Steel Adapter, 7/16-20 Male SAE O-Ring Boss (Straight Thread O-Ring) To 9/16-18 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 1.16	Alternate Part Numbers Alternate Part Number 6410-04-06, Alternate Part Number AFF1010-0406S, Alternate Part Number C1DY34, Alternate Part Number FF1010-0406S, Alternate Part Number MI-00320750, Alternate Part Number MINO-00028F65945	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6410-04-06-O	Thread 1 7/16-20	Thread 2 9/16-18	Thread Sealant No	Product Weight 0.09 lbs

Product Questions & Answers

Will this fitting work to connect a 7/16-20 male to a 9/16-18 female, both with O-ring boss? Just making sure before I order.

Question by: Patty F on Dec 27, 2025, 11:10 AM

This adapter is indeed designed to connect a 7/16-20 male SAE O-Ring Boss to a 9/16-18 female SAE O-Ring Boss, as described.

Answer by: Customer Support on Dec 28, 2025, 4:25 PM

Model Number	Thread 1	Thread 2	A
6410-24-12-O	1-7/8-12	1-1/16-12	1
FF1010-1006S	7/8-14	9/16-18	0.81
FF1010-1008S	7/8-14	3/4-16	1.25
FF1010-1208S	1-1/16-12	3/4-16	1
FF1010-1612S	1-5/16-12	1-1/16-12	1.59
6410-04-06-O	7/16-20	9/16-18	1.16
6410-05-04-O	1/2-20	7/16-20	1.22
6410-06-04-O	9/16-18	7/16-20	1.03
6410-06-08-O	9/16-18	3/4-16	1.39
6410-08-04-O	3/4-16	7/16-20	0.81
6410-08-08-O	3/4-16	3/4-16	1.39
6410-08-10-O	3/4-16	7/8-14	1.48
6410-10-12-O	7/8-14	1-1/16-12	1.66
6410-12-04-O	1-1/16-12	7/16-20	1.09
6410-16-06-O	1-5/16-12	9/16-18	1.13
6410-24-20-O	1-7/8-12	1-5/8-12	1.58
FF1010-0806S	3/4-16	9/16-18	1.06
FF1010-1206S	1-1/16-12	9/16-18	1
FF1010-1210S	1-1/16-12	7/8-14	1.44
FF1010-1216S	1-1/16-12	1-5/16-12	1.79
FF1010-1608S	1-5/16-12	3/4-16	1
FF1010-2016S	1-5/8-12	1-5/16-12	1