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Brass Compression Nut For Plastic, Copper, & Aluminum Tubing, 0.25 Inch Tube OD

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Description & Features

This precision-engineered compression nut is designed for durability and reliability in demanding applications. Manufactured by Danfoss Power Solutions (Aeroquip Inc-Alternate) this fitting is utilized in hydraulic pneumatic and instrumentation systems. Ensuring strong and secure connections it handles working pressures up to 2000 psi with a 4:1 safety factor depending on tube size.

With a temperature range of -65F to +250F for metal tubing this brass compression nut guarantees versatility in various environments. It is compatible with aluminum copper and plastic tubing although an insert is required for use with plastic tubing. The nut features an easy assembly process with no flaring needed making it both cost-effective and efficient.

Constructed from CA360 brass it meets ASA ASME and SAE standards. This compression nut is part of the Weatherhead Brass Compression Fittings series offering fair vibration resistance and the option for long nuts when increased vibration resistance is necessary.

MPN: EAR99

Supplier Part Number: 61X4

Specifications

C
0.50
D
0.26
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
L
0.44
Supplier Part Number
61X4
Tube O.D.
0.25
Tube O.D.
0.25
Alternate Part Numbers
Alternate Part Number C1HQ76, Alternate Part Number MI-00333913, Alternate Part Number MINO-00925F73312
Product Weight
0.01 lbs

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Product Questions & Answers (2)

Question by: Bobby J on Nov 17, 2025, 2:40 PM
Does plastic tubing work with this nut, or do I need anything extra to make it fit right?
Answer by: Customer Support on Nov 19, 2025, 6:42 AM
Plastic tubing does work with this fitting, but you'll need to use an insert alongside the nut. Without the insert, the compression won't seat properly and you'll likely end up with a leak. Copper and aluminum tubing go straight in with no extra hardware needed. No flaring required on any of them, which makes assembly pretty straightforward.
Question by: Merle P on May 12, 2025, 5:08 PM
Will this nut work on my existing 1/4 inch copper tubing for my air brake lines?
Answer by: Customer Support on May 13, 2025, 6:29 PM
This compression nut is designed to work with aluminum, copper, and plastic tubing that has a 0.25 inch outer diameter. It's worth noting that if you're using plastic tubing, you'll also need an insert.