The Steel Adapter 3/4-16 Male SAE O-Ring Boss (Straight Thread O-Ring) To 1/4-18 Male NPT Straight by Brennan Industries Inc ensures reliable performance with its precision-engineered design. Constructed from high-quality steel this adapter is robust and designed for industrial applications where dependable connections are crucial.
The adapter features a 3/4-16 male SAE O-ring boss and a 1/4-18 male NPT providing compatibility with a wide range of industry-standard equipment. Its durable build guarantees longevity and resistance to harsh working environments.
Designed for seamless integration the steel adapter facilitates secure and leak-proof connections in various industrial setups. The absence of thread sealant indicates its suitability for systems requiring separate sealant applications.
MPN: C1EK76
Supplier Part Number: 6401-08-04-O
Loading related products…
Specifications
Alternate Part Numbers
Alternate Part Number6401-08-04, Alternate Part Number C1EK76, Alternate Part Number FMC3647011, Alternate Part Number MI-01604058, Alternate Part Number MINO-00028Q18763
Brand
Brennan Industries Inc
Brand
Brennan Industries
Pack Size
1.00
UOM
EA
L
1.24
Supplier Part Number
6401-08-04-O
Thread 1
3/4-16
Thread 2
1/4-18
Thread Sealant
No
Product Weight
0.11 lbs
Similar Products
Model Number
Thread 1
Thread 2
L
Price
Action
6401-08-06-OSteel Male ORB To NPT Adapter
3/4-16
3/8-18
1.36
6401-08-08-OSteel Male ORB To NPT Adapter
3/4-16
1/2-14
1.55
6401-08-12-OSteel Male ORB To NPT Adapter
3/4-16
3/4-14
1.59
6401-10-06-OSteel Male ORB To NPT Adapter
7/8-14
3/8-18
1.56
6401-10-08-OSteel Male ORB To NPT Adapter
7/8-14
1/2-14
1.69
6401-12-08-OSteel Male ORB To NPT Adapter
1-1/16-12
1/2-14
1.84
6401-12-12-OSteel Male ORB To NPT Adapter
1-1/16-12
3/4-14
1.73
6401-04-02-OSteel Male ORB To NPT Adapter
7/16-20
1/8-27
1.07
6401-06-02-OSteel Male ORB To NPT Adapter
9/16-18
1/8-27
1.11
6401-06-04-OSteel Male ORB To NPT Adapter
9/16-18
1/4-18
1.29
6401-06-06-OSteel Male ORB To NPT Adapter
9/16-18
3/8-18
1.3
6401-06-08-OSteel Male ORB To NPT Adapter
9/16-18
1/2-14
1.39
6401-08-04-OSteel Male ORB To NPT Adapter
3/4-16
1/4-18
1.24
6401-10-12-OSteel Male ORB To NPT Adapter
7/8-14
3/4-14
1.77
6401-16-16-OSteel Male ORB To NPT Adapter
1-5/16-12
1-11-1/2
1.9
6401-20-20-OSteel Male ORB To NPT Adapter
1-5/8-12
1-1/4-11-1/2
2.17
Product Questions & Answers (2)
Question by: Joyce M on Jul 11, 2025, 9:57 PM
Got a port on my hydraulic manifold threaded 3/4-16 ORB and need to tie into a 1/4 NPT line coming off a small gauge. This the right adapter to make that happen?
Answer by: Customer Support on Jul 13, 2025, 11:35 AM
Right fit for that setup. One end is 3/4-16 male SAE O-ring boss, the other is 1/4-18 male NPT, and the overall length is 1.24 inches. The O-ring boss end seals at the port face with an O-ring rather than relying on thread engagement alone, so you get a solid leak-resistant connection on the manifold side. Just make sure your gauge port is a female NPT to receive that 1/4-18 male end.
Question by: Rick D on Jun 24, 2025, 11:47 AM
Will this fitting hold up okay for hydraulic fluid?
Answer by: Customer Support on Jun 26, 2025, 11:37 AM
Absolutely, this steel adapter is designed for industrial applications, providing secure, leak-proof connections in hydraulic setups.
