Stocked in 95A Durometer, urethane tubes and urethane springs are useful in applications where vibration, corrosion and magnetism prevent the use of steel springs. Also, urethane springs have proven to be safest, most efficient and reliable compression material for punching, stamping and drawing dies.

The K•Prene® urethane Tube/Spring material is a polyether-elastomer that reacts similarly to an incompressible fluid. The volume of material moved by compression is displaced laterally in the form of bulging sides. An approximate change in the diameter of our K•Prene® urethane tube stock can be made by increasing the diameter by the same amount of compression.

Example: A 1.50″ long spring is to be deflected by 15% or .225″. The diameter will then also increase roughly by .225″. The material’s lateral expansion must be considered for many applications.

Urethane Tubes & Springs

The maximum recommended free (unloaded) length is 2.5 times the springs outside diameter, although springs may be stacked with guide rods and washer-shaped spacers.

Suggested maximum cyclic frequencies and deflection percentages of free length are summarized by the following for 95A Durometer Tubes/Springs.

Standard Full-Length K-Prene® Tubes are now Available to Order Online. Custom lengths are available by quote. Request A Quote

Maximum Deflection Cycle Per Hour
Slow speeds of short runs Less than 25% 200
Intermittent Up to 25% 700
Continuous Up to 15% 12,000

Advantages of Urethane Tubes/Springs Vs. Conventional Springs:

  • Abrasion resistance
  • They do not fragmentize
  • High load-carrying capability
  • Protection from marring/galling
  • Longer life
  • Oil and solvent resistance
  • Low noise
  • Vibration damping and shock absorbance
  • 100% load-bearing surface
  • Effectiveness between -30° F. and 180° F.
urethane tube dimension chart

Urethane Tubes & Springs

Fits Punch Body Diam. O.D. Lgth. Part No. (Available for Purchase Online) Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
3/16″ 11/16″ High Press. 1-1/4″ KPS0316H01104 220 – 1036 $4.82
1-1/2 KPS0316H01102 200 – 904 $5.11
12 KPS0316H12000 * – – $21.19
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1/4″ 3/4″ High Press. 1″ KPS0104H01000 325 – 1101 $4.23
1-1/4 KPS0104H01104 250 – 975 $4.82
1-1/2 KPS0104H01102 215 – 790 $5.11
1-3/4 KPS0104H01304 183 – 703 $5.57
12 KPS0104H12000 * – – $21.71
7/8″ Very High Press. 1″ KPS0104V01000 475 1294 – $4.36
1-1/4 KPS0104V01104 350 1131 – $5.00
1-1/2 KPS0104V01102 302 1022 – $5.34
1-3/4 KPS0104V01304 275 – – $5.75
12 KPS0104V12000 * – – $22.93
1″ Ultra High Press. 1″ KPS0104U01000 712 1543 – $4.54
1-1/4 KPS0104U01104 547 1266 – $5.23
1-1/2 KPS0104U01102 399 1082 – $5.57
1-3/4 KPS0104U01304 348 933 – $5.98
12 KPS0104U12000 * – – $24.73
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
5/16″ 13/16″ High Press. 1-1/4″ KPS0516H01104 280 – 1037 $4.93
1-1/2 KPS0516H01102 255 – 936 $5.29
1-3/4 KPS0516H01304 235 – 863 $5.70
2 KPS0516H02000 225 – 809 $6.21
12 KPS0516H12000 * – – $22.29
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
3/8″ 7/8″ High Press. 1″ KPS0308H01000 444 – 1027 $4.54
1-1/4 KPS0308H01104 347 – 957 $5.23
1-1/2 KPS0308H01102 275 – 910 $5.57
1-3/4 KPS0308H01304 224 – 876 $6.03
2 KPS0308H02000 199 – 851 $6.62
12 KPS0308H12000 * – – $24.90
1″ Very High Press. 1″ KPS0308V01000 575 1501 – $4.70
1-1/4 KPS0308V01104 475 1265 – $5.39
1-1/2 KPS0308V01102 389 1108 – $5.75
1-3/4 KPS0308V01304 325 998 – $6.27
2 KPS0308V02000 286 912 – $6.86
12 KPS0308V12000 * – – $26.41
1-1/8″ Ultra High Press. 1″ KPS0308U01000 800 2071 – $4.82
1-1/4 KPS0308U01104 593 1729 – $5.62
1-1/2 KPS0308U01102 522 1501 – $6.03
1-3/4 KPS0308U01304 450 1338 – $6.50
2 KPS0308U02000 387 1215 – $7.20
12 KPS0308U12000 * – – $28.38
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1/2″ 1″ High Press. 1″ KPS0102H01000 512 – 1143 $4.18
1-1/4 KPS0102H01104 340 – 1025 $4.64
1-1/2 KPS0102H01102 325 – 946 $5.05
1-3/4 KPS0102H01304 275 – 878 $5.62
2 KPS0102H02000 250 – 834 $5.93
24 KPS0102H24000 * – – $41.05
1-1/8″ Very High Press. 1″ KPS0102V01000 681 1709 – $4.36
1-1/4 KPS0102V01104 525 1475 – $4.88
1-1/2 KPS0102V01102 424 1318 – $5.34
1-3/4 KPS0102V01304 350 1207 – $5.98
2 KPS0102V02000 320 1123 – $6.27
24 KPS0102V24000 * – – $45.51
1-1/4″ Ultra High Press. 1″ KPS0102U01000 863 2188 – $4.59
1-1/4 KPS0102U01104 675 1793 – $5.16
1-1/2 KPS0102U01102 550 1529 – $5.70
1-3/4 KPS0102U01304 492 1341 – $6.09
2 KPS0102U02000 450 1200 – $6.73
24 KPS0102U24000 * – – $50.98
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
5/8″ 1-1/8″ High Press. 1″ KPS0508H01000 562 – 1224 $4.46
1-1/4 KPS0508H01104 446 – 1169 $5.00
1-1/2 KPS0508H01102 375 – 1133 $5.47
1-3/4 KPS0508H01304 323 – 1107 $6.16
2 KPS0508H02000 295 – 1087 $6.50
24 KPS0508H24000 * – – $48.01
1-1/4″ Very High Press. 1″ KPS0508V01000 794 1855 – $4.64
1-1/4 KPS0508V01104 600 1624 – $5.23
1-1/2 KPS0508V01102 510 1310 – $5.80
1-3/4 KPS0508V01304 424 1232 – $6.56
2 KPS0508V02000 384 1185 – $6.86
24 KPS0508V24000 * – – $52.77
1-3/8″ Ultra High Press. 1″ KPS0508U01000 975 2462 – $4.88
1-1/4 KPS0508U01104 775 2129 – $5.52
1-1/2 KPS0508U01102 640 1907 – $6.10
1-3/4 KPS0508U01304 546 1749 – $6.97
2 KPS0508U02000 489 1630 – $7.32
24 KPS0508U24000 * – – $57.99
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
3/4″ 1-3/8″ High Press. 1-1/4″ KPS0304H01104 747 – 1725 $6.44
1-1/2 KPS0304H01102 642 – 1623 $7.02
1-3/4 KPS0304H01304 554 – 1550 $7.55
2 KPS0304H02000 479 – 1495 $8.24
2-1/4 KPS0304H02104 417 – 1452 $8.71
2-1/2″ KPS0304H02102 380 – 1418 $9.23
24 KPS0304H24000 * – – $59.16
1-1/2″ Very High Press. 1-1/4″ KPS0304V01104 975 2390 – $6.73
1-1/2 KPS0304V01102 810 2105 – $7.43
1-3/4 KPS0304V01304 688 1902 – $8.01
2 KPS0304V02000 591 1749 – $8.77
2-1/4 KPS0304V02104 529 1631 – $9.29
2-1/2 KPS0304V02102 475 1536 – $9.88
2-3/4 KPS0304V02304 418 1458 – $10.62
24 KPS0304V24000 * – – $65.83
1-3/4″ Ultra High Press. 1-1/4″ KPS0304U01104 1400 3382 – $7.49
1-1/2 KPS0304U01102 1200 3191 – $8.24
1-3/4 KPS0304U01304 1015 2841 – $9.00
2 KPS0304U02000 896 2578 – $9.93
2-1/4 KPS0304U02104 796 2373 – $10.51
2-1/2 KPS0304U02102 707 2210 – $11.27
2-3/4 KPS0304U02304 551 2076 – $12.13
24 KPS0304U24000 * – – $79.41
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
7/8″ 1-5/8″ High Press. 1-1/2″ KPS0708H01102 855 – 2363 $7.49
1-3/4 KPS0708H01304 780 – 2213 $8.13
2 KPS0708H02000 745 – 2141 $8.94
2-1/4 KPS0708H02104 700 – 2072 $9.41
2-1/2 KPS0708H02102 670 – 1846 $10.04
2-3/4 KPS0708H02304 610 – 1741 $10.80
3 KPS0708H03000 560 – 1720 $11.73
24 KPS0708H24000 * – – $67.46
1-3/4″ Very High Press. 1-1/2″ KPS0708V01102 1045 3202 – $7.95
1-3/4 KPS0708V01304 955 2780 – $8.59
2 KPS0708V02000 910 2464 – $9.52
2-1/4 KPS0708V02104 855 2218 – $10.04
2-1/2 KPS0708V02102 820 2021 – $10.74
2-3/4 KPS0708V02304 750 1880 – $11.55
3 KPS0708V03000 675 1726 – $12.59
24 KPS0708V24000 * – – $74.35
2″ Ultra High Press. 1-1/2″ KPS0708U01102 1475 4079 – $8.82
1-3/4 KPS0708U01304 1345 3830 – $9.57
2 KPS0708U02000 1285 3294 – $10.68
2-1/4 KPS0708U02104 1205 3032 – $11.32
2-1/2 KPS0708U02102 1155 2823 – $12.13
2-3/4 KPS0708U02304 1055 2652 – $13.12
3 KPS0708U03000 955 2508 – $14.34
24 KPS0708U24000 * – – $88.28
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1″ 1-3/4″ High Press. 1-1/4″ KPS1000H01104 1137 – 2782 $8.01
1-1/2 KPS1000H01102 940 – 2588 $8.71
1-3/4 KPS1000H01304 788 – 2450 $9.41
2 KPS1000H02000 689 – 2346 $10.27
2-1/4 KPS1000H02104 616 – 2265 $10.86
2-1/2 KPS1000H02102 548 – 2201 $11.50
2-3/4 KPS1000H02304 505 – 2148 $12.31
24 KPS1000H24000 * – – $73.78
2″ Very High Press. 1-1/4″ KPS1000V01104 1550 4111 – $8.77
1-1/2 KPS1000V01102 1200 3330 – $9.57
1-3/4 KPS1000V01304 971 2911 – $10.39
2 KPS1000V02000 854 2624 – $11.44
2-1/4 KPS1000V02104 770 2367 – $12.08
2-1/2 KPS1000V02102 700 2262 – $12.89
2-3/4 KPS1000V02304 636 2121 – $13.88
3 KPS1000V03000 569 1985 – $15.09
4 KPS1000V04000 423 1963 – $18.75
24 KPS1000V24000 * – – $87.71
2-1/2″ Ultra High Press. 1-1/4″ KPS1000U01104 2593 – – $12.31
1-1/2 KPS1000U01102 2136 4582 – $13.58
1-3/4 KPS1000U01304 1796 4129 – $14.68
2 KPS1000U02000 1524 3790 – $16.14
2-1/4 KPS1000U02104 1316 3525 – $17.07
2-1/2 KPS1000U02102 1212 3314 – $18.23
2-3/4 KPS1000U02304 1106 3061 – $19.63
3 KPS1000U03000 996 2851 – $21.37
4 KPS1000U04000 734 2272 – $26.53
24 KPS1000U24000 * – – $124.57
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1-1/4″ 2-1/2″ High Press. 2″ KPS1104H02000 1860 – – $15.50
2-1/4 KPS1104H02104 1750 – – $16.37
2-1/2 KPS1104H02102 1675 – – $17.42
2-3/4 KPS1104H02340 1530 – – $18.75
3 KPS1104H03000 1380 – – $20.38
24 KPS1104H24000 * – – $116.61
Fits Punch Body Diam. O.D. Lgth. Part No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1-1/2″ 2-3/4″ High Press. 2″ KPS1102H02000 2105 – – $17.01
2-1/4 KPS1102H02104 1980 – – $18.00
2-1/2 KPS1102H02102 1900 – – $19.22
2-3/4 KPS1102H02304 1730 – – $20.72
3 KPS1102H03000 1565 – – $22.58
24 KPS1102H24000 * – – $134.56

Tubes/Springs – 12″ Lengths

Additional sizes of tubes and springs are listed below. We may be able to accommodate you with additional sizes beyond what you see here. Please Contact us if you would like to discuss another option, special durometer or sizing. In addition we are able to cut these to specific sizes and color them based on your drawing or specifications.

Tubes/Springs – 24″ Lengths

Urethane Tubes & Springs – Metric

I.D. mm O.D. mm Lgth. mm Price
7 15 500 $32.22
8.5 20 500 $40.87
14 30 500 $52.77
14 40 500 $74.99
14 50 500 $78.89
14 60 500 $104.25
11 25 500 $47.89
22 80 500 $151.67
22 100 500 $215.64

Contact the Acrotech Team to Request a Quote!

Standard Full-Length K-Prene® Tubes are now Available to Order Online. Custom lengths are available by quote.