The Parker Stratoflex 300-4S is a straight reusable (field attachable) 37° flare hose fitting designed for use with compatible Stratoflex 111 Series hose assemblies. Engineered to aerospace standards, this fitting provides a secure, leak-resistant connection for fluid transfer systems commonly found on aircraft. Its field-attachable design allows qualified maintenance personnel to assemble or replace hose ends without specialized crimping equipment, making it an ideal solution for maintenance, repair, and overhaul (MRO) operations.

Designed for -4 (0.200-inch I.D.) hose, the fitting features a 7/16-20 threaded connection with a precision-machined 37° flare sealing surface. This metal-to-metal sealing design ensures reliable performance in demanding hydraulic, fuel, lubrication, and pneumatic systems where pressure integrity and dependable sealing are critical.

The "S" designation indicates a carbon steel construction, providing excellent mechanical strength, durability, and resistance to the demanding operating conditions encountered in aerospace applications. Precision manufacturing helps maintain proper fit, consistent sealing performance, and long service life when installed according to approved maintenance procedures.

The Parker Stratoflex 300-4S is widely used in aircraft hose fabrication and replacement, helping reduce maintenance downtime while maintaining the reliability and safety expected of OEM-quality aerospace fluid system components.

Key Features

- Part Number: 300-4S
- Manufacturer: Parker Stratoflex
- Component: Straight Field Attachable 37° Flare Hose Fitting
- Hose Size: -4 (0.200 in. I.D.)
- Thread Size: 7/16-20
- Connection Type: 37° Flare
- Material: Carbon Steel
- Compatible Hose: Stratoflex 111 Series
- Application: Aircraft hydraulic, fuel, oil, lubrication, and pneumatic systems
- Feature: Reusable field attachable design for OEM maintenance and hose assembly