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Brass Compression Fitting For Plastic, Copper, & Aluminum Tubing, 0.50 Inch Tube OD To 3/8-18 Female NPT, Straight

Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	L 1.12	Supplier Part Number 66X8	Thread 1 3/8-18	Tube O.D. 0.50	Tube O.D. 0.5	Alternate Part Numbers Alternate Part Number C1HR11, Alternate Part Number MI-00334042, Alternate Part Number MINO-00925F73358	Product Weight 0.12 lbs

Product Questions & Answers 2

Product Questions & Answers

Will this fitting hold up okay in a hydraulic system, or is it more for lower pressure stuff?

Question by: Vince K on Jul 7, 2025, 6:21 PM

This brass fitting is rated for working pressures up to 2000 psi, but that's also tied to the tubing size. It's designed to handle robust industry requirements.

Answer by: Customer Support on Jul 9, 2025, 6:57 AM

fitting says it works with plastic tubing but does it need any kind of insert or extra part for that to work right?

Question by: Carl E on Mar 23, 2026, 7:48 AM

Plastic tubing does require an insert along with this fitting. You'll need the Eaton PT230 insert, which keeps the tubing from collapsing under compression when the nut is tightened. Without it, the sleeve won't seat properly against the plastic and you won't get a reliable seal. Metal tubing like copper or aluminum goes in without that extra step.

Answer by: Customer Support on Mar 24, 2026, 9:39 PM

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Model Number	Tube O.D.	Thread 1	L
66X4X4	0.25	1/4-18	1.03
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66X6	0.375	1/4-18	1.06
66X8	0.5	3/8-18	1.12