Machine Tap JIS B-4430 Form C 35° Spiral Flute HSS-G - Rc (BSPT) 1/16 x 28

This machine tap is designed for the following applications:

• For general use in metalworking.
• Suitable for non-abrasive materials up to 900 N/mm², especially unalloyed and low alloyed steels.
• Usable for manual and machine tapping.
• Particularly suitable for blind holes.
• Taper pipe thread Rc (BSPT), taper 1:16, 55° flank angle – self-sealing.

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 both the tool and the hole.
4. Starting: Position the tap vertically and rotate clockwise with steady pressure until it cuts in.
5. Tapping: Continue rotating smoothly. The 35° spiral flute aids chip evacuation in blind holes. Reapply lubricant regularly.
6. Finishing: Once the required depth is reached, carefully remove the tap by rotating counterclockwise.
7. Inspection: Clean the finished thread and check it with a gauge or mating part.

• Thread type Rc (BSPT) – taper pipe thread
• Taper/Angle 1:16 taper, 55° flank angle
• Form Form C 35° Spiral Flute (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 4022835977025
• Article number 97702
• Application Hand and machine use; blind holes; steels ≤ 900 N/mm²

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

A1: Rc refers to 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 C 35° Spiral Flute mean?

A2: The Form C 35° Spiral Flute design optimizes chip evacuation, especially in blind holes, ensuring cleaner and more reliable threading.

Q3: What are the benefits of HSS-G?

A3: HSS-G (ground high speed steel) offers high accuracy, extended tool life, and smoother thread surfaces.

Q4: Which materials can this tap be used on?

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

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

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