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Steel Adapter, 1/4-18 Female NPT To 1/2-20 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight

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Description & Features

This steel straight adapter connects a 1/4-18 female NPT port to a 1/2-20 male SAE O-Ring Boss (straight thread O-ring) port, providing a reliable transition between pipe thread and SAE ORB fittings in hydraulic systems. Part of the Danfoss Power Solutions (Aeroquip) 2216 Series, it is rated for use down to -40°F/°C, making it suitable for demanding environments including marine, military, chemical processing, pulp and paper, food and beverage processing, and off-shore drilling applications.

The Steel Adapter, 1/4-18 Female NPT To 1/2-20 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight features a straight configuration with a tube inner diameter of 0.23 inches on the NPT end. No thread sealant is required on the SAE ORB end, as sealing is achieved through the O-ring boss design. Catalog reference number C1BC79.

SKU: 2216-4-5S

Supplier Part Number (MPN): 2216-4-5S

Alternate Part Numbers: C1BC79, MI-00358907, MINO-00015F92907

Specifications

Brand
Aeroquip® by Danfoss
Connection Size 1
5/16 in
Connection Size 2
1/4 in
Connection Type
FNPT, Male SAE ORB
Connection Type 1
Male SAE ORB
Connection Type 2
Female NPTF
Dimension Standards
SAE J1926
Dimensions
1.2 in L
Finish
Dura-Kote™
Fitting Type
Adapter
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
2216 Series
Thread Size
1/2-20 x 1/4-18

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Product Questions & Answers (2)

Question by: Jean P on Sep 20, 2025, 2:39 PM
got a port that’s 1/4-18 female npt and i need to go into a 1/2-20 sae o-ring boss. is this the straight adapter for that?
Answer by: Customer Support on Sep 22, 2025, 10:43 AM
It’s a straight 2216 Series steel adapter that converts 1/4-18 female NPT on one end to 1/2-20 male SAE O-ring boss (straight thread O-ring) on the other, so it matches those thread callouts end for end.
Question by: Cheryl B on Feb 15, 2026, 12:43 PM
what industries is this adapter actually built for? trying to figure out if it'd hold up in our kind of work before I order a bunch of em
Answer by: Customer Support on Feb 16, 2026, 7:29 PM
Marine, military, chemical processing, pulp and paper, food and beverage, and offshore drilling are all listed applications for this adapter. That covers a pretty wide range of demanding environments, so odds are good it fits what you're dealing with. It's a steel Eaton Aeroquip unit from their 2216 series, which has a solid track record in industrial hydraulic systems.

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