RUKO HGB-DIN352-HSS-60°-M39x4.00mm Hand Tap

The RUKO HGB-DIN352-HSS-60°-M39x4.00mm hand tap is a precision finishing tap for cutting metric coarse threads in through and blind holes. Its M39 x 4.00 mm thread and 6H tolerance class deliver consistent, accurate threads in unalloyed and low-alloyed steels, cast iron, and non-ferrous metals. The bright, ground thread profile and four flutes ensure efficient chip evacuation and a clean finish.

Highlights

• Metric coarse thread M39 with 4.00 mm pitch
• High-speed steel (HSS) for durability
• DIN 352 standard, 60° flank angle, right-hand cutting
• Ground thread with 4 flutes for smooth cutting
• Tolerance class 6H for precise fit

In daily use

This finishing tap is ideal for final threading operations, producing threads ready for standard fasteners. The square drive (24 mm) fits standard tap wrenches, and the shank diameter of 30 mm provides stability. With a total length of 220 mm and thread length of 70 mm, it suits a range of workpiece thicknesses. For a core hole, drill 35.0 mm diameter before tapping.

Full specifications

• Product Type: Hand Tap
• Thread Type: Metric Coarse Thread
• Nominal Thread Diameter: M39
• Thread Pitch: 4.00 mm
• Tool Standard: DIN 352
• Material: High-Speed Steel (HSS)
• Flank Angle: 60°
• Tolerance Class: 6H
• Cutting Direction: Right-hand
• Application: General purpose threading in unalloyed and low-alloyed steels, cast iron, non-ferrous metals
• Surface Finish: Bright (Uncoated)
• Total Length (L1): 220 mm
• Thread Length (L2): 70 mm
• Shank Diameter (D2): 30 mm
• Square Drive Size (K): 24 mm
• Recommended Core Hole Diameter: 35.0 mm
• Thread Profile: ISO Metric (M)
• Manufacturing Process: Ground Thread
• Number of Flutes: 4
• Tap Type: Finishing Tap (No. 3)

Final note

RUKO's HGB series combines DIN 352 geometry with high-speed steel for reliable, repeatable threading in workshop and industrial environments.