GY HMT Machine Taps

BSF
ISO 529

The GY HMT Series features a versatile range of High-Speed Steel (HSS) and High-Performance Cobalt HSS (HSS-E) taps. These are designed to handle various materials and hole types, from general-purpose threading to specialized high-speed production.

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 VarietySTRAIGHT 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: 529 or BS 949 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 fine pitch
Designation d nominal Approximate pitch d1 h9 I L d2 min. Square a h11 Square I2
3/16 – 32 – BSF 4.762 0.794 5,00 16,0 58,0 3.55 4,00 7
7/32 – 28 – BSF 5.556 0.907 5,60 17,0 62,0 4,25 4,50 7
1/4 – 26 – BSF 6.350 0.977 6,30 19,0 66,0 4,50 5,00 8
9/32 – 26 – BSF 7.144 0.977 7.1 19,0 66,0 5.6 5.6 8
5/16 – 22 – BSF 7.938 1.154 8,00 22,0 72,0 6,00 6,30 9
3/8 – 20 – BSF 9.525 1.270 10,00 24,0 80,0 7,50 8,00 11
technical specification FOR fine pitch
Designation d nominal Approximate pitch d1 h9 l L Square a h11 Square l2
7/16 – 18 – BSF 11,112 1.414 8,0 25,0 85,0 6,3 9
1/2 – 16 – BSF 12,700 1.588 9,0 29,0 89,0 7,1 10
9/16 – 16 – BSF 14.288 1.588 11,2 30,0 95,0 9,0 12
5/8 – 14 – BSF 15,875 1.814 12,5 32,0 102,0 10,0 13
11/16 – 14 – BSF 17.463 1.814 12,5 37.0 112.0 11.2 14.0
3/4 – 12 – BSF 19.050 1.814 12,5 37.0 112.0 11.2 14.0
7/8 – 11 – BSF 22,225 2.309 16,0 38,0 118,0 12,5 16
1 – 10 – BSF 25,400 2.540 18,0 45,0 130,0 14,0 18
1 1/8 – 9 – BSF 28,575 2.822 20,0 37.0 127.0 16,0 20.0
1 1/4 – 9 – BSF 31,750 2.822 22,4 37.0 137.0 18,0 22.0
1 3/8 – 8 – BSF 34,925 3.175 25,0 39.0 144.0 20,0 24.0
1 1/2 – 8 – BSF 38,100 3.175 28,0 39.0 149.0 22,4 26.0
1 5/8 – 8 – BSF 38,100 3.175 28,0 39.0 149.0 22,4 26.0
1 3/4 – 7 – BSF 44,450 3.629 31,5 45.0 165.0 25,0 28.0
2 – 7 – BSF 50,800 3.629 35,5 45.0 175.0 28,0 31.0
2 1/4 – 6 – BSF 57,150 4.233 40,0 48.0 193.0 31,5 34.0
2 1/2 – 6 – BSF 63,500 4.233 40,0 48.0 193.0 31,5 34.0
2 3/4 – 6 – BSF 69,850 4.233 45,0 48.0 203.0 35,5 38.0
3 – 5 – BSF 76,200 5.080 50,0 51.0 226.0 40,0 42.0
3 1/4 – 5 – BSF 82,550 5.080 50,0 51.0 226.0 40,0 42.0
3 1/2 – 4.1/2 – BSF 88,900 5.644 50,0 51.0 226.0 40,0 42.0