PARKER Compression Fitting Adapter: 5/16 in OD x 1/4 in Pipe Fitting Size, Brass
The PARKER Compression Fitting Adapter (MPN 66C-5-4) is a standard sleeve brass compression fitting, supplied in a 10-pack. It connects 5/16 in OD tubing to a 1/4 in pipe fitting size, providing a reliable adapter…
SKU 3G-OTH-482178
Need installation or engineering help?
Ask a question
Product Description
The PARKER Compression Fitting Adapter (MPN 66C-5-4) is a standard sleeve brass compression fitting, supplied in a 10-pack. It connects 5/16 in OD tubing to a 1/4 in pipe fitting size, providing a reliable adapter solution for industrial fluid systems.
Frequently Asked Questions
What is the PARKER 66C-5-4 compression fitting adapter used for?
The PARKER 66C-5-4 adapter connects 5/16 in OD tubing to a 1/4 in pipe fitting in industrial fluid systems. It is a standard sleeve brass compression fitting, supplied in a 10-pack, providing a reliable solution for pneumatic, hydraulic, or instrumentation applications where leak-free connections are required.
What are the specifications of the PARKER 66C-5-4 compression fitting?
The PARKER 66C-5-4 is a brass compression fitting adapter with a 5/16 in OD tube size and a 1/4 in pipe fitting size. It is a standard sleeve type, sold in a 10-pack. The manufacturer part number is 66C-5-4, and the brand is PARKER.
Where to buy PARKER 66C-5-4 compression fittings worldwide?
3G Electric supplies the PARKER 66C-5-4 compression fitting adapter worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this brass fitting to your facility. Contact us for availability and lead time on orders.
How to install a PARKER brass compression fitting adapter?
To install the PARKER 66C-5-4, slide the nut and sleeve onto the tubing, insert the tube fully into the fitting body, then tighten the nut by hand. Use a wrench for final tightening—typically 1/4 turn past hand-tight for brass fittings. Avoid overtightening to prevent damage.
Used in
Common applications for PARKERPARKER Products
3G Electric supplies PARKER standard sleeve brass compression fittings. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.









