Lowell Corporation Mechanical Ratchet Clutches, Model 701

Low cost and weight with high performance
Lowell ratchet clutches are designed from standard bodies, gears, pawls, and springs. Forces are applied in an optimum manner between the solid steel gear and pawl so that loads are in compression rather than in shear. Gears are a low-carbon steel. Rugged tooth design as large contact area with pawl.

  • Fingertip control of motion: one way clockwise and one way counter-clockwise
  • Control lever can be connected to hydraulic, pneumatic, or electric actuators for remote shifting
  • Simple design ensures durability and reduces purchase and operating costs
  • High drive torque-to-weight ratio
  • Maximum driving efficiency
  • Minimal overrunning torque
  • Versatile mounting options
  • Standard gear openings available in hex, square, and bore and keyway (per ANSI/ASME B17.1)
  • Can be used individually or in combination
  • Open-sided for easy, minimal maintenance
  • Alignment is not critical
  • 100% made in USA
ImageOpeningPart NumberGear TeethMax TorqueOverrunning SpeedMaterialABCDEFGHJMeasurement Systemhf:att:pa_socket-openinghf:att:pa_gear-teethhf:att:pa_max-torquehf:att:pa_overrunning-speedhf:att:pa_materialhf:att:pa_ahf:att:pa_bhf:att:pa_chf:att:pa_dhf:att:pa_ehf:att:pa_fhf:att:pa_ghf:att:pa_hhf:att:pa_jhf:att:pa_measurement-system
Model 701 Ratchet Clutch with Square Opening
3/8" Sq70100-829361685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard3-8-sq1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Square Opening
1/2" Sq70100-829371685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard1-2-sq1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Square Opening
5/8" Sq70100-829381685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard5-8-sq-21685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Square Opening
10 mm Sq70100-M92101685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric10-mm-sq1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Square Opening
13 mm Sq70100-M92131685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric13-mm-sq1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Square Opening
16 mm Sq70100-M92161685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric16-mm-sq1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
7/16" Hex70100-829571685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard7-16-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Hex Opening
1/2" Hex70100-829581685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard1-2-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Hex Opening
9/16" Hex70100-829591685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard9-16-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Hex Opening
5/8" Hex70100-829601685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard5-8-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Hex Opening
3/4" Hex70100-829611685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard3-4-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Hex Opening
11 mm Hex70100-M93111685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric11-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
13 mm Hex70100-M93131685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric13-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
14 mm Hex70100-M93141685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric14-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
16 mm Hex70100-M93161685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric16-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
17 mm Hex70100-M93171685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric17-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Hex Opening
19 mm Hex70100-M93191685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric19-mm-hex1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Bore Opening
1/2" Bore70100-829781685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard1-2-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Bore Opening
5/8" Bore70100-829801685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard5-8-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Bore Opening
3/4" Bore70100-829821685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Standard3-4-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16standard
Model 701 Ratchet Clutch with Bore Opening
13 mm Bore70100-M91131685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric13-mm-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Bore Opening
16 mm Bore70100-M91161685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric16-mm-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric
Model 701 Ratchet Clutch with Bore Opening
19 mm Bore70100-M91191685 lb-ft250 rpmFabricated Steel4"1-5/8"21/32"2-7/16"1-21/64"3-1/2"9/16"1-1/8"3/16"Metric19-mm-bore1685-lb-ft250-rpmfabricated-steel41-5-821-322-7-161-21-643-1-29-161-1-83-16metric