Lowell Corporation Mechanical Ratchet Clutches, Model 74

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 74 Ratchet Clutch - Square Gear Opening
3/4" Sq74901-9421220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard3-4-sq-220800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
7/8" Sq74901-9421420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard7-8-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1" Sq74901-9421620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-1/16" Sq74901-9421720800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-16-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-1/8" Sq74901-9421820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-8-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-3/16" Sq74901-9421920800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-16-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-1/4" Sq74901-9422020800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-4-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-3/8" Sq74901-9422220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-8-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-7/16" Sq74901-9422320800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-7-16-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
1-1/2" Sq74901-9422420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-2-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Square Gear Opening
19 mm Sq74901-M421920800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric19-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
22 mm Sq74901-M422220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric22-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
25 mm Sq74901-M422520800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric25-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
27 mm Sq74901-M422720800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric27-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
28 mm Sq74901-M422820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric28-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
30 mm Sq74901-M423020800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric30-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
32 mm Sq74901-M423220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric32-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
34 mm Sq74901-M423420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric34-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
36 mm Sq74901-M423620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric36-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Square Gear Opening
38 mm Sq74901-M423820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric38-mm-sq20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
7/8" Hex74901-9431420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard7-8-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1" Hex74901-9431620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-1/16" Hex74901-9431720800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-16-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-1/8" Hex74901-9431820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-8-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-1/4" Hex74901-9432020800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-4-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-3/8" Hex74901-9432220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-8-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-7/16" Hex74901-9432320800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-7-16-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-1/2" Hex74901-9432420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-2-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-5/8" Hex74901-9432620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-5-8-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-3/4" Hex74901-9432820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-4-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
1-13/16" Hex74901-9432920800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-13-16-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Hex Gear Opening
22 mm Hex74901-M432220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric22-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
25 mm Hex74901-M432520800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric25-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
27 mm Hex74901-M432720800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric27-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
28 mm Hex74901-M432820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric28-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
30 mm Hex74901-M433020800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric30-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
32 mm Hex74901-M433220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric32-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
34 mm Hex74901-M433420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric34-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
36 mm Hex74901-M433620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric36-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
38 mm Hex74901-M433820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric38-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
41 mm Hex74901-M434120800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric41-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
42 mm Hex74901-M434220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric42-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Hex Gear Opening
46 mm Hex74901-M434620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric46-mm-hex20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
3/4" Bore74901-9411220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard3-4-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
1" Bore74901-9411620800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
1-1/4" Bore74901-9412020800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-4-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
1-3/8" Bore74901-9412220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-8-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
1-1/2" Bore74901-9412420800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-1-2-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
1-3/4" Bore74901-9412820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Standard1-3-4-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64standard
Model 74 Ratchet Clutch - Bore Gear Opening
19 mm Bore74901-M411920800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric19-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
25 mm Bore74901-M412520800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric25-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
32 mm Bore74901-M413220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric32-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
34 mm Bore74901-M414320800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric34-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
38 mm Bore74901-M413820800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric38-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric
Model 74 Ratchet Clutch - Bore Gear Opening
42 mm Bore74901-M414220800 lb-ft75 rpmCast Iron, Steel5-1/8"3-7/8"1-7/16"3-1/8"1-1/2"4-1/8"1-7/16"2-7/8"25/64"Metric42-mm-bore20800-lb-ft75-rpmcast-iron steel5-1-83-7-81-7-163-1-81-1-24-1-81-7-162-7-825-64metric