1/4″ x 3/8″ Steel Hex Nipple – NPT Male x Male – Model 5404-06-04

The 1/4″ x 3/8″ Steel Hex Nipple (Model 5404-06-04) is a heavy-duty pipe fitting used to connect components with different NPT thread sizes. Featuring a hex body for easy wrench tightening, this durable steel nipple is perfect for adapting pressure washing, softwash, and industrial fluid systems with 1/4″ and 3/8″ female NPT ports.

Includes:

• One (1) hex nipple with 1/4″ M-NPT x 3/8″ M-NPT threads

• Forged steel construction

• Hex center for secure installation

Performance Specifications: 

• Connection Sizes: 1/4″ NPT Male x 3/8″ NPT Male

• Material: Carbon steel

• Finish: Zinc-plated or black oxide (varies by inventory)

• Model Number: 5404-06-04

• Thread Type: NPT (National Pipe Thread Tapered)

• Pressure Rating: Up to 3,000 PSI

• Temperature Range: –20°F to 400°F

Key Benefits:

• Reduces or increases line size between 1/4″ and 3/8″ ports

• Hex body allows easy tool tightening without thread damage

• Forged steel build for strength in high-pressure environments

• Perfect for softwash, pressure washing, and chemical setups

• Provides secure, leak-resistant connections in mixed thread systems