Machine Tap JIS B-4430 Form C 35° Spiral Flute HSS-G - Rc (BSPT) 1/4 x 19

• Cut internal threads in a machine setup where repeatability and controlled feed are required.
• Process: manual driving or assisted driving depending on your holder and machine setup
• Use: thread cutting, re tapping, and thread cleaning depending on condition
• Use a suitable tapping chuck or rigid holder and keep axial alignment to reduce side load.
• Manage lubrication and chip evacuation to limit torque and improve thread surface quality.
• Spiral flute designs support chip evacuation out of blind holes when used with appropriate process parameters.

Note Keep the setup clean and check the thread with a gauge or mating part after cutting.

• Supports repeatable threading in machine assisted processes
• Designed for controlled feed and consistent thread quality
• Efficient for production workflows when a stable setup is available
• Ground tool geometry can support consistent cutting action

• High torque applications can require stronger tooling and rigid fixturing
• Manual operation is slower than automated production methods

1. Prepare the hole according to the specified thread standard and add an entry chamfer.
2. Clamp the workpiece rigidly and ensure the spindle axis is aligned to the hole.
3. Mount the tap in a suitable tapping chuck or rigid holder.
4. Apply a tapping lubricant appropriate for the material and process.
5. Set a controlled feed that matches the thread pitch and start the cut.
6. Maintain lubrication and monitor chip evacuation from the flutes.
7. Retract the tap under control after reaching the required thread depth.
8. Clean the thread and verify the functional fit.

• 1 piece Machine Tap JIS B-4430 Form C 35° Spiral Flute HSS-G - Rc (BSPT) 1/4 x 19

• Product type: Machine Tap
• Standard: JIS B-4430
• Tool material: HSS-G
• Thread designation: Rc (BSPT) 1/4 x 19
• Thread system: R (BSPT)
• Chamfer form: Form C
• Flute design: Spiral flute

How do you select the correct thread designation for this tool
Match the designation Rc (BSPT) 1/4 x 19 to the drawing and mating part, then confirm that the hole type and process match the tool design.

Which holder is typically used for machine tapping
A tapping chuck or rigid holder is commonly used, and alignment to the hole axis is critical to prevent side load on the tap.

How do you reduce the risk of tap breakage
Keep alignment, use suitable lubrication, avoid side loading, and clear chips from the flutes so torque does not rise suddenly.

Which workpiece materials are typical for this threading tool
Thread cutting tools are commonly used in steels, cast iron, and many non ferrous alloys, but you should adapt lubricant choice and process control for hard, sticky, or abrasive materials.

What does R (BSPT) mean in the thread designation
R (BSPT) indicates a British Standard Pipe taper thread used where the thread flank engagement contributes to sealing.

Do you need lubrication and how do you manage chips
Use a cutting fluid suitable for the material to reduce friction, and clear chips from the flutes during the process to keep torque stable.

Where can you find additional technical information for selection and standards
For an overview of threading tools and related standards, refer to the VD 23 catalog as PDF.