Machine Tap JIS B-4430 Form C 35° Spiral Flute HSSE - M 8 x 0.75

This tap is designed for general use and offers the following advantages:

• For easily machinable materials up to 900 N/mm².
• Ideal for unalloyed and low-alloy steels.
• Specifically for use in blind holes.
• Optimized for machine use.

JIS B-4430 & Form C 35° SP Explained:
The JIS B-4430 standard is a Japanese Industrial Standard that defines the specifications and tolerances for threading tools like this tap. Form C describes the chamfer style, which is typically used for blind holes because the chamfer is only 2-3 threads long. The designation 35° SP stands for "Spiral Point" with a rake angle of 35°, which allows for efficient chip evacuation forward, making it easier to cut threads in blind holes.

1. Prepare the Hole: Drill the hole to the correct diameter using the appropriate core drill.
2. Clamp the Tap: Securely clamp the tap into the chuck or the square drive of your machine.
3. Lubrication: Apply a suitable cutting oil to the tap and the hole before starting.
4. Cutting the Thread: Start the machine at the correct speed and carefully feed the tap into the hole until the desired thread depth is reached.
5. Reverse: Engage the reverse function on the machine to cleanly remove the tap from the cut thread.

• Thread Type: Metric ISO Thread DIN 13
• Standard: JIS B-4430
• Form: Form C 35° SP
• Material: HSS-E
• Tolerance: 2B
• Nominal Dimension: D 8 x 0.75
• Overall Length (L1): 70 mm
• Thread Length (L2): 30 mm
• Shank Diameter (D2): 7 mm
• Drive: Square 5 mm
• EAN: 4022835907503
• Article Number: 90750

Q1: What is a "JIS standard"?

JIS stands for Japanese Industrial Standards. The JIS B-4430 standard specifies the dimensions and requirements for threading tools like this tap.

Q2: Why is this tool suitable for blind holes?

This tap has a Form C chamfer. The short chamfer length is ideal for cutting threads almost to the bottom of a blind hole without damaging the tap.

Q3: What is the advantage of the HSSE material?

HSSE is a high-speed steel with a cobalt alloy. It offers increased wear resistance and hardness, which extends the service life of the tap, especially with demanding materials.

Q4: What role does the 35° SP geometry play?

The 35° SP (Spiral Point) geometry directs chips forward and out of the borehole. This is crucial for blind holes, as it prevents chips from accumulating at the bottom of the hole and jamming the tap.

Q5: Can I also use this tap manually?

Although this is possible, this tap, with its square drive and geometry, is designed for machine use. For manual applications, tap sets with a taper tap, second tap, and bottoming tap are typically used.