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Discussion Starter · #1 ·
Hello at all. My wheel house on both sides are damaged. I saw missing screws but size is unclear for my. We have metric in europe. Can anybody tell me the right size and threat
pinch. Thanks


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That is a good question. The assembly manual doesn't give you specifications. I'd like to find the old GM catalog that had all that listed.

Mine is not at home but I can check tomorrow. Educated guess ... 5/16-18.
 

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just those 4 bolts, I think those are actually 2 different sizes. 1&2 on the wheelwell fender should be the same and 3&4 should be also the same. any member here with a '71 should be able to pull that information shortly

@87next2last1 has books
@rushgator has a '72


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Good Morning @renek74
Page 215 of OPGI 2021 Chevelle & El Camino Restoration Catalog.
Their website is being refreshed this hour until 2 AM, so I cannot post links. (Available now)
* To connect inner fender to fender, catalog shows one set of 28 J bolts and nuts part # CH9210 64-72
Inner Fender Hardware, 1964-72 Chev/El Cam/Monte/GTO/ Lem/Temp @ OPGI.com

* Fender to cowl 3/8 x 1-1/2" with SEM washer flat tip part # CH32694 (CH33306 10 pack)
Bolt, Fender to Cowl, 1959-93, w/Sems Washer @ OPGI.com

* Fender to cowl 5/16 x 7/8" with SEM washer flat tip part # CH32696 (CH33308 10 pack)
Bolt, Hex Head, 1959-93, w/Sems Washer @ OPGI.com

Unfortunately their site did not have the threads per inch count.

My inner fender to fender are wrong, so I will likely pick up a set from OPGI soon.
 

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Discussion Starter · #6 ·
just those 4 bolts, I think those are actually 2 different sizes. 1&2 on the wheelwell fender should be the same and 3&4 should be also the same. any member here with a '71 should be able to pull that information shortly

@87next2last1 has books
@rushgator has a '72


View attachment 144240

All screws have same size but sometimes leght is different....
 

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Screws are not the same . 1 &2 are sheetmetal screws ( tapered point) with I believe a 9/16" head. No washer , the head has a washer attached. 3 & 4 are bolts 9/16 head (Not tappered and same thread te entire length). 3 & 4 also have a "cupped" washer - about 2 inch diameter. Good luck finding them .
 

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3/8 bolts are 16 threads per inch, 5/16 ones are 18 TPI
 

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OOPS - 3&4 do NOT get the cupped washers, they get flat fender washers. I used cupped on my 72 because the sheetmetal on the fender liner was cracking between the holes.

The cupped washers are used on the fender liner bolts that are directly above the top of the wheel. Those bolts are machine thread bolts with a flat end.
 

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Discussion Starter · #10 ·
3/8 bolts are 16 threads per inch, 5/16 ones are 18 TPI
UNC screws with 18 not work, now I have ordered 5/16 UNF with also 18TPI. WE will see...
 

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Discussion Starter · #12 ·
UNF, 5/16 is 24 TPI
in Germanys shop 5/8 Zoll - 18 x 1 1/2 Zoll Länge 38,10 mm Sechskantschraube UNF

5/8 Zoll - 18 x 1 1/2 Zoll Länge 38,10 mm Sechskantschraube UNF
Zollschraube mit amerikanischem Feingewinde UNF
18 Gewindegänge per Zoll
ASME B 18.2.1
ähnl. DIN 933, Vollgewinde
Stahl Grade 5 (8.8)

Länge ohne Kopf 1 1/2 Zoll = 38,10 mm
Gewindedurchmesser 15,88 mm

Schlüsselweite 15/16 Zoll


in English:

5/8 inch - 18 x 1 1/2 inch length 38.10 mm hex screw UNF
Inch screw with American fine thread UNF
18 threads per inch
ASME B 18.2.1
similar DIN 933, full thread
Steel grade 5 (8.8)

Length without head 1 1/2 inch = 38.10 mm
Thread diameter 15.88mm

Width across flats 15/16 inches


it´s strange....
 

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Hello at all. My wheel house on both sides are damaged. I saw missing screws but size is unclear for my. We have metric in europe. Can anybody tell me the right size and threat
pinch. Thanks


View attachment 144238

I use the next size wider and in stainless. Those are self-tapping screws. If you use the original size, I doubt they will tighten up. If you have access to a spot welder I would tach some nuts onto those brackets.

When I'm dealing with loose fitting screws, I go to the next larger size in metric.

The fender screws take those clip-on nuts. Being it is on the fender I wouldn't tach nuts in that area.
 
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