Drill Bit Size Compatibility Chart
Use this quick-reference to match anchors to the correct drill bit. Many anchor families follow the “same-size rule” (anchor diameter = drill bit size). For others, refer to the exception tables below.
Same-Size Rule (Anchor Ø = Drill Bit Ø): Wedge Anchors, Tapking® HD Concrete Screws, Mungo Anchors (metric: drill bit = anchor diameter in mm), Sleeve Anchors, Split-Fast Anchors, Pin Drive Anchors, Hammer Drive Anchors.
Tapking® SD & Commercial Concrete Screws
(Countersunk/hex concrete screws that require a smaller pilot.)
| Screw Size |
Drill Bit Size |
| 3/16" |
5/32" |
| 1/4" |
3/16" |
Drop-In Anchors
| Anchor Size |
Drill Bit Size |
| 1/4" |
3/8" |
| 3/8" |
1/2" |
| 1/2" |
5/8" |
| 5/8" |
7/8" |
| 3/4" |
1" |
Wood Screw Anchors – Lead Alloy (Plain)
| Anchor Size Range |
Drill Bit Size |
| #6 – #8 |
1/4" |
| #10 – #14 |
5/16" |
| #16 – #18 |
3/8" |
Single Expansion Shield Anchors
| Anchor Size |
Drill Bit Size |
| 1/4" |
1/2" |
| 5/16" |
5/8" |
| 3/8" |
5/8" |
| 1/2" |
7/8" |
| 5/8" |
1" |
Double Expansion Shield Anchors
| Anchor Size |
Drill Bit Size |
| 1/4" |
1/2" |
| 5/16" |
5/8" |
| 3/8" |
3/4" |
| 1/2" |
7/8" |
| 5/8" |
1" |
Lag Screw Expansion Shields (Zinc Alloy) – Short & Long
| Anchor Size |
Drill Bit Size |
| 1/4" |
1/2" |
| 5/16" |
1/2" |
| 3/8" |
5/8" |
| 1/2" |
3/4" |
| 5/8" |
7/8" |
| 3/4" |
1" |
Machine Screw Anchors
| Anchor Thread |
Drill Bit Size |
| #6-32 / #8-32 |
5/16" |
| #10-24 / #10-32 |
3/8" |
| 1/4" |
1/2" |
|
