Many applications require corrosion resistant universal joints to assure sanitation or to avoid premature oxidation or deterioration. Curtis’ 303 grade stainless steel u-joints are particularly important, for example, to industries that use food processing equipment, and for machinery that comes in contact with corrosive chemicals or is exposed to water for long periods. Furnace applications also benefit from stainless steel, which better withstands high temperatures and other environmental extremes. Curtis stocks 303 stainless in all 14 sizes from 3⁄8″ to 4″. Stainless steel grades 304, 316 and others available by special order. Standard turn-key joints have standard bores, keyways (5⁄8″ joints and larger) and set screws already installed.
Universal Applications
- Tractor Steering
- Commercial Ovens
- Bowling Alley Cleaning
- Missile Containers
- Snow Blowers
Also available in alloy steel.
NOTE #1: Large bearing pin is provided with an oil passage. 1.00" through 4.00" diameter joints are also fitted with a ball spring oil fitting to retain lubricant.
NOTE #2: Curtis standard single universal joints will operate through angles of 35. For applications requiring greater angles, special design can be employed, enabling the joint to operate at angles up to 45.
| Catalog Number | Outside Diameter | Bore Diameter | Total Length | Centerline to End | Set Screw Size | Keyway Size | Static Torque Rating |
| Commercial Tolerance | Inch Pounds | ||||||
| A | B | C | C/2 | E | F | ||
| SS641B1SS | 0.375 | 0.1875 | 1.750 | 0.875 | 2-56 NC | ---- | 100 |
| SS642B1SS | 0.500 | 0.2500 | 2.000 | 1.000 | 4-40 NC | ---- | 375 |
| SS643BKW1SS | 0.625 | 0.3125 | 2.250 | 1.125 | 10-32 NF | 0.094 X 0.047 | 610 |
| SS644BKW1SS | 0.750 | 0.3750 | 2.688 | 1.344 | 10-32 NF | 0.094 X 0.047 | 1000 |
| SS645BKW1SS | 0.875 | 0.4375 | 3.000 | 1.500 | 10-32 NF | 0.094 X 0.047 | 1350 |
| SS646BKW1SS | 1.000 | 0.5000 | 3.375 | 1.688 | 1/4-20 NC | 0.125 X 0.063 | 1900 |
| SS647BKW1SS | 1.125 | 0.5625 | 3.500 | 1.750 | 1/4-20 NC | 0.125 X 0.063 | 2200 |
| SS648BKW1SS | 1.250 | 0.6250 | 3.750 | 1.875 | 5/16-18 NC | 0.188 X 0.094 | 3600 |
| SS650BKW1SS | 1.500 | 0.7500 | 4.250 | 2.125 | 5/16-18 NC | 0.188 X 0.094 | 7200 |
| SS651BKW1SS | 1.750 | 0.8750 | 5.000 | 2.500 | 5/16-18 NC | 0.188 X 0.094 | 10700 |
| SS652BKW1SS | 2.000 | 1.0000 | 5.438 | 2.719 | 3/8-16 NC | 0.250 X 0.125 | 15500 |
| SS653BKW1SS | 2.500 | 1.2500 | 7.000 | 3.500 | 3/8-16 NC | 0.250 X 0.125 | 21000 |
| SS654BKW1SS | 3.000 | 1.5000 | 9.000 | 4.500 | 1/2-13 NC | 0.375 X 0.188 | 34000 |
| SS655BKW1SS | 4.000 | 2.0000 | 10.625 | 5.313 | 1/2-13 NC | 0.500 X 0.250 | 81000 |