The Brennan Industries Steel Adapter ensures reliable connections between 3/4-16 Male SAE O-Ring Boss (Straight Thread O-Ring) and 1/2-14 Male NPT threads.
Manufactured with precision by Brennan Industries Inc, this adapter is designed for high-performance industrial applications.
Constructed from durable steel, it guarantees resilience and longevity in demanding environments.
This adapter does not include thread sealant, allowing for user-preferred sealing methods to be employed.
The adapter effectively connects different thread types, providing versatility for various industrial settings.
MPN: 6401-08-08-O
Supplier Part Number: 6401-08-08-O
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Specifications
Alternate Part Numbers
Alternate Part Number6401-08-08, Alternate Part Number C1EK77, Alternate Part Number MI-00316617, Alternate Part Number MINO-00028F64292
Brand
Brennan Industries Inc
Brand
Brennan Industries
Pack Size
1.00
UOM
EA
L
1.55
Supplier Part Number
6401-08-08-O
Thread 1
3/4-16
Thread 2
1/2-14
Thread Sealant
No
Product Weight
0.14 lbs
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Product Questions & Answers (5)
Question by: Phil T on May 14, 2025, 3:05 PM
So this here adapter...it'll go from a 3/4-16 SAE O-ring to a 1/2-14 NPT, right? Just wanna make sure I'm readin' this thing right.
Answer by: Customer Support on May 16, 2025, 1:38 PM
That's correct. It adapts a 3/4-16 male SAE O-ring boss to a 1/2-14 male NPT connection.
Question by: Larry W on Jan 11, 2026, 5:09 PM
got a hydraulic line running 3/4-16 straight thread on one end and need to tie into a 1/2 NPT port on a pump housing. this the right fitting for that?
Answer by: Customer Support on Jan 13, 2026, 9:25 AM
That connection is exactly what this adapter is built for. One end is 3/4-16 Male SAE O-Ring Boss, the other is 1/2-14 Male NPT, so it bridges those two thread standards in a straight configuration. The SAE O-Ring Boss end seals against an o-ring at the boss port, while the NPT end uses thread engagement at the pump housing. No sealant is included with the fitting, so you'll want to apply your own thread sealant on the NPT side before installation.
Question by: Tommy P on Oct 14, 2025, 7:19 AM
got a hose end with 3/4-16 ORB on it and the valve i’m tying into is 1/2-14 npt. is this the right adapter?
Answer by: Customer Support on Oct 15, 2025, 11:19 AM
For that combo, it matches up. One side is 3/4-16 Male SAE O-Ring Boss (straight thread O-ring) and the other side is 1/2-14 Male NPT, and it is a straight steel adapter.
Question by: Jimmy H on Nov 6, 2025, 3:40 PM
trying to hook an ORB port up to a pipe thread line, is this the right adapter?
Answer by: Customer Support on Nov 7, 2025, 5:15 PM
For tying those two thread styles together, it’s a straight steel adapter with a 3/4-16 male SAE O-ring boss on one side and a 1/2-14 male NPT on the other, so it’s meant to bridge an ORB connection to an NPT connection.
Question by: Roger W on Feb 15, 2026, 8:07 AM
What size are the threads on this adapter, I just want to make sure I'm getting the right thing.
Answer by: Customer Support on Feb 17, 2026, 7:26 AM
This adapter features a 3/4-16 Male SAE O-Ring Boss (Straight Thread O-Ring) on one end and a 1/2-14 Male NPT thread on the other. That's the long and short of it.
