Part# 12-05541
MFR Model# A3


The Zenith blind rivets are made from quality alloys, and are batch tested by Zenith Aircraft Company for shear strength before being shipped.

These rivets are corrosion resistant, and the stem becomes locked in after being set. Also, not many different lengths are required for different diameters or thicknesses. In the Assembly Instructions, they are designated as A4 (1/8) and A5 (5/32).

They have a design shear strength of 130 lbs. and 220 lbs. respectively. Use only Zenith rivets supplied with the kit.

Zenith Aircraft Company has developed a unique process for setting blind rivets, which requires custom rivet heads. The process uses flush-type rivets, where the flush rivet head is formed into a domed-head by the riveting process. This provides an permanent tight finish to all set rivets. To accomplish this, the riveter heads must be ground (machined) with a concave dome (see diagram). Only 1/8" (A4) and 5/32" (A5) rivets are required to assemble the kit.

Zenair blind rivets for the ZENAIR Riveting System
ZENAIR blind (or pulled) rivets have been used to construct the all-metal Chris Heintz designs since the 1970s, and make riveting a quick and easy process! The ZENAIR riveting system forms the rivet head as the blind rivet is pulled, providing a low profile dome finish and high shear strength. Fast installation, simple tools and low cost make this a popular riveting system with homebuilders!
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5 star

Roy M Verified Purchase


March 25, 2023

Aircraft Spruce saved my bacon. These rivets work in inaccessible areas which makes them practically invaluable to me when completing a project.

Roy M Verified Purchase


February 13, 2023

Glad these are made available, Paypal, Canada Post fast easy and good shipping price from Spruce!

Mark S
August 31, 2020

Rivets are great. used them in a zenith as per the plans and are perfect. A&S service was awesome.

July 6, 2020

good quality

Darrin T
April 23, 2020

Exactly what I needed. Gets the job done with the specially machined rivet heads fo Zenith aircraft.

Ray W
March 31, 2019

I have used the standard blind rivets hundreds of times, but when it comes to structural its good to know that these meet a shear test.

Michael M
August 10, 2018

I ordered 200 each,delivered as promised!! Shame they are so exspensive,Ill need several thousand

Bob E
September 22, 2017

Ok, but Cheaper from Zenith Factory and shipping is cheaper.

Mark S
December 20, 2020

as per Zenith construction standard CS# 400 the apex rivets will work reference #1604-0412 for A4 and #1604-0514 for A5 they are much cheaper.

Adam V
May 25, 2020


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: Are these Zenair blind rivets made of aluminum alloy or stainless steel?

These are made of 6061T6 aluminum.

Q: Are these the same rivets as avex?

Yes. Per they vendor they are Avex rivets. Avex is a large rivet manufacturer, and these Avex rivets were specifically selected by Zenith. I'm not sure what Avex model/part number they use.

Q: Do they have countersunk heads?

Yes these are countersunk.

Q: which ones are the 1/8 ....#30 rivets ?

12-05538 would be the 1/8 inch rivet.

Q: What is the angle of the counter sink heads?

Per Vendor: We just use a flat head to pull the A3 rivets and not a countersunk head. The A3s are used for the nutplates and will be a flush rivet.

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