Milton’s hydraulic O-ring face seal (ORFS) industrial hose fittings are cost-effective, permanent, and they come as a crimp-style (one piece) fitting. Orfs fittings are becoming the most popular international fitting type used on global OEM machines due to their high level of sealing and their good vibration resistance. The female fittings have flat faces and straight threaded UNF swivel nuts. The male fittings have the O-ring in a groove in the flat face. All our ORFS fittings are ISO 121-51-1 / ISO 8434-3 / SAE J516 compliant. · Milton’s hydraulic O-ring face seal (ORFS) industrial hose fittings are cost-effective, permanent, and they come as a crimp-style (one piece) fitting. Orfs fittings are becoming the most popular international fitting type used on global OEM machines due to their high level of sealing and their good vibration resistance. The female fittings have flat faces and straight threaded UNF swivel nuts. The male fittings have the O-ring in a groove in the flat face. All our ORFS fittings are ISO 121-51-1 / ISO 8434-3 / SAE J516 compliant.