Parker Triple-Lok 37° Flare Tube Fitting

Overview

Parker Triple-Lok 37° flare JIC tube fittings and adapters are Parker Hannifin’s original reusable, separable hydraulic tube fitting system, built around a metal-to-metal 37-degree flare seal that has been the reference standard for medium- and high-pressure hydraulic tube connections for decades. The design uses a three-piece configuration – sleeve, nut, and fitting body – giving technicians a connection that can be assembled and disassembled repeatedly in the field without losing sealing integrity, which is precisely why it remains the specified fitting on mobile hydraulics, industrial presses, machine tools, and fluid power skids across process and manufacturing plants.

As the official trusted supplier and regional supplier for Parker Hannifin, Seven Star LLC proudly supplies genuine Parker Triple-Lok fittings and adapters to industrial buyers throughout the Sultanate of Oman and the wider GCC. Every fitting is supplied on request with the manufacturer documentation available, which matters to a plant that depends on leak-free hydraulic circuits.

Sealing Principle

The Parker Triple-Lok fitting seals on a 37-degree flare formed on the end of the hydraulic tube. When the coupling nut is torqued, the flared tube face is drawn tightly against the mating 37-degree seat machined into the fitting body, creating a metal-to-metal line of contact that becomes progressively tighter as system pressure rises. There is no elastomer or soft seal in the primary sealing path of the standard Triple-Lok, so the joint is unaffected by fluid compatibility issues, high operating temperatures, or the seal degradation that plagues O-ring-only connections over years of thermal cycling.

Because the flare angle and seat geometry are held to tight tolerance, the same fitting can be broken and remade multiple times during maintenance, filter changes, or component replacement without re-flaring the tube, provided the flare face itself has not been damaged. The practical consequence for a maintenance team is fewer scrapped tube assemblies, faster turnaround on hydraulic repairs, and a joint that does not require the cure time, torque sensitivity, or contamination control that adhesive or crimped alternatives demand.

Engineering Design of the Parker Triple-Lok

Each Parker Triple-Lok fitting body is precision-machined from steel bar stock and typically zinc-plated for corrosion resistance in industrial and marine-influenced GCC environments, with stainless steel variants available for chemical, offshore, or hygienic applications. The sleeve is designed with a controlled wall section that grips the outside diameter of the tube as the nut is tightened, preventing the tube from being pulled out of the joint under vibration while still allowing the flare face to seat squarely against the fitting body.

The catalog spans straight unions, male and female JIC adapters, bulkhead fittings, tees, crosses, elbows at multiple angles, and adapters that step down to NPT, BSPP, SAE O-ring boss, and metric threads, which lets a single Parker Triple-Lok inventory bridge tube runs between pumps, valves, cylinders, and manifolds built to different regional thread standards. Sizes commonly range from 3/16 in to 2 in tube OD, covering everything from instrumentation-scale tubing to large-bore hydraulic power units.

Key Features

The Parker Triple-Lok range gives maintenance and design engineers a proven, field-serviceable connection with the following characteristics:

• Metal-to-metal 37-degree flare seal rated for demanding medium- and high-pressure hydraulic service, commonly to 3,000–9,000 psi depending on size and wall thickness.
• Fully reusable and separable design that permits repeated disassembly for maintenance without discarding the tube assembly.
• Wide material selection including plated carbon steel and 316 stainless steel for corrosive or hygienic environments.
• Extensive configuration range – unions, elbows, tees, crosses, bulkheads, and thread-converting adapters – covering JIC, NPT, BSPP, SAE, and metric interfaces.
• Compatible with standard Parker Triple-Lok flaring tools, so field technicians can fabricate replacement tube assemblies on site.
• Vibration-resistant sleeve geometry that maintains tube retention in mobile and high-cycle industrial equipment.
• Broad size range from small-bore instrumentation tube through large hydraulic power unit tube.
• Backward compatibility with decades of installed Parker Triple-Lok hydraulic systems, simplifying spares management for older plant.

Industrial Applications

Parker Triple-Lok 37-degree flare fittings are found wherever a plant runs rigid steel or stainless tube hydraulic circuits rather than flexible hose – hydraulic power units feeding presses and injection molding machines, mobile equipment manifolds, oilfield service skids, marine and desalination plant hydraulics, and the steel tube runs inside packaged pump skids used across Oman’s oil and gas, cement, and heavy manufacturing sectors. Their reusability makes them the preferred choice anywhere a hydraulic circuit is expected to be opened repeatedly for filter servicing, component swaps, or system modification over its operating life.

In Oman and the GCC, Seven Star LLC supplies Parker Triple-Lok fittings to fabrication shops, hydraulic hose and tube assembly houses, and plant maintenance departments throughout Muscat, Sohar, and the Salalah free zone, supporting both new tube assembly builds and emergency breakdown repairs. Lead time and availability are confirmed at quotation, so a facility can plan the replacement of a leaking union or a damaged elbow, which is often the difference between a short planned outage and an extended unplanned shutdown.

Technical Specifications

Representative specifications for the Parker Triple-Lok 37° flare tube fitting range are summarized below; exact ratings vary by size, wall thickness, and configuration – consult Seven Star LLC for the specific part number and pressure rating required for your tube schedule.

Request a Quote for Parker Triple-Lok

Seven Star LLC supplies Parker Triple-Lok fittings and adapters on request and is ready to support formal RFQs, project bill-of-material quotations, and urgent breakdown enquiries. Contact our instrumentation and fluid power division for the current Parker Triple-Lok technical catalog and datasheet download, sizing assistance for your tube schedule, or a quotation against a specific Parker part number. In Oman and the GCC, Seven Star LLC supplies Parker Triple-Lok fittings on request, with manufacturer documentation and lead time confirmed at quotation.

Browse the full Parker range or see more Pipes & Fittings products supplied by Seven Star LLC in Oman and the GCC.