Skip to the beginning of the images gallery

20 EXTERNAL HEX PIPE PLUG

Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 5406-P-20	Product Weight 0.92 lbs

Product Questions & Answers 2

Product Questions & Answers

got a port i need to cap off, is this plug the one with the 1-1/4-11-1/2 male nptf threads?

Question by: Ricky W on Mar 26, 2026, 8:18 PM

For thread fit, you want to match the 1-1/4-11-1/2 male NPTF thread. This plug is exactly that, and it’s built to the SAE J476 thread specification.

Answer by: Customer Support on Mar 28, 2026, 6:03 AM

Thread size on this one is 1-1/4-11-1/2 NPTF -- that right for a standard 1-1/4 inch pipe fitting port?

Question by: Billy H on Jan 16, 2026, 8:19 PM

Yeah, that matches up. The 1-1/4-11-1/2 thread is the standard NPTF size for a 1-1/4 inch port, and this plug is built to SAE J476 spec, so it'll seat the way you'd expect in a properly tapped NPTF port. The male NPTF thread is a dry-seal design, meaning it relies on thread interference to hold pressure rather than needing extra sealer in most cases.

Answer by: Customer Support on Jan 18, 2026, 6:11 AM