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16 BULKHEAD LOCK NUT

Description & Features

Manufactured from straight steel, this fitting is designed for bulkhead installations requiring a secure, vibration-resistant connection in hydraulic line assemblies. The 16 Bulkhead Lock Nut features a Male JIC SAE 37-degree flare thread configuration conforming to SAE J514, with a 1 5/16-12 thread size corresponding to a 1-inch tube OD. Its 1.625-inch hex and 0.410-inch overall length make it well-suited for tight bulkhead panel mounting situations. Produced by Brennan Industries, it is part of the 0306 Series and carries a California Proposition 65 warning for applicable buyers.

SKU: 0306-16

Supplier Part Number (MPN): 0306-16

Alternate Part Numbers: A210212-16S

Specifications

Brand BRENNAN	Connection Size 1 1 in	Connection Type JIC	Connection Type 1 SAE 37 deg JIC	Dimension Standards SAE J514	Dimensions 0.41 in W	Finish Trivalent Zinc-Plated	Fitting Type Locknut	Hex Size 1-5/8	Material Steel	Material Construction 12L14/C1045 Steel	Series 0306 Series	Thread Size 1-5/16-12	Tube Outside Diameter 1 in

Similar Products

Model Number	Connection Size 1	Thread Size	Hex Size
0306-32 Steel Bulkhead Locknut	2 in	2-1/2-12	2-3/4 in
0306-02	1/8 in	5/16-24	0.563 in
0306-03	3/16 in	3/8-24	5/8 in
0306-04	1/4 in	7/16-20	11/16 in
0306-05	5/16 in	1/2-20	3/4 in
0306-06	3/8 in	9/16-18	0.81 in
0306-08	1/2 in	3/4-16	1 x 1 in
0306-10	5/8 in	7/8-14	1-1/8 in
0306-12	3/4 in	1-1/16-12	1-3/8 in
0306-14	7/8 in	1-3/16-12	1-1/2 in
0306-20	1-1/4 in	1-5/8-12	1-7/8 in
0306-24	1-1/2 in	1-7/8-12	2-1/8 in

Product Questions & Answers (3)

Question by: Jimmy C on Mar 29, 2026, 6:33 PM

What size wrench do I need to tighten this bulkhead lock nut?

Answer by: Customer Support on Mar 30, 2026, 7:18 PM

You'll need a 1.625-inch wrench to tighten this bulkhead lock nut properly.

Question by: Lance H on Jul 14, 2025, 5:13 PM

trying to swap out a bulkhead lock nut i lost, is this one the right size for a 1 inch tube?

Answer by: Customer Support on Jul 16, 2025, 10:52 AM

For a 1 inch tube OD bulkhead setup, this lock nut matches the common 16 JIC sizing. It uses a 1 5/16-12 male JIC SAE 37 degree flare thread per SAE J514, which is the thread size tied to that 1 inch tube OD.

Question by: Melvin R on Nov 8, 2025, 9:12 PM

thread size on this one is 1 5/16-12, that right? trying to match up to a busted lock nut on a bulkhead panel and want to make sure before I order

Answer by: Customer Support on Nov 10, 2025, 6:31 PM

1 5/16-12 is correct. That corresponds to a 1-inch tube OD and uses a Male JIC SAE 37-degree flare thread, built to SAE J514. If your old nut was a 16 JIC bulkhead fitting, this one should match up just fine.

16 BULKHEAD LOCK NUT

Description & Features

Specifications

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Product Questions & Answers (3)