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DZUS 121J-530-Z3CT

Part# AJ5-30
MFR Model# D4-AJ5-30
Zinc Electroplated121J-530-Z3C.3125.125.300GA5-312, 350, 375 GP5B, GH5 SR5SS SX-510SSS5A200, 225, 250, 275AJ5-30


Download the Application Chart (PDF)

CAD Plated fasteners are no longer available due to enviromental reasons.

( * ) :No longer available after our current stock is depleted. Please order next longer size.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

In The Box

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Reference Chart


Dzus fastener worked perfectly as expected.

Calvin H Verified Purchase

DZUS 121J-530-Z3CT

July 23, 2023

This piece was a direct replacement for my H-35 Bonanza cowling.

Bruce V Verified Purchase

DZUS 121J-530-Z3CT

October 11, 2022


August 17, 2020


Lee W
November 10, 2019

Does the job it is designed for

Andrew H
September 7, 2017

I have received aj4-40 i have asked aj5-40 i still need them please send me them if required Ask for my crédit card no via e mail and l will send you thank you

Gilles D
November 5, 2020

Unfortunately the part supplied was 1mm too short, and so would not lock in. Very disapointing!

Doug J
January 30, 2020

Getting the stud only without the rest of the parts is not helpful. No direction to the crush ring and spring are supplied by your catalog. a seperate listing of these parts rather than a group as they are now and how to get to them is needed.

Michael H
March 2, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: If I order a Dzus fastener, does it come with the appropriate spring?

No, the springs are sold separate.

Q: Are the dimension in inches are in cm?

Dims are in inches.

Q: I own a 1947 Bonanza 35, Dzus part # for the studs are AJ5-30. What is the corresponding Dzus spring part #?

It depends on the total thickness from under the head to the spring. For that stud it would be S5A-200 through 275. There is a chart on the web.

Q: Do these come with the delrin washers/spacers?

No, you can purchase the GP3B separately, its a plastic half grommet.

Q: What snap ring is used to retain Dzus D4-AJ5-30?

You would use an SR5SS snap ring for AJ5 dzus fasteners.

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