The Dalton OSDC (Overload Safety Device Coupling) provides overload protection through the use of an OSD unit combined with a roller chain coupling half counterbored to fit the OSD flange. Standard double-width roller chain is used to couple the basic OSD unit and the coupling half.

The OSDC can be set with a torque wrench for maximum load desired. The unit functions as a roller chain coupling until an overload occurs, causing the OSDC to disengage. The device is automatically re-engaged when the overload is eliminated.

FORMULA FOR TORQUE-HORSEPOWER (Foot Pounds)

TORQUE (Foot. Pounds) = (HPx5252)/RPM
HORSEPOWER = (Torque x RPM)/525

In furnishing a coupling half to be used in the "OSDC", care must be taken that a standard cut tooth sprocket is not used. The teeth of the "OSDC" coupling half are cut with a special tooth form to compensate for shaft misalignment.

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

For maximum bore on OSD225, OSD225D, 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

Maximum Torque

N/A 35 lbs5 mkp

No. of Springs

N/A 1

OSD Half

N/A 3/4 Inch19.1 mm

Coupling Half

N/A 1 1/8 Inch28 mm

Coupling Half No.

N/A 4020A

OSD Sprocket No.

N/A 40A20GC

Coupling Chain No.

N/A D40

For Bore Sizes Not Shown, Add Charge to List Price per Half

N/A $16.00

A - Diameter

N/A 3.656 Inch93 mm

B - Length

N/A 1 1/8 Inch29 mm

C - Length

N/A 2 Inch51 mm

D - Overall Length

N/A 2 29/32 Inch74 mm

E - Diameter

N/A 2 11/16 Inch68 mm

Weight

N/A 4 lbs1.80 kg