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Stainless Steel Duolok Tube Fitting, 0.25 Inch Tube OD To 1/4-18 Male NPT, 90 deg Elbow

Description & Features

SSP Fittings Corp provides the Duolok tube fittings renowned for their durable stainless steel construction that meets ASTM standards including A-276 and A-479 for straight fittings and A-182 for shaped bodies. Designed for a reliable leak-proof connection in instrumentation and process tubing systems these fittings utilize a double ferrule design to accommodate variations in tubing materials wall hardness and thickness. This ensures a leak-tight connection across a broad range of applications.

Duolok fittings are engineered to be interchangeable with Swagelok tube fittings offering flexibility in mixed brand systems. With a focus on gageability these fittings allow for sufficient pull-up during initial installation. Typically Duolok tube fittings are rated to handle the maximum allowable working pressures of compatible stainless steel tubing although certain specialized fittings may have different pressure ratings.

Functioning reliably over a wide temperature range elevated temperatures will reduce the tubing system's maximum working pressure. Material traceability is ensured through heat code marking with certified material test reports (CMTRs) available upon request.

Supplier Part Number: ISSD4ME4

Specifications

A 1.06	Bx 0.77	By 0.92	D 0.60	E 0.19	Brand Ssp Fittings Corp	Brand SSP Fittings Corp	Pack Size 1.00	UOM EA	Supplier Part Number ISSD4ME4	T 0.25	Thread 1 1/4-18	Alternate Part Numbers Alternate Part Number C1FP14, Alternate Part Number MI-04294582, Alternate Part Number MINO-00766X00042	Product Weight 0.08 lbs

Similar Products

Model Number	T	Thread 1	A	Bx	By	D	E
ISSD4ME4 Stainless Duolok To Male NPT 90 Elbow	0.25	1/4-18	1.06	0.77	0.92	0.6	0.19
ISSD6ME6 Stainless Duolok To Male NPT 90 Elbow	0.38	3/8-18	1.23	0.94	1.03	0.66	0.28
ISSD12ME12 Stainless Duolok To Male NPT 90 Elbow	0.75	3/4-14	1.57	1.17	1.45	0.96	0.62
ISSD4ME2 Stainless Duolok To Male NPT 90 Elbow	0.25	1/8-27	1.06	0.77	0.74	0.6	0.17
ISSD8ME6 Stainless Duolok To Male NPT 90 Elbow	0.5	3/8-18	1.42	1.02	1.11	0.9	0.38

Product Questions & Answers (3)

Question by: Wayne H on Dec 5, 2025, 8:18 PM

Will this elbow fitting hold up if I'm running hydraulic fluid through it? Just want to make sure it's compatible.

Answer by: Customer Support on Dec 7, 2025, 8:32 AM

This fitting is generally rated for pressures equal to the maximum allowable working pressures of stainless steel tubing, which is what's recommended for use with it. Just be aware that elevated temperatures can reduce the maximum working pressure, so if you're running hot fluid, it's best to call for application assistance to be sure.

Question by: Brett J on Jun 21, 2025, 8:41 PM

these fit with Swagelok fittings or are they a whole separate system?

Answer by: Customer Support on Jun 23, 2025, 6:27 AM

Duolok fittings are manufactured to be fully interchangeable with Swagelok brand tube fittings, so you can mix them into an existing Swagelok setup without issue. The tolerances and design are controlled to match up correctly during installation.

Question by: Duane R on Mar 25, 2025, 3:18 PM

these fittings interchangeable with Swagelok? got a mixed system and need something that'll drop right in without any headaches

Answer by: Customer Support on Mar 27, 2025, 10:01 AM

Duolok fittings are built to be fully interchangeable with Swagelok brand tube fittings, so swapping them into a mixed system works without any modification. Same dimensions, same double ferrule design, same pull-up behavior during installation. You can run both brands side by side without compatibility concerns.