87311 Hose Flange for Heavy-Duty Use​

Product Overview

The 87311 Hose Flange stands as a robust solution engineered specifically for heavy-duty hydraulic applications demanding exceptional strength, durability, and pressure containment capabilities. Designed to handle the most rigorous operating conditions, this flange provides secure connections in high-pressure hydraulic systems where failure is not an option. Unlike standard flanges, the 87311 is constructed with enhanced material thickness and reinforced bolt patterns to accommodate the extreme pressures and mechanical stresses encountered in heavy machinery and industrial equipment. Its rugged design has made it a cornerstone component in critical hydraulic systems across industries that require reliable performance under continuous heavy loads.

Product Features

Heavy-Duty Pressure Rating

Engineered for extreme pressure applications, the 87311 Hose Flange is rated for a maximum operating pressure of 5,075 PSI (350 bar), with surge pressure capabilities exceeding this rating for short durations. This places it in the high-pressure category of hydraulic flanges, suitable for systems powering heavy machinery and industrial presses. The flange's design incorporates thicker material sections at stress points and larger bolt diameters compared to standard flanges, distributing pressure loads more effectively and reducing the risk of deformation under extreme operating conditions.

Construction & Material Quality

The 87311 Hose Flange is manufactured from high-strength carbon steel (AISI 1045 or equivalent) that undergoes heat treatment to enhance tensile strength and toughness. For applications requiring superior corrosion resistance, a 4140 chrome-moly steel option is available, providing enhanced durability in harsh environments. The flange face features a precision-machined 30° sealing bevel that ensures optimal contact with mating flanges, while the serrated surface finish enhances gasket retention under high pressure. All surfaces receive a protective coating, either zinc plating or epoxy painting, to resist corrosion and extend service life in demanding environments.

Design & Compatibility

The 87311 Hose Flange conforms to SAE Code 62 specifications for high-pressure hydraulic flanges, ensuring compatibility with other Code 62 components from leading manufacturers. It features a four-bolt design with larger diameter bolts (typically 5/8" to 1") compared to standard flanges, providing superior clamping force to maintain seal integrity under high pressure. The flange is available in sizes from DN13 to DN76 (1/2" to 3" nominal) with various connection types, including weld-on hubs, threaded ends, and hose shanks, allowing integration with different hydraulic line configurations.

Applications

Heavy Construction Equipment

The 87311 Hose Flange is a critical component in large construction machinery, including hydraulic excavators, crawler dozers, and mobile cranes. It is used in main hydraulic circuits powering boom cylinders, bucket actuators, and swing mechanisms, where it must withstand extreme pressures during heavy lifting and earthmoving operations. The flange's robust construction ensures reliable performance in the harsh, vibration-intensive environment of construction sites.

Mining & Quarry Equipment

In mining operations, the 87311 Flange provides essential connections in hydraulic systems for haul trucks, loaders, and drilling equipment. Its high-pressure capability and durability make it suitable for the extreme operating conditions encountered in mining, where equipment operates continuously under heavy loads and is exposed to abrasive dust and moisture. The flange's reliability helps minimize downtime in mining operations where equipment availability directly impacts productivity and profitability.

Industrial Heavy Presses

Within manufacturing facilities, the 87311 Hose Flange is widely used in hydraulic presses, metal forming machinery, and forging equipment. These applications demand high pressure to shape and form metal components, requiring flanges that can maintain seal integrity during repeated pressure cycles. The flange's robust design ensures consistent performance in these high-demand applications, contributing to product quality and manufacturing efficiency.

FAQ

What makes the 87311 Hose Flange suitable for heavy-duty applications?

The 87311's suitability for heavy-duty use stems from several design features: its high-pressure rating of 5,075 PSI (350 bar), reinforced construction with thicker material sections at critical stress points, larger diameter bolts for increased clamping force, and high-strength steel material with heat treatment for enhanced durability. These features collectively enable the flange to withstand the extreme pressures, vibration, and mechanical stress characteristic of heavy machinery operations, providing reliable performance where standard flanges would fail.

How does the 87311 Flange differ from the 87392 Flange?

While both are hydraulic flanges, the key differences lie in their pressure ratings and construction: the 87311 is a Code 62 flange rated for 5,075 PSI, designed for high-pressure heavy-duty applications, while the 87392 is a Code 61 flange rated for 3,000 PSI for medium-pressure use. The 87311 features thicker construction, larger bolts, and a more robust design to handle higher pressures, whereas the 87392 offers a more cost-effective solution for lower pressure applications. The flange dimensions and bolt patterns also differ, making them incompatible with each other's mating components.

What type of gasket is required for the 87311 Hose Flange?

The 87311 Hose Flange requires SAE Code 62 gaskets specifically designed for high-pressure applications. These gaskets are typically constructed from metal-reinforced composite materials or solid metal with elastomeric seals, capable of maintaining integrity at pressures up to 5,075 PSI. Common materials include spiral-wound stainless steel with graphite filler for high-temperature applications, or rubber-coated metal for enhanced sealing in dynamic pressure environments. The gasket must match the flange size and pressure rating to ensure proper sealing and safety.

What torque specifications are required for installing the 87311 Flange?

Torque requirements for the 87311 Flange vary by bolt size and material, ranging from 50 ft-lbs for 5/8" bolts to 150 ft-lbs for 1" bolts when using Grade 8 or equivalent high-strength bolts. It is critical to follow the recommended torque sequence—a crisscross pattern starting with snug torque, then increasing in 30% increments to final torque—to ensure uniform clamping force across the flange face. Under-torquing can lead to leaks, while over-torquing may damage flange threads or cause flange distortion. A calibrated torque wrench should always be used for installation.