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Steel Adapter, 9/16-18 Male SAE O-Ring Boss (Straight Thread O-Ring) To 3/4-16 Female JIC 37 deg Flare Swivel, Straight

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Description & Features

This steel adapter connects hydraulic, instrumentation, and chemical processing systems. Featuring a 9/16-18 Male SAE O-Ring Boss (Straight Thread O-Ring) To 3/4-16 Female JIC 37 deg Flare Swivel, this straight adapter ensures a secure connection.

The adapter has a thread 1 size of 9/16-18 and a thread 2 size of 3/4-16. It is designed with end 1 being male with SAE ORB type, and end 2 being female with SAE 37 type. End 1 size is 0.5625 and end 2 size is 0.75, with a hex size 2 of 0.875 and tube I D 2 of 0.3. It is designed to operate at a minimum working temperature of -40.

SKU: 2266-6-8S

Supplier Part Number (MPN): 2266-6-8S

Alternate Part Numbers: C1BD85, MI-00298952, MINO-00015F47383

Specifications

a Dimensions
1.18 in
Connection Size 1
3/8 in
Connection Size 2
1/2 in
Connection Type
Female JIC Swivel, Male SAE ORB
Connection Type 1
Male SAE ORB
Connection Type 2
Female SAE 37 deg JIC Flare Swivel
Dimension Standards
SAE J1926/J514
Dimensions
1.63 in L
Finish
Dura-Kote™
Fitting Type
Adapter
Hex Size
7/8 in
Material
Steel
Material Construction
Carbon Steel
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
2266 Series
Thread Size
3/4-16, 9/16-18
Tube OD
1/2 in

Product Questions & Answers (4)

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Question by: Danny L on Nov 14, 2025, 8:59 PM
got a hose end that’s 3/4-16 JIC, will this adapter mate up to it and what’s on the other side?
Answer by: Customer Support on Nov 16, 2025, 8:23 PM
Function-wise, it connects a 3/4-16 female JIC 37 degree flare swivel on one end to a 9/16-18 male SAE O-Ring Boss (straight thread O-ring) on the other. It is a straight steel adapter, so it is meant to transition between those two common hydraulic fitting styles.
Question by: Ray S on Dec 30, 2025, 11:36 AM
what's the thread setup on this thing, is the male end a straight thread or does it have a taper to it?
Answer by: Customer Support on Jan 1, 2026, 9:37 AM
The male end runs a 9/16-18 SAE O-Ring Boss, which is a straight thread design. It seals against a port using an O-ring rather than relying on a tapered thread crush like NPT does. The female end is a 3/4-16 JIC 37-degree flare swivel, so that side connects to a standard JIC fitting with the cone-style metal-to-metal seat. Two completely different connection styles on each end, which is exactly the point of an adapter like this.
Question by: Tommy M on Sep 8, 2025, 4:11 PM
trying to hook an ORB port to a JIC hose end, is this the right adapter or am i mixing up the threads
Answer by: Customer Support on Sep 10, 2025, 9:56 AM
Function-wise, it bridges a 9/16-18 male SAE O-ring boss (straight thread O-ring) connection over to a 3/4-16 female JIC 37 degree flare swivel, in a straight adapter body.
Question by: Phil H on Oct 21, 2025, 4:31 PM
What's the A dimension on this adapter? Just need to make sure it fits in the space I have.
Answer by: Customer Support on Oct 22, 2025, 7:55 PM
The "A" dimension, which I believe refers to the overall length, is 1.18 inches. This should help you confirm if it fits your space constraints.

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