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ADAPTER 5/16MB X 1/8 MP

Description & Features

Manufactured from straight steel, this Male SAE O-Ring Boss to Male NPTF adapter provides a reliable threaded transition between two common hydraulic fitting standards. The ADAPTER 5/16MB X 1/8 MP features a 5/16 Male SAE O-Ring Boss (1/2-20, per SAE J514) on one end and a 1/8-27 Male NPTF thread (per SAE J476) on the other, with an NBR O-ring seal that helps maintain a secure, leak-resistant connection at the SAE ORB port.

At an overall length of 1.050 inches, this compact straight adapter is suited for tight-clearance installations where a direct port-to-port connection is needed between ORB and NPTF threaded components. Manufactured by Brennan Industries under their 6401-O series, it carries a Proposition 65 warning for California residents.

SKU: 6401-05-02-O

Supplier Part Number (MPN): 6401-05-02-O

Alternate Part Numbers: C1EK72

Specifications

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6401-05-02-O	Product Weight 0.04 lbs

Product Questions & Answers (1)

Question by: Lynn H on Jan 27, 2026, 8:49 AM

So, this here adapter, it's got different threads on each end, right? What kinda threads are we talkin' about?

Answer by: Customer Support on Jan 28, 2026, 4:30 PM

You're right, it does have different threads. One end is a 5/16 Male SAE O-Ring Boss, and the other is a 1/8-27 Male NPTF thread.