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Brass SelfAlign Tube Fitting, 0.31 Inch Tube To 1/8-27 Male NPT, 90 deg Elbow

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Description & Features

This Eaton Aeroquip SelfAlign fitting is a 90-degree elbow designed to connect a 0.31-inch tube to a 1/8-27 male NPT thread. Constructed from durable brass, this fitting ensures a reliable and secure connection in hydraulic systems.

The Eaton Aeroquip Brass SelfAlign Tube Fitting offers ease of installation and dependable performance. This fitting, catalog number C1KV25, is suitable for various hydraulic applications.

SKU: 691X5

Supplier Part Number (MPN): 691X5

Alternate Part Numbers: C1KV25

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
5/16 in
Connection Size 2
1/8 in
Connection Type
MNPT, Tube
Connection Type 1
Tube OD
Connection Type 2
Male NPTF
d1 Dimensions
1/4 in
d Dimensions
1/4 in
Drop Dimensions
0.74 in
Fitting Type
90 deg Elbow
For Use With
Aluminum, Copper and Plastic Tubings
Hex Size
0.58 in, 0.56 in
m Dimensions
0.62 in
Material
Brass
Material Construction
Brass
n Dimensions
3/4 in
Segment Code
C
Series
691X Series
Thread Sealant
Without Thread Sealant
Thread Size
1/8-27

Product Questions & Answers (2)

Question by: Roger B on Feb 23, 2026, 6:45 PM
What size tubing does this elbow fit? Just want to make sure I'm ordering the right thing.
Answer by: Customer Support on Feb 25, 2026, 5:18 PM
This elbow fitting is made for 0.31 inch (that's about 5/16") OD tubing.
Question by: Floyd C on Nov 13, 2025, 6:45 PM
Got a 5/16 tube line coming off a small hydraulic valve block and need to route it around a corner with a 1/8 NPT male port, this fitting do that job?
Answer by: Customer Support on Nov 15, 2025, 12:33 PM
That's exactly the application this fitting handles. The tube side accepts 5/16 inch OD tubing and the threaded end is 1/8-27 male NPT, so it connects directly into a female NPT port on your valve block. The 90 degree elbow lets you redirect the line cleanly without bending the tube, which is especially handy in tight quarters around valve banks or manifolds.

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