Steel Adapter, 1/4-18 Female NPT To 9/16-18 Male SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 1.24	Alternate Part Numbers Alternate Part Number C1BC80, Alternate Part Number FMC600834, Alternate Part Number MI-00320200, Alternate Part Number MINO-00015F65786	Application Marine/Military, Chemical Processing, Pulp and Paper Industries, Food and Beverage Processing, Off-Shore Drilling	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	End Gender 1 13553	End Gender 2 13556	End Size 1 0.25	End Size 2 0.56	End Type 1 NPTF	End Type 2 SAE ORB	Minimum Working Temperature -40	Supplier Part Number 2216-4-6S	Thread 1 1/4-18	Thread 2 9/16-18	Thread Sealant No	Tube I.D. 1 0.30	Product Weight 0.04 lbs

Product Questions & Answers

Can this adapter handle marine environments without corroding too fast?

Question by: Wade R on Jan 25, 2026, 6:12 PM

This Eaton Aeroquip adapter is suitable for marine applications, along with chemical processing, pulp and paper, and food and beverage processing.

Answer by: Customer Support on Jan 27, 2026, 6:01 AM

Model Number	Thread 1	Thread 2	A
2216-12-12S	3/4-14	1-1/16-12	1.67
2216-16-16S	1-11-1/2	1-5/16-12	1.91
2216-2-4S	1/8-27	7/16-20	0.92
2216-8-8S	1/2-14	3/4-16	1.65
6405-24-20-O	1-1/4-11-1/2	1-7/8-12	2.12
2216-12-16S	3/4-14	1-5/16-12	1
2216-16-20S	1-11-1/2	1-5/8-12	1
2216-20-20S	1-1/4-11-1/2	1-5/8-12	2
2216-24-24S	1-1/2-11-1/2	1-7/8-12	2
2216-4-5S	1/4-18	1/2-20	1.2
2216-4-6S	1/4-18	9/16-18	1.24
2216-6-12S	3/8-18	1-1/16-12	1.34
2216-6-8S	3/8-18	3/4-16	1.25
2216-8-10S	1/2-14	7/8-14	1.54
2216-8-12S	1/2-14	1-1/16-12	1.72
6405-04-04-O	1/4-18	7/16-20	1.16
6405-04-06-O	3/8-18	7/16-20	1.21
6405-05-02-O	1/8-27	1/2-20	0.94
6405-06-06-O	3/8-18	9/16-18	1.16
6405-06-08-O	1/2-14	9/16-18	1.4
6405-08-04-O	1/4-18	3/4-16	1.16
6405-10-04-O	1/4-18	7/8-14	0.81
6405-10-06-O	3/8-18	7/8-14	1.55
6405-12-16-O	1-11-1/2	1-1/16-12	1.91
6405-16-08-O	1/2-14	1-5/16-12	1.61
6405-20-12-O	3/4-14	1-5/8-12	1.19
6405-24-16-O	1-11-1/2	1-7/8-12	1