975021
• Article number 97502
• Application Hand and machine tapping; through holes; steels ≤ 900 N/mm²

Q1: What is the difference between Rc and R threads?

A1: Rc stands for the internal taper pipe thread (BSPT), while R refers to the external taper pipe thread. Both are conical (1:16) with a 55° flank angle and provide self-sealing connections.

Q2: What does Form B mean for taps?

A2: Form B has a medium chamfer length, making it particularly suitable for through holes by combining guidance and chip space.

Q3: What are the advantages of HSS-G?

A3: HSS-G is ground high speed steel, providing high dimensional accuracy, improved tool life, and clean thread surfaces.

Q4: Which materials can be tapped with this tool?

A4: Suitable for non-abrasive materials up to 900 N/mm², especially unalloyed and low alloy steels.

Q5: Can this tap be used both manually and with machines?

A5: Yes, it is designed for universal use in both hand and machine tapping with proper clamping and lubrication.