Eaton 1290-8S Steel Flared Tube Nut 1/2 in Od 3/4-16 Sae

Product Description

The EATON 1290-8S is a three-piece steel flared tube nut designed for hydraulic and fluid-power tube assemblies. It accepts a 0.5 inch tube outer diameter and threads onto fittings with a 3/4-16 SAE thread. The 37-degree flare angle conforms to SAE standards, creating a leak-resistant metal-to-metal seal under pressure. Rated to 4000 psi maximum working pressure, this nut suits demanding service environments where a secure, reusable tube connection is required. Licensed plumbers, hydraulic technicians, and fluid-power mechanics install these nuts as part of flared-tube fitting assemblies on hydraulic lines, fuel systems, and pneumatic circuits.

This tube nut is suited for 37-degree JIC-style flare applications in industrial, mobile-equipment, and fluid-power systems. It is used wherever a 0.5 inch OD tube must be coupled to a 3/4-16 SAE-threaded fitting body. Typical installations include hydraulic return and pressure lines, fuel delivery plumbing, and lubrication circuits that require a reusable, metal-bodied connection. The SAE 070110 standard governs dimensional and performance requirements for this fitting.

Key Features

• 37-degree flare angle per SAE 070110 standard for leak-resistant metal-to-metal sealing
• 4000 psi maximum working pressure rating
• 3/4-16 SAE thread size for compatibility with standard JIC-style fitting bodies
• Steel construction for strength and durability in hydraulic and fuel-line service
• 0.84 inch overall length suits compact tube-end assemblies
• Three-piece assembly design allows tube preparation and installation without cutting the nut free

Compatibility

Designed as an OEM-style replacement or service fitting for 37-degree flare tube assemblies using 0.5 inch OD tubing with 3/4-16 SAE-threaded fitting bodies conforming to SAE 070110.

Installation Notes

Hydraulic technicians and pipefitters install this tube nut as part of a flared-tube assembly. Depressurize and drain the hydraulic or fluid circuit completely before disassembling any tube connections. Inspect the tube flare for cracks or deformation before assembling the nut; a damaged flare face will not seal reliably. Tighten to the fitting-body manufacturer's specified procedure using a calibrated flare-fitting wrench; do not over-torque, as this can crack the flare or distort the nut seat.