The Charles Bond Company stock line of spur gears are made from either high grade steel or Class 40 Cast Iron.   Of course we can make Special Gears out of Brass, Bronze or any type of Plastic or Phenolic material.   Also, it should be noted that our stock gears are based on the recommendations of the American Gear Manufacturers Association (AGMA)   which are Diametral Pitch Gears.   We are seeing more and more Module (Metric) Pitch Gears in the market place and have many of the cutters required to manufacture this type of gearing.      

Identification/Numbering System Example and Explanation:

(a) The first letter in the symbol indicates the Material - (R) = Cast Iron; (S) = Steel; (B) = Bronze or Brass

(b) The number after the first letter indicates the Pitch - 3, 4, 5, 6, 8, 10, 12, 16, 20 or 24

(c) The next letter (for Spur Gears an S) indicates the Type of Gear

(d) The next letter, if applicable would be a (U) which indicates a Hub on the gear.   There is no letter if it is hubless.

(e) The last number is the Number of Teeth.

(f) If there is a letter (generally an N or an A) after the Number of Teeth, this indicates there was a change at some point, generally the bore or possibly the hub dimensions.

Therefore, our Part Number S12SU22N is a Steel, 12 Diametral Pitch, Spur Gear, with a Hub, 22 Teeth and a change was made (in this particular case the bore was changed from 1/2" to 5/8" Stock Bore)