Alloy Steel Single Joints

  • Solid hubs in 14 sizes. Joints 7/8″ and larger have Curtis’ Take-Apart feature.
  • Features 4140-grade steel for all forks. Forks of 7⁄8 inch diameter and larger have induction-hardened bearing areas for strength and durability.
  • Center blocks and pins are machined from 8620 alloy steel and are carburized and case hardened to generate superior wear characteristics.
  • Universal joint hub modifications are available, including bores, keyways, set screw holes, cross pin holes, squares, hexes and splines.
Alloy Steel Single Joints

Resources

Curtis Universal Joint Catalog (pdf)

About the Take-Apart Joint

Turn Key/Ready-To-Use Joints

When you need a complete joint, use one of our Turn Key/Ready-To-Use Joints. Everything you need all ready to go. Simply choose your size, and you’ll get everything you need.

  • Complete line of standard bored joints outfitted with standard keyways and set screws already installed.
  • In alloy steel, we have all standard sizes available in stock, ranging from 3/8″ to 4″ O.D. with standard bores (one-half of the O.D.), keyways and installed set screws.
  • The 3/8″ and 1/2″ joints come with set screws only, while other standard O.D. sizes include keyways
  • Joints 7/8″ or larger have Curtis’ simple Take Apart feature to allow for more specialized modification
Turnkey

Alloy Steel Single Joint Additional Resources

To assure our customers of prompt service, Curtis stocks standard alloy steel u-joints with solid hubs in 14 sizes. Joints 78” and larger have Curtis’ Take-Apart feature which allows for specialized modifications with no special tooling required. This feature makes it easy for the end user to disassemble the joint, machine component parts and reassemble without damaging the hubs, pins or center block.

Curtis Alloy Steel Joints feature 4140-grade steel for all forks. Forks of 78 inch diameter and larger have induction-hardened bearing areas for strength and durability. The body (hubs) of the joints remain in an annealed state, which affords free machinability. Center blocks and pins are machined from 8620 alloy steel and are carburized and case hardened to generate superior wear characteristics yet remain ductile, thereby enabling the joint to handle shock loads without experiencing premature failure. Universal joint hub modifications are available per customer specifications, which include but not limited to bores, keyways, set screw holes, cross pin holes, squares, hexes and splines. For assistance in ordering your universal joints, please refer to Curtis’ how to order instructions or contact the Curtis sales department for more information.

Universal Applications

  • Stock Car Racers
  • Nuclear Installations
  • Tractor Attachments
  • In-Plant Utility Vehicles
  • Grain Augers

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.

Model

Outside Diameter

Total Length

Centerline to End

Static Torque Rating (in lb.)

A

C

C/2

CJ641

0.375

1.750

0.875

140

CJ642

0.500

2.000

1.000

425

CJ643

0.625

2.250

1.125

900

CJ644

0.750

2.688

1.344

1610

CJ645

0.875

3.000

1.500

1800

CJ646

1.000

3.375

1.688

3050

CJ647

1.125

3.500

1.750

3500

CJ648

1.250

3.750

1.875

5500

CJ650

1.500

4.250

2.125

9000

CJ651

1.750

5.000

2.500

14000

CJ652

2.000

5.438

2.719

22000

CJ653

2.500

7.000

3.500

32000

CJ654

3.000

9.000

4.500

55000

Cj655

4.000

10.625

5.313

131000