Designed for instrumentation, hydraulic, and pneumatic systems, the Danfoss / Eaton Weatherhead 681X5X4 Male Connector is a straight brass adapter with a 1/4-18 NPTF male thread on one end and a 5/16 in. hose/tube female end on the other. The 0.562 in. hex provides a clean wrenching surface, and the all-brass construction suits a wide range of fluid media and environmental conditions.
Manufactured under the Eaton Aeroquip line, this connector features Dura-Kote plating for corrosion resistance and is rated for operating pressures above SAE standards. A minimum working temperature of -65°F supports use in cold-environment applications. With hundreds of compatible styles available in the same series, integrating this fitting into varied system configurations is straightforward.
SKU: 681X5X4
Supplier Part Number (MPN): 681X5X4
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Specifications
Alternate Part Numbers
Alternate Part NumberMINO-00015X07483
Application
Other - Instrumentation, hydraulic, and pneumatic systems
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13554
End Gender 2
13555
End Size 1
0.25
End Size 2
0.31
End Type 1
NPTF
End Type 2
Line/Hose/Tube
Features
Dura-Kote plating for superior corrosion resistance|Design flexibility with hundreds of styles to choose from|Higher operating pressures above SAE standards
Hex Size 2
0.56
ICC
Straight Adapters
Item Type
NPTF Male Male to Hose/Pipe/Tube Female
Language
English
Minimum Working Temperature
-65
Net Pack Quantity Units
EA
NMFC
60
Product Material
Brass
Product Width
0.56
Sub Brand
None
Supplier Part Number
681X5X4
Product Weight
0.06 lbs
Product Questions & Answers (1)
Question by: Freddie L on Feb 27, 2026, 2:05 PM
Will this fitting hold up if I'm running hydraulic fluid through it at, say, 2000 psi?
Answer by: Customer Support on Feb 28, 2026, 9:54 PM
Designed for instrumentation, hydraulic, and pneumatic systems, this Eaton/Danfoss fitting exceeds SAE standards for operating pressure.