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What size hole do I drill for a 1/2 inch bolt?

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What size hole do I drill for a 1/2 inch bolt?

For holes under 1/2 inch, drill a clearance hole that is 1/64 larger. For holes larger then 1/2, drill clearance hole 1/32 larger. You should never be drilling the same dia clearance hole as the screw size.

What is the tap drill size for a .50 UNF hole?

Tap, Drill, & Clearance Hole Sizes Chart

Thread Size Tap-Drill Sizes Clearance Holes
Size Non-Struct (1/64 OS)
1-72-UNF No. 53 No. 43
2-56-UNC No. 50 No. 38
2-64-UNF No. 50 No. 38

How do I choose a drill bit for a tap?

Rules of Thumb A good tap drill is 90\% (± 2 pp) of major diameter for fine threads. For metric V threads, the concept of major minus pitch (i.e., the major or widest diameter of the intended screw in millimeters minus the pitch of the threads of that screw in millimeters per thread) yields a good tap drill diameter.

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What size is a #1 drill bit?

Downloadable versions:

Drill size Diameter (in) Diameter (mm)
1 mm 0.0394 1.0000
#60 0.0400 1.0160
#59 0.0410 1.0414
#58 0.0420 1.0668

What size is I drill bit?

Bit size reflects the diameter of the body. Some projects call for specific drill bit sizes, but a bit set that includes sizes from 1/16 inch to 1/4 inch will work for many jobs around the home and workshop. You can add larger bits — 5/16-inch, 3/8-inch, 7/16-inch and 1/2-inch bits — if you need them.

What is UNF thread size?

UNF Thread ANSI/ASME B1. 1

Nominal Diameter Major Diameter Inch Pitch mm
3/4″ – 16 UNF 0.750 1.587
7/8″ – 14 UNF 0.875 1.814
1″ – 12 UNF 1.000 2.117
1 1/8″ – 12 UNF 1.125 2.117

What size is a number 25 drill?

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
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What size drill bit do I need for a 1 inch tap?

Nominal Size (inches) T P I Tapping Drill Size
1 inch 11 30.75 mm
1-13/64″
1-1/4″ 11 39.50 mm
1-35/64″

What size is a number 40 drill bit?

Drill Bit Size Chart

Size Decimal Equivalent Decimal Equivalent
.40 mm 0.0157 0.3465
78 0.016 0.348
.42 mm 0.0165 0.3504
.44 mm 0.0173 0.3543

What size is a 12mm drill bit in inches?

Metric Tap and Drill Bit Size Table

Tap Metric Drill US Drill
10mm x 1.25 8.9mm 11/32″
10mm x 1.0 9.1mm –
12mm x 1.75 10.5mm –
12mm x 1.5 10.7mm 27/64″

How do you calculate tap drill size?

How to Calculate Tap Drill Size. Apply the numbers to the formula using an 84 percent thread depth. The formula would be: Dh = 0.252 — 0.0130 (84/20) = 0.0130 (4.2) = 0.252 — 0.0546 = 0.1974 inches. Find the nearest drill bit size in 1/16ths of an inch. Multiply 0.1974 times 16 and the answer is 3.15.

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What is the standard size of 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 is the diameter of a drill bit?

ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.

What are drill bit sizes?

Metric drill bit sizes. Metric drill set, 1.0–6.0 mm by 0.1 mm, jobber length. The case that holds them in an indexed…

  • Fractional-inch drill bit sizes. Fractional-inch drill bit sizes are still in common use in the United States and in any…
  • Number and letter gauge drill bit sizes. Number drill bit gauge sizes range from size 80 (the smallest) to size…
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