SAE Straight Thread
30⁰ Flare (Metric)
24⁰ Flareless (SAE)
24⁰ Flareless (DIN)
30⁰ Flare (BSPP)
O-Ring Face Seal (ORFS)
60⁰ NPSM Swivel
60⁰ Cone (BSPP)
60⁰ Cone (Metric)
Tapered Threads: These types of fittings have two types of threads: male or female. Male fittings feature their threads on the outside and female fittings have threads on the inside. When the male and female counterparts are threaded together, the tapered threads deform which applies pressure on the couplings ultimately making a tight seal. Tapered threads can be imprecise but never use Teflon tape to ensure the seal. Teflon tape is often banned in hydraulic and pneumatic systems because of its tendency to shred and contaminate sensitive areas. Its lubricity has also been known to induce over-torquing.
Lastly, measure the thread
Parker’s Hose Products Division has shadow images to easily determine thread, cone and hex size. Click on these images to print out a useful guide to assist in identifying hydraulic fittings.
Article contributed by Kyri McDonough, marketing services manager at Hose Products Division, Parker Hannifin.
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