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12 SQUARE HEAD PIPE PLUG

Description & Features

Manufactured by Brennan Industries, this 3/4-14 male NPTF square head pipe plug is designed to seal ports and threaded openings in hydraulic systems and fluid circuit components. Conforming to SAE J476, it provides a reliable, pressure-tight closure in applications where a wrench-driven square drive head is preferred for installation and removal.

The 12 Square Head Pipe Plug is constructed from straight steel and has an overall length of 1.100 inches, with a thread drill size of 0.719 inches. The NPTF thread form creates a mechanical seal through thread interference, reducing reliance on sealants in many applications. Part of Brennan's 5406-SHP series, this plug is a practical choice for blocking unused ports on manifolds, valves, cylinders, and similar hydraulic components.

California Residents: Prop 65 Warning applies to this product.

SKU: 5406-SHP-12

Supplier Part Number (MPN): 5406-SHP-12

Specifications

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 5406-SHP-12	Product Weight 0.09 lbs

Product Questions & Answers (3)

Question by: Jimmy M on Jul 25, 2025, 3:44 PM

got a 3/4-14 port on a valve body. is this the right plug for that, or am i mixing up thread types

Answer by: Customer Support on Jul 26, 2025, 6:06 PM

For a 3/4-14 female NPTF port, this is the matching plug since it has a 3/4-14 male NPTF thread and conforms to SAE J476. It’s meant for sealing ports and other threaded openings on hydraulic components.

Question by: Tammy M on Oct 15, 2025, 6:06 PM

Will this plug hold up if I'm usin' it to block off a hydraulic line that sees a good bit of pressure?

Answer by: Customer Support on Oct 16, 2025, 6:28 PM

Designed to create a pressure-tight seal in hydraulic systems, this plug uses thread interference to minimize reliance on sealants.

Question by: Chad P on Dec 19, 2025, 11:00 AM

got a blocked port on a hydraulic manifold that takes a 3/4-14 thread, this plug gonna seal it up without needing any tape or thread sealant?

Answer by: Customer Support on Dec 20, 2025, 9:01 PM

NPTF threads work by creating a mechanical seal through thread interference, so in many applications you won't need tape or sealant. That's the practical advantage of NPTF over standard NPT. Whether you need a sealant in your specific setup depends on pressure conditions and surface finish in the port, but the thread form on this plug is built to handle sealing on its own in a good number of hydraulic applications.