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Stainless Steel Duolok Tube Fitting, 0.38 Inch Tube OD To 3/8-18 Male NPT, Straight

A 1.57	B 1.28	D 0.66	E 0.28	Brand Ssp Fittings Corp	Brand SSP Fittings Corp	Pack Size 1.00	UOM EA	Supplier Part Number ISSD6MC6	T 0.38	Thread 1 3/8-18	Alternate Part Numbers Alternate Part Number C1FP29, Alternate Part Number MI-08750237, Alternate Part Number MINO-00766X89728, Alternate Part Number SS-600-1-6	Product Weight 0.12 lbs

Product Questions & Answers 4

Product Questions & Answers

Will this fitting hold up alright in a hydraulic setup? Just wanna make sure before I order a bunch.

Question by: Diane S on Dec 17, 2025, 6:51 PM

Duolok fittings are generally rated to handle pressures equal to the maximum allowable working pressures of stainless steel tubing, which is what's recommended for use with these fittings. There are a few exceptions for specialized fittings, so if you have any concerns about your specific application, it's best to give us a call for some help.

Answer by: Customer Support on Dec 19, 2025, 11:33 AM

got a 3/8 tube line, will this fitting match up with a 3/8-18 male NPT port?

Question by: Connie P on Feb 23, 2026, 9:57 AM

It is a straight Duolok tube fitting made for 0.38 inch tube OD on the tube side and a 3/8-18 male NPT thread on the other end.

Answer by: Customer Support on Feb 25, 2026, 8:04 AM

got a run of 3/8 tube and need to land it into 3/8-18 npt. is this the right straight fitting for that?

Question by: Hugh F on Sep 19, 2025, 6:55 AM

For tying 3/8 inch tube OD into a 3/8-18 male NPT port, this one matches that setup. It is a straight Duolok tube fitting with a 0.38 inch tube OD end and a 3/8-18 male NPT thread on the other side.

Answer by: Customer Support on Sep 21, 2025, 6:21 AM

these swap out with Swagelok fittings, right? got a panel full of them and need to know before i order

Question by: Wes H on Jul 11, 2025, 12:01 PM

Full interchangeability with Swagelok brand fittings is built into the Duolok design. SSP engineers these to the same dimensional standards, so swapping them in won't require any rework or adapter pieces. The double ferrule design functions the same way, and the connection process is identical to what you're already used to.

Answer by: Customer Support on Jul 12, 2025, 1:50 PM

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Model Number	T	Thread 1	A	B	D	E
ISSD10MC8	0.63	1/2-14	1.93	1.53	0.96	0.47
ISSD4MC4	0.25	1/4-18	1.49	1.2	0.6	0.19
ISSD6MC6	0.38	3/8-18	1.57	1.28	0.66	0.28