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Steel Adapter, 3/4-16 Male SAE O-Ring Boss (Straight Thread O-Ring) To 7/16-20 Female SAE O-Ring Boss (Straight Thread O-Ring), Straight

A 0.81	Alternate Part Numbers Alternate Part Number 6410-08-04, Alternate Part Number AFF1010-0804S, Alternate Part Number C1DY38, Alternate Part Number FF1010-0804S, Alternate Part Number MI-00353389, Alternate Part Number MINO-00028F65948	Brand Brennan Industries Inc	Brand Brennan Industries	Pack Size 1.00	UOM EA	Supplier Part Number 6410-08-04-O	Thread 1 3/4-16	Thread 2 7/16-20	Thread Sealant No	Product Weight 0.13 lbs

Product Questions & Answers 1

Product Questions & Answers

got a port on my hydraulic block that's 3/4-16 ORB and i need to step it down to a 7/16-20 female connection. this the right bushing for that?

Question by: Jerry C on Dec 31, 2025, 11:17 AM

That's what this one's built for. The male end threads into your 3/4-16 ORB port, and the 7/16-20 female end accepts whatever fitting or line you're connecting on the smaller side. Brennan makes these to tight tolerances, so the straight thread O-ring seats on both ends seal up clean without a lot of fuss.

Answer by: Customer Support on Jan 2, 2026, 8:53 AM

Similar Products

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