Parker PN251-55 Male Pipe Thread Extended Nipple Brass Nptf

Product Description

The PARKER PN251-55 is a male pipe thread extended nipple fitting designed for hydraulic hose and fluid line connections in industrial applications. Machined from brass, this straight fitting uses NPTF threading to provide a pressure-tight seal without the need for additional sealant tape on properly mated connections. It carries a maximum working pressure rating of 200 psi and handles fluid temperatures from -20 degrees F to 400 degrees F. The 1/4 inch hose size and 1/8 inch thread size make it a compact, purpose-built connector for controlled-flow circuits. This is a non-valved fitting, meaning flow is unrestricted when connected. Plumbers, hydraulic technicians, and industrial maintenance professionals install this type of fitting in die casting equipment and mold coolant line assemblies.

The PN251-55 belongs to Parker's Moldmate series, which is engineered specifically for die casting equipment and mold coolant lines. These circuits require fittings that can handle repeated thermal cycling, coolant media, and the vibration loads common in production environments. The straight body profile and NPTF thread form suit installations where a direct inline connection is needed between a hose assembly and a threaded port. This fitting is sold individually and is appropriate for both new installations and maintenance replacement of worn or damaged nipple fittings in mold cooling circuits.

Key Features

• Brass construction resists corrosion in coolant and water-based fluid applications
• NPTF thread form creates a pressure-tight mechanical seal at the thread interface
• 200 psi maximum working pressure suits typical mold coolant line operating conditions
• Wide service temperature range of -20 degrees F to 400 degrees F accommodates hot mold environments
• Non-valved straight body allows unrestricted flow with no internal obstruction
• Part of the Parker Moldmate series, purpose-built for die casting and mold coolant systems

Compatibility

Designed for use with die casting equipment and mold coolant lines as part of the Parker Moldmate series. Suitable for 1/4 inch hose connections with 1/8 inch NPTF threaded ports.

Installation Notes

Installation should be performed by a qualified hydraulic or industrial plumbing technician. Depressurize and drain the fluid circuit completely before removing or installing any fittings. NPTF threads are designed to seal on the thread form itself; inspect mating port threads for damage or contamination before assembly. Do not overtighten brass fittings, as the material is susceptible to thread damage under excessive torque.