GY HHT HSS Ground Thread Hand Taps

HSS Hand Taps (Serial and Non-Serial Form)
Coarse Pitch & Fine Pitch
As per IS:6175 Part 3 & ISO 529

Our High-Speed Steel (HSS) Hand Taps are engineered for precision internal threading in a wide range of materials. Manufactured in strict accordance with IS: 6175 (Part 3) standard, these tools ensure dimensional accuracy and long-lasting performance for both manual and machine-assisted tapping operations.

Serial Form Hand Taps

Serial taps are designed to distribute the cutting load across three distinct stages. In this set, each tap has a different diameter, allowing for a progressive “roughing to finishing” process that reduces the torque required and minimizes the risk of tap breakage in hard materials.
  • No. 1 (Rougher): Features a long 6-8 thread lead. It does the bulk of the material removal and establishes the initial thread path.
  • No. 2 (Intermediate): Features a 4-5 thread lead. It deepens the threads and brings them closer to the final size.
  • No. 3 (Finisher): Features a short 2-3 thread lead. It cuts the thread to its final tolerance and allows for threading closer to the bottom of a hole.

Non-Serial Form Hand Taps

Non-serial taps (Standard Sets) all share the same full thread diameter but vary in the length of the chamfer (the tapered lead at the tip). These are ideal for general-purpose applications.
  • No. 1 – Form A (Taper): Longest chamfer (6-8 threads). Used to start the threading process, ensuring easy alignment and a gradual cut.
  • No. 2 – Form D (Second/Plug): Medium chamfer (4-5 threads). The most commonly used tap for through-holes or starting blind holes.
  • No. 3 – Form C (Bottoming): Shortest chamfer (2-3 threads). Essential for threading to the very bottom of blind holes where space is limited.

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) 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. For sets please mention serial or non serial sets required.
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