GY HMT HSS Ground Thread Machine Taps

Coarse Pitch & Fine Pitch
As per IS:6175 Part 2 & 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 IS: 6175 Part 2 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.
Unless otherwise specified No. 2 – Form D non-serial screwing tap shall be supplied.
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
Size (mm) Nominal Dia (D) Pitch d (h9) l L d1 (Min) l1 Square a (h11) Square l2
M 3 x 0.5 3 0.5 3.15 11 48 2.12 7 2.5 5
M 3.5 x 0.6 3.5 0.6 3.55 13 50 2.5 7 2.8 5
M 4 x 0.7 4 0.7 4 13 53 2.8 8 3.15 6
M 4.5 x 0.75 4.5 0.75 4.5 13 53 3.15 8 3.55 6
M 5 x 0.8 5 0.8 5 16 58 3.55 9 4 7
M 6 x 1 6 1 6.3 19 66 4.5 11 5 8
M 7 x 1 7 1 7.1 19 66 5.3 11 5.6 8
M 8 x 1.25 8 1.25 8 22 72 6 13 6.3 9
M 9 x 1.25 9 1.25 9 22 72 7.1 14 7.1 10
M 10 x 1.5 10 1.5 10 24 80 7.5 15 8 11
technical specification FOR fine pitch
size (mm) Nominal Dia (D) Pitch d (h9) I L d1 (Min) I1 Square a (h11) Square l2
M 3 × 0.35 3 0.35 3.15 11 48 2.12 7 2.5 5
M 3.5 × 0.35 3.5 0.35 3.55 13 50 2.5 7 2.8 5
M 4 × 0.5 4 0.5 4 13 53 2.8 8 3.15 6
M 4.5 × 0.5 4.5 0.5 4.5 13 53 3.15 8 3.55 6
M 5 × 0.5 5 0.5 5 16 58 3.55 9 4 7
M 5.5 × 0.5 5.5 0.5 5.6 17 62 4 9 4.5 7
M 6 × 0.75 6 0.75 6.3 19 66 4.5 11 5 8
M 7 × 0.75 7 0.75 7.1 19 66 5.3 11 5.6 8
M 8 × 0.75 8 0.75 8 16 66 6 13 6.3 9
M 8 × 1 8 1 8 19 69 6 13 6.3 9
M 9 × 0.75 9 0.75 9 16 66 7.1 14 7.1 10
M 9 × 1 9 1 9 19 69 7.1 14 7.1 10
M 10 × 0.75 10 0.75 10 17 73 7.5 15 8 11
M 10 × 1 10 1 10 20 76 7.5 15 8 11
M 10 × 1.25 10 1.25 10 20 76 7.5 15 8 11