Shop Straight Male JIC - Male NPT Adapters
Our Straight Male JIC x Male NPT hydraulic adapters are vital fittings designed to create secure connections in hydraulic systems for transferring fluids and gases. The male end features a JIC (Joint Industry Council) connection, which utilizes a 37-degree flare seating surface and parallel threads, as defined by SAE J514. This design is common in fluid power applications, ensuring a reliable mechanical seal by establishing contact between the male flared seat and the female coned seat. On the other end, the male NPT (National Pipe Taper) connection uses tapered threads that seal as the male and female threads wedge together and deform slightly when tightened. Standard NPT (ASME B1.20.1) needs thread sealant or PTFE tape to complete the seal; NPTF dryseal (ASME B1.20.3) crushes the crests into the roots for a metal-to-metal seal without sealant, though sealant is often still used as a lubricant and backup. An NPT thread's outside diameter runs about 1/4" to 3/8" larger than its nominal pipe size (1/2" NPT measures about 0.840" OD at 14 TPI), so measuring the thread diameter and subtracting 1/4" only gives a rough estimate. Match the measured OD and threads per inch to a thread chart to confirm the size (1/8" 0.405", 1/4" 0.540", 3/8" 0.675", 1/2" 0.840", 3/4" 1.050", 1" 1.315", 1-1/4" 1.660", 1-1/2" 1.900", 2" 2.375"). While NPT connections are suitable for single assembly applications, they are not recommended for frequent disassembly due to potential wear on the threads. These adapters are ideal for professionals seeking efficient and dependable hydraulic solutions across various applications.
A straight male JIC x male NPT adapter (the "male JIC to MPT" adapter) threads into a female NPT port and gives you a 37° JIC connection for a hose end or tube nut. Choose the standard 2404, long 2404-L or extra long 2404-LL body, or the 2706 bulkhead style. Confirm both threads with the adapter guide, or call 281-941-2310.
Frequently Asked Questions
What does a male JIC x male NPT adapter connect?
One end is a male JIC connection: a 37° flare seat with parallel threads, defined by SAE J514. It seals when the male flared seat contacts the female coned seat, for example on a female JIC swivel hose end. The other end is a male NPT tapered pipe thread that seals into a female NPT port as the tapered threads wedge together and deform slightly, with thread sealant or PTFE tape completing the seal on standard NPT.
Is MPT the same as male NPT?
Yes. MPT (male pipe thread) and MNPT are common shorthand for a male National Pipe Taper thread. Most NPT adapters sold on OneHydraulics are the NPTF (dryseal) style but are listed simply as "NPT."
How do I find the right NPT size?
Measure the outside diameter of the pipe thread and subtract 1/4" to estimate the nominal pipe size. The JIC end is sized separately by dash number, and the two ends of an adapter are not always the same size. The adapter guide has a chart that lines up thread callouts with dash and inch sizes.
Can I take an NPT connection apart and reuse it?
NPT connections are best for joints that are assembled once. Repeated assembly and disassembly can wear the tapered threads, so they are not recommended where a connection will be broken often. Do not over-tighten, and use a thread sealant on the NPT end.
Will a JIC 37° adapter work with a 45° SAE flare fitting?
No. In the -02, -03, -04, -05, -08 and -10 sizes, SAE 37° and SAE 45° fittings share the same threads but not the same seat angles. Mixing them will leak, so check the seat angle before you order.
What is the difference between the standard, long, extra long and bulkhead styles?
All four are straight male JIC x male NPT adapters. The 2404 is the standard length, the 2404-L is a long version and the 2404-LL is an extra long version, for when you need more reach between the two ends. The 2706 is a bulkhead adapter, built to pass through and mount to a panel or wall.