Service Since 1947 Hawthorne Rubber is your one source for Standard and Custom Rubber O-Rings Hawthorne Rubber Mfg. Corp. stocks, and supplies AS-568A and most common metric size, including a wide variety of non-standard MIL Spec. and government standard O-rings. Standard O-ring sizes range from 1/32" to 26" I.D.'s, 3/32" to 26 1/2" O.D.'s, and cross sections from 1/32" to 1/4". We also manufacture precision custom molded o-rings, gaskets and seals to your exact specification with a fast and on time delivery. We injection, compression and transfer mold O-rings, gaskets and seals in many rubber compounds and durometers. Parts are available in Nitrile (Buna-N, Hycar, Paracril and NBR), Butyl, Neoprene (Chloroprene), Natural Rubber (Polyisoprene), Hypalon, Fluorocarbon (Viton® and Fluorel), Epichlorohydrin, EPDM (Ethylene Propylene), Silicone, Fluorosilicone, Urethane, Polyacrylate, Styrene Butadiene (SBR, GRS and Buna-S), Hydrogenated Nitrile, Vamac®, Herclor, Epichlorohydrin and Kalrez®. Durometers from 25 to 90 Duro. Shore A and formulas are available to meet industrial, milatary, FDA and UL standards. Online Request For Quotation Form. Tables: Standard Size AS-568A Hawthorne Rubber Mfg. Corp. P.O. Box 171 35 Fourth Avenue Hawthorne, NJ 07507-0171 Phone: 973-427-3337 FAX: 973-427-8233 or 800-643-2580 e-mail address: contact@hawthornerubber.com ...Home Page, Hawthorne Rubber Mfg. Corp. Last updated: February 8, 2012 Fluorel is a trademark of Dyneon LLC. Viton and Kalrez are registered trademarks of DuPont Dow Elastomers L.L.C. Vamac is a registered trademark of DuPont. Neoprene rubber, a product of DuPont Dow Elastomers L.L.C. Copyright ©2004 Hawthorne Rubber Mfg. Corp., All Rights Reserved.