Turkish Customer Facing Mixed Through/Blind-Hole Tapping Issues? DIN371/376 TiN-Coated Machine Tap Package Helps Standardize Production

1. Market Background

Turkey has become an important manufacturing hub between Europe and the Middle East, with a strong base in automotive parts, white goods, hydraulics and general machinery.
Local workshops perform huge volumes of M3–M20 tapping on carbon steels and structural/alloy steels, and they increasingly demand stable tool life and consistent thread quality.

Previously, many end users and distributors used a mix of brands and geometries, which caused:

• Using the same tap type for both through-holes and blind holes, leading to poor chip evacuation and frequent breakage in blind holes;

• Large variation in tool life from batch to batch under the same cutting parameters;

• Complicated stock structure with mixed standards and forms, making warehouse and replenishment difficult.

Distributors started to look for a clear, DIN-based machine tap solution that separates through-hole and blind-hole applications while keeping performance consistent.

2. Customer Profile & Application

Our customer in Turkey is a regional cutting tool and industrial supply distributor, serving:

• Automotive and home appliance component manufacturers;

• Hydraulic/pneumatic valve and pump body producers;

• General machine shops and maintenance companies.

Typical applications:

• M3–M20 steel tapping in through-holes for plates, brackets and housings;

• Blind-hole tapping in valve bodies, housings and tooling components;

• Machine tapping on vertical machining centers, drill-tap centers and turning centers.

Their key requirement: the right geometry for through and blind holes, stable batch performance and unified standards for easy stock management.

3. Our Solution (Product Package & Specifications)

After reviewing workpiece materials and hole types, we supplied a batch of DIN371/376 HSS-M2 TiN-coated machine taps as a complete package:

• Standards: DIN371 / DIN376

  • DIN371: reinforced shank for smaller sizes, ideal for M3–M10;

  • DIN376: standard shank for medium and larger sizes such as M12–M20.

• Size range: M3–M20

• Material: HSS-M2 high speed steel, balancing performance and cost for steels and mild alloy steels;

• Coating: TiN (TIN COATED) for improved surface hardness, wear resistance and high-temperature behavior;

• Geometries: FORM B and FORM C-R35

  • FORM B: straight flute, recommended for through-hole tapping;

  • FORM C-R35: 35° spiral flute, optimized for blind-hole tapping with upward chip evacuation to reduce chip packing and breakage.

• Total quantity: 36,750 pcs

Key Specification Summary (excerpt)

With this package, the distributor can present to end users a complete M3–M20 tapping solution instead of just selling single tap sizes.

4. Customer Feedback

After several months of sales and usage in Turkish workshops, the distributor received positive feedback:

• More stable tapping performance
  FORM B is now dedicated to through-holes and FORM C-R35 to blind holes, significantly reducing breakage and chipping, allowing more stable machine parameters.

• Improved tool life and batch consistency
  HSS-M2 with TiN coating delivers reliable life in medium-strength steels, and life variation between batches has been reduced.

• Cleaner stock structure
  Inventory is now organized by standard (DIN371/376), size range (M3–M20) and geometry (FORM B / FORM C-R35), making sales and replenishment more straightforward.

The customer has positioned this DIN371/376 HSS-M2 TiN machine tap package as their core tapping product in Turkey and plans to promote it as a standard “through + blind-hole” solution when developing new regional dealers and large machining accounts.

5. Conclusion

This shipment of 36,750 pcs DIN371/376 M3–M20 FORM B / FORM C-R35 HSS-M2 TiN-coated machine taps to Turkey helps the distributor upgrade by:

• Replacing scattered, mixed-geometry taps with a unified DIN-based, single-material product system;

• Using FORM B and FORM C-R35 to optimize chip evacuation and tool life for through-holes and blind holes respectively;

• Leveraging one-batch, integrated supply to build a repeatable, standardized tapping product line and strengthen their brand position in the Turkish machining market.