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ORB Fitting Size: SAE O-Ring Boss Fittings - QC Hydraulics
A Comprehensive Guide to O-Rings for SAE O-Ring Boss (ORB)
SAE thread ORB fitting size chart
Fitting Thread Chart - Hydraulics Direct
O-Ring Size Chart for U.S. & Metric Standard Sizes
Hydraulic Fitting Identification and Connection Types - Brennan …
ISO 6149 Metric O-Rings - Global O-Ring and Seal