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Steel Tube Fitting, JIC 37 deg Flare Nut for 0.25 Inch OD Tube

A 0.62	B 0.56	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	Series 1290	Supplier Part Number 1290-4S	Tube O.D. 0.25	Tube O.D. 0.25	Alternate Part Numbers Alternate Part Number C1AJ78, Alternate Part Number MI-00317401, Alternate Part Number MINO-00015F64630	Product Weight 0.04 lbs

Product Questions & Answers 3

Product Questions & Answers

got a 1/4 inch OD tube line, is this the right flare nut for it?

Question by: Rusty M on Oct 12, 2025, 12:10 PM

For a 0.25 inch outside diameter tube, this matches the size callout. It is a JIC 37 degree flared nut in the Aeroquip 1290 series.

Answer by: Customer Support on Oct 14, 2025, 6:40 AM

trying to replace a flare nut i lost, is 1290-4S the right one for 1/4 inch tube?

Question by: Lyle H on Jan 5, 2026, 8:06 PM

For 0.25 inch OD tube, the 1290-4S is the matching JIC 37 degree flare nut in the Eaton Aeroquip 1290 Series.

Answer by: Customer Support on Jan 7, 2026, 8:23 AM

Will this nut fit a standard JIC flared fitting on a 1/4 inch OD tube? Just want to make sure before I order.

Question by: Pete F on May 26, 2025, 8:49 PM

This flare nut is specifically designed to work with 0.25 inch OD tubing in JIC 37-degree flare connections. It's an Aeroquip by Danfoss/Eaton 1290 series Versil-Flare nut, so it should be compatible with other fittings designed to meet that standard.

Answer by: Customer Support on May 28, 2025, 7:37 AM

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Model Number	Tube O.D.	A	B
1290-4S	0.25	0.62	0.56
1290-10S	0.63	0.97	1
1290-12S	0.75	1.02	1.25
1290-16S	1	1.12	1.5
1290-6S	0.38	0.72	0.69
1290-8S	0.5	0.84	0.88
1290-20S	1.25	1.22	2
1290-3S	0.19	0.6	0.44
1290-5S	0.31	0.67	0.62