Parker 12MSC12N-B 3/4 in Compression X Mnpt Connector

Product Description

The PARKER 12MSC12N-B is a brass compression tube connector designed to create a leak-tight mechanical joint between a compression tube end and a male NPT threaded port. The fitting accepts a 3/4 inch thread size and is rated for a maximum working pressure of 1900 psi, making it suitable for high-pressure fluid and gas line applications. Constructed from brass to ASME-SB75 and ASTM-B75 standards, this connector delivers reliable performance in plumbing, HVAC, and industrial tubing systems. Plumbers, pipefitters, and HVAC technicians install this type of fitting when transitioning between compression tubing and threaded pipe connections.

This fitting is used in residential and commercial applications where copper or compatible soft tubing must connect to a male NPT threaded component. Typical install scenarios include instrumentation lines, refrigerant-adjacent fluid circuits, compressed air distribution, and general-purpose hydraulic or pneumatic tubing runs. The compression-by-MNPT configuration eliminates the need for soldering or flaring at the tube end, allowing for a tool-assisted mechanical connection. The Swagelok equivalent part number for cross-reference is B-1210-1-12.

Key Features

• Brass construction meets ASME-SB75 and ASTM-B75 material standards
• Maximum working pressure rated at 1900 psi
• 3/4 inch thread size with MPT thread standard
• Compression x MNPT end connections for tool-assisted, no-solder installation
• Overall length of 1.99 inches for compact inline fitment
• Cross-references to Swagelok part number B-1210-1-12

Compatibility

Designed as an OEM-style compression-to-male-NPT connector for use with compatible 3/4 inch compression tubing in plumbing, HVAC, and industrial fluid or gas line assemblies. Cross-references to Swagelok B-1210-1-12.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician. Shut off system pressure and bleed all residual line pressure before removing or installing any compression fitting. Use an appropriately sized open-end or adjustable wrench to tighten the compression nut; do not overtighten, as brass fittings can crack under excessive torque. Verify that the tubing end is cut cleanly and deburred before seating it in the compression fitting to ensure a proper seal.