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Straight 5400 Coupling Thread

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Description & Features

This Eaton Aeroquip straight coupling is made from durable carbon steel. With a male UNEF end type and a line/hose/tube end type 2, this Straight 5400 Coupling Thread provides a dependable connection across a wide range of applications.

This nipple assembly features a -6 hose dash size, 0.875 end size 1, and is designed to cut assembly times and boost production.

SKU: FJ3970-0606S

Supplier Part Number (MPN): FJ3970-0606S

Specifications

Brand
Danfoss
a Dimensions
3.14 in
Compatible Hose ID
0.38 in
Connection Size 1
3/8 in
Connection Size 2
3/8 in
Connection Type
Hose, Threaded
Connection Type 1
Hose
Connection Type 2
Threaded
Construction Style
Reusable
Cut-Off Factor
1.62 in
Dimensions
3.14 in L x 1 in W x 1 in H
End Gender 1
Male
End Size 1
7/8 in
Finish
Zinc-Plated
Fitting Type
Hose Fitting
For Use With
E-Z Clip System A/C Refrigeration GH134 Series Hoses
Hex Size
0.984 in
Hose Dash Size
06
Inside Diameter
0.22 in
Material
Steel
Material Construction
Carbon Steel
nmfc
50
Seal Material
HNBR
Segment Code
C
Series
FJ3970 Series
Thread Sealant
Without Thread Sealant
Thread Size
7/8-20

Product Questions & Answers (3)

Question by: Warren M on Sep 28, 2025, 8:52 PM
what hose dash size does this coupling work with, and is the -6 size pretty common for shop equipment?
Answer by: Customer Support on Sep 30, 2025, 8:12 PM
For a -6 hose dash size, you're looking at a 3/8 inch internal diameter hose, which shows up all the time in hydraulic lines for shop presses, loaders, and general-purpose equipment. The 0.875 end size on the male UNEF side is a standard dimension that pairs up with a wide range of common hose assemblies, so sourcing compatible hose stock usually isn't a problem.
Question by: Sherry F on Dec 12, 2025, 9:32 AM
trying to swap out a nipple on a -6 hose, is this one the right size or am i off?
Answer by: Customer Support on Dec 14, 2025, 7:09 AM
For a -6 hose dash size setup, this nipple assembly matches that dash size and uses a male UNEF end on one side with a line, hose, or tube connection on the other. It also lists an end size 1 of 0.875, so those are the key fit points to match up.
Question by: Pete J on Dec 8, 2025, 9:13 PM
Will this here fitting work alright for hydraulic lines on my tractor?
Answer by: Customer Support on Dec 10, 2025, 6:13 AM
Designed to provide a dependable connection, this Eaton Aeroquip straight coupling should work well in a variety of hydraulic applications.

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