The LMC clearance hole also can be calculated by adding the diameter of the fastener and the diameter of the fastener head and then dividing the sum by two. This method of selecting the LMC clearance hole size is a rule of thumb that will yield the largest hole that will fit under the head of the fastener.
What size hole should I drill for a 3/8 bolt?
So for a 3/8″ bolt, it’s simple – you drill a 3/8″ hole. This is a rare case where you want the hole to be somewhat larger than the bolt diameter, to allow some shifting and settling. For a 3/8″ bolt the hole should be 1/2″ or 5/8″ diameter.
What size hole do I drill for a 3/8 bolt?
Most drill charts recommend a 5/16 drill for a 3/8-16 bolt.
What size hole do I need for a 3/8 bolt?
For a 3/8″ bolt the hole should be 1/2″ or 5/8″ diameter. You must use a fender washer under the nut.
What size hole do you need for a 3/4 bolt?
Nominal Hole Dimensions
| Bolt Diameter | Hole Dimensions – Standard Diameter | Hole Dimensions – Long Slot (Width x Length) |
|---|---|---|
| 3/4 | 13/16 | 13/16 x 1 7/8 |
| 7/8 | 15/16 | 15/16 x 2 3/16 |
| 1 | 1 1/16 | 1 1/16 x 2 1/2 |
| >= 1 1/8 | d + 1/16 | (d + 1/16) x (2.5 x d) |
What drill bit do I use for a 3/8 tap?
| To Tap This Size Screw Or Bolt: | Use This Drill Bit: | (Closest Fractional:) |
|---|---|---|
| 8mm-1.00mm | 7.1mm | – |
| 5/16-32 NEF | 9/32″ | 9/32″ |
| 9mm-1.25mm | 7.9mm | – |
| 3/8-16 NC | 5/16″ | 5/16″ |
What kind of pressure should be applied to a drill?
Apply moderate even pressure to the drill during the drilling operation. If excessive pressure is required to make the bit cut then the bit is dull and needs to be sharpened. 5. Maintain good balance at all times when drilling.
What size bolt fits a 3/8 hole?
For a 3/8″ bolt the hole should be 1/2″ or 5/8″ diameter.
What size hole do I drill for a 3/8 lag bolt?
Lag Screw Pilot Hole Diameters
| Nominal Diameter of Lag Bolt, inches | Shank (Unthreaded) Portion, inches | Diameter of Pilot Hole, inches (Thread Portion) |
|---|---|---|
| 3⁄8 | 3⁄8 | 15⁄64 |
| 7⁄16 | 7⁄16 | 9⁄32 |
| 1⁄2 | 1⁄2 | 5⁄16 |
| 9⁄16 | 9⁄16 | 23⁄64 |
What size hole for 3/8″ bolt?
Most drill charts recommend a 5/16 drill for a 3/8-16 bolt. Cutting holes that are smaller will leave more material for the tap to cut out, risking tap breakage.
What size drill bit do I need for a 1/2 bolt?
Select a drill bit 1/32 inch larger than the bolt diameter for a tight fit hole or a drill bit 1/16 inch greater than the bolt diameter for a loose fitting hole. What size hole do I need for a 1/2 bolt?
What size drill bit do I need to remove a tap?
Choose the right tool before you start. Most drill charts recommend a 5/16 drill for a 3/8-16 bolt. Cutting holes that are smaller will leave more material for the tap to cut out, risking tap breakage. Drilling larger holes will result in weaker threads, increasing the possibility of stripping them.
What happens if you cut a small hole in a tap?
Cutting holes that are smaller will leave more material for the tap to cut out, risking tap breakage. Drilling larger holes will result in weaker threads, increasing the possibility of stripping them. The material you are cutting also helps determine the size of hole you need.
