GY HML HSS Ground Thread Machine Taps

BSW & BSF Threads, Long Shank
As per ISO 2283

Optimize your machining processes with our versatile range of high-quality taps, engineered for precision and durability. Designed to meet ISO 2283 standards, these tools offer reliable performance across a variety of material applications.

Available Tap Varieties

  • Straight Flute: Standard design for general applications. (Form A,C and D)
  • Spiral Point: Ideal for through-holes, pushing chips forward. (Form B)
  • Spiral Flute 35°: Designed for blind holes to pull chips upward. (Form C/35° Right Spiral Point)

Tap Application Matrix

Tap Variety STRAIGHT FLUTE (Form A,C and D) SPIRAL POINT (Form B) SPIRAL FLUTE 35°(Form C)
Standard Tap – HSS ✓ ✓ ✓
High Performance Tap – HSS-E ✓ ✓ ✓
Type of Hole: Through Hole ✓ ✓
Type of Hole: Blind Hole ✓ ✓

Key Features

    • Standard Compliance: Produced as per ISO: 2283 Part 4 and International specifications for global compatibility.
    • Class of Tolerance:Produced as per 6H. When the screwing tap is desired for class of tolerance other than 6H, class of tolerance 4H or 7H or 7H cut threads as appropriate, shall be mentioned in the designation immediately after the size.
    • Material: Premium Grade High-Speed Steel (HSS) and High-Performance Cobalt HSS (HSS-E) taps. for superior heat resistance and edge retention.
    • Flute Design: Precision-ground straight flutes provide ample space for chip evacuation and lubricant flow.
    • Application: Suitable for alloy steel, carbon steel, cast iron, and non-ferrous materials.
Note: For optimal tool life and thread quality, always use appropriate cutting oil and ensure the pre-drilled hole size matches the recommended tap drill chart.
TECHNICAL SPECIFICATION FOR COARSE PITCH
Designation BSW Designation BSF d nom. Approx Pitch BSW Approx Pitch BSF d1 h9 l max. L h16 Square a h11 Square l2 nom. Tol.
1/8-40-BSW — 3.175 0.635 — 2.24 11 66 1.8 4 ± 0.8
3/16-24-BSW 3/16-32-BSF 4.762 1.058 0.794 3.55 16 79 2.8 5 ± 0.8
— 7/32-28-BSF 5.556 — 0.907 4 17 84 3.15 6 ± 0.8
1/4-20-BSW 1/4-26-BSF 6.35 1.27 0.977 4.5 19 89 3.55 6 ± 0.8
— 9/32-26-BSF 7.144 — 0.977 5.6 19 89 4.5 7 ± 0.8
5/16-18-BSW 5/16-22-BSF 7.938 1.411 1.154 6.3 22 97 5 8 ± 0.8
3/8-16-BSW 3/8-20-BSF 9.525 1.588 1.27 7.1 24 108 5.6 8 ± 0.8
7/16-14-BSW 7/16-18-BSF 11.112 1.814 1.411 8 25 115 6.3 9 ± 0.8
1/2-12-BSW 1/2-16-BSF 12.7 2.117 1.588 9 29 119 7.1 10 ± 0.8
9/16-12-BSW 9/16-16-BSF 14.288 2.117 1.588 11.2 30 127 9 12 ± 0.8
5/8-11-BSW 5/8-14-BSF 15.875 2.309 1.814 12.5 32 137 10 13 ± 0.8
11/16-11-BSW 11/16-14-BSF 17.462 2.309 1.814 14 37 149 11.2 14 ± 0.8
3/4-10-BSW 3/4-12-BSF 19.05 2.54 2.117 14 37 149 11.2 14 ± 0.8
7/8-9-BSW 7/8-11-BSF 22.225 2.822 2.309 16 38 158 12.5 16 ± 0.8
1-8-BSW 1-10-BSF 25.4 3.175 2.54 18 45 172 14 18 ± 0.8