Lowell Corporation Mechanical Ratchet Clutches, Model 72

Rugged and reliable for heavy-duty applications
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 hefty 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.

  • Mounting holes provided in body
  • Keyways are per ANSI/ASME B17.1
  • Lubrication is recommended after every 1200 hours of operation
  • Specials may be ordered with size, shape, and tooth arrangements of your choice
  • Fully locked neutral position
  • Free running neutral position available on request
  • Durable, cast iron construction
  • Custom models available
  • 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 72 Ratchet Clutch - Square Opening
1/2" Sq72901-9220816300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard1-2-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Square Opening
9/16" Sq72901-9220916300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard9-16-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Square Opening
5/8" Sq72901-9221016300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard5-8-sq-216300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Square Opening
11/16" Sq72901-9221116300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard11-16-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Square Opening
3/4" Sq72901-9221216300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard3-4-sq-216300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Square Opening
13 mm Sq72901-M221316300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric13-mm-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Square Opening
14 mm Sq72901-M221416300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric14-mm-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Square Opening
16 mm Sq72901-M221616300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric16-mm-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Square Opening
17 mm Sq72901-M221716300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric17-mm-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Square Opening
19 mm Sq72901-M221916300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric19-mm-sq16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Hex Opening
11/16" Hex72901-9231116300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard11-16-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Hex Opening
3/4" Hex72901-9231216300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard3-4-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Hex Opening
7/8" Hex72901-9231416300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard7-8-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Hex Opening
1" Hex72901-9231616300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard1-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Hex Opening
17 mm Hex72901-M231716300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric17-mm-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Hex Opening
19 mm Hex72901-M231916300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric19-mm-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Hex Opening
22 mm Hex72901-M232216300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric22-mm-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Hex Opening
24 mm Hex72901-M232416300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric24-mm-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Hex Opening
25 mm Hex72901-M232516300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric25-mm-hex16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Bore Opening
1/2" Bore72901-9210816300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard1-2-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Bore Opening
5/8" Bore72901-9211016300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard5-8-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Bore Opening
3/4" Bore72901-9211216300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard3-4-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Bore Opening
1" Bore72901-9211616300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Standard1-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64standard
Model 72 Ratchet Clutch - Bore Opening
13 mm Bore72901-M211316300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric13-mm-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Bore Opening
16 mm Bore72901-M211616300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric16-mm-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Bore Opening
19 mm Bore72901-M211916300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric19-mm-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric
Model 72 Ratchet Clutch - Bore Opening
25 mm Bore72901-M212516300 lb-ft100 rpmCast Iron, Steel3-1/4"2-7/8"1-3/16"1-7/8"1-1/16"2-5/8"1-1/8"2-1/4"19/64"Metric25-mm-bore16300-lb-ft100-rpmcast-iron steel3-1-42-7-81-3-161-7-81-1-162-5-81-1-82-1-419-64metric