Apple o-rings and MicrOring™ seals are specified by three characteristics: size, hardness, and material. Prior to seal specification, please check for availability. We add to our tooling list all the time.

Size: Standards are specified by their AS568 or ISO 3601 dash number. Non-standards are referenced by I.D. and C.S. (cross section). Although we only include the AS568 standard sizes in this guide, Apple has a vast inventory of non-standard and metric sizes. And, if you still don't find the size you are looking for, please keep in mind that Apple provides complete customized work to meet your special needs.

Hardness: This is specified by a two-digit Shore A durometer number, ranging from 20 (soft) to 90 (hard), depending on the type of elastomer. Our standard durometer is 70 Shore A, except for Viton™ which is 75 Shore A. Standard durometer tolerance is ±5.

Material: Our standard range of materials is designated by a two-letter abbreviation for each elastomer. See the Material Selection Guide for designations and further discussions of materials.

Provide us with the following when ordering

  1. Quantity of o-rings.
  2. Size by AS568 dash number, or I.D. and C.S., if ordering a non-standard.
  3. Material by hardness and two-digit material abbreviation.


To Place Orders or Quotations

PHONE: 1.800-828-7745
FAX: 716-684-8302
e-mail: [email protected]

NOTE: For complete list of o-ring seal sizes, please use the O-Ring Size Search Tool.