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Steel Adapter, 1/4-18 Female NPT Swivel To 9/16-18 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight

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Description & Features

Designed for use in demanding industrial environments, this Steel Adapter, 1/4-18 Female NPT Swivel To 9/16-18 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight is part of the Eaton Aeroquip 2066 Series and provides a reliable straight connection between NPT and SAE O-ring Boss ports. The female NPT swivel end allows for easy assembly and alignment without rotating the mating component, while the male SAE straight thread O-ring boss end ensures a leak-resistant seal suited to hydraulic system requirements.

Built from steel for durability under pressure, this adapter is well-suited for marine and military applications, chemical processing, pulp and paper industries, food and beverage processing, and off-shore drilling environments. With an overall length of 1.14 inches, it fits compact installation spaces without compromising connection integrity. The Eaton Aeroquip catalog reference for this part is C1AZ75.

SKU: 2066-4-6S

Supplier Part Number (MPN): 2066-4-6S

Alternate Part Numbers: C1AZ75, MI-00321819, MINO-00015F66128

Specifications

A
1.14
Alternate Part Numbers
Alternate Part Number C1AZ75, Alternate Part Number MI-00321819, Alternate Part Number MINO-00015F66128, Alternate Part Number MINO-00925X09324
Application
Marine/Military, Chemical Processing, Pulp and Paper Industries, Food and Beverage Processing, Off-Shore Drilling
Brand
Danfoss Power Solutions (II LLC Aeroquip)
Brand
Aeroquip
Pack Size
1.00
UOM
EA
End Gender 1
13553
End Gender 2
13556
End Size 1
0.25
End Size 2
0.56
End Type 1
NPSM
End Type 2
SAE ORB
Hex Size 2
0.69
Minimum Working Temperature
-40
Supplier Part Number
2066-4-6S
Thread 1
1/4-18
Thread 2
9/16-18
Thread Sealant
No
Product Weight
0.09 lbs

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Product Questions & Answers (3)

Question by: Darryl B on Aug 27, 2025, 2:41 PM
got a 1/4-18 female NPT port on a pump and need to connect it to a 9/16-18 SAE O-ring boss fitting, this the right adapter for that?
Answer by: Customer Support on Aug 29, 2025, 1:15 PM
That's what this one's built for. The 2066-4-6S bridges a 1/4-18 female NPT swivel end to a 9/16-18 male SAE O-ring boss, straight configuration. The swivel end gives you a little wiggle room during assembly so you're not fighting the line to get everything to line up. It's from Eaton Aeroquip's 2066 series, so the machining and tolerances are consistent with what you'd expect from that line.
Question by: Earl C on Sep 10, 2025, 12:33 PM
trying to hook a 1/4-18 female NPT line up to an ORB port, is this the right adapter?
Answer by: Customer Support on Sep 11, 2025, 1:56 PM
Function-wise it bridges those two thread types in a straight adapter: 1/4-18 female NPT swivel on one end to a 9/16-18 male SAE O-Ring Boss (straight thread O-ring) on the other.
Question by: Sherry H on Apr 2, 2025, 5:43 PM
Would this adapter work okay in a saltwater environment on a boat?
Answer by: Customer Support on Apr 3, 2025, 8:29 PM
These Eaton Aeroquip adapters are often used in marine applications, so it should hold up just fine in a saltwater environment.