CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

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Materials

Design

Processes

Units

Formulas

Math
 
Size Basic Major Diameter Basic Pitch Diameter Minor Diameter Minor Dia. Area Tensile Stress Area
Size Primary Size Secondary External Thread Internal Thread
inch inch inch inch inch inch sq. inch sq. inch
1/4*   0.2500 0.2175 0.1905 0.1959 0.0269 0.0318
5/16   0.3125 0.2800 0.2530 0.2584 0.0481 0.0547
3/8   0.3750 0.3425 0.3155 0.3209 0.0755 0.0836
7/16*   0.4375 0.4050 0.3780 0.3834 0.1090 0.1187
1/2*   0.5000 0.4675 0.4405 0.4459 0.1486 0.160
9/16   0.5625 0.5300 0.5030 0.5084 0.194 0.207
5/8   0.6250 0.5925 0.5655 0.5709 0.246 0.261
  11/16 0.6875 0.6550 0.6280 0.6334 0.304 0.320
3/4*   0.7500 0.7175 0.6905 0.6959 0.369 0.386
  13/16* 0.8125 0.7800 0.7530 0.7584 0.439 0.458
7/8*   0.8750 0.8425 0.8155 0.8209 0.515 0.536
  15/16* 0.9375 0.9050 0.8780 0.8834 0.598 0.620
1*   1.0000 0.9675 0.9405 0.9459 0.687 0.711
  11/16 1.0625 1.0300 1.0030 1.0084 0.782 0.807
11/8   1.1250 1.0925 1.0655 1.0709 0.882 0.910
  13/16 1.1875 1.1550 1.1280 1.1334 0.990 1.018
11/4   1.2500 1.2175 1.1905 1.1959 1.103 1.133
  15/16 1.3125 1.2800 1.2530 1.2584 1.222 1.254
13/8   1.3750 1.3425 1.3155 1.3209 1.348 1.382
  17/16 1.4375 1.4050 1.3780 1.3834 1.479 1.51
11/2   1.5000 1.4675 1.4405 1.4459 1.62 1.65
  19/16 1.5625 1.5300 1.5030 1.5084 1.76 1.80
15/8   1.6250 1.5925 1.5655 1.5709 1.91 1.95
  111/16 1.6875 1.6550 1.6280 1.6334 2.07 2.11
13/4   1.7500 1.7175 1.6905 1.6959 2.23 2.27
  113/16 1.8125 1.7800 1.7530 1.7584 2.40 2.44
17/8   1.8750 1.8425 1.8155 1.8209 2.57 2.62
  115/16 1.9375 1.9050 1.8780 1.8834 2.75 2.80
2   2.0000 1.9675 1.9405 1.9459 2.94 2.99
  21/8 2.1250 2.0925 2.0655 2.0709 3.33 3.39
21/4   2.2500 2.2175 2.1905 2.1959 3.75 3.81
  23/8 2.3750 2.3425 2.3155 2.3209 4.19 4.25
21/2   2.5000 2.4675 2.4405 2.4459 4.66 4.72
  25/8 2.6250 2.5925 2.5655 2.5709 5.15 5.21
23/4   2.7500 2.7175 2.6905 2.6959 5.66 5.73
  27/8 2.8750 2.8425 2.8155 2.8209 6.20 6.27
3   3.0000 2.9675 2.9405 2.9459 6.77 6.84
inch inch inch inch inch inch sq. inch sq. inch
Size Primary Size Secondary Basic Major Diameter Basic Pitch Diameter External Thread Internal Thread Minor Dia. Area Tensile Stress Area
Size Minor Diameter
* Standard Sizes of the UNC, UNF, or UNEF series
FREE Publications
CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

more publications