Circle Valve Technologies Inc.
1533 Gehman Road
Harleysville, PA 19438

Toll Free:800-645-6733
Phone: 267-933-6300
Fax: 267-933-6305
Email: [email protected]
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FO Series Face Seal Fittings

Features
  • O-ring seal to provide perfect leak-tight service for working conditions from critical vacuum to high pressure
  • O-ring contained completely for maximum efficiency
  • Smooth finish on gland face to ensure psitive seal
  • Test ports at nut for easy leak testing
  • Easy installation and maintenance
  • Silver-plated female threads
  • Standard surface roughness finished to an average of Ra 10 uin. (0.25 um)
  • Every gland and body marked with size, material and heat code
FO Series Fittings
Unit of Measure
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Item #

Body Type

Body Material

Connection Size 1

Connection Type 1

Connectiont Size 2

Connection Type 2

Operating Pressure

SS-WG-FO12-NS12 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 3/4 in N/A O-Ring Face Seal N/A 3/4 in N/A Male NPT N/A 0 to 3900 psig0 to 268 bar
SS-WG-FO16-NS16 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1 in N/A O-Ring Face Seal N/A 1 in N/A Male NPT N/A 0 to 2900 psig0 to 199 bar
SS-WG-FO4-ST7 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/4 in N/A O-Ring Face Seal N/A 7/16-20 in N/A SAE/MS Thread N/A 0 to 4500 psig0 to 310 bar
SS-WG-FO8-ST9 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 9/16-18 in N/A SAE/MS Thread N/A 0 to 4500 psig0 to 310 bar
SS-WG-FO8-ST12 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 3/4-16 in N/A SAE/MS Thread N/A 0 to 4500 psig0 to 310 bar
SS-WG-FO12-ST17 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 3/4 in N/A O-Ring Face Seal N/A 1 1/16-12 in N/A SAE/MS Thread N/A 0 to 3600 psig0 to 248 bar
SS-WG-FO16-ST21 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1 in N/A O-Ring Face Seal N/A 1 5/16-12 in N/A SAE/MS Thread N/A 0 to 2900 psig0 to 199 bar
SS-WG-FO4-FNS4 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/4 in N/A O-Ring Face Seal N/A 1/4 in N/A Female NPT N/A 0 to 6600 psig0 to 454 bar
SS-WG-FO8-FNS6 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 3/8 in N/A Female NPT N/A 0 to 5300 psig0 to 365 bar
SS-WG-FO8-FNS8 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 1/2 in N/A Female NPT N/A 0 to 4900 psig0 to 337 bar
SS-WG-FO12-FNS12 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 3/4 in N/A O-Ring Face Seal N/A 3/4 in N/A Female NPT N/A 0 to 4000 psig0 to 275 bar
SS-WG-FO16-FNS16 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1 in N/A O-Ring Face Seal N/A 1 in N/A Female NPT N/A 0 to 3000 psig0 to 206 bar
SS-WG-FO4-FL4 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/4 in N/A O-Ring Face Seal N/A 1/4 in N/A Tube Fitting N/A 0 to 10200 psig0 to 702 bar
SS-WG-FO8-FL6 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 3/8 in N/A Tube Fitting N/A 0 to 5800 psig0 to 399 bar
SS-WG-FO8-FL8 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 1/2 in N/A Tube Fitting N/A 0 to 5800 psig0 to 399 bar
SS-WG-FO12-FL12 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 3/4 in N/A O-Ring Face Seal N/A 3/4 in N/A Tube Fitting N/A 0 to 4000 psig0 to 275 bar
SS-WG-FO16-FL16 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1 in N/A O-Ring Face Seal N/A 1 in N/A Tube Fitting N/A 0 to 3000 psig0 to 206 bar
SS-WG-FO4 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/4 in N/A O-Ring Face Seal N/A 1/4 in N/A Union N/A 0 to 10200 psig0 to 702 bar
SS-WG-FO8 N/A Face Seal O-Ring Gland N/A 316 Stainless Steel N/A 1/2 in N/A O-Ring Face Seal N/A 1/2 in N/A Union N/A 0 to 5800 psig0 to 399 bar
SS-N-FO4 N/A Face Seal O-Ring Female Nut N/A 316 Stainless Steel N/A 1/8 in1/4 in N/A Female NPT N/A N/A N/A
SS-N-FO8 N/A Face Seal O-Ring Female Nut N/A 316 Stainless Steel N/A 3/8-1/2 in N/A Female NPT N/A N/A N/A
SS-N-FO12 N/A Face Seal O-Ring Female Nut N/A 316 Stainless Steel N/A 3/4 in N/A Female NPT N/A N/A N/A
SS-N-FO16 N/A Face Seal O-Ring Female Nut N/A 316 Stainless Steel N/A 1 in N/A Female NPT N/A N/A N/A
SS-N-FO4-B N/A Face Seal O-Ring Blind Nut N/A 316 Stainless Steel N/A 1/8-1/4 in N/A O-Ring Face Seal N/A N/A Blind Nut N/A
SS-N-FO8-B N/A Face Seal O-Ring Blind Nut N/A 316 Stainless Steel N/A 3/8-1/2 in N/A O-Ring Face Seal N/A N/A Blind Nut N/A
Unit of Measure
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