HTD Timing Belt Pulleys: Optimal Load Capacity and Low-Noise Performance

In 1973, the American company UNIROYAL developed a single arc tooth profile (HTD) timing belt, which could reduce the belt’s deformation effects and distribute stress more reasonably. This innovation has found widespread applications. Meanwhile, the American company GATES invented the more precise curvilinear tooth (GT) timing belt. These two models appear similar at a glance, but they do have differences and are suited for distinct environments.

HTD timing pulleys picture

HTD timing belt pulleys are widely used, with specific models such as 3M, 5M, 8M, and 14M, among which 3M and 5M are the most common. These pulleys are commonly found in machinery, instruments, and equipment.

Key characteristics:

  • High load-bearing capacity
  • Low noise at medium to high speeds
  • The tooth heights for different HTD models are as follows:
  • HTD 3M: Tooth height 1.28
  • HTD 5M: Tooth height 2.16
  • HTD 8M: Tooth height 3.54
  • HTD 14M: Tooth height 6.2

HTD timing pulleys Tooth Profile Parameters

Based on the image provided

HTD timing pulleys Tooth profile diagram

HTD timing pulleys Tooth profile

the tooth profile angle for HTD is 14 degrees. It’s crucial for professional manufacturers to pay special attention to this when producing timing belt molds and cutting tools, as it determines the accuracy of HTD timing belt pulleys and belts. Unfortunately, some manufacturers tend to overlook this aspect.

For applications operating at speeds below 2000 RPM, our sanmin Gears engineers recommend using HTD timing belt pulleys and belts. For speeds above 2000 RPM, STPD timing belt pulleys and belts are suggested. If high transmission accuracy is required, the GT model of timing belt pulleys and belts is recommended.

Given this information, there are various specifications for HTD models, which can be found in our product content table. You can also refer to the specifications of the HTD5M model in the HTD timing belt pulley series we provide for American companies.

5M standard belt width 15mm, can be changed according to requirements

Specification Teeth Shape Pitch Diameter Outer Diameter W L 1K X Hub Diameter Inner Hole Through Hole Outer Diameter Rib Outer Rib Inner Diameter Rib Type
5M 14 A/B 22.28 21.14 20 28 16 12 6 25 14 F-102514
5M 15 A/B 23.87 22.73 20 28 16 13 6 28 18 F-102818
5M 16 A/B 25.46 24.32 20 28 16 15 6 31 20 F-103120
5M 18 A/B 28.65 27.50 20 28 16 18 6 33 22 F-103322
5M 19 A/B 30.24 29.10 20 28 16 19 6 35 22 F-103522
5M 20 A/B 31.83 30.69 20 28 16 20 8 35 22 F-103522
5M 21 A/B 33.42 32.28 20 28 16 22 8   38 26 F-103826
5M 22 A/B 35.01 33.87 20 28 16 22 8 38 26 F-103826
5M 24 A/B 38.20 37.05 20 28 16 26 8 43 28 F-104328
5M 25 A/B 39.79 38.65 20 28 16 28 8 44 32 F-104432
5M 26 A/B 41.38 40.24 20 28 16 28 10 47 34 F-104734
5M 28 A/B 44.56 43.42 20 28 16 30 10 48 36 F-104836
5M 30 A/B 47.75 46.60 20 28 16 32 10 51 36 F-104836
5M 32 A/B 50.93 49.79 21 28 16 34 10 55 39 F-155539
5M 34 A/B 54.11 52.98 21 28 16 36 12 57 41 F-155741
5M 36 A/B 57.30 56.15 21 28 16 38 12 61 48 F-156148
5M 38 A/B 60.48 59.34 21 28 16 38 12 65 50 F-156550
5M 40 A/B 63.66 62.52 21 28 16 40 12 69 50 F-156950
5M 42 A/B 66.85 65.70 21 28 16 42 12 69 50 F-156950
5M 46 A/B 73.21 72.07 21 28 16 44 12 78 58 F-157858
5M 48 A/B 76.69 75.25 21 28 16 46 12 83 63 F-158363
5M 50 W 79.58 78.43 21 28 16 7 46 12 58 83 63 F-158363
5M 54 W 85.94 84.80 21 28 16 7 48 12 60 91 72 F-159172
5M 56 W 89.13 87.98 21 28 16 7 50 12 64 94 74 F-159474
5M 58 W 92.31 91.17 21 28 16 7 50 12 71 97 80 F-159780
5M 60 W 95.48 94.35 21 28 16 7 52 12 74 97 80 F-159780
5M 72 W 114.59 113.45 21 28 16 7 56 16 88 119 100 F-15119100
1 reply
  1. Mia Evans says:

    I find it interesting when you said that timing pulleys are used a lot in various models like 3M, 5M, 8M, and 14M, but the most common ones are the 3M and 5M types. It seems like learning about these things will be important for various companies so that they will get the right specifications for their equipment. And having the right components and equipment for their operations will lead to more chances of having successful production results, in my opinion.

    Reply

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