Screwdriver bit Sizes Guide with Charts
A full screwdriver set might seem like it has far more sizes than you will ever need, but then there comes a day where you realize that your screwdriver set is missing a size that you desperately need. It is thus better to buy the sizes that you need most rather than to buy a full set that you later find is incomplete.
Have you ever looked at a screwdriver setand thought “There are more sizes than I’ll ever need” only to read reviews and find out they’re incomplete?
Getting a set that has the sizes you need most can often be more important than buying a “full set” that lacks one or two vital sizes. But how do you know when you have all the necessary sizes?
Below you will find the 5 most common screw head shapes with the various sizes available.
Flat Head Screwdriver Sizes
A flat head screwdriver is also sometimes referred to as a slotted screwdriver. These screwdrivers are the easiest to recognize because of its wedge-shaped end.
| Tip Width (SAE) | Tip Width (Metric) |
|---|---|
| 0.8 mm | |
| 1 mm | |
| 1.2 mm | |
| 1.5 mm | |
| 1.8 mm | |
| 2 mm | |
| 3/32" | 2.5 mm |
| 1/8" | 3 mm |
| 3.5 mm | |
| 5/32" | 4 mm |
| 3/16" | |
| 4.5 mm | |
| 5 mm | |
| 7/32" | 5.5 mm |
| 6 mm | |
| 1/4" | 6.5 mm |
| 5/16" | |
| 3/8" |
Hex Key Screwdriver Sizes
These hex keys are sometimes referred to as Allen wrenches and these screwdrivers usually come in an L-shaped key with no handle. Measurements for the sizes of hex keys are done across the flat parts of the hex.
| Tip Width (SAE) | Tip Width (Metric) |
|---|---|
| .7 mm | |
| .9 mm | |
| 3/64" | 1.2 mm |
| 1.3 mm | |
| 1.5 mm | |
| 1/16" | 1.6 mm |
| 5/64" | 2 mm |
| 3/32" | 2.4 mm |
| 2.5 mm | |
| 7/64" | 2.8 mm |
| 3 mm | |
| 1/8" | 3.2 mm |
| 9/64" | 3.5 mm |
| 5/32" | 4 mm |
| 11/64" | 4.4 mm |
| 4.5 mm | |
| 3/16" | 4.8 mm |
| 5 mm | |
| 13/64" | 5.2 mm |
| 7/32" | 5.5 mm |
| 15/64" | 6 mm |
| 1/4" | 6.4 mm |
| 7 mm | |
| 5/16" | 8 mm |
| 9 mm | |
| 3/8" | 9.5 mm |
| 10 mm | |
| 1/2" | 12.7 mm |
Robertson Screwdriver Sizes
The Robertson drive is commonly referred to as a square drive and is very popular in both electrical and construction fields. Like the Phillips screwdrivers, Robertson drives also make use of a numbering system. Robertson drives have corresponding color codes to make each size easy to identify.
| Color Code | Size # | Fits Screw Sizes |
|---|---|---|
| Orange | #00 | 1-2 |
| Yellow | #0 | 3-4 |
| Green | #1 | 5-7 |
| Red | #2 | 8-10 |
| Black | #3 | 12, 1/4" |
| Brown | #4 | 5/16", 3/8" |
Phillips Screwdriver Sizes
The Phillips screwdriver has become the standard in many different countries. Phillips drives have become a very popular drive when it comes to precision work, that’s why it is used in electronics and laptops. Phillips screwdrivers can be used on many different cruciform screws.
| Phillips # | Tip Width (Metric) | Fits Screw Sizes |
|---|---|---|
| #0000 | 1 mm | |
| #000 | 1.5 mm | |
| #00 | 2 mm | |
| #0 | 2.5 mm | 0-1 |
| #1 | 3 mm | 2-4 |
| #2 | 3.5 mm | 5-9 |
| #3 | 5 mm | 10-14, 16 |
| #4 | 6 mm | 18, 20, 24 |
| #5 | 8 mm | 5/8" and 3/4" (machine screws) |
Torx Screwdriver Sizes
Torx drives are designed to function at higher torques than other screwdriver types and also have a longer lifespan. The Torx drive is sometimes referred to as a star drive due to the resemblance it has with its 6-point star shape. Torx drives have different numbers based upon the different distances between two opposing points.
| Torx Size | Width (SAE) | Width (Metric) |
|---|---|---|
| T1 | .031" | .81 mm |
| T2 | .036" | .93 mm |
| T3 | .046" | 1.10 mm |
| T4 | .050" | 1.28 mm |
| T5 | .055" | 1.42 mm |
| T6 | .066" | 1.70 mm |
| T7 | .078" | 1.99 mm |
| T8 | .090" | 2.31 mm |
| T9 | .098" | 2.50 mm |
| T10 | .107" | 2.74 mm |
| T15 | .128" | 3.27 mm |
| T20 | .151" | 3.86 mm |
| T25 | .173" | 4.43 mm |
| T27 | .195" | 4.99 mm |
| T30 | .216" | 5.52 mm |
| T40 | .260" | 6.65 mm |
| T45 | .306" | 7.82 mm |
| T50 | .346" | 8.83 mm |
| T55 | .440" | 11.22 mm |
| T60 | .519" | 13.25 mm |
| T70 | .610" | 15.51 mm |
| T80 | .690" | 17.54 mm |
| T90 | .784" | 19.92 mm |
| T100 | .871" | 22.13 mm |
screwdriver bit sizes chart
ph00 screwdriver size
screwdriver types
robertson screwdriver size chart
slotted screwdriver bit size chart
phillips screwdriver
slotted screw size chart
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