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Steel Adapter, 1-5/16-12 Female JIC 37 deg Flare Swivel To 9/16-18 Male JIC 37 deg Flare, Straight

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Description & Features

This steel adapter facilitates connections between different JIC (Joint Industry Council) 37-degree flare fittings. It connects a 1-5/16-12 female JIC 37-degree flare swivel to a 9/16-18 male JIC 37-degree flare in a straight configuration.

Designed for diverse applications, this Eaton Aeroquip fitting ensures secure and reliable connections in hydraulic systems.

SKU: 221501-16-6S

Supplier Part Number (MPN): 221501-16-6S

Alternate Part Numbers: C1BC66, MI-00315862, MINO-00015F63949

Specifications

a Dimensions
1.16 in
Connection Size 1
1 in
Connection Size 2
3/8 in
Connection Type
Female JIC Swivel, Male JIC
Connection Type 1
Female SAE 37 deg JIC Flare Swivel
Connection Type 2
Male SAE 37 deg JIC Flare
Dimension Standards
SAE 070123/J514
Dimensions
1.84 in L
Finish
Dura-Kote™
Fitting Type
Adapter
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-65
Series
221501 Series
Thread Size
1-5/16-12 x 9/16-18
Tube OD
3/8 in

Product Questions & Answers (4)

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Question by: Denise C on Dec 30, 2025, 1:53 PM
trying to swap out an old reducer, will this one go from a 1-5/16-12 female JIC swivel down to a 9/16-18 male JIC?
Answer by: Customer Support on Jan 1, 2026, 6:52 AM
Match the threads and flare style and you are on the right track. This adapter is a straight reducer with a 1-5/16-12 female JIC 37 degree flare swivel on one end and a 9/16-18 male JIC 37 degree flare on the other.
Question by: Wade B on Apr 27, 2025, 9:10 PM
Will this adapter work to connect a 9/16-18 male JIC to a 1-5/16-12 female JIC?
Answer by: Customer Support on Apr 29, 2025, 8:38 AM
That's exactly what it's made for. It adapts a 1-5/16-12 female JIC 37-degree flare swivel to a 9/16-18 male JIC 37-degree flare in a straight line.
Question by: Lynn H on Aug 27, 2025, 2:50 PM
got a hose end that’s 1-5/16-12 female JIC swivel, and the port i need to hit is 9/16-18 male JIC. is this the right reducer or am i backwards
Answer by: Customer Support on Aug 28, 2025, 5:39 PM
Function-wise, it’s the reducer that bridges those two JIC 37 degree flare sizes in a straight adapter. One side is 1-5/16-12 female JIC 37 degree flare swivel, and the other side is 9/16-18 male JIC 37 degree flare, so it matches what you described.
Question by: Tommy Y on Aug 16, 2025, 6:38 AM
trying to figure out if this'll work as a reducer between my larger JIC line and a smaller fitting downstream, the size jump from 1-5/16-12 down to 9/16-18, is that what this thing does?
Answer by: Customer Support on Aug 18, 2025, 6:28 AM
That's what it handles. The female end accepts a 1-5/16-12 JIC 37 degree flare connection and the male end steps down to a 9/16-18 JIC 37 degree flare. Both ends use the same SAE 37 degree seat angle, so you're getting a straight reducer that keeps the JIC sealing geometry consistent on both sides. The swivel on the female end also makes it easier to thread everything up without fighting the line for alignment.

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