Valley Hydraulic Service Logo 24/7 On-Site Service

Visit one of our Express Hose Center Stores. We're ready to serve you while you wait.

Express Hose Center Store

New additions to our product line



Metalwork Pneumatic

Pneumatic valves, cylinders, regulators, filters, push-in fittings

Hansen Couplers

Your solution to Hydraulic Quick Disconnect Applications, Flat Face Style, Poppet Style

BrakeQuip

Hose Assemblies and fittings for automotive and mobile applications

Call us today for complete product literature


Hydraulic SAE O-Ring Boss Adapters

O-Ring Boss Port Diagram

Recommended by the NFPA for optimal leakage control in medium and high pressure hydraulic systems. The male fitting has a straight thread and O-ring. The female port has a straight thread, a machined surface (minimum spot face) and a chamfer to accept the O-ring. The seal take place by compressing the O-ring in the chamfer. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8 -02 5/16-24 5/16" (.31) 9/32" (.27)
3/16 -03 3/8-24 3/8" (.38) 11/32" (.34)
1/4 -04 7/16-20 7/16" (.44) 13/32" (.39)
5/16 -05 1/2-20 1/2" (.50) 15/32" (.45)
3/8 -06 9/16-18 9/16" (.56) 17/32" (.51)
1/2 -08 3/4-16 3/4" (.75) 11/16" (.69)
5/8 -10 7/8-14 7/8" (.88) 13/16" (.81)
3/4 -12 1 1/16-12 1 1/16" (1.06) 1" (.98)
7/8 -14 1 3/16-12 1 3/16" (1.19) 1 1/8" (1.10)
1 -16 1 5/16-12 1 5/16" (1.31) 1 1/4" (1.23)
1 1/4 -20 1 5/8-12 1 5/8" (1.63) 1 9/16 (1.54)
1 1/2 -24 1 7/8-12 1 7/8" (1.88) 1 13/16" (1.79)
2 -32 2 1/2-12 2 1/2-12" (2.50) 2 7/16" (2.42)
eaton aeroquip fittings

We are an authorized distributor of Eaton Aeroquip products. Other manufacture's part numbers shown for reference.

O-Ring Boss and Port Adapters are available in our On-Line Store

Common SAE Straight Thread O-Ring Fittings and Adapters
Image Description Part # / SKU
Pipe to SAE O-Ring Adapter Pipe to SAE O-Ring Adapter
External Pipe / SAE O-Ring Boss (internal)
Aeroquip # 2246-x-xS
Parker # x-x-FHG5-S
Female Pipe Swivel to SAE O-Ring Straight Thread Adapter
Internal Pipe Swivel (NPSM) / SAE O-Ring Boss
Aeroquip # 2066-x-xS
Parker # 0507-x-xS
SAE O-Ring Boss to Female Pipe Female Pipe Adapter
Internal Pipe / SAE O-Ring Boss
Aeroquip # 2216-x-xS
Parker # x-x-F50G-S
SAE O-Ring to Swivel pipe 45 degree elbow  45° Straight Thread Adapter
Internal Pipe Swivel (NPSM) / SAE O-Ring Boss (adj.)
Aeroquip # 2067-x-xS
Parker # 3507-x-xS
90 Degree straight thread adapter 90° Straight Thread Adapter
Internal Pipe Swivel (NPSM) / SAE O-Ring Boss (adj.)
Aeroquip # 2068-x-xS
Parker # 2507-x-xS
Female Pipe Elbow 90° Straight Thread Adapter
Internal Pipe / SAE O-Ring Boss (adj.)
Aeroquip # 206801-x-xS
Parker # x-x-AOEG-S
SAE O-Ring Boss Reducer SAE O-Ring Reducer
SAE O-Ring Boss / SAE O-Ring Boss (internal)
Aeroquip # FF1010-x-xS
Parker # F50G5-x-xS
O-Ring Boss Plug O-Ring Boss Hex Head Plug
Aeroquip # 900598-xS
Parker # x-P50N-S
SAE O-Ring Boss Hollow Hex Plug O-Ring Boss Hollow Hex Plug Aeroquip # FF2138-xS
Parker # x-HP50N-S
O-Ring Boss Union Straight Thread O-Ring Union
O-Ring Boss / O-Ring Boss (adj.)
Aeroquip # 2220-x-xS
Parker # x-F50HAO-S

Brands and product names are trademarks or registered trademarks of their respective holders

 ©2011 Valley Hydraulic Service, Inc.