The Dalton "OSD" is a torque-limiter unit which prevents costly breakdowns when equipment is overloaded, by disengaging when a set maximum load is reached. The unit is re-engaged immediately when the overload is eliminated. The "OSD" is easily adjusted with a torque-wrench to the specific torque required. It can be used with a sprocket, gear, belt-pully, or flange.The clutch facings used, have been selected after research and testing, to resist expansion due to moisture. The flanges are high carbon steel forgings, machined accurately for precise operation. The threaded hub and pressure plate are machined square and ground where necessary to position the plate and eliminate extra parts. The torque adjusting nut is hexagonal for easier installation and adjustment. Equipped with needle bearings to eliminate shaft scoring, seizing, and wear. Use only specially ground sprockets.

The Dalton "OSD", Overload Safety Device Unit, is equipped with a single torque adjusting nut for torque uniformity. Only one setting on the single e nut applies equal pressure on the entire unit, whereas the use of multiple e nuts would make it extremely difficult to equalize the pressure and would defeat the purpose of a positive release. A standard pipe wrench, which is readily available everywhere, may also be used to adjust this nut.

Fibers are 1/8" thick.


TORQUE (Foot. Pounds) = (HPx5252)/RPM
HORSEPOWER = (Torque x RPM)/5252

Important Notes:
The "OSD" overload safety device can be made to suit your application. Send us your blueprints or specifications, for recommendations by our engineering department.

Dalton Overload Safety Devices can be plated with cadmium, chrome and zinc.
Sprockets can be furnished in ferrous materials.

For maximum bore on OSD225, 225D, a shallow keyway Is used of 1/2 standard depth. Use the next larger size "OSD" unit when a standard keyway is desired.
Unit of Measure

Help Desk

N/A For Problems Accessing a CAD Model Please Contact
Telephone: 1-800-451-4231

Maximum Torque

N/A 35 lbs5 mkp

No. of Springs

N/A 1

Bore Size

N/A 3/8 Inch9.6 mm

A - Flange O.D.

N/A 2 1/4 Inch57 mm

B - O.D. of Bearing and Sprocket Bore

N/A 1 1/4 Inch31.7 mm

C - Thickness of Flange

N/A 3/8 Inch10 mm

D - Minimum Width Between Fibers

N/A 1/16 Inch1.5 mm

D1 - Maximum Width for Sprocket or Pulley

N/A 1/2 Inch13 mm


N/A 7/16 Inch11 mm

E - Overall Length

N/A 2 Inch51 mm

Torrington Bearing No.

N/A B-168

F - Minimum Bore

N/A 3/8 Inch9.6 mm

G - Maximum Bore

N/A 3/4 Inch19 mm


N/A 1 lbs.45 kg

Min. Plain Bore Price

N/A $60.00

List Price

N/A $72.00

For Bore Sizes Not Shown, Add Charge to List Price

N/A $16.00