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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.
Dalton Model "OSDC" Overload Safety Device
Dalton Model "OSDC" Overload Safety Device - Dimensional Drawing
Unit of Measure
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Item #

Maximum Torque

OSD Half

Coupling Half

D - Overall Length

List Price

OSDC-750D-1 3/4x2 11/16 N/A 775 lbs107 mkp N/A 1 3/4 Inch44 mm N/A 2 11/16 Inch68.3 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-1 15/16x1 N/A 775 lbs107 mkp N/A 1 15/16 Inch49 mm N/A 1 Inch25 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-1 15/16x1 1/4 N/A 775 lbs107 mkp N/A 1 15/16 Inch49 mm N/A 1 1/4 Inch31.8 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-1 15/16x2 3/16 N/A 775 lbs107 mkp N/A 1 15/16 Inch49 mm N/A 2 3/16 Inch55.6 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-1 15/16x2 7/16 N/A 775 lbs107 mkp N/A 1 15/16 Inch49 mm N/A 2 7/16 Inch62 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-1 15/16x2 11/16 N/A 775 lbs107 mkp N/A 1 15/16 Inch49 mm N/A 2 11/16 Inch68.3 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-2x1 N/A 775 lbs107 mkp N/A 2 Inch50.8 mm N/A 1 Inch25 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-2x1 1/4 N/A 775 lbs107 mkp N/A 2 Inch50.8 mm N/A 1 1/4 Inch31.8 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-2x2 3/16 N/A 775 lbs107 mkp N/A 2 Inch50.8 mm N/A 2 3/16 Inch55.6 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-2x2 7/16 N/A 775 lbs107 mkp N/A 2 Inch50.8 mm N/A 2 7/16 Inch62 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-750D-2x2 11/16 N/A 775 lbs107 mkp N/A 2 Inch50.8 mm N/A 2 11/16 Inch68.3 mm N/A 5 29/32 Inch150 mm $912.00
OSDC-900-1 1/4x1 1/4 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 1 1/4 Inch31.8 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x1 1/2 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 1 1/2 Inch38.1 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x1 3/4 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 1 3/4 Inch44 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x2 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 2 Inch50.8 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x2 1/2 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 2 1/2 Inch64 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x3 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 3 Inch76.2 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 1/4x3 1/2 N/A 1000 lbs139 mkp N/A 1 1/4 Inch31.8 mm N/A 3 1/2 Inch90 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x1 1/4 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 1 1/4 Inch31.8 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x1 1/2 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 1 1/2 Inch38.1 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x1 3/4 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 1 3/4 Inch44 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x2 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 2 Inch50.8 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x2 1/2 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 2 1/2 Inch64 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x3 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 3 Inch76.2 mm N/A 7 1/4 Inch184 mm $1,520.00
OSDC-900-1 3/4x3 1/2 N/A 1000 lbs139 mkp N/A 1 3/4 Inch44 mm N/A 3 1/2 Inch90 mm N/A 7 1/4 Inch184 mm $1,520.00
Unit of Measure
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