Tubes, Springs & Caps

tubes-holesStocked in 95A Durometer, tubes/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 Tubes/Springs 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.

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.

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:

  • tubes-springsAbrasion resistance
  • They do not fragmentize
  • High load-carrying capability
  • Protection from marring/galling
  • Longer life
  • Oil and solvent resistance (See chart on page 12)
  • Low noise
  • Vibration damping and shock absorbance
  • 100% load-bearing surface
  • Effectiveness between -30° F. and 180° F.

Tubes/Springs

Fits Punch Body Diam. O.D. Lgth. Order No. 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″ KPS-0316 H01104 220 - 1036 $2.55
1-1/2 KPS-0316 H01102 200 - 904 2.75
12 KPS-0316 H12000 * - - 15.55
Fits Punch Body Diam. O.D. Lgth. Order No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1/4″ 3/4″ High Press. 1″ KPS-0104 H01000 325 - 1101 2.35
1-1/4 KPS-0104 H01104 250 - 975 2.85
1-1/2 KPS-0104 H01102 215 - 790 3.05
1-3/4 KPS-0104 H01304 183 - 703 3.80
12 KPS-0104 H12000 * - - 18.10
7/8″ Very High Press. 1″ KPS-0104 V01000 475 1294 - 2.45
1-1/4 KPS-0104 V01104 350 1131 - 2.95
1-1/2 KPS-0104 V01102 302 1022 - 3.25
1-3/4 KPS-0104 V01304 275 - - 4.00
12 KPS-0104 V12000 * - - 19.45
1″ Ultra High Press. 1″ KPS-0104 U01000 712 1543 - 2.55
1-1/4 KPS-0104 U01104 547 1266 - 3.15
1-1/2 KPS-0104 U01102 399 1082 - 3.50
1-3/4 KPS-0104 U01304 348 933 - 4.35
12 KPS-0104 U12000 * - - 21.00
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-0516 H01104 280 - 1037 3.05
1-1/2 KPS-0516 H01102 255 - 936 3.40
1-3/4 KPS-0516 H01304 235 - 863 3.80
2 KPS-0516 H02000 225 - 809 4.20
12 KPS-0516 H12000 * - - 20.60
Fits Punch Body Diam. O.D. Lgth. Order No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
3/8″ 7/8″ High Press. 1″ KPS-0308 H01000 444 - 1027 2.75
1-1/4 KPS-0308 H01104 347 - 957 3.40
1-1/2 KPS-0308 H01102 275 - 910 3.70
1-3/4 KPS-0308 H01304 224 - 876 4.20
2 KPS-0308 H02000 199 - 851 4.65
12 KPS-0308 H12000 * - - 23.10
1″ Very High Press. 1″ KPS-0308 V01000 575 1501 - 2.85
1-1/4 KPS-0308 V01104 475 1265 - 3.60
1-1/2 KPS-0308 V01102 389 1108 - 3.90
1-3/4 KPS-0308 V01304 325 998 - 4.45
2 KPS-0308 V02000 286 912 - 4.95
12 KPS-0308 V12000 * - - 24.70
1-1/8″ Ultra High Press. 1″ KPS-0308 U01000 800 2071 - 3.05
1-1/4 KPS-0308 U01104 593 1729 - 3.80
1-1/2 KPS-0308 U01102 522 1501 - 4.10
1-3/4 KPS-0308 U01304 450 1338 - 4.75
2 KPS-0308 U02000 387 1215 - 5.25
12 KPS-0308 U12000 * - - 26.50
Fits Punch Body Diam. O.D. Lgth. Order No. Lb. Per 1/8″ Def. Lb. Per 3/8″ Def. Lb. Per 1/2″ Def. Price
1/2″ 1″ High Press. 1″ KPS-0102 H01000 512 - 1143 $2.65
1-1/4 KPS-0102 H01104 340 - 1025 3.05
1-1/2 KPS-0102 H01102 325 - 946 3.50
1-3/4 KPS-0102 H01304 275 - 878 4.00
2 KPS-0102 H02000 250 - 834 4.35
24 KPS-0102 H24000 * - - 38.85
1-1/8″ Very High Press. 1″ KPS-0102 V01000 681 1709 - 2.85
1-1/4 KPS-0102 V01104 525 1475 - 3.40
1-1/2 KPS-0102 V01102 424 1318 - 3.80
1-3/4 KPS-0102 V01304 350 1207 - 4.45
2 KPS-0102 V02000 320 1123 - 4.65
24 KPS-0102 V24000 * - - 43.40
1-1/4″ Ultra High Press. 1″ KPS-0102 U01000 863 2188 - 3.05
1-1/4 KPS-0102 U01104 675 1793 - 3.60
1-1/2 KPS-0102 U01102 550 1529 - 4.10
1-3/4 KPS-0102 U01304 492 1341 - 4.75
2 KPS-0102 U02000 450 1200 - 5.05
24 KPS-0102 U24000 * - - 48.30
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-0508 H01000 562 - 1224 2.85
1-1/4 KPS-0508 H01104 446 - 1169 3.40
1-1/2 KPS-0508 H01102 375 - 1133 3.80
1-3/4 KPS-0508 H01304 323 - 1107 4.45
2 KPS-0508 H02000 295 - 1087 4.75
24 KPS-0508 H24000 * - - 43.60
1-1/4″ Very High Press. 1″ KPS-0508 V01000 794 1855 - 3.05
1-1/4 KPS-0508 V01104 600 1624 - 3.60
1-1/2 KPS-0508 V01102 510 1310 - 4.10
1-3/4 KPS-0508 V01304 424 1232 - 4.85
2 KPS-0508 V02000 384 1185 - 5.15
24 KPS-0508 V24000 * - - 48.65
1-3/8″ Ultra High Press. 1″ KPS-0508 U01000 975 2462 - 3.30
1-1/4 KPS-0508 U01104 775 2129 - 3.90
1-1/2 KPS-0508 U01102 640 1907 - 4.45
1-3/4 KPS-0508 U01304 546 1749 - 5.25
2 KPS-0508 U02000 489 1630 - 5.60
24 KPS-0508 U24000 * - - 54.10
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-0304 H01104 747 - 1725 $3.90
1-1/2 KPS-0304 H01102 642 - 1623 4.45
1-3/4 KPS-0304H01304 554 - 1550 5.15
2 KPS-0304 H02000 479 - 1495 5.60
2-1/4 KPS-0304H02104 417 - 1452 6.40
2-1/2″ KPS-0304 H02102 380 - 1418 7.05
24 KPS-0304 H24000 * - - 53.90
1-1/2″ Very High Press. 1-1/4″ KPS-0304 V01104 975 2390 - 4.20
1-1/2 KPS-0304 V01102 810 2105 - 4.85
1-3/4 KPS-0304 V01304 688 1902 - 5.70
2 KPS-0304 V02000 591 1749 - 6.10
2-1/4 KPS-0304 V02104 529 1631 - 7.05
2-1/2 KPS-0304 V02102 475 1536 - 7.70
2-3/4 KPS-0304 V02304 418 1458 - 8.55
24 KPS-0304V24000 * - - 59.85
1-3/4″ Ultra High Press. 1-1/4″ KPS-0304 U01104 1400 3382 - 4.95
1-1/2 KPS-0304 U01102 1200 3191 - 5.70
1-3/4 KPS-0304 U01304 1015 2841 - 6.75
2 KPS-0304U02000 896 2578 - 7.15
2-1/4 KPS-0304 U02104 796 2373 - 8.40
2-1/2 KPS-0304 U02102 707 2210 - 9.25
2-3/4 KPS-0304 U02304 551 2076 - 10.30
24 KPS-0304 U24000 * - - 73.60
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-0708 H01102 855 - 2363 4.55
1-3/4 KPS-0708 H01304 780 - 2213 5.40
2 KPS-0708 H02000 745 - 2141 5.70
2-1/4 KPS-0708 H02104 700 - 2072 6.75
2-1/2 KPS-0708 H02102 670 - 1846 7.35
2-3/4 KPS-0708 H02304 610 - 1741 7.60
3 KPS-0708 H03000 560 - 1720 8.20
24 KPS-0708 H24000 * - - 59.15
1-3/4″ Very High Press. 1-1/2″ KPS-0708V01102 1045 3202 - 4.95
1-3/4 KPS-0708 V01304 955 2780 - 5.90
2 KPS-0708 V02000 910 2464 - 6.30
2-1/4 KPS-0708 V02104 855 2218 - 7.35
2-1/2 KPS-0708 V02102 820 2021 - 8.10
2-3/4 KPS-0708 V02304 750 1880 - 8.30
3 KPS-0708 V03000 675 1726 - 9.05
24 KPS-0708 V24000 * - - 65.55
2″ Ultra High Press. 1-1/2″ KPS-0708 U01102 1475 4079 - 5.80
1-3/4 KPS-0708 U01304 1345 3830 - 6.95
2 KPS-0708U02000 1285 3294 - 7.50
2-1/4 KPS-0708 U02104 1205 3032 - 8.75
2-1/2 KPS-0708 U02102 1155 2823 - 9.70
2-3/4 KPS-0708 U02304 1055 2652 - 10.00
3 KPS-0708 U03000 955 2508 - 10.75
24 KPS-0708U24000 * - - 79.70
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-1000 H01104 1137 - 2782 $4.45
1-1/2 KPS-1000 H01102 940 - 2588 5.05
1-3/4 KPS-1000 H01304 788 - 2450 6.00
2 KPS-1000 H02000 689 - 2346 6.45
2-1/4 KPS-1000 H02104 616 - 2265 7.50
2-1/2 KPS-1000 H02102 548 - 2201 8.20
2-3/4 KPS-1000 H02304 505 - 2148 9.15
24 KPS-1000 H24000 * - - 64.30
2″ Very High Press. 1-1/4″ KPS-1000 V01104 1550 4111 - 5.15
1-1/2 KPS-1000 V01102 1200 3330 - 6.00
1-3/4 KPS-1000V01304 971 2911 - 7.15
2 KPS-1000 V02000 854 2624 - 7.60
2-1/4 KPS-1000 V02104 770 2367 - 8.95
2-1/2 KPS-1000 V02102 700 2262 - 9.80
2-3/4 KPS-1000 V02304 636 2121 - 10.10
3 KPS-1000 V03000 569 1985 - 10.95
4 KPS-1000 V04000 423 1963 - 14.20
24 KPS-1000 V24000 * - - 78.55
2-1/2″ Ultra High Press. 1-1/4″ KPS-1000 U01104 2593 - - 6.95
1-1/2 KPS-1000 U01102 2136 4582 - 8.10
1-3/4 KPS-1000 U01304 1796 4129 - 9.70
2 KPS-1000 U02000 1524 3790 - 10.40
2-1/4 KPS-1000 U02104 1316 3525 - 12.30
2-1/2 KPS-1000 U02102 1212 3314 - 13.55
2-3/4 KPS-1000 U02304 1106 3061 - 14.00
3 KPS-1000 U03000 996 2851 - 15.15
4 KPS-1000 U04000 734 2272 - 19.85
24 KPS-1000 U24000 * - - 112.60
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-1104 H02000 1860 - - 10.95
2-1/4 KPS-1104 H02104 1750 - - 12.95
2-1/2 KPS-1104 H02102 1675 - - 14.20
2-3/4 KPS-1104 H02340 1530 - - 14.60
3 KPS-1104 H03000 1380 - - 15.90
24 KPS-1104 H24000 * - - 118.25
Fits Punch Body Diam. O.D. Lgth. Order 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″ KPS-1102 H02000 2105 - - 11.70
2-1/4 KPS-1102 H02104 1980 - - 13.90
2-1/2 KPS-1102 H02102 1900 - - 15.25
2-3/4 KPS-1102 H02304 1730 - - 15.75
3 KPS-1102 H03000 1565 - - 17.05
24 KPS-1102 H24000 * - - 127.70

View Additional Tubes/Spring Sizes

tubes-spring-caps

Caps

  • Grade – K-750D, very tough, hard urethane
  • Can be drilled, pierced or machined to fit the punch for positive stripping while dampening vibration
  • Will not mar prefinished stocks
  • I.D. – Press fit to spring
  • Use vise or arbor press to assemble caps and springs

caps

Cap O.D. Cap I.D. Order No. Price
1″ 3/4″ KPC-1000 $4.20
1-1⁄8 7/8 KPC-1108 4.65
1-1⁄4 1 KPC-1104 4.75
1-3⁄8 1-1⁄8 KPC-1308 4.95
1-1⁄2 1-1⁄4 KPC-1102 5.60
1-5⁄8 1-3⁄8 KPC-1508 5.90
1-3⁄4 1-1⁄2 KPC-1304 6.60
2-1⁄8 1-3⁄4 KPC-2108 7.35
2-3⁄8 2 KPC-2308 8.20
2-7⁄8 2-1⁄2 KPC-2708 9.90