Midwest Fasteners Solid Brass NPSM Thread Compression Hex Nut

Midwest Fasteners Solid Brass NPSM Thread Compression Hex Nut

The Midwest Fasteners Solid Brass NPSM Thread Compression Hex Nut is machined from solid brass and built for compression-style tube and fitting connections used on plumbing, hydraulic, and instrumentation lines. This hex nut family uses NPSM thread for compatibility with standard compression fittings and is available in nominal sizes ranging from 1/8" through 7/8", including 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", and 7/8", with each size matched to a corresponding compression fitting of the same dimension. Made in the United States from solid brass, it delivers corrosion resistance and a reliable seal for maintenance techs, plumbers, and fabricators who need a compression nut that matches the exact thread and size of the fitting on hand. Select the nut size that corresponds to your fitting or tubing diameter to ensure a proper compression seal.

Key Features

• Size Range: Available from 1/8" up to 7/8" nominal size, matched to standard compression fitting hardware of the same dimension across the family.
• Material & Finish: Solid brass construction with a brass finish for corrosion resistance and smooth, consistent threading on every size offered.
• Thread/Connection: NPSM thread connection designed specifically for compression-style tube and pipe fittings.
• Type: Hex nut configuration for easy wrench or pliers tightening in tight access areas.
• Origin: Made in the United States for consistent quality control across every nut size in the family.
• Compatibility: Designed to pair with matching-size compression fittings for copper, plastic, and instrumentation tubing assemblies.

Technical Specifications

• Product Type: Hex Nut
• Product Material: Brass
• Product Finish: Brass
• Connection Type: NPSM Thread
• Country of Origin: United States
• Nut Size Range: 1/8" to 7/8", including 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", and 7/8".

Typical Applications

• Compression fitting connections on copper or plastic tubing
• Plumbing supply line and valve connections
• Instrumentation and gauge tubing assemblies
• Maintenance and repair of compression-style fittings
• Hydraulic and pneumatic tube connections requiring a brass seal

Why Midwest Fasteners?

Midwest Fasteners manufactures this compression hex nut family from solid brass with consistent NPSM threading and U.S. origin, giving contractors and maintenance techs a dependable match for compression fittings that need a reliable, corrosion-resistant seal, whichever size the job calls for. Across the full 1/8" to 7/8" size range, the brass construction and hex nut configuration make this a straightforward replacement part for plumbing, hydraulic, and tubing repairs where fit and material matter most. Choosing the correctly sized nut from this family ensures a proper mechanical match to the mating compression fitting, helping maintain a tight, leak-free seal on the line for the life of the connection.