Steel Adapter, 1-1/4-11-1/2 Male NPT Countersunk Hex Plug

A 0.83	Alternate Part Numbers Alternate Part Number 5406-HHP-20, Alternate Part Number C1EX75	B 0.75	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 5406-HP-20	Thread 1 1-1/4-11-1/2	Thread Sealant No	Product Weight 0.39 lbs

Product Questions & Answers

Will this plug work with standard NPT fittings?

Question by: Brett H on Nov 30, 2025, 6:08 AM

This adapter features 1-1/4-11-1/2 male NPT threading, so it's designed to fit any standard female NPT fitting of the same size.

Answer by: Customer Support on Dec 1, 2025, 9:02 AM

Model Number	Thread 1	A	B
2222-6S	3/8-18	0.46	0.31
2222-8S	1/2-14	0.61	0.38
2222-2S	1/8-27	0.3	0.19
2222-4S	1/4-18	0.46	0.25
5406-HP-12	3/4-14	0.62	0.56
5406-HP-16	1-11-1/2	0.77	0.63
5406-HP-20	1-1/4-11-1/2	0.83	0.75
5406-HP-24	1-1/2-11-1/2	0.83	1