CO Looking for Original Acorn Cap Nuts from Factory Round Mirrors - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**cericd** · 08-18-2022, 12:51 PM

I'm looking for a few original acorn cap nuts which were used to attach the original 67-70 round side view mirror heads. I have my originals but they have been painted over so I'm looking for nice originals that are still the original clear zinc finish, also, not rusted or all nicked up by adjustable wrenches.

All of the nuts I've found online are smooth round (no crown) or high crown which is why I'm looking for originals.

The nuts are 7/16" with 1/4"-28 (fine) threads. Here's a pic of my original (painted gold) nut and a pic I found online to show one in the condition I'm looking for.

**michael bustamante** · 08-18-2022, 02:04 PM

ive seen these at ace/truevalue hardware stores

**cericd** · 08-18-2022, 03:50 PM

Thanks. I'll check there too.

Still like to find some originals.

**Grumpy old man** · 08-18-2022, 10:07 PM

This might help .

https://www.mcmaster.com/acorn-nuts/thread-size~1-4-28/

**cericd** · 08-18-2022, 11:38 PM

Quote:

Originally Posted by Grumpy old man

This might help .

https://www.mcmaster.com/acorn-nuts/thread-size~1-4-28/

Thanks Grumpy. Those look interesting. I checked Fastenal and Grainger but forgot about McMaster Carr.

**jaros44sr** · 08-20-2022, 08:37 AM

I've got a box of mirror stuff, do you want me to go through it, should be some nuts in there

**cericd** · 08-20-2022, 02:20 PM

Sure, if you've got some nice originals I'd be interested in them. Mine are nice (no dinged edges) but I'm trying to find unpainted ones. Thanks!

**jaros44sr** · 08-21-2022, 09:28 AM

Ok let me look, and see what I find

**cericd** · 08-24-2022, 09:03 PM

Bump, still looking for these.

**ThreeQuarter** · 08-26-2022, 10:56 AM

I found these a few weeks ago at Menard’s.

**ThreeQuarter** · 08-26-2022, 11:11 AM

Side profile. Is this the crown you’re looking for, or is this what’s you’re calling smooth?

**cericd** · 08-26-2022, 11:21 AM

That’s what the websites I ran across were referring to as “smooth”. I’m looking for ones with an identical profile to my originals. They seem to be most often called “low crown”. There are also “high crown” versions with a taller, pointier head. Also, hoping to find them with less of a polished look.

**Accelo** · 08-26-2022, 11:31 AM

I likely threw my originals out with the used up mirrors.
I understand you want identical.
Will need some measurement. Like total height and depth of the hex and the hex size.
If you find too shinny it's easy to dull them down in a shaker or tumbler for shells.

I could make you a couple but the finish would be raw steel. Not ideal.
Cheers

From the mcmaster.com site.

**cericd** · 08-27-2023, 01:02 AM

Bump

Still looking for some nice original, unpainted side mirror acorn nuts.

**cericd** · 08-31-2023, 05:35 PM

Found some.

1. Off a NOS 3960511 mirror (assume it's correct)
2. Modern Replacement (slightly shorter than other two but has acorn shape instead of smooth rounded top. Shoulder height looks the same as the painted one. I'd imagine GM had multiple sources for this nut over the lifecycle of these trucks)
3. Off my truck (assume it's original but painted)

08-18-2022, 12:51 PM	#1
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Looking for Original Acorn Cap Nuts from Factory Round Mirrors I'm looking for a few original acorn cap nuts which were used to attach the original 67-70 round side view mirror heads. I have my originals but they have been painted over so I'm looking for nice originals that are still the original clear zinc finish, also, not rusted or all nicked up by adjustable wrenches. All of the nuts I've found online are smooth round (no crown) or high crown which is why I'm looking for originals. The nuts are 7/16" with 1/4"-28 (fine) threads. Here's a pic of my original (painted gold) nut and a pic I found online to show one in the condition I'm looking for. Attached Images __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-18-2022, 02:04 PM	#2
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,862	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors ive seen these at ace/truevalue hardware stores __________________ 1967custom

08-18-2022, 03:50 PM	#3
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Thanks. I'll check there too. Still like to find some originals. __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-18-2022, 10:07 PM	#4
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors This might help . https://www.mcmaster.com/acorn-nuts/thread-size~1-4-28/ __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

08-20-2022, 08:37 AM	#6
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors I've got a box of mirror stuff, do you want me to go through it, should be some nuts in there __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

08-20-2022, 02:20 PM	#7
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Sure, if you've got some nice originals I'd be interested in them. Mine are nice (no dinged edges) but I'm trying to find unpainted ones. Thanks! __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-21-2022, 09:28 AM	#8
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Ok let me look, and see what I find __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

08-24-2022, 09:03 PM	#9
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Bump, still looking for these. __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-26-2022, 10:56 AM	#10
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors I found these a few weeks ago at Menard’s. Attached Images __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

08-26-2022, 11:11 AM	#11
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Side profile. Is this the crown you’re looking for, or is this what’s you’re calling smooth? Attached Images __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

08-26-2022, 11:21 AM	#12
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors That’s what the websites I ran across were referring to as “smooth”. I’m looking for ones with an identical profile to my originals. They seem to be most often called “low crown”. There are also “high crown” versions with a taller, pointier head. Also, hoping to find them with less of a polished look. __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-26-2022, 11:31 AM	#13
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,299	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors I likely threw my originals out with the used up mirrors. I understand you want identical. Will need some measurement. Like total height and depth of the hex and the hex size. If you find too shinny it's easy to dull them down in a shaker or tumbler for shells. I could make you a couple but the finish would be raw steel. Not ideal. Cheers From the mcmaster.com site. Attached Images

08-27-2023, 01:02 AM	#14
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Bump Still looking for some nice original, unpainted side mirror acorn nuts. __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872

08-31-2023, 05:35 PM	#15
cericd Senior Member Join Date: Jan 2012 Location: Texan, back in TX Posts: 2,155	Re: Looking for Original Acorn Cap Nuts from Factory Round Mirrors Found some. 1. Off a NOS 3960511 mirror (assume it's correct) 2. Modern Replacement (slightly shorter than other two but has acorn shape instead of smooth rounded top. Shoulder height looks the same as the painted one. I'd imagine GM had multiple sources for this nut over the lifecycle of these trucks) 3. Off my truck (assume it's original but painted) Attached Images __________________ Chris My 1970 SWB C/10 - https://67-72chevytrucks.com/vboard/...d.php?t=534872



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