GY HMT HSS Ground Thread Machine Taps

Coarse Pitch & Fine Pitch
As per IS: 6175 Part 3 & 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 3 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
SIZES Nominal Dia D Pitch d h9 I L Square a h11 Square l1
M3 x 0.5 3 0.5 2.24 11 48 1.8 4
M3.5 x 0.6 3.5 0.6 2.5 13 50 2 4
M4 x 0.7 4 0.7 3.15 13 53 2.5 5
M4.5 x 0.75 4.5 0.75 3.55 13 53 2.8 5
M5 x 0.8 5 0.8 4 16 58 3.15 6
M6 x 1 6 1 4.5 19 66 3.55 6
M7 x 1 7 1 5.6 19 66 4.5 7
M8 x 1.25 8 1.25 6.3 22 72 5 8
M9 x 1.25 9 1.25 7.1 22 72 5.6 8
M10 x 1.5 10 1.5 8 24 80 6.3 9
M11 x 1.5 11 1.5 8 25 85 6.3 9
M12 x 1.75 12 1.75 9 29 89 7.1 10
M14 x 2 14 2 11.2 30 95 9 12
M16 x 2 16 2 12.5 32 102 10 13
M18 x 2.5 18 2.5 14 37 112 11.2 14
M20 x 2.5 20 2.5 14 37 112 11.2 14
M22 x 2.5 22 2.5 16 38 118 12.5 16
M24 x 3 24 3 18 45 130 14 18
M27 x 3 27 3 20 45 135 16 20
M30 x 3.5 30 3.5 20 48 138 16 20
M33 x 3.5 33 3.5 22.4 51 151 18 22
M36 x 4 36 4 25 57 162 20 24
M39 x 4 39 4 28 60 170 22.4 26
M42 x 4.5 42 4.5 28 60 170 22.4 26
M45 x 4.5 45 4.5 31.5 67 187 25 28
M48 x 5 48 5 31.5 67 187 25 28
M52 x 5 52 5 35.5 70 200 28 31
M56 x 5.5 56 5.5 35.5 70 200 28 31
M60 x 5.5 60 5.5 40 76 221 31.5 34
M64 x 6 64 6 40 79 224 31.5 34
M68 x 6 68 6 45 79 234 35.5 38
technical specification FOR fine pitch
SIZES Nominal Dia D Pitch d h9 l L Square a h11 Square l₁
M3 × 0.35 3 0.35 2.24 11 48 1.8 4
M3.5 × 0.35 3.5 0.35 2.5 13 50 2 4
M4 × 0.5 4 0.5 3.15 13 53 2.5 5
M4.5 × 0.5 4.5 0.5 3.55 13 53 2.8 5
M5 × 0.5 5 0.5 4 16 58 3.15 6
M5.5 × 0.5 5.5 0.5 4 17 62 3.15 6
M6 × 0.75 6 0.75 4.5 19 66 3.55 6
M7 × 0.75 7 0.75 5.6 19 66 4.5 7
M8 × 0.75 8 0.75 6.3 16 66 5 8
M8 × 1 8 1 6.3 19 69 5 8
M9 × 0.75 9 0.75 7.1 16 66 5.6 8
M9 × 1 9 1 7.1 19 69 5.6 8
M10 × 0.75 10 0.75 8 17 73 6.3 9
M10 × 1 10 1 8 20 76 6.3 9
M10 × 1.25 10 1.25 8 20 76 6.3 9
M11 × 0.75 11 0.75 8 20 80 6.3 9
M11 × 1 11 1 8 20 80 6.3 9
M12 × 1 12 1 9 20 80 7.1 10
M12 × 1.25 12 1.25 9 24 84 7.1 10
M12 × 1.5 12 1.5 9 29 89 7.1 10
M14 × 1 14 1 11.2 22 87 9 12
M14 × 1.25 14 1.25 11.2 25 90 9 12
M14 × 1.5 14 1.5 11.2 30 95 9 12
M15 × 1 15 1 11.2 22 87 9 12
M15 × 1.5 15 1.5 11.2 30 95 9 12
M16 × 1 16 1 12.5 22 92 10 13
M16 × 1.5 16 1.5 12.5 32 102 10 13
M17 × 1 17 1 12.5 22 92 10 13
M17 × 1.5 17 1.5 12.5 32 102 10 13
M18 × 1 18 1 14 22 97 11.2 14
M18 × 1.5 18 1.5 14 29 104 11.2 14
M18 × 2 18 2 14 37 112 11.2 14
M20 × 1 20 1 14 27 102 11.2 14
M20 × 1.5 20 1.5 14 29 104 11.2 14
M20 × 2 20 2 14 37 112 11.2 14
M22 × 1 22 1 16 29 109 12.5 16
M22 × 1.5 22 1.5 16 33 113 12.5 16
M22 × 2 22 2 16 38 118 12.5 16
M24 × 1 24 1 18 29 114 14 18
M24 × 1.5 24 1.5 18 35 120 14 18
M24 × 2 24 2 18 35 120 14 18
M25 × 1 25 1 18 29 114 14 18
M25 × 1.5 25 1.5 18 35 120 14 18
M25 × 2 25 2 18 35 120 14 18
M26 × 1.5 26 1.5 18 35 120 14 18
M27 × 1 27 1 20 30 120 16 20
M27 × 1.5 27 1.5 20 37 127 16 20
M27 × 2 27 2 20 37 127 16 20
M28 × 1 28 1 20 30 120 16 20
M28 × 1.5 28 1.5 20 37 127 16 20
M28 × 2 28 2 20 37 127 16 20
M30 × 1 30 1 20 30 120 16 20
M30 × 1.5 30 1.5 20 37 127 16 20
M30 × 2 30 2 20 37 127 16 20
M30 × 3 30 3 20 48 138 16 20
M32 × 1.5 32 1.5 22.4 37 137 18 22
M32 × 2 32 2 22.4 37 137 18 22
M33 × 1.5 33 1.5 22.4 37 137 18 22
M33 × 2 33 2 22.4 37 137 18 22
M33 × 3 33 3 22.4 51 151 18 22
M35 × 1.5 35 1.5 25 39 144 20 24
M36 × 1.5 36 1.5 25 39 144 20 24
M36 × 2 36 2 25 39 144 20 24
M36 × 3 36 3 25 57 162 20 24
M38 × 1.5 38 1.5 28 39 149 22.4 26
M39 × 1.5 39 1.5 28 39 149 22.4 26
M39 × 2 39 2 28 39 149 22.4 26
M39 × 3 39 3 28 60 170 22.4 26
M40 × 1.5 40 1.5 28 39 149 22.4 26
M40 × 2 40 2 28 39 149 22.4 26
M40 × 3 40 3 28 60 170 22.4 26
M42 × 1.5 42 1.5 28 39 149 22.4 26
M42 × 2 42 2 28 39 149 22.4 26
M42 × 3 42 3 28 60 170 22.4 26
M42 × 4 42 4 28 60 170 22.4 26
M45 × 1.5 45 1.5 31.5 45 165 25 28
M45 × 2 45 2 31.5 45 165 25 28
M45 × 3 45 3 31.5 67 187 25 28
M45 × 4 45 4 31.5 67 187 25 28
M48 × 1.5 48 1.5 31.5 45 165 25 28
M48 × 2 48 2 31.5 45 165 25 28
M48 × 3 48 3 31.5 67 187 25 28
M48 × 4 48 4 31.5 67 187 25 28
M50 × 1.5 50 1.5 31.5 45 165 25 28
M50 × 2 50 2 31.5 45 165 25 28
M50 × 3 50 3 31.5 67 187 25 28
M52 × 1.5 52 1.5 35.5 45 175 28 31
M52 × 2 52 2 35.5 45 175 28 31
M52 × 3 52 3 35.5 70 200 28 31
M52 × 4 52 4 35.5 70 200 28 31
M55 × 1.5 55 1.5 35.5 45 175 28 31
M55 × 2 55 2 35.5 45 175 28 31
M55 × 3 55 3 35.5 70 200 28 31
M55 × 4 55 4 35.5 70 200 28 31
M56 × 1.5 56 1.5 35.5 45 175 28 31
M56 × 2 56 2 35.5 45 175 28 31
M56 × 3 56 3 35.5 70 200 28 31
M56 × 4 56 4 35.5 70 200 28 31
M58 × 1.5 58 1.5 40 48 193 31.5 34
M58 x 2 58 2 40 48 193 31.5 34
M58 x 3 58 3 40 64 209 31.5 34
M58 x 4 58 4 40 64 209 31.5 34
M60 x 1.5 60 1.5 40 48 193 31.5 34
M60 x 2 60 2 40 48 193 31.5 34
M60 x 3 60 3 40 64 209 31.5 34
M60 x 4 60 4 40 64 209 31.5 34
M62 x 1.5 62 1.5 40 48 193 31.5 34
M62 x 2 62 2 40 48 193 31.5 34
M62 x 3 62 3 40 64 209 31.5 34
M62 x 4 62 4 40 64 209 31.5 34
M64 x 1.5 64 1.5 40 48 193 31.5 34
M64 x 2 64 2 40 48 193 31.5 34
M64 x 3 64 3 40 64 209 31.5 34
M64 x 4 64 4 40 64 209 31.5 34
M65 x 1.5 65 1.5 40 48 193 31.5 34
M65 x 2 65 2 40 48 193 31.5 34
M65 x 3 65 3 40 64 209 31.5 34
M65 x 4 65 4 40 64 209 31.5 34
M68 x 1.5 68 1.5 45 48 203 35.5 38
M68 x 2 68 2 45 48 203 35.5 38
M68 x 3 68 3 45 64 219 35.5 38
M68 x 4 68 4 45 64 219 35.5 38
M70 x 1.5 70 1.5 45 48 203 35.5 38
M70 x 2 70 2 45 48 203 35.5 38
M70 x 3 70 3 45 64 219 35.5 38
M70 x 4 70 4 45 64 219 35.5 38
M70 x 6 70 6 45 79 234 35.5 38
M72 x 1.5 72 1.5 45 48 203 35.5 38
M72 x 2 72 2 45 48 203 35.5 38
M72 x 3 72 3 45 64 219 35.5 38
M72 x 4 72 4 45 64 219 35.5 38
M72 x 6 72 6 45 79 234 35.5 38
M75 x 1.5 75 1.5 45 48 203 35.5 38
M75 x 2 75 2 45 48 203 35.5 38
M75 x 3 75 3 45 64 219 35.5 38
M75 x 4 75 4 45 64 219 35.5 38
M76 x 1.5 76 1.5 50 51 226 40 42
M76 x 2 76 2 50 51 226 40 42
M76 x 3 76 3 50 67 242 40 42
M76 x 4 76 4 50 67 242 40 42
M76 x 6 76 6 50 83 258 40 42
M78 x 2 78 2 50 51 226 40 42
M80 x 1.5 80 1.5 50 51 226 40 42
M80 x 2 80 2 50 51 226 40 42
M80 x 3 80 3 50 67 242 40 42
M80 x 4 80 4 50 67 242 40 42
M80 x 6 80 6 50 83 258 40 42
M82 x 2 82 2 50 51 226 40 42
M85 x 2 85 2 50 51 226 40 42
M85 x 3 85 3 50 67 242 40 42
M85 x 4 85 4 50 67 242 40 42
M85 x 6 85 6 50 86 261 40 42
M90 x 2 90 2 50 51 226 40 42
M90 x 3 90 3 50 67 242 40 42
M90 x 4 90 4 50 67 242 40 42
M90 x 6 90 6 50 86 261 40 42
M95 x 2 95 2 56 54 244 45 46
M95 x 3 95 3 56 70 260 45 46
M95 x 4 95 4 56 70 260 45 46
M95 x 6 95 6 56 89 279 45 46
M100 x 2 100 2 56 54 244 45 46
M100 x 3 100 3 56 70 260 45 46
M100 x 4 100 4 56 70 260 45 46
M100 x 6 100 6 56 89 279 45 46