Ordering Information

Ramsey manufactures chain and sprockets to replace or interchange with silent chain products from most manufacturers. In order for chains and sprockets to be fully compatible they must have the same pitch, tooth profile, width, and guide link assembly. Also, silent chain from different manufacturers typically should not be interconnected. This can void product warranties and impair proper chain operation. We recommend that Ramsey be consulted when replacing chain or sprockets from other manufacturers.

When replacing other types of drives with silent chain it is best to base component selection on known drive conditions ie. speeds, load, lubrication method, and shock loading. Ramsey can review your selections or assist you with the product selection process.

In most cases, Ramsey uses a part numbering system that is similar to the method used in the silent chain standard, ANSI Standard B29.2. Chain part numbers begin with a prefix, such as SC, RP, or RPV, which identifies the product type. This is followed by a number that indicates the chain pitch in eighths of an inch. The two last digits indicate the width in fourths of an inch. An exception to this rule is made for 3/16″ pitch where the following convention applies: The first two digits in the code denote chain pitch in 16ths of an inch and the last two digits indicate width in 32nds of an inch.

For example: SC 408 identifies a Standard silent chain Chain which is 1/2″ pitch and 2″ wide. A sprocket to run with this chain would be identified by the chain product code followed by the number of teeth in the sprocket. For instance, SC 408-21 identifies a compatible 21 tooth sprocket. Special chains and replacements for other manufacturers may use a different numbering system.

If you know the chain’s catalog part number . . .
Simply supply the part number along with the chain length in pitches, feet or meters.

If you have a chain description, but do not know the part number . . .
Please specify the following details:

1. Product type – For example, RPV, RP, SC, Conveyor, Duplex or competitors product type.
2. Pitch – Best determined by measuring across 3 pin heads and dividing the measurement by 2.
3. Chain width across the links and across the pin heads
4. Guide type( side guide, center guide, or no guide)
5. Chain length in pitches, feet or meters

note: For conveying chains it is also important to specify either “single pin”
or “two pin” and “all link” or “link-spacer” construction.

If you have an engineering drawing . . .
Simply fax, email, or post mail the drawing to Ramsey.

If you are uncertain about what you need . . .
Contact Ramsey. An experienced customer service representative will assist you.

If you know your sprocket catalog part number . . .
Simply supply the part number along with the following details:

1. Hub type A, B, C or D
2. Hub projection
3. Bore diameter
4. Keyway size
5. Hub diameter

If you don’t know your sprocket catalog part number . . .
Please specify the pitch, number of teeth and chain width, along with the 5 items listed immediately above.

If you have an engineering drawing . . .
Simply fax, email, or mail the drawing to Ramsey. After a review of the drawing we will respond to your inquiry and supply a quotation if desired.

If you are uncertain about what you need . . .
Contact Ramsey. An experienced customer service representative will assist you.