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Danfoss / Eaton Stainless 1/4MP 4MJIC

Description & Features

The Eaton Aeroquip Stainless 1/4MP 4MJIC adapter is a high-performance solution designed for hydraulic, instrumentation, and chemical processing systems. Constructed from durable stainless steel, this adapter provides excellent resistance to corrosion, thanks to its Dura-Kote plating. The adapter features a male National Pipe Taper (NPT) connection on one end and a male SAE 37° flare on the other, with end sizes of 0.25 inches and 0.4375 inches respectively, offering flexibility in design and compatibility with a range of systems.

Exceeding SAE standards, this adapter supports higher operating pressures, making it suitable for demanding industrial applications. It is certified by SAE, ASA, and ASME, ensuring adherence to strict quality and performance standards. The Eaton Aeroquip brand, synonymous with reliability and innovation, ensures that this adapter meets the needs of professionals seeking robust and dependable components.

SKU: 259-2021-4-4

Supplier Part Number (MPN): 259-2021-4-4

Specifications

Application Other - Hydraulic, instrumentation, and chemical processing systems	Certifications SAE\|ASA\|ASME	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	End Gender 1 13554	End Gender 2 13556	End Size 1 0.25	End Size 2 0.44	End Type 1 NPT	End Type 2 NPTF	Features Dura-Kote plating for superior corrosion resistance\|Design flexibility with hundreds of styles to choose from\|Higher operating pressures above SAE standards	ICC Straight Adapters	Item Type NPT Male / SAE 37° Male Straight Adapter	Language English	Minimum Working Temperature -65	Net Pack Quantity Units EA	NMFC 50	Product Material Stainless Steel	Product Width 0.56	Sub Brand None	Supplier Part Number 259-2021-4-4	Product Weight 0.07 lbs

Product Questions & Answers (2)

Question by: Shawn A on May 16, 2025, 8:38 AM

got a line that’s 1/4 npt on one side and a 4 mjic on the other, is this the right straight adapter?

Answer by: Customer Support on May 17, 2025, 9:11 AM

Function-wise, it’s a straight adapter meant to connect a 1/4 inch male NPT end to a 4 MJIC (37 degree flare) male end. It’s part of the Danfoss Eaton 2021 Series straight adapters.

Question by: Bonnie M on Dec 6, 2025, 7:36 PM

Will this fitting hold up in a hydraulic system on a piece of farm equipment?

Answer by: Customer Support on Dec 8, 2025, 2:07 PM

Application-wise, this adapter is certainly suitable for hydraulic systems. It's also designed for instrumentation and chemical processing, so farm equipment should be well within its capabilities.