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H-Seal (Metal Seal)
Custom Metal Fabrication

Bostec's revolutionary H-Seal are the most reliable, flexible and cost effective metal seals in existence. H-Seal™ provide an ultra high vacuum (UHV) seal that is particle free, impermeable to moisture and are interchangeable with elastomeric O-rings. Learn more about H-Seal ...

Guaranteed 100% reliable
Interchangeable with Elastomeric O-Rings
Cryogenic to 500+° C
Sizes from 0.300" to 14"
Available in Nickel, Aluminum, Copper


All Seals Incorporated
The Sealing Specialists
2110 S. Yale Street
Santa Ana, CA 92704
Phone: (714) 556-4931
Fax: (714) 557-3257

SEALS › O-Rings

Parco - High Performance Seals


Parco is a leading manufacturer of O-rings. An O-ring is a solid-rubber seal shaped like a doughnut or torus. When compressed between mating surfaces, an O-ring blocks the passage of liquids or gases. Parco O-rings are available in a wide range of standard and non-standard sizes suitable for nearly all sealing applications.

O-ring sizes are described by inside diameter (ID) and cross section (W). There are 369 standard sizes of O-rings with inside diameters ranging from 0.019 to 25.940 inches and cross sections ranging from 0.040 to 0.275 inch. Standard sizes are available in 5 popular cross-sectional diameters (0.070, 0.103, 0.139, 0.210 and 0.275 inch). Each O-ring size is identified by a "dash number." Each Parco "dash number" is the same as the Aerospace Standard (AS) 568A designations used throughout the O-ring industry.

Choose below to download information accordingly:
Parco O-rings Size Chart
O-rings Information Brochure
Elastomer Selection Guide
Nitrile Selection Guide
Fluorocarbon Selection Guide
2285-80 HNBR Seals
4081-90 Nitrile Seals
4623-90 Nitrile Seals
5778 EPDM Seals
9131 Fluorocarbon Seals
9162-95 Fluorocarbon Seals
9166-75 Fluorocarbon Seals
9167-60 Fluorocarbon Seals
Military & Aerospace Seals




For immediate assistance - Call 800-553-5054
We can supply custom molded o-ring designs in any material and in virtually any shape or size. Send your drawings for quote or call to discuss product or material design perimeters with our engineering department.


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