QD-INDN4-4F - 1/4 Inch Industrial Air Nipple Female NPT Quick Connect

Industrial Grade Pneumatic Connection

The QD-INDN4-4F is a high-quality pneumatic air nipple designed for the rigorous demands of industrial and automotive environments. Conforming to the Industrial Interchange standard (often referred to as Type M), this fitting is among the most widely used profiles in the industry, ensuring compatibility with a vast array of existing air systems and couplers. The nipple features a 1/4-inch body size, which is the standard for general shop air lines, providing sufficient flow for most handheld pneumatic tools including impact wrenches, die grinders, and air ratchets.

Material and Durability

Constructed from plated steel, this nipple is engineered to resist mechanical wear and corrosion. Unlike softer brass fittings, steel nipples are heat-treated at critical wear points to prevent deformation caused by the locking balls of the coupler. This hardness is essential for maintaining a secure, leak-free seal over thousands of connection cycles. The plating offers additional protection against rust, ensuring the fitting maintains its integrity even in humid shop environments.

Thread Specifications

This specific model is equipped with 1/4-inch Female National Pipe Taper (FNPT) threads. This configuration is designed to thread onto 1/4-inch Male NPT fittings, such as those found on the ends of air hoses or directly on the inlets of certain pneumatic tools. The tapered thread design ensures a tight seal when used with appropriate thread sealant or Teflon tape, preventing air leaks that can reduce tool efficiency and overwork compressors.

Application Suitability

With a maximum working pressure typically rated around 300 PSI, the QD-INDN4-4F is well within the safety margins of standard shop air systems, which usually operate between 90 and 120 PSI. Its robust design makes it suitable for manufacturing facilities, assembly lines, and maintenance repair operations (MRO) where reliability is paramount.