GY HMT Machine Taps

UNF
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 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: 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 COARSE pitch
Designation d nominal Approximate pitch d1 h9 l L l1 Square a h11 Square l2
No. 0 – 80-UNF 1,524 318 2,50 8,0 41,0 5,0 2,00 4
No. 1 – 72-UNF 1,854 353 2,50 8,0 41,0 5,5 2,00 4
No. 2 – 64-UNF 2,184 397 2,80 9,5 44,5 6,0 2,24 5
No. 3 – 56-UNF 2,515 454 2,80 9,5 44,5 6,0 2,24 5
technical specification FOR fine pitch
Designation d nominal Approximate pitch d1 h9 l L d2 min. l1 Square a h11 Square l2
No. 4 – 48-UNF 2.85 0.53 3.15 11 48 2.12 7 2.5 5
No. 5 – 44-UNF 3.18 0.58 3.15 11 48 2.36 7 2.5 5
No. 6 – 40-UNF 3.51 0.64 3.55 13 50 2.5 7 2.8 5
No. 8 – 36-UNF 4.17 0.71 4.5 13 53 3.15 8 3.55 6
No. 10 – 32-UNF 4.83 0.79 5 16 58 3.55 9 4 7
No. 12 – 28-UNF 5.49 0.91 5.6 17 62 4.25 9 4.5 7
1/4 – 28-UNF 6.35 0.91 6.3 19 66 4.5 11 5 8
5/16 – 24-UNF 7.94 1.06 8 19 69 6 13 6.3 9
3/8 – 24-UNF 9.53 1.06 10 20 76 7.5 15 8 11
technical specification FOR fine pitch
Designation d nominal Approximate pitch d1 h9 l1 L Square a h11 l2
No. 5 – 44-UNF 3.175 0.577 2.24 11 48 1.8 4
No. 6 – 40-UNF 3.505 0.635 2.5 13 50 2 4
No. 8 – 36-UNF 4.166 0.706 3.15 13 53 2.5 5
No. 10 – 32-UNF 4.826 0.794 3.55 16 58 2.8 5
No. 12 – 28-UNF 5.486 0.907 4 17 62 3.15 6
1/4 – 28-UNF 6.35 0.907 4.5 19 66 3.55 6
5/16 – 24-UNF 7.938 1.058 6.3 19 69 5 8
3/8 – 24-UNF 9.525 1.058 7.1 20 76 5.6 8
7/16 – 20-UNF 11.112 1.27 8 22 82 6.3 9
1/2 – 20-UNF 12.7 1.27 9 24 84 7.1 10
9/16 – 18-UNF 14.288 1.411 11.2 25 90 9 12
5/8 – 18-UNF 15.875 1.411 12.5 25 95 10 13
3/4 – 16-UNF 19.05 1.588 14 29 104 11.2 14
7/8 – 14-UNF 22.225 1.814 16 33 113 12.5 16
1 – 12-UNF 25.4 2.117 18 35 120 14 18
1 1/8 – 12-UNF 28.575 2.117 20 37 127 16 20
1 1/4 – 12-UNF 31.75 2.117 22.4 37 137 18 22
1 3/8 – 12-UNF 34.925 2.117 25 39 144 20 24
1 1/2 – 12-UNF 38.1 2.117 28 39 149 22.4 26