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Welcome to my Thread Talks

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Welcome to my Thread Talk #6: SAE J512 and SAE J518

Welcome to my Thread TalksBy Christine ShawOctober 29, 2020Leave a comment

Previously the 45° version of SAE J512 was talked about. This is also known as Inverted Flare and is a connection frequently used in automotive systems. The female is always a straight thread with a 42° inverted flare. The male is either in tube fitted or machined adapter form. The tube fitted has the male…

Welcome to my Thread Talk #5: SAE J1926-1 and SAE J1453

Welcome to my Thread TalksBy Christine ShawOctober 13, 2020Leave a comment

SAE J1926-1 is also known as SAE Straight Thread O-Ring and O-Ring Boss (ORB). For hydraulic systems of medium or high pressure, this connection is the best for leakage control. Both the male and female portions of the connection have straight threading. The male portion has an O-ring on the end, while the female has…

Welcome to my Thread Talks #4: SAE J514 and J512

Welcome to my Thread TalksBy Christine ShawSeptember 23, 2020Leave a comment

SAE J514 was originally named JIC 37° Flare. JIC stands for Joint Industrial Commission, which is now defunct, and the seat of the connection is 37°. This connection is especially common in fluid power systems.  Since both the male and female halves have a 37° seat, the connection takes place in the contact between the…

Welcome to my Thread Talks #3: NPT vs NPSM

Welcome to my Thread TalksBy Christine ShawAugust 11, 2020Leave a comment

National Pipe Straight Mechanical (NPSM) has a straight thread, unlike NPT, which is tapered. NPSM is sometimes used for fluid power systems and male NPTF pipes will seal with an NPSM female pipe. However, a male NPT pipe will not fit in a female NPSM pipe. Being straight, NPSM pipes do not seal as effectively…

Welcome to my Thread Talk #2: IPS and NPS

Welcome to my Thread TalksBy Christine ShawJuly 22, 2020Leave a comment

Iron Pipe Size (IPS) is an old pipe sizing system that came was started in the early 19th century. It remained in effect until after WWII and was mainly used in the US and UK. When IPS was introduced, pipes were cast in halves and welded together. The sizing of IPS refers to the inside…

Welcome to my Thread Talks #1: NPT vs NPTF

Welcome to my Thread TalksBy Christine ShawJuly 17, 2020Leave a comment

National Pipe Taper (NPT) and National Pipe Taper Fuel (NPTF) are remarkably similar: both have the same taper and threads per inch, and the pitch diameter is the same. The difference is in the root and crest of the threads. NPT thread crest parameters encapsulate NPTF thread crests, even though the NPTF crests have a…

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