M12x1.75mm Machine Tap DIN 376B HSS Form B Straight Flute 6H ISO2 Through Hole Chamfer - Ruko GmbH

Take advantage of a durable HSS construction and precise ISO metric M12×1.75 thread form to ensure consistent through-thread production; the combination of Form B straight flutes and flank-honing delivers reliable surface finish and long tool life. Order quickly via Metav Werkzeuge or contact Metav’s specialists for application advice.

Machine Tap DIN 376B M12 x 1.75 HSS 6H – RUKO (Form B, straight-fluted)

The Machine Tap DIN 376B M12 x 1.75 HSS 6H is a Form B, straight-fluted machine tap designed for efficient production of ISO metric through-threads in unalloyed and low-alloy steels, temper cast iron and non‑ferrous metals.

• High-speed steel (HSS) construction
• Form B straight flutes, flank-honed
• ISO metric M12×1.75, tolerance 6H
• Suitable for steels up to 800 N/mm²

Consistent cutting quality for industrial tapping operations

This tap’s HSS material and Form B geometry are aimed at industrial environments where repeatability matters. The straight flute design with flank-honing improves the flank surface of the thread and reduces burr formation, which results in a more accurate thread form and less rework. In practice, this means fewer rejects on serial jobs and more consistent component assembly, making the tool suitable for production lines and machining centres where stable thread profile and predictable wear behaviour are priorities.

Broad material range and application benefits

Designed for a variety of substrates, the tool supports machining of unalloyed and low-alloy steels, temper cast iron and common non‑ferrous metals. The specification indicates suitability for steels up to 800 N/mm² tensile strength, which covers many standard engineering steels used in fixtures, brackets and machine parts. The chamfer for through-threads (Schälanschnitt) ensures reliable chip entry and exit in through-holes, reducing chip packing and the need for frequent tool cleaning during continuous runs.

Precision dimensions and machine compatibility for reliable fits

The tap conforms to DIN 13 (leaf 1) and produces an ISO metric thread M12×1.75 within the ISO2 (6H) tolerance band, providing a standardised fit for mating bolts and components. The shank Ø 9 mm and right-hand cutting direction suit common tapping heads and collet chucks in machining centres. The 6H tolerance ensures a practical balance between assembly clearance and preload in threaded joints, making it appropriate for general engineering and maintenance applications where standardised thread engagement is required.

Operational advantages and maintenance guidance

Using a dedicated machine tap with these characteristics reduces cycle variations and supports predictable tool-change intervals. The straight-flute geometry simplifies chip evacuation in through-holes, while HSS offers good toughness under intermittent cutting conditions. For best results, use appropriate cutting fluid and adhere to manufacturer-recommended spindle speeds and feed rates for the material being machined; this approach prolongs tool life and maintains consistent thread quality, lowering overall process costs and downtime.

For reliable industrial tapping with RUKO precision, contact Metav Werkzeuge in Emmerich for application guidance and fast supply — email info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: 4000601894NW
• Designation: Machine tap DIN 376B M12 x 1.75 HSS 6H RUKO
• Manufacturer: Ruko GmbH Präzisionswerkzeuge
• Packaging unit: 1

Core dimensions

• Thread: M12 x 1.75
• Tolerance field: ISO2 (6H)
• Shank diameter: 9 mm
• Strength suitability: up to 800 N/mm²
• Standard: DIN 13 sheet 1
• Cutting direction: right-hand

Materials & features

• HSS material
• Form B
• Straight-fluted
• Flank-honed (flank-honing)
• Chamfer for through-threads
• For unalloyed and low-alloy steels
• Suitable for temper cast iron
• Suitable for non‑ferrous metals

FAQ

What materials can be machined with this machine tap?
The Machine Tap DIN 376B M12 x 1.75 HSS 6H is suitable for unalloyed and low-alloy steels, temper cast iron and common non‑ferrous metals as stated in the product specification.

What does the 6H tolerance mean for assembly?
Tolerance 6H indicates the ISO2 tolerance band for internal threads; the RUKO machine tap produces a standard fit that balances assembly clearance and secure engagement for typical engineering applications.

Is the shank compatible with standard machine collets?
The tap has a shank diameter of 9 mm, which corresponds to commonly used collets and tapping heads in machining centres equipped for metric tooling.

Does this tap suit through-thread applications?
Yes, the tool is supplied with a chamfer designed for through-threads, improving chip evacuation and reducing the risk of chip congestion during tapping.

Can the tap be used on production machines and tapping heads?
The Form B straight-fluted geometry, HSS construction and right-hand cutting make the tap appropriate for machine tapping operations on compatible tapping heads and CNC machines.

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