Tap FANAR MASTERTAP UNC 1/4-20 DIN 371C R45 HSSE-PM HL (2BX)

FANAR MASTERTAP UNC 1/4-20 DIN 371C R45 HSSE-PM HL (2BX) is a taper hand tap engineered for cutting UNC 1/4-20 threads in a wide range of ferrous and non-ferrous materials. Manufactured from high-speed steel produced by powder metallurgy (HSSE-PM) and finished with a high-lubricity coating (HL), this DIN 371C style tap features an R45 chamfer for controlled chip formation and reliable engagement when starting threads. The (2BX) designation indicates a second-step chamfer geometry suitable for through holes and many blind-hole applications, providing consistent thread profile and dimensional accuracy for manual and machine tapping operations.

Advantages

The HSSE-PM material offers improved wear resistance and toughness compared with conventional high-speed steels, extending tool life under intermittent or continuous use. The R45 taper chamfer and (2BX) geometry promote predictable cutting performance, easier thread start, and reduced risk of tap breakage. The HL surface treatment reduces friction and helps evacuate chips, supporting smoother tapping cycles and better surface finish of the formed threads.

Suitable for

• Creating UNC 1/4-20 internal threads in steel, stainless steel, aluminum, and cast materials
• Manual hand-tapping and machine tapping where DIN 371C (taper hand tap) geometry is specified
• Through-hole threading and many blind-hole applications with moderate depth
• Repair and maintenance tasks where a robust, wear-resistant tap is required

When it may not be suitable

This taper hand tap may not be the best choice for very deep blind holes where specialized bottoming taps are required to reach full thread depth. It is also less appropriate for extremely brittle materials or highly abrasive composites where specific coatings or alternative geometries would better resist wear and prevent chipping. For production runs requiring the highest cycle counts and fastest feed rates, a specialized spiral-fluted or machine tap could provide improved chip evacuation and throughput.

Key specifications

• Thread profile: UNC 1/4-20
• Tap type and style: taper hand tap, DIN 371C
• Chamfer: R45 taper (2BX chamfer geometry)
• Material: high-speed steel produced by powder metallurgy (HSSE-PM)
• Surface finish: high-lubricity coating (HL)
• Intended use: through holes and many blind holes, manual or machine tapping

How to use

Select the correct pilot hole diameter for UNC 1/4-20 threads and secure the workpiece to prevent movement. Apply appropriate cutting fluid to the hole and tap to reduce friction and improve chip flow. Start the tap square to the workpiece and advance with steady forward pressure; after several turns advance slightly then reverse a turn to break chips and clear the flute. Continue this cycle until the desired thread depth is reached, then back the tap out while maintaining rotation to avoid damaging formed threads. For machine tapping follow the machine manufacturer's feed and speed recommendations for HSSE-PM tools and the workpiece material.

What to consider before purchase

• Confirm the required thread standard is UNC 1/4-20 and that DIN 371C taper hand tap geometry meets your application
• Verify workpiece material and select appropriate cutting fluid and machining parameters for HSSE-PM
• Assess hole depth and whether a taper hand tap (R45) is suitable or if a bottoming or spiral-flute tap is needed
• Ensure compatibility with your tapping method (manual holder or tapping machine) and required accuracy

Usage recommendations

Use a correctly sized pilot drill, moderate cutting speed, and intermittent advancement with chip-breaking reversals when hand tapping. Maintain lubrication and periodic inspection of the tap for wear; replace the tool when thread quality degrades to preserve part accuracy and reduce damage risk.