37 Degree Light Duty Flange

37 Degree Light Duty Flange is a non-welded hydraulic pipe connection component featuring a 37-degree tapered flared sealing surface. It provides a secure, leak-tight joint between steel tubes or pipes in high-pressure hydraulic systems without the need for tack-welding, full welding, or pickling.Designed to SAE J518 Code 61 (3000 PSI) standard, this light-series flange uses the metal-to-metal contact of the 37° flare combined with an O-ring secondary seal to deliver reliable performance under dynamic pressure loads. It is a cost-effective and installation-friendly alternative to traditional welded flange systems.

Key functions

Connects hydraulic tubes and pipes to pumps, valves, cylinders and manifolds

Creates a pressure-rated, vibration-resistant seal

Enables quick assembly and disassembly for maintenance

Eliminates on-site welding and post-weld cleaning

Core Advantages & Selling Points

Welding-free installation — No tack-weld, no full weld, no acid pickling. Reduces on-site labor cost and installation time by up to 60%.

Dual sealing system — 37° metal flare seat + NBR/FKM O-ring provides double leak protection under pressure shock and vibration.

Lightweight compact design — Lower profile and reduced material weight compared to heavy-series Code 62 flanges, ideal for mobile equipment.

Universal interchangeability — Fully conforms to SAE J518 / ISO 6162-1, compatible with all major brand hydraulic components.

Broad size coverage — Available from 1/2" up to 5" tube OD, covering most mainstream hydraulic line diameters.

Corrosion resistance options — Zinc-plated carbon steel for standard use, 304 / 316L stainless steel for marine and corrosive environments.

Applications & Use Cases

The 37 Degree Light Duty Flange is widely used across industries where medium-to-high pressure hydraulic circuits require reliable, assembly-friendly connections.

Typical application areas:

Construction machinery — Excavators, loaders, bulldozers, cranes

Agricultural equipment — Tractors, harvesters, sprayers

Marine & offshore — Ship steering systems, deck machinery, hydraulic power units

Industrial hydraulic systems — Machine tools, presses, injection molding machines

Mining & tunneling equipment — Roof supports, drilling rigs, conveyors

Mobile hydraulic systems — Forklifts, aerial work platforms, material handlers

Frequently Asked Questions

Q1: What is the difference between light duty (Code 61) and heavy duty (Code 62) flanges?

A: Light duty Code 61 flanges are rated for 3000 PSI and used in standard hydraulic applications. Heavy duty Code 62 flanges are rated for 6000 PSI and used in high-pressure, heavy-duty systems. Choose based on your system pressure requirements.

Q2: Is welding required for installation?

A: No. The 37 Degree Light Duty Flange is designed for welding-free installation. No tack-welding, full welding, or acid pickling is required, saving up to 60% installation time compared to traditional welded flanges.

Q3: What sealing system does this flange use?

A: Dual sealing system – 37° metal flare seat provides primary metal-to-metal seal, while NBR/FKM O-ring provides secondary seal against pressure shock and vibration.

Q4: What O-ring materials are available?

A: Standard O-ring is NBR for general hydraulic oil applications. FKM (Viton) is available for high-temperature or chemical-resistant requirements. Please specify your fluid type and temperature range when ordering.

Q5: Are these flanges compatible with other brands?

A: Yes. Manufactured strictly to SAE J518 and ISO 6162-1 standards, our flanges are 100% interchangeable with all major global brands of Code 61 flanges.