BIT SIZE CHART

FASTENER-FIRST DRILLING PLAN

What should I drill for this screw or anchor?

Choose fastener, material, and bit set. Get every hole in order.

Fast path: type a supported screw, material, or exact Tapcon size.

Drives the closest-bit evidence.
Check screw depth optional arithmetic only

Calculates penetration and projected poke-through; it does not rate joint strength.
#8 wood screw · Softwood · Join two boardsDefault preview

3-hole plan

Pilot 7/64 in 2.78 mm · exact size is in your 29-piece fractional set
Published guide

Conventional flat-head wood screw · source-scoped straight-bit starting points

LIVE HOLE MAP

See where each size goes

Steps 1–3
TOP BOARD RECEIVING BOARD 1 CLEARANCE · TOP BOARD 2 COUNTERSINK · TOP FACE 3 PILOT · RECEIVING BOARD
Schematic — hole diameters compared, not printed at 1:1.
1 Clearance 11/64 in top board
2 Countersink 3/8 in top face
3 Pilot 7/64 in receiving board

Step 3 · Pilot · receiving board · 7/64 in. In your 29-piece fractional set.

Drill in this order

3 operations
  1. 1
    Clearancetop board
    11/64 in 4.37 mm
    Drill through the top board.Lets the screw shank pass so the head can pull the two pieces together.
    Your set has 11/64 in
  2. 2
    Countersinktop face
    3/8 in 9.53 mm
    Stop when the actual screw head sits flush.Opens the surface for a conventional flat head; cutter diameter is published, depth is fitted to the actual head.
    Your set has 3/8 in
  3. 3
    Pilotreceiving board
    7/64 in 2.78 mm
    Drill to the intended threaded penetration.Creates room for the screw core while leaving material for thread engagement.
    Your set has 7/64 in

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This tool provides source-scoped drilling starting points and exact manufacturer mappings for the products it names. Inspect the workpiece, use the current product instructions, and verify dimensions before drilling. It does not provide structural, load-capacity, code-compliance, or professional engineering advice.

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