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Stainless Steel Duolok Tube Fitting, 0.25 Inch Tube OD To 7/16-20 Male SAE O-Ring Boss (Straight Thread O-Ring), 90 deg Elbow

Description & Features

Duolok tube fittings by SSP Fittings Corp are engineered to offer reliable leak-proof connections in instrumentation and process tubing systems. The double ferrule design accommodates variations in tubing materials hardness and wall thickness ensuring dependable leak-tight connections across a wide range of applications.

Supplier Part Number: ISSD4MEST4

Manufactured from type 316 stainless steel all components are heat code traceable with certified material test reports available. Straight fittings comply with ASTM A-276 and ASTM A-479 standards while shaped bodies align with ASTM A-182 specifications. Duolok fittings are gaugeable ensuring sufficient pull-up during initial installation. These fittings have been tested to be completely interchangeable with the Swagelok brand. Generally they are rated for pressures equal to the maximum allowable working pressures of the recommended tubing. Some specialized fittings may have a lower pressure rating; for such applications assistance is available. Duolok tube fittings maintain functionality across a broad range of operating temperatures though elevated temperatures may reduce the system's maximum working pressure capability. For elevated temperature applications assistance is available.

MPN: ISSD4MEST4

Specifications

Brand Ssp Fittings Corp	Brand SSP Fittings Corp	Pack Size 1.00	UOM EA	Supplier Part Number ISSD4MEST4	T 0.25	Thread 1 7/16-20	Alternate Part Numbers Alternate Part Number C1GB86, Alternate Part Number MI-08750223, Alternate Part Number MINO-00766X89714	Product Weight 0.09 lbs

Similar Products

Model Number	T	Thread 1	Price	Action
ISSD4MEST4 Stainless Duolok To Male ORB 90 Elbow	0.25	7/16-20
ISSD6MEST8 Stainless Duolok To Male ORB 90 Elbow	0.38	3/4-16

Product Questions & Answers (3)

Question by: Randy M on Dec 27, 2025, 11:59 AM

Is this thing gonna hold up to some vibration? We run our equipment pretty hard.

Answer by: Customer Support on Dec 29, 2025, 6:21 AM

These Duolok fittings are built to provide a dependable, leak-proof connection, even when there's vibration in the system. The double ferrule design is what really helps, as it makes up for any variations in the tubing.

Question by: Wade H on Aug 31, 2025, 3:53 PM

these swap out direct with swagelok fittings, right? got a 1/4 inch tube line going into a male ORB port and don't wanna have to redo the whole setup

Answer by: Customer Support on Sep 2, 2025, 6:56 AM

Confirmed interchangeable with Swagelok brand fittings, so swapping them in without reworking your existing setup is exactly what these are built for. The 0.25 inch tube OD side bites down with a double ferrule, and the 7/16-20 male SAE O-Ring Boss thread handles the port connection. If your current line is already running 1/4 inch tube into a straight thread ORB port, this fitting slots right in.

Question by: Jimmy T on Oct 5, 2025, 6:57 AM

got a 1/4 inch stainless instrument tube line. is this the elbow that goes to a 7/16-20 ORB port or am i mixing things up

Answer by: Customer Support on Oct 6, 2025, 1:54 PM

For a 1/4 inch tube run going into a 7/16-20 male SAE O-Ring Boss straight thread port, that matches what this fitting is built for. It is a 90 degree elbow with a 0.25 inch tube OD Duolok compression end on one side and a 7/16-20 male ORB on the other.