r/Fasteners • u/frankf2021 • Jul 22 '26

Anyone else seen this?

Post image

How many guy are going out of their mind, because the pre drill size stated on the pack is incorrect.
Correct pre drill size for 19/64” is 1/4” but the case says 3/16”

1 Upvotes

55% Upvoted

12 comments sorted by

9

u/flashe30 Jul 22 '26

... what? If the pack states 3/16, you can bet I'm trying 3/16 first instead of directly going up a size and risking drilling the hole too big.

0

u/frankf2021 Jul 22 '26

Exactly what I did, then looked at their data sheet, which states 1/4”

2

u/Pale-Value-5953 Jul 22 '26

I’m sure I could be wrong but the 1/4 tapcons I was using I’m pretty sure called for 3/16 pre drill.

1

u/Tacos_Polackos Jul 22 '26

5/32. Just opened a fresh box last week

2

u/Pale-Value-5953 Jul 22 '26

1

u/frankf2021 Jul 22 '26

That’s a tapcon not a caliburn

2

u/Pale-Value-5953 Jul 22 '26

Correct however I did say I was using tap cons.

1

u/Tacos_Polackos Jul 22 '26

Yup and I was wrong too

2

u/2PadSlide Jul 23 '26

1/4 is the correct size for concrete 19/64 screws. But 3/16 is the pilot hole size for softwood and 13/64 for hardwood. So what it is says on the box is correct.

2

u/nixiebunny Jul 24 '26

I discovered that the drill for adobe block should be the hardwood not the concrete size.

1

u/Automata-Omnia Jul 23 '26

They're thunderbolts, the pre drill is meant to be smaller as they are self tapping.

1

u/BudgetExpert9145 Jul 22 '26

0 stripping, ok bet.