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Steel Tube Fitting, JIC 37 deg Flare Nut for 0.31 Inch OD Tube

A 0.67	B 0.62	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	Series 1290	Supplier Part Number 1290-5S	Tube O.D. 0.31	Tube O.D. 0.31	Alternate Part Numbers Alternate Part Number C1AJ79, Alternate Part Number MI-00317412, Alternate Part Number MINO-00015F64631	Product Weight 0.05 lbs

Product Questions & Answers 3

Product Questions & Answers

Got a line running 5/16 OD tube and need a new flare nut, this the right part for that size?

Question by: Neil B on Jul 18, 2025, 7:54 AM

For 5/16 inch OD tube, you want to be looking at a different size. This fitting is spec'd for 0.31 inch OD tube, which works out to roughly 5/16 inch, so yes, that lines up. The A dimension runs 0.67 and the B dimension is 0.62, so double-check those measurements against your existing hardware before ordering to make sure everything seats right.

Answer by: Customer Support on Jul 19, 2025, 1:01 PM

got a 0.31 inch OD tube with a JIC 37 flare on it, is this the right nut to replace the one i lost

Question by: Brett B on Aug 24, 2025, 2:03 PM

For a 0.31 inch OD tube using a JIC 37 degree flare, this part matches that application. It is an Eaton Aeroquip 1290 Series Versil-Flare spare flare nut meant for that tube size.

Answer by: Customer Support on Aug 26, 2025, 6:49 AM

Will this nut work on a standard JIC 37 degree flare fitting?

Question by: Scott S on Mar 24, 2026, 8:33 PM

As long as the tube is 0.31 inch OD, then yes, this JIC 37 degree flare nut should work.

Answer by: Customer Support on Mar 26, 2026, 6:44 PM

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Model Number	Tube O.D.	A	B
1290-4S	0.25	0.62	0.56
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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