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Brass Compression Nut For Plastic, Copper, & Aluminum Tubing, 0.31 Inch Tube OD

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Description & Features

Designed for use with copper plastic and aluminum tubing the Danfoss / Eaton 61x Series Spare Part Nut is a versatile component suited for instrumentation hydraulic and pneumatic systems. Constructed from CA360 brass it ensures durability and reliability in demanding environments.

This compression fitting is easy to assemble without flaring offering cost-effective installation. It meets ASA ASME and SAE specifications and standards and is available in a broad selection of styles and sizes.

The fitting can withstand working pressures up to 2000 psi with a 4:1 safety factor depending on the tube size. It operates efficiently within a temperature range of -65F to +250F with metal tubing and up to the specified range for compatible plastic tubing. Features include fair vibration resistance with the recommendation to use a long nut for enhanced vibration resistance.

Assembly involves straightforward steps such as cutting tubing to length sliding the nut and sleeve onto the tube and tightening the nut after lubricating the threads. Please review the detailed assembly instructions for complete guidance.

Conformance to industry standards and the practical application in various systems make this product an essential component in your technical arsenal.

Supplier Part Number: 61X5

Specifications

C
0.56
D
0.32
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
L
0.44
Supplier Part Number
61X5
Tube O.D.
0.31
Tube O.D.
0.3125
Alternate Part Numbers
Alternate Part Number C1HQ77, Alternate Part Number MI-00333916, Alternate Part Number MINO-00925F73313
Product Weight
0.02 lbs

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Product Questions & Answers (1)

Question by: Howard M on Jan 23, 2026, 9:06 AM
what's the working pressure rating on this nut, and is it the same across all tube sizes?
Answer by: Customer Support on Jan 24, 2026, 5:09 PM
Pressure capacity on compression fittings like this one depends on tube size, so the 2000 psi maximum doesn't apply equally across the board. That figure comes with a 4:1 safety factor built in, but smaller or larger tube sizes will shift where that ceiling lands. For 5/16 inch OD tubing specifically, check the rated pressure for that size against your system requirements before installing.