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04 BULKHD LOCK NUT

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Description & Features

The Brennan Industries Inc bulkhead lock nut is crafted from straight steel ensuring durability and reliability in demanding industrial applications. This lock nut is part of the 0306 series and features a male JIC SAE 37-degree flare thread type conforming to the SAE J514 specification.

With a thread B1 size of 7/16-20 this nut is designed to secure tube OD 1/4 connections effectively. Its overall length is 0.280 mm and it has a C hex measurement of 0.687 mm. The lock nut is ideal for use in various heavy-duty settings where secure and stable connections are critical.

MPN: 04 BULKHD LOCK NUT 0306-04

Supplier Part Number: 0306-04

Specifications

Connection Size 1
1/4 in
Connection Type
JIC
Connection Type 1
SAE 37 deg JIC
Dimension Standards
SAE J514
Dimensions
0.28 in W
Finish
Trivalent Zinc-Plated
Fitting Type
Locknut
Hex Size
11/16 in
Material
Steel
Material Construction
12L14/C1045 Steel
Series
0306 Series
Thread Size
7/16-20
Tube OD
1/4 in
Tube Outside Diameter
1/4 in

Product Questions & Answers (1)

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Question by: Randy H on Dec 4, 2025, 10:13 AM
What size tube does this bulkhead lock nut fit? Just want to make sure it's the right one for my setup.
Answer by: Customer Support on Dec 6, 2025, 6:00 AM
This bulkhead lock nut is made to secure tube OD 1/4 connections, so if that's what you're working with, it should be a good fit.

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