Midland Industries 20231 3/8 in Flareless Brass Nut Sleeve Assembly

Product Description

The MIDLAND INDUSTRIES 20231 is a universal hex nut and sleeve assembly designed for flareless tube connections in fluid and gas distribution systems. Built from brass, it provides a reliable mechanical grip on tubing without requiring a flared end. The assembly measures 0.37 inches in length with a 0.56-inch hex profile and carries a 1/2-24 thread size. It is rated for pressures up to 300 psi and a temperature range of -65 degrees F to 250 degrees F, making it suitable for a broad range of service conditions. Plumbers, pipefitters, and HVAC technicians working with compression-style fittings install this component as part of flareless tube assemblies.

This assembly is suited for residential and light commercial plumbing, refrigeration, and instrumentation tubing applications where flareless compression connections are specified. It is compatible with aluminum tubing, copper tubing, and hard plastic tubing when used with a brass sleeve. The minimum tube wall thickness required is 0.049 inches. Typical install scenarios include hydraulic lines, control tubing, and low-pressure pneumatic circuits where a clean, vibration-resistant connection is needed without flaring equipment on site.

Key Features

• Flareless design eliminates the need for a tube flaring tool during assembly
• Brass construction resists corrosion in both liquid and gas service
• Rated to 300 psi for reliable performance in low-to-medium pressure systems
• Wide temperature range of -65 degrees F to 250 degrees F covers most HVAC and plumbing environments
• Compatible with aluminum, copper, and hard plastic tubing when paired with a brass sleeve
• 1/2-24 thread size with 0.56-inch hex for standard wrench engagement

Compatibility

Designed for use with aluminum tubing, copper tubing, and hard plastic tubing with a brass sleeve. Minimum tube wall thickness is 0.049 inches. Fits flareless tube assemblies using a 1/2-24 thread and 3/8-inch connection size.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or HVAC technicians. Depressurize and isolate the line before disassembly or installation. Use a properly sized open-end or adjustable wrench on the 0.56-inch hex; do not overtighten, as brass threads can be damaged by excessive torque. Verify tubing wall thickness meets the 0.049-inch minimum before assembly to ensure a leak-free connection.