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04MORB EXTERNAL HEX PLUG

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Description & Features

This straight steel 04MORB EXTERNAL HEX PLUG from Brennan Industries features a 7/16-20 thread size, manufactured to SAE J514 specifications.

Designed with a male SAE O-ring boss thread type, this external hex head plug ensures a secure and reliable seal in hydraulic applications.

SKU: 6408-04-O

Supplier Part Number (MPN): 6408-04-O

Alternate Part Numbers: 6408-04, 6408-04-0, A900598-4S

Specifications

Brand
BRENNAN
Connection Size 1
1/4 in
Connection Type
Male SAE ORB
Connection Type 1
Male SAE ORB
Dimension Standards
SAE J1926, SAE J514
Dimensions
0.67 in L
Finish
Trivalent Zinc-Plated
Fitting Type
Plug
Hex Size
0.563 in
Material
Steel
Material Construction
AISI 12L14/1045 Steel
Operating Temperature
-40 to 250 deg F
Seal Material
NBR
Series
6408-O Series
Thread B1 Drill Dimensions
0.172 in
Thread Size
7/16-20

Product Questions & Answers (2)

Question by: Tammy C on Dec 22, 2025, 10:30 AM
thread size on this one is 7/16-20, that right? need to match it up to a port on a hydraulic manifold before I go ordering a handful of em
Answer by: Customer Support on Dec 24, 2025, 8:30 AM
Correct, the thread is 7/16-20 and it follows the SAE J514 spec for male O-ring boss fittings. That's a standard 04 MORB size, so as long as your manifold port is spec'd for 04 MORB, you're good to go. The O-ring seal is NBR material, which handles most common hydraulic fluid types just fine.
Question by: Johnny W on Apr 6, 2025, 11:30 AM
What size thread does this plug have? Just want to make sure I'm getting the right one.
Answer by: Customer Support on Apr 8, 2025, 9:31 AM
It comes with a 7/16-20 thread size, which should fit most standard SAE O-ring boss ports.

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