What size hole do you drill for a M8 bolt?

Metric Threads

Thread Drill size for tapping standard metric threads Clearance hole
M5 4.2 5.5
M6 5 6.6
M8 6.8 9
M10 8.5 11

Simply so, Is 5/16 The same as M8? Well, quick answer is no. They are not the same and they are not interchangeable, although they can work under certain circumstances. The most important part is understanding the meaning of M8 and 5/16 to refer to the size of a metric screw or bolt, so then we can see why they aren’t the same thing!

What size drill bit do I need for M8 1.25 tap? Tap Size

Tap Size Drill Size
M8 x 1 7.1mm
M8 x 1.25 6.7mm
M9 x 0.75 8.3mm
M9 x 1 8.1mm

Subsequently, What size drill bit is AQ drill bit?

Drill Bit Size Chart

Size Decimal Equivalent Size
83 0.012 8.30 mm
82 0.0125 21/64″
.32 mm 0.0126 8.40 mm
81 0.013 Q

What drill bit should I use for 8mm?

Metric Tap and Drill Bit Size Table

Tap Metric Drill US Drill
6mm x 1.0 5.2mm
7mm x 1.0 6.1mm 15/64″
8mm x 1.25 6.9mm 17/64″
8mm x 1.0 7.1mm

Is 8mm bigger than 5 16? 8mm = 5/16 inch. 9mm = almost 3/8 inch. 10mm = just over 3/8 inch. … 18mm = just over 11/16 inch.

What size is M8 bolt head?


Size Head Diameter Head Height
M8- 1.25 17.92 4.96
M10-1.50 22.40 6.20
M12-1.75 26.88 7.44
M16-2.00 33.60 8.80

How do you read bolt sizes?

What is a clearance hole?

A clearance hole is a hole through an object which is big enough to enable threads of a screw or bolt to pass through but not the head of the screw or bolt. It allows a screw to pass through it without the threads biting into the material.

How do I know what size my tap is? Tap-drill diameter equals nominal diameter minus thread pitch. I quickly calculate proper tap-drill diameters using this simple formula. Tap-drill diameter equals nominal diameter minus thread pitch. For example, drill size for a 3/8-16 thread is 0.375 0.0625 (pitch) = 0.312 in.

How do you know what size drill bit to use?

The diameter of the hole you drill should be slightly smaller than the diameter of the screw. So, for example, if you’re using a 3.5 mm screw, use a drill bit with a diameter of 3 mm. If you’re using wall anchors as well as screws, the drill bit and anchors should have the same diameter.

What size is a letter R drill bit? Letter Size Drills

Ltr. Dia.
O .316
P .323
Q .332
R .339

What size is a letter q drill bit?

Letter Drill Sizes

Drill Inch mm
N 0.302 7.67
O 0.316 8.03
P 0.323 8.20
Q 0.332 8.43

What does drill size Q mean?

Letter Size HSS Straight Shank Drill Bit – Size Q

Lettered from A-Z (small to large). Used where more precisely sized holes are required in larger sizes than number drills. Ideal for tap drills. 118 degree point, bright finish.

What size is a #29 drill bit?

To Tap This Size Screw Or Bolt: Use This Drill Bit: Decimal Inches
4mm-0.75mm 3.4mm .1338
8-32 NC #29 .1360
8-36 NF #29 .1360
8-40 NS #28 .1405

How deep should a pilot hole be?

Pilot holes guarantee that your screw won’t break off and your wood won’t crack. For most hardwoods, the pilot hole should be at least as large as the screw’s minor diameter. If the screw has deep threads, or the wood is very hard, the pilot hole should be another 1/64-in.

What is M12 inches?

Tap size Basic major dia (mm) Basic major dia (inch)
M10 x 1.25 10mm .3937
M12 x 1.75 12mm .4724
M12 x 1.25 12mm .4724
M14 x 2 14mm .5512

How many MM is a quarter? Coin Specifications

Denomination Cent Quarter Dollar
Diameter 0.750 in. 19.05 mm 0.955 in. 24.26 mm
Thickness 1.52 mm 1.75 mm
Edge Plain Reeded
No. of Reeds N/A 119

• Sep 24, 2019

What is M8 in standard?

Thread Conversion Table

Metric Coarse Metric Fine BSF/BSW
M6 x 1 M6 x 0.75 1/4″
M8 x 1.25 M8 x 1 5/16″
M10 x 1.5 M10 x 1.25 3/8″
M12 x 1.75 M12 x 1.25 1/2″

How do I know what size nut and bolt to get? A typical rule of thumb . . . Use a bolt diameter that is 1.5 – 2.5 times (up to three times) the thickness of the thinner material you are bolting together. So, for 1/8″ material, a 1/4″ diameter is often a good bolt choice. For 1/4″ thick material, perhaps a 3/8″ or 1/2″ bolt.

How do you read metric bolt sizes?

Taking a closer look at this description, let’s explore its meaning:

  1. M = This designates the fastener is a metric size.
  2. 10 = The nominal diameter in millimeters.
  3. 1.0 = The thread pitch, or distance between threads, in millimeters.
  4. 20 = The fastener’s length, in millimeters.

How can you tell if a bolt is metric or standard? How long is that bolt? Most bolts come in pretty uniform lengths; and this is a good way to determine if the bolt is metric or standard. Measure the bolt length (not including the cap), and see if it’s closer to a fraction of an inch, or a nice and round millimeter length that ends in 5 or 0.

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