Rigid Couplings

Manufactured in SAE 1008 mild steel, the ReliaMark line of rigid couplings includes set-screw, one-piece (single-split) and two-piece (double-split) couplings, all with a black oxide finish and socket head cap screws. ReliaMark couplings are available off the shelf in the most common sizes, ranging in bore or shaft diameter from 1/4″ to 1 1/2″.

ReliaMark Rigid Couplings

For pricing & availability, please click a part number.

No Keyway Keyway Bore Size Outer Diameter Width Set Screw Weight (lbs) Bore Tolerance
2CC2525RM 1/4 x 1/4 11/16 1 1/8 4-40 x 3/8 0.141 +.001 / .003
2CC3737RM 2CC3737KRM 3/8 x 3/8 7/8 1 3/8 6-32 x 3/8 0.310 +.001 / .003
2CC5050RM 2CC5050KRM 1/2 x 1/2 1 1/8 1 3/4 8-32 x 1/2 0.493 +.001 / .003
2CC6262RM 2CC6262KRM 5/8 x 5/8 1 5/16 2 10-32 x 1/2 1.406 +.001 / .003
2CC7575RM 2CC7575KRM 3/4 x 3/4 1 1/2 2 1/4 1/4-28 x 5/8 1.306 +.001 / .003
2CC8787RM 2CC8787KRM 7/8 x 7/8 1 5/8 2 1/2 1/4-28 x 5/8 0.963 +.001 / .003
2CC100100RM 2CC100100KRM 1 x 1 1 3/4 3 1/4-28 x 5/8 1.475 +.001 / .003
2CC112112RM 2CC112112KRM 1 1/8 x 1 1/8 1 7/8 3 1/8 1/4-28 x 3/4 2.063 +.001 / .003
2CC125125RM 2CC125125KRM 1 1/4 x 1 1/4 2 1/16 3 1/4 1/4-28 x 3/4 1.775 +.001 / .003
2CC137137RM 2CC137137KRM 1 3/8 x 1 3/8 2 1/2 3 5/8 5/16-24 x 1 2.313 +.001 / .003
2CC150150RM 2CC150150KRM 1 1/2 x 1 1/2 2 5/8 3 7/8 5/16-24 x 1 3.094 +.001 / .003

For pricing & availability, please click a part number.

No Keyway Keyway Bore Size Outer Diameter Width Set Screw Weight (lbs) Bore Tolerance
RC25RM 1/4 1/2 3/4 10-32 x 1/8 0.081 +.001 / .003
RC31RM 5/16 5/8 1 10-32 x 1/8 0.019 +.001 / .003
RC37RM 3/8 3/4 1 1/4-20 x 3/16 0.088 +.001 / .003
RC50RM RC50KRM 1/2 1 1 1/2 1/4-20 x 1/4 0.238 +.001 / .003
RC62RM RC62KRM 5/8 1 1/4 2 5/16-18 x 5/16 0.500 +.001 / .003
RC75RM RC75KRM 3/4 1 1/2 2 5/16-18 x 3/8 0.725 +.001 / .003
RC87RM RC87KRM 7/8 1 3/4 2 5/16-18 x 5/16 0.181 +.001 / .003
RC100RM RC100KRM 1 2 3 5/16-18 x 1/2 2.000 +.001 / .003
RC112RM RC112KRM 1 1/8 2 1/8 3 3/8-16 x 1/2 2.500 +.001 / .003
RC125RM RC125KRM 1 1/4 2 1/4 4 3/8-16 x 1/2 3.019 +.001 / .003
RC137RM RC137KRM 1 3/8 2 1/2 4 1/2 3/8-16 x 1/2 3.438 +.001 / .003
RC150RM RC150KRM 1 1/2 2 1/2 4 1/2 3/8-16 x 1/2 3.125 +.001 / .003

For pricing & availability, please click a part number.

No Keyway Keyway Bore Size Outer Diameter Width Set Screw Weight (lbs) Bore Tolerance
CC2525RM 1/4 x 1/4 11/16 1 1/8 4-40 x 3/8 0.141 +.001 / .003
CC3737RM CC3737KRM 3/8 x 3/8 7/8 1 3/8 6-32 x 3/8 0.310 +.001 / .003
CC5050RM CC5050KRM 1/2 x 1/2 1 1/8 1 3/4 8-32 x 1/2 0.481 +.001 / .003
CC6262RM CC6262KRM 5/8 x 5/8 1 5/16 2 10-32 x 1/2 0.831 +.001 / .003
CC7575RM CC7575KRM 3/4 x 3/4 1 1/2 2 1/4 1/4-28 x 5/8 1.306 +.001 / .003
CC8787RM CC8787KRM 7/8 x 7/8 1 5/8 2 1/2 1/4-28 x 5/8 1.588 +.001 / .003
CC100100RM CC100100KRM 1 x 1 1 3/4 3 1/4-28 x 5/8 1.813 +.001 / .003
CC112112RM CC112112KRM 1 1/8 x 1 1/8 1 7/8 3 1/8 1/4-28 x 3/4 1.375 +.001 / .003
CC125125RM CC125125KRM 1 1/4 x 1 1/4 2 1/16 3 1/4 1/4-28 x 3/4 1.775 +.001 / .003
CC137137RM CC137137KRM 1 3/8 x 1 3/8 2 1/2 3 5/8 1/4-28 x 34 2.313 +.001 / .003
CC150150RM CC150150KRM 1 1/2 x 1 1/2 2 5/8 3 7/8 1/4-28 3.094 +.001 / .003