M20x2.5mm Machine Tap DIN 376C HSS-Co5 Form C Right-Hand 35° Flank Chamfer ISO2 6H For Blind Holes - Ruko GmbH

Benefit from the combination of HSS‑Co5 wear resistance, Form C geometry for blind‑hole threads and ISO‑class 6H tolerance to secure consistent M20×2.5 threads in production. Order the machine tap directly via Metav Werkzeuge or ask our consultants if needed.

RUKO Machine Tap DIN 376C M20×2.5 HSS‑Co5 — 6H tolerance, Form C

The RUKO Machine Tap DIN 376C M20×2.5 is a Form C metric ISO tap designed for blind‑hole tapping in unalloyed and alloy steels and non‑ferrous metals, offering a 35° right‑hand helix and ground flank relief for process stability

• HSS‑Co5 for enhanced heat resistance
• Form C geometry for blind‑hole tapping
• ISO thread M20×2.5 with tolerance 6H
• Right‑hand 35° helix and ground flanks

Improved tool life through cobalt‑alloyed high‑speed steel

The use of HSS‑Co5 (high‑speed steel with 5% cobalt) increases red‑hardness and wear resistance compared with conventional HSS, which translates directly into longer service intervals and fewer tool changes. For industrial users this means a measurable reduction in downtime and consistent thread form over longer tool life, maintaining thread quality for serial production and small batch work alike. The material choice supports higher cutting temperatures, reducing the risk of premature tool failure in demanding applications.

Geometry optimised for blind holes and secure chip control

Designed to the DIN 376C Form C specification, the geometry is adapted for blind‑hole tapping: the right‑hand 35° helix and flank relief ground on the cutting edges improve chip formation and evacuation while reducing axial load peaks. This lowers the probability of chip jamming and breakage in blind holes, resulting in fewer rejected components and more predictable machining cycles. The combination of helix angle and flank treatment is particularly beneficial where chip evacuation is constrained.

Clear material range and machine compatibility for planning

Suitable for machining unalloyed and alloy steels up to 1000 N/mm², temper cast iron and non‑ferrous metals, the tool covers a broad workshop spectrum and simplifies tool selection across different workpieces. The M20×2.5 ISO metric thread and 6H tolerance class ensure interchangeable, standardised threads that meet engineering specifications. A shank diameter of 16 mm provides robust seating in standard holders, aiding stable clamping and repeatable alignment in automatic or CNC tapping spindles.

Process integration and handling advantages

With right‑hand cutting direction and machine‑grade shank dimensions, the tap integrates smoothly into existing production routines and tool inventories. The Form C configuration for blind holes reduces rework risk and is particularly well suited to both single‑pass and multi‑station operations. Supplied in single units, the tool is ideal for planned replacements in maintenance cycles or for introduction into quality‑controlled production environments, supporting predictable lead times and inventory management.

Contact Metav Werkzeuge for tailored specification advice and secure supply of the RUKO M20×2.5 HSS‑Co5 machine tap — email info@metav-werkzeuge.com or call +49 2822 7131930 to discuss suitability for specific materials and machines

Technical Data

• Article number: 4000602009NW
• UID: 4000602009NW
• Manufacturer: Ruko GmbH

Core data

• Thread: M20×2.5
• Tolerance: 6H (ISO2)
• Shank diameter: 16 mm
• Helix angle: 35°
• Cutting direction: Right‑hand

Features

• Material: HSS‑Co5 (high‑speed steel with 5% cobalt)
• Form: C (DIN 376C) for blind holes
• Flank relief: Ground
• Application: Unalloyed and alloy steels up to 1000 N/mm²; temper cast iron; non‑ferrous metals
• Standard: Metric ISO thread, DIN 13 sheet 1

FAQ

What materials is this tap suitable for?
The RUKO M20×2.5 HSS‑Co5 machine tap is suitable for unalloyed and alloy steels up to 1000 N/mm², temper cast iron and various non‑ferrous metals.

Is this tap intended for blind or through holes?
This tool is produced to DIN 376C Form C and is intended for blind‑hole tapping, with geometry that improves chip control in enclosed holes.

What does the 6H tolerance mean for component assembly?
Tolerance 6H (ISO2) indicates a standard internal thread tolerance that ensures interchangeability and reliable fit for mating bolts and screws in metric ISO systems.

What is the shank diameter and how does it affect machine mounting?
The shank diameter is 16 mm, which suits common machine tap holders and collets, providing stable clamping and repeatable positioning in production equipment.

Does the tool come with any surface coating?
The supplied specification indicates HSS‑Co5 material only; no coating is listed for this SKU.

Manufacturer/Responsible: Ruko GmbH Präzisionswerkzeuge, Robert‑Bosch‑Strasse 7, 71088 Holzgerlingen