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Brass Compression Fitting For Plastic, Copper, & Aluminum Tubing, 0.38 Inch Tube OD To 1/4-18 Male NPT, Straight

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Description & Features

Ideal for hydraulic, pneumatic systems, and instrumentation, this fitting ensures optimal performance. It accommodates plastic, copper, and aluminum tubing, providing a versatile solution for various industrial needs.

The Weatherhead brass compression fittings from Danfoss Power Solutions meet ASA, ASME, and SAE standards. With a working pressure up to 2000 psi (4:1 safety factor), these fittings remain reliable under critical conditions. The assembly requires no flaring and is straightforward with provided nut and sleeve. Available in a broad selection of styles and sizes, they offer convenience and flexibility.

Constructed from CA360 brass, it operates effectively within a temperature range of -65deg;F to +250deg;F when using metal tubing. For plastic tubing, ensure compatibility with specified pressure and temperature ranges. This fitting has fair vibration resistance, with a long nut available for enhanced durability.

**Supplier Part Number:** 68X6

Specifications

Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
L
1.17
Supplier Part Number
68X6
Thread 1
1/4-18
Tube O.D.
0.38
Tube O.D.
0.375
Alternate Part Numbers
Alternate Part Number C1HR21, Alternate Part Number MI-00334065, Alternate Part Number MINO-00015X07516, Alternate Part Number MINO-00925F73367
Product Weight
0.07 lbs

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Product Questions & Answers (5)

Question by: Bobby T on Jul 12, 2025, 1:42 PM
got some 3/8 OD copper tubing i need to connect to a 1/4-18 male NPT port, this fitting gonna work for that?
Answer by: Customer Support on Jul 14, 2025, 6:11 AM
Copper tubing with a 3/8 inch OD connecting to a 1/4-18 NPT port is exactly what this fitting is sized for. No flaring needed either. Just cut your tubing clean, slide the nut and sleeve on before you insert the tube, push the tube all the way in until it bottoms on the shoulder, then hand tighten the nut and go 2-1/4 turns past that with a wrench. Working pressure runs up to 2000 psi depending on tube size, so it should handle most instrumentation and hydraulic line work without issue.
Question by: Lyle B on Aug 27, 2025, 8:03 PM
got a 3/8 inch tube and need to go into a 1/4-18 male npt port, is that what this fitting is?
Answer by: Customer Support on Aug 29, 2025, 6:58 AM
It is a straight compression male connector that takes 0.375 inch (3/8 inch) tube OD on one end and has 1/4-18 male NPT threads on the other.
Question by: Wes B on Jun 14, 2025, 7:06 AM
What kind of pressure can this fitting handle?
Answer by: Customer Support on Jun 16, 2025, 7:38 AM
This brass fitting is rated for working pressures up to 2000 psi, but that's with a 4:1 safety factor depending on the tube size you're using.
Question by: Lee G on Mar 28, 2025, 6:32 AM
Will this fitting hold up okay in a hydraulic system on a farm tractor? We use it pretty hard out here.
Answer by: Customer Support on Mar 30, 2025, 6:32 AM
It's rated to handle working pressures up to 2000 psi, which should be suitable for many hydraulic applications. Just make sure your system doesn't exceed that pressure, and you should be good to go.
Question by: Randy M on Oct 19, 2025, 8:36 AM
fitting says it works with plastic tubing -- how do I know what pressure range is safe for my application?
Answer by: Customer Support on Oct 20, 2025, 5:29 PM
For metal tubing like copper or aluminum, the working pressure tops out at 2000 psi with a 4:1 safety factor built in. Plastic tubing is a different story. You'll need to cross-check the pressure and temperature limits of your specific plastic tubing against those same thresholds before assuming it'll hold. The fitting itself is rated for that 2000 psi ceiling, but plastic tubing has its own limits that may fall short of that, so the tubing becomes your limiting factor, not the fitting.