The HTD rubber timing belt drive is an advancement on the Imperial trapezoidal toothform, resulting in a more uniform transmission of power when the teeth are in mesh. With better transfer of belt tension to the tension cords, a more uniform distribution of stresses within the tooth profile, the HTD Rubber Belt design results in increased torque transmission.

Rubber back/teeth, Glass fibre reinforced, Nylon fabric tooth facing.
| Standard widths | |||
|---|---|---|---|
| 9mm | 15mm | 25mm | |
| Standard lengths |
|---|
| Belt ref. | Length (mm) | No. teeth |
|---|---|---|
| 225-5M | 225 | 45 |
| 235-5M | 235 | 47 |
| 245-5M | 245 | 49 |
| 255-5M | 255 | 51 |
| 265-5M | 265 | 53 |
| 270-5M | 270 | 54 |
| 275-5M | 275 | 55 |
| 285-5M | 285 | 57 |
| 295-5M | 295 | 59 |
| 300-5M | 300 | 60 |
| 305-5M | 305 | 61 |
| 320-5M | 320 | 64 |
| 325-5M | 325 | 65 |
| 330-5M | 330 | 66 |
| 335-5M | 335 | 67 |
| 345-5M | 345 | 69 |
| 350-5M | 350 | 70 |
| 360-5M | 360 | 72 |
| 365-5M | 365 | 73 |
| 375-5M | 375 | 75 |
| 385-5M | 385 | 77 |
| 390-5M | 390 | 78 |
| 400-5M | 400 | 80 |
| 405-5M | 405 | 81 |
| 420-5M | 420 | 84 |
| 425-5M | 425 | 85 |
| 450-5M | 450 | 90 |
| 455-5M | 455 | 91 |
| 460-5M | 460 | 92 |
| 465-5M | 465 | 93 |
| 475-5M | 475 | 95 |
| 490-5M | 490 | 98 |
| 500-5M | 500 | 100 |
| 510-5M | 510 | 102 |
| 520-5M | 520 | 104 |
| 525-5M | 525 | 105 |
| 535-5M | 535 | 107 |
| 540-5M | 540 | 108 |
| 550-5M | 550 | 110 |
| 565-5M | 565 | 113 |
| 575-5M | 575 | 115 |
| 580-5M | 580 | 116 |
| 600-5M | 600 | 120 |
| 610-5M | 610 | 122 |
| 615-5M | 615 | 123 |
| 620-5M | 620 | 124 |
| 625-5M | 625 | 125 |
| 630-5M | 630 | 126 |
| 635-5M | 635 | 127 |
| Belt ref. | Length (mm) | No. teeth |
|---|---|---|
| 640-5M | 640 | 128 |
| 645-5M | 645 | 129 |
| 665-5M | 665 | 133 |
| 670-5M | 670 | 134 |
| 675-5M | 675 | 135 |
| 700-5M | 700 | 140 |
| 705-5M | 705 | 141 |
| 710-5M | 710 | 142 |
| 740-5M | 740 | 148 |
| 750-5M | 750 | 150 |
| 755-5M | 755 | 151 |
| 770-5M | 770 | 154 |
| 775-5M | 775 | 155 |
| 790-5M | 790 | 158 |
| 800-5M | 800 | 160 |
| 835-5M | 835 | 167 |
| 840-5M | 840 | 168 |
| 850-5M | 850 | 170 |
| 860-5M | 860 | 172 |
| 890-5M | 890 | 178 |
| 900-5M | 900 | 180 |
| 925-5M | 925 | 185 |
| 935-5M | 935 | 187 |
| 940-5M | 940 | 188 |
| 945-5M | 945 | 189 |
| 950-5M | 950 | 190 |
| 980-5M | 980 | 196 |
| 1000-5M | 1000 | 200 |
| 1035-5M | 1035 | 207 |
| 1050-5M | 1050 | 210 |
| 1125-5M | 1125 | 225 |
| 1135-5M | 1135 | 227 |
| 1145-5M | 1145 | 229 |
| 1200-5M | 1200 | 240 |
| 1240-5M | 1240 | 248 |
| 1270-5M | 1270 | 254 |
| 1350-5M | 1350 | 270 |
| 1420-5M | 1420 | 284 |
| 1500-5M | 1500 | 300 |
| 1595-5M | 1595 | 319 |
| 1690-5M | 1690 | 338 |
| 1790-5M | 1790 | 358 |
| 1800-5M | 1800 | 360 |
| 1895-5M | 1895 | 379 |
| 1945-5M | 1945 | 389 |
| 2000-5M | 2000 | 400 |
| 2525-5M | 2525 | 505 |
| 3125-5M | 3125 | 625 |