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What size drill bit is letter?

Letter Size Drills

Ltr. Dia.
G .261
H .266
I .272
J .277

Why are some drill sizes letters?

Letter and numbered drill bits were developed to make up the gaps in between metric and fractional sizes. The most common use is for using taps. There will not be an exact match for fractional sizes but you can refer them to closest fractional bit that is larger than the numbered bit.

What size is a #25 drill bit?

To Tap This Size Screw Or Bolt: Use This Drill Bit: Decimal Inches
10-24 NC #25 .1495
3/16-32 NS #22 .1570
10-32 NF #21 .1590
5mm-0.90mm 4.2mm .1653

What size is a 9mm drill bit?

To Tap This Size Screw Or Bolt: Use This Drill Bit: Decimal Inches
9mm-1.00mm 8.1mm .3189
9mm-0.75mm 8.3mm .3268
3/8-24 NF Ltr.Q .3320
10mm-1.50mm 8.7mm .3425

What size is a number 21 drill bit?

Wire Gauge (Number) M2 High-Speed Steel Drills – Premium Swift Bore

Product No. 01421
Drill Size No. 21
Decimal Inches 0.1590
For Tap Size 10-32 NF (National Fine SAE)
Weight 0.015 lbs

What size is a #11 drill bit?

California’s Railroad to the U.S. 1861 – 1996

Drill Bit Equivalent Sizes
No. Drill Thou. Inch Metric mm
11 191 4.85
12 189 4.80
13 185 4.70

Can I use a 3/8 drill bit for 10mm?

3/8″ bits have a nominal size being just ever so slightly under 10mm. You can’t drill a hole of any size and put something in it the same size. It must be a bit smaller than the hole you drill.

What size drill bit is 11mm?

How thick is 5 32 inches?…What is a 5/16 drill bit equal to?

Drill Bit Hole Diameters
Metric Size Fractional Size
10 mm .3937 19/64
11 mm .4331 5/16

What is the standard size of a drill bit?

Another size related feature to focus on is the size of the drill bit, as we mentioned earlier. The most common drill bit sizes are 1/16 to 1/4″ and most large sets will also include increments up to 1/2″ thick.

What are the sizes of drill bits?

Drill Bit Lengths Jobber-length drill bits are the most common, with a length somewhere between 9 to 14 times the diameter. Screw-machine-length drills arethe shortest available standard sized bits. Aircraft-length drills are extended length drill bits that are manufactured in fixed length such as 4, 6, 8, 12, 18, 24-inch bits, rather than proportional lengths.

How big is a drill bit?

Drill bit sizes are written down on paper and etched onto bits as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch . Below is a chart providing the decimal-fraction equivalents that are most relevant to fractional-inch drill bit sizes (that is, 0 to 1 by 64ths).

What are the standard drill sizes?

Range 1 (R1) is shortest in length, more common for sizing production tubing or casing, and ranges from 18 to 22 ft. Range 2 (R2) is considered the standard length for drill pipe and ranges from 27 to 31 ft. Range 3 (R3) is common in casing and also deployed in deep water drilling applications.