Triple-Lok 37° JIC flare fittings for reliable, leak-free hydraulic connections

Triple-Lok is Parker Hannifin's 37° flare (JIC) tube fittings and adapters for high-pressure hydraulics. They are leak-free, easy to assemble and available in steel, stainless steel, brass and aluminium in sizes 1/8”–2”. They meet SAE J514 and ISO 8434-2 and come with port types such as NPT, BSPP, BSPT and metric.

See all Triple-Lok products here.

What is Triple-Lok?

Triple-Lok is Parker's 37° flare (cone) JIC fittings consisting of three parts: fitting body, sleeve and nut. They are used for tube and hose connections in hydraulic systems and have been an industry standard since the 1930s.

Materials: Steel, stainless steel, brass, aluminium
Sizes: 1/8” to 2”
Standards: SAE J514, ISO 8434-2 (37° flare)
Port types: NPT, BSPP, BSPT, metric
Compatible media: Hydraulic oils, certain fuels and fluids (always check media compatibility and material selection)

Benefits of Triple-Lok in hydraulics

Reliable, leak-free connection when correctly assembled
Compact design – ideal in tight installations
High strength and resistance to vibration
Wide global availability and standardisation

Applications

Mobile hydraulics (construction machinery, agriculture, lifting equipment)
Industrial machinery and presses
Offshore and marine (stainless steel recommended due to corrosion)
Test equipment and pressure applications

Choosing the right Triple-Lok fitting

Pressure rating and size

Choose the size according to tube/hose dimension and the required flow/pressure
Use the manufacturer's pressure tables and always allow safety margins

Material and environment

Steel: standard, cost-effective
Stainless steel: corrosive environments/offshore
Brass: lower pressure, good corrosion resistance in certain media
Aluminium: low weight – assess pressure requirements carefully

Port and thread type

Match the machine's port: NPT, BSPP, BSPT, metric
Avoid mixing incompatible thread standards

Tube type and flaring

Inch or metric tube is possible – choose the correct sleeve for the tube type
The tube is flared to 37° with the correct flaring machine for tightness and strength

See the full range of pre-assembly and flaring machines here.

Why buy from Hymatik?

100,000+ item numbers in stock for fast delivery
International delivery
Hymatik sells and rents out flaring machines – contact us for advice
Easy ordering online or by phone/email
See the full product range and stock status
Tel.: 63 12 83 00

Frequently asked questions (FAQ)

What is the difference between JIC (37°) and ORFS? JIC uses a 37° metal-to-metal sealing surface. ORFS uses an O-ring face seal for extra protection against vibration and leaks in certain applications. The choice depends on pressure, vibration and service requirements.

Can I use metric tube with Triple-Lok? Yes. Switch to the correct sleeve for metric tube and flare the tube to 37°.

Which materials is Triple-Lok available in? Steel, stainless steel, brass and aluminium – choose according to pressure, corrosion and weight.

Which standards does Triple-Lok meet? SAE J514 and ISO 8434-2 for 37° flare.

Can Hymatik help with flaring and assembly equipment? Yes, we sell/rent out machines and advise on the correct set-up. Call 63 12 83 00 or write to PS@hymatik.com.