RUKO HGB Set 2-Piece DIN 2181 Metric Fine M4 x 0.35 mm Hand Tap Set

Cutting precise M4 fine threads by hand in tough materials can be slow and frustrating without the right tool. This RUKO two-piece tap set solves that problem by giving you a matched pair of high-speed steel taps that follow the DIN 2181 standard, so you can produce clean, accurate M4 x 0.35 mm threads in through holes with confidence.

Who is it for

This set is for machinists, metalworkers, and maintenance technicians who need to create or repair fine metric threads in unalloyed and low-alloyed steels, malleable cast iron, or non-ferrous metals. It works with a standard tap wrench and is intended for through holes.

Main features

• Metric fine thread M4 with 0.35 mm pitch, tolerance class ISO 2 (6H)
• Two-piece set: taper tap for starting and second tap for finishing
• High-speed steel, ground (HSS-G) for durability and clean cutting
• Right-hand cutting direction, 3 flutes for efficient chip removal
• Bright uncoated finish, suitable for materials up to 800 N/mm² hardness

Specifications

• Thread type: Metric Fine (MF)
• Nominal diameter: M4
• Thread pitch: 0.35 mm
• Standard: DIN 2181
• Material: HSS-G (High Speed Steel - Ground)
• Set composition: 2-piece (Taper Tap, Second Tap)
• Tolerance class: ISO 2 (6H)
• Cutting direction: Right-hand
• Application: For through holes
• Total length (L1): 45 mm
• Thread length (L2): 13 mm
• Shank diameter (d2): 4.5 mm
• Square drive (k): 3.4 mm
• Number of flutes: 3
• Surface finish: Bright (uncoated)
• Recommended core hole diameter: 3.65 mm
• Recommended material hardness: Up to 800 N/mm²
• Suitable for materials: Unalloyed and low-alloyed steels, malleable cast iron, non-ferrous metals

Tips

Drill the core hole to 3.65 mm before tapping. Use cutting oil and reverse the tap every half turn to break chips. Start with the taper tap, then finish with the second tap for full thread depth.