How do you size a countersink bit?
Table of Contents
How do you size a countersink bit?
You will want to choose a countersink that is larger than the bolt size of the hole. Countersink diameter = 1.5 x Bolt Size Hole Diameter. Example: 1/4″-20 Bolt – Multiple the diameter (. 250) x 1.5 = 0.375.
What drill bit do you use to countersink?
We’ll look at what it does, why you need one, and what size countersink bit you need….Countersink Size Chart.
Drill Bit Size | Screw Size for Hardwood | Screw Size for Softwood |
---|---|---|
⁹/₆₄” | #10 | #12 |
How do you know what size countersink to get?
> A simple rule of thumb is to choose a countersink which is 50\% larger than the diameter of the hole. > Countersink diameter = 1.5 x Bolt Size (hole) diameter. > Example: For a 1/4-20 bolt, multiply the diameter (. 250) x 1.5 = .
Can you countersink with a regular drill bit?
Instead of using a drill bit that both drills the pilot hole and creates a countersink divot, you can opt to make a pilot hole with a regular drill bit and then swap your bit for a countersink drill bit to create the countersink. Once that’s done, switch the drill bit for a screw bit and screw in your screw.
How do you measure countersink depth?
> A simple rule of thumb is to choose a countersink which is 50\% larger than the diameter of the hole > Countersink diameter = 1.5 x bolt size (hole) diameter > Ex: For a 1/4-20 bolt, multiply the diameter (. 250) x 1.5 = . 375. This equates to a 3/8” countersink.
What size countersink bit for wood screws?
Wood Screw Pilot Hole Sizes
Screw Size | Hard Wood | Countersink Size |
---|---|---|
Tapered Bit | ||
#6 | 9/64″ | 5/16″ |
#7 | 5/32″ | 5/16″ |
#8 | 11/64″ | 3/8″ |
What size countersink bit for #12 screw?
Wood Screw Pilot Hole Sizes
Screw Size | Hard Wood | Countersink Size |
---|---|---|
Tapered Bit | ||
#10 | 13/64″ | 7/16″ |
#12 | 7/32″ | 7/16″ |
#14 | 1/4″ | 1/2″ |
What size countersink bit for deck screws?
The 8 and 10 are really for DeckMate size screws. #7 is for the composite deck screws. The smaller the number the smaller the drill bit is too.
What is the standard countersink angle?
82°
Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout the aerospace industry, countersunk fasteners typically have an angle of 100°.
What size countersink bit for #10 screw?
Wood Screw Pilot Hole Sizes
Screw Size | Hard Wood | Countersink Size |
---|---|---|
Tapered Bit | ||
#9 | 3/16″ | 3/8″ |
#10 | 13/64″ | 7/16″ |
#12 | 7/32″ | 7/16″ |