Inch Tap Drill Quick Reference

Printable shop wall chart: Inch Tap Drill Quick Reference. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.

Last reviewed 2026-09-10 · reference FG-7F64D5 · Report an error on this sheet

Thread	Tap drill	Decimal	Thread	Tap drill	Decimal
#4-40	#43	0.0890	1/2-13	27/64	0.4219
#6-32	#36	0.1065	1/2-20	29/64	0.4531
#8-32	#29	0.1360	9/16-12	31/64	0.4844
#10-24	#25	0.1495	9/16-18	33/64	0.5156
#10-32	#21	0.1590	5/8-11	17/32	0.5312
1/4-20	#7	0.2010	5/8-18	37/64	0.5781
1/4-28	#3	0.2130	3/4-10	21/32	0.6562
5/16-18	F	0.2570	3/4-16	11/16	0.6875
5/16-24	I	0.2720	7/8-9	49/64	0.7656
3/8-16	5/16	0.3125	7/8-14	13/16	0.8125
3/8-24	Q	0.3320	1-8	7/8	0.8750
7/16-14	U	0.3680	1-12	59/64	0.9219
7/16-20	25/64	0.3906

For hard materials or deep holes a slightly larger drill (less thread) reduces tap breakage. Thread-forming taps need larger drills: use the tap maker chart.

These tables carry the same figures as the printed sheet below.

The printed sheet

25 x 36 inch poster version

For the full-size shop poster, tell us where to send it.

See an error on this sheet?

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Text version of this sheet

TAP DRILL

TAPPED THREAD

Tap drill sizes for about 75% thread · decimal equivalents in inches

Thread

Tap drill

Decimal

Thread

Tap drill

Decimal

#4-40

#43

0.0890

1/2-13

27/64

0.4219

#6-32

#36

0.1065

1/2-20

29/64

0.4531

#8-32

#29

0.1360

9/16-12

31/64

0.4844

#10-24

#25

0.1495

9/16-18

33/64

0.5156

#10-32

#21

0.1590

5/8-11

17/32

0.5312

1/4-20

0.2010

5/8-18

37/64

0.5781

1/4-28

0.2130

3/4-10

21/32

0.6562

5/16-18

0.2570

3/4-16

11/16

0.6875

5/16-24

0.2720

7/8-9

49/64

0.7656

3/8-16

5/16

0.3125

7/8-14

13/16

0.8125

3/8-24

0.3320

1-8

7/8

0.8750

7/16-14

0.3680

1-12

59/64

0.9219

7/16-20

25/64

0.3906

For hard materials or deep holes a slightly larger drill (less thread) reduces tap breakage. Thread-forming taps need larger drills: use the tap maker chart.

The Fastener App | TheFastenerApp.com

Fastener Guide reference FG-7F64D5 · thefastenerapp.com/fastener-guide/wall-charts/inch-tap-drill-quick-reference · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Scan the label, the item lands in the shopping cart

Your rep or the customer scans a barcode label or they can select items from your store. No part number to remember, no phone call to your counter, no one re-keying anything.

Built into the app, not a separate device or an add-on

Works on any phone camera, or a handheld scanner if they have one

Scans your competitors’ barcode labels too^*

Customers and employees can place orders 24 hours a day, even after hours, and the orders will be waiting for you when you get there in the morning. You can choose to be notified every time an order is placed, whether you’re at the office or not. It gives you greater visibility into your company’s ordering activity.

* Simply cross the number in the system to ours, and we can walk you through the process.

See what every customer buys from you

Every account gets a category chart: share of dollars, share of times ordered and share of pieces. Your reps see what each customer buys from you, and the categories they are buying somewhere else stand out.

Share of dollars

Fasteners37%$69,879

Electrical10%$19,152

Fleet and Automotive7%$12,293

Hardware and Building Supplies5%$10,243

Tools and Equipment5%$9,811

Cutting Tools and Metalworking5%$9,740

Plumbing5%$8,865

All other25%$46,410

Share of times ordered

Fasteners44%355

Electrical12%94

Fleet and Automotive7%53

Tools and Equipment6%48

Cutting Tools and Metalworking4%36

Pneumatics4%34

Hardware and Building Supplies4%33

All other20%162

Share of pieces

Fasteners75%486,316

Fleet and Automotive6%38,905

Electrical5%31,100

Hardware and Building Supplies3%19,775

Sealing3%17,704

Abrasives3%17,251

General MRO2%16,133

All other4%23,770

Sample report from our demo store.

Sales rep territory management

The time planner splits each rep’s month by how much every customer spends. A customer that is 20% of the rep’s business gets about 35 hours a month, about 8 hours a week, and the rep’s week is laid out for them.

Share of the rep’s business

Summit Precast LLC20.2%

Brunswick Galvanizing Inc.14.6%

Talleyrand Signs LLC8.0%

Mayport Tool & Die Inc.7.8%

Eagle Mechanical LLC7.2%

Premier Electric Group5.9%

Tallahassee Packaging LLC3.7%

Coastal Maintenance Group3.3%

All others (64 customers)29.4%

Time each customer deserves

Customer	Hours a month	Hours a week
Summit Precast LLC	35.0	8.1
Brunswick Galvanizing Inc.	25.3	5.8
Talleyrand Signs LLC	13.9	3.2
Mayport Tool & Die Inc.	13.5	3.1
Eagle Mechanical LLC	12.5	2.9
Premier Electric Group	10.2	2.4
Tallahassee Packaging LLC	6.4	1.5
Coastal Maintenance Group	5.7	1.3
All others (64 customers)	51.0	11.8

Sample plan from our demo store: 173 hours a month, all selling time.

Nearly 3,000 real product photographs, covering more than 27,000 SKUs.

We had a professional photographer come in and spend weeks in our warehouse, photographing and producing real, high-resolution photos of many of our products. This work is ongoing, and many more products will be added. Right now the photographs cover more than 27,000 SKUs. We also have AI image generation capabilities.