Belt-winding core specifications

Standard Core

Outside Diameter	Square Inside Dimension	Safe Working Load (Based on Core Length)
5″	2.25″	45 lb/in
6″	3.25″	35 lb/in
7″	3.25″	60 lb/in
8″	4.25″	50 lb/in
10″	4.25″	100 lb/in
12″	6.25″	79 lb/in

Not sure? Try our standard belt-winding core sizing tool.

Paper-wound Core

Outside Diameter	Square Inside Dimension	Safe Working Load (Based on Core Length)
5.5″	2.25″	70 lb/in
6.5″	3.25″	57 lb/in
7.5″	3.25″	87 lb/in
10.5″	4.25″	135 lb/in

Staved Core

Outside Diameter	Square Inside Dimension	Safe Working Load (Based on Core Length)
8.5″	2.25″	156 lb/in
9.5″	4.25″	140 lb/in
11.5″	4.25″	220 lb/in
13.5″	6.25″	186 lb/in

Note: These are suggested safe working loads. It is strongly recommended that customers do further testing under their in-plant conditions to ensure optimal performance. The safe working loads shown above are not intended to account for winding bar induced torsional shock loads imposed by sudden acceleration or deceleration.

→ Download our Belt-Winding Core product sheet.

→ Download our Notched Core product sheet.

Don’t see the size you’re looking for? Our engineers can also custom design and manufacture cores to meet specific-use demands (e.g., round holes, variable lengths).

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