Hydraulics Inc Swivels, Couplings & Seal Kits

Hydraulics Inc, founded in 1955 in Fort Worth, Texas, builds fluid-conducting swivels and thread-to-connect couplings for harsh-duty industrial work in mining, oil and gas, construction, and utility applications. The company is still active, producing inline and angular swivel families alongside its poppet-style and flat-face coupling lines for high-pressure hydraulic circuits. Northern Hydraulics supplies Hydraulics Inc swivels, couplings, and seal kits, and cross-references their part lines for replacement and equivalent applications.

Hydraulics Inc Product Lines & Series

Hydraulics Inc organizes its catalog around live swivel and coupling families engineered for high-pressure, harsh-duty service:

• S-Inline and HS swivel series – inline fluid-conducting swivels, with the HS heavy-duty inline line introduced in 2010 and rated up to 5,000 psi.
• 9S, 9SS, and 18S swivels – 90-degree, dual-plane, and parallel-plane configurations for angular and multi-plane motion.
• Flange swivels – SAE and ISO port configurations for flanged hydraulic connections.
• 5TV poppet-style couplings – introduced in 1968 in bore sizes from 3/4″ to 3″.
• 6TV flanged couplings – SAE J518 flanged port, rated 5,000 psi, introduced in 2001; the 6TV couples with the 5TV series.
• TVF flat-face couplings – flat-face style introduced in 2015 for cleaner connect-disconnect in contaminated environments.
• E Series couplings – built for refrigerant applications.
• Seal kits and control systems – swivel and coupling seal kits, hydraulic throttle control systems, and rapid-response torque control units.

You can browse the full range of Hydraulics Inc swivels and hydraulic fittings we carry, or send a part number for a specific series.

Cross-Referencing Hydraulics Inc Parts

If you are matching a Hydraulics Inc swivel or coupling by series, bore size, or port configuration, we can cross-reference the part to a current equivalent. Seal kits ship with alternative seal materials – including Buna-N and neoprene – so a swivel or coupling can be rebuilt for the temperature, fluid, and environmental compatibility your application requires. The 6TV flanged couplings interchange with the 5TV poppet-style series, which helps when you are mixing connection styles across older and newer equipment. For an inline swivel, an angular 9S, 9SS, or 18S unit, or a 5TV, 6TV, or TVF coupling that is no longer on your shelf, send us the markings and we will identify the equivalent. Request a Hydraulics Inc cross-reference and we will match your part by series and specification.