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What Size Pilot Hole to Drill for 3/8 inch Diameter Screw  

Updated 02/17/2026 | Published 06/13/2024

Question:

mounting stabilizer jacks on single axle trailer and 3/8 screws. What size pilot hole should I drill?

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Expert Reply:

If the screws are fastened with nuts then a 3/8 inch size hole would work fine but if it's a self tapping screw I'd go with a pilot hole that's about 1/16 inch smaller in diameter.

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Jameson C
Jameson C. profile picture
Etrailer Expert

Jameson C.

2/17/2026

Hey, how did the pilot hole size work out when you mounted the stabilizer jacks on your trailer? Sharing what you found could help others setting up the same jacks.

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