Tube Fittings

DK-LOK vs Swagelok: are twin-ferrule fittings interchangeable? Learn what interchangeability means, what DK-LOK’s intermix testing shows, and how to protect your warranty.

Compare compression, weld, and threaded tube connections for instrumentation systems. Learn which tube connection method fits your pressure, leak, and maintenance needs. Call Collins-Oliver for a quote.

Understand tube fitting pressure ratings and how tube OD and wall thickness set the working pressure limit. Learn to read tube data tables the right way. Call Collins-Oliver for a quote.

Learn when and why to use bulkhead tube fittings for panel-mount tube connections. Understand bulkhead fitting design, uses, and install tips. Call Collins-Oliver for a quote.

Learn how reducing unions and reducers connect different tube sizes safely in instrumentation systems. Understand types, uses, and selection tips. Call Collins-Oliver for a quote.

Tube fitting material selection made simple. Compare 316 stainless, brass, and carbon steel by corrosion, pressure, and cost so you buy the right fitting the first time.

Twin-ferrule vs single-ferrule tube fittings explained. Learn how each design grips and seals, where each one wins, and how to choose the right fitting for your system.

A buyer’s guide to NPT vs BSPT vs AN thread types. Learn the thread angles, how each connection seals, and how to pick the right thread so your fittings mate and hold.

TL;DR The same fitting on the same tube, at the same joint, retightens reliably to […]

TL;DR Permanent compression fittings handle installed lines. Quick-connect couplings handle repeated connection cycles. If the […]

TL;DR Swagelok dominates instrumentation and process-control specifications. Parker dominates hydraulic and pneumatic distribution. Both brands […]