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What size drill do you use for a 1/4-20 tap?

What size drill do you use for a 1/4-20 tap?

A hole that is too large will result in a loose bolt, which will not have 100 percent of its structural strength when fully tightened. For a 1/4-20 bolt, the optimal drill bit size is #7 or 13/64th.

What size hole do I drill for a 1/4 NPT tap?

NPT Tap Drill Chart

Tap Size Drill Size Tap and Drill Set
1/4″ NPT Tap 7/16″ Drill Bit 1/4″ NPT Tap and Drill Set
3/8″ NPT Tap 37/64″ Drill Bit 3/8″ NPT Tap and Drill Set
1/2″ NPT Tap 23/32″ Drill Bit 1/2″ NPT Tap and Drill Set
3/4″ NPT Tap 59/64″ Drill Bit 3/4″ NPT Tap and Drill Set

What is the drill size before tapping for ¼ 20 Unc?

Thread-Forming Taps For example, the recommended drill size for a 1/4-20 UNC thread is a No. 1 (0.228″-dia.)

What is a 1/4 NPT thread?

As a general “rule of thumb” an NPT thread is approximately 1/4″ (0.25”) larger than its “name.” For a 1/4″ NPT fitting the “nominal” OD is 0.533”. NPT fittings are slightly tapered so the “nominal” diameter is the diameter in the middle of the threaded portion, as measured by the top (crest) of the threads.

What is r drill bit?

Drill bit “R” is .339″ in diameter. Hope that helps. danc46 , 09-14-2007 03:39 PM. Registered User. It’s smaller than the Q drill bit and larger than the S drill bit.

What is the tapping drill size for 1 ⁄ 4 BSW thread?

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Dia BSW Model Engineer
7/32 24 4.8, 4.8
1/4″ 20 5.5, 5.5
9/32 20 6.1, 6.5

What is similar to a 5/16 drill bit?

Drill Bit Hole Diameters
Metric Size Fractional Size
11 mm .4331 5/16
12 mm .4724 21/64
13 mm .5118 11/32