The Web's best Machine Design Guide for Mechanical Engineers and Designers            


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Try these great interactive web apps and data tools (that we have written just for you) for your next design project.

iCrank THREAD Apps and Data...
ACME Thread Calculator
Type in the nominal size and threads per inch for your ACME thread and get all the needed min and max diameters for your machine drawing.
BUTTRESS Thread Calculator
Type in the nominal size and threads per inch for your American National Standard BUTTRESS thread and get all the needed min and max diameters for your machine drawing.
Screw Data Page
Check out this app that gives all of the relevant data for sockethead capscrews, panhead machine screws, hexhead capscrews and flathead machine screws...  Simulates the TAD type "screw selector" slide-card.
METRIC Screw Data
Same as above, only in metric
Set Screw Data Page
Check out this app that gives all of the relevant data for hex head and spline head set screws. Includes data for flat, cup, cone, oval and half-dog point set screws.  Simulates the TAD type "screw selector" slide-card.
Bolt Torque Chart
This app will generate a "Recommended Bolt Torque" chart based on your custom inputs.
Standard Tap Size Chart
Gives the recommended drill size for American standard and ISO metric threads
Drill Size Chart
Gives the decimal value for standard drill sizes
NPT Tap Size Chart
Recommended drill sizes for National Pipe Threads
Wrench Clearances
Suggested hex-head bolt/screw spacing and clearances needed for wrenches including open-end, box and socket.


iCrank SPRING Calculators...
Compression Spring Design Calculator
Designing a compression spring?  Here's a tool that allows you to iteratively calculate a spring's characteristics by entering a few simple inputs.
Torsional Spring Design Calculator
Designing a torsion spring?  Here's a tool that allows you to iteratively calculate a spring's characteristics by entering a few simple inputs.
Wave Spring Design Calculator
Designing a wave spring?  Here's a tool that allows you to iteratively calculate a spring's characteristics by entering a few simple inputs.


iCrank SEAL Apps and Data...
O-ring Groove Design Calculator (MALE gland)
Designing a radial o-ring groove? Here's a tool that allows you to interactively calculate a seal's stretch, squeeze and volume fill by entering the input geometry.
O-ring Groove Design Calculator (FEMALE gland)
Same great app as above, but used for female glands.
O-ring Data Page
Check out this app that gives all of the relevant data for standard o-ring sizes: OD/ID/cross-section/volume/metric for AS-568A uniform dash numbers
Shore Hardness Values Chart
Relative chart showing how Shore A, Shore D and Shore 00 scales are related.


MORE iCrank apps and data...
Spur Gear Calculator
Calculate your spur gear data for American National Standard Coarse  Pitch Tooth Forms for pressure angles of 20 and 25 degrees (ref. ANSI B1.6)
Conversion Factors for Selected Units
A table containing your most often used units conversion factors.  You'll also find a printable wall-chart here!
Hardness Conversion (steel) 
Enter a hardness value and getthe equivalent hardness in other common units as well as estimated tensile strength.  Or if you know tensile strength you can get the approximate hardness equivalent.
RPN Calculator - Web App!
Can't function without RPN?  If your brain is wired for RPN and you don't have one handy - fire up our online version and crank those numbers out.
Standard Force and Shrink Fit Calculator
Input a nominal hole diameter and receive all of the dimensional allowances for the hole and shaft for class FN1 thru FN5 interference fits.
Sheet and Wire Gage Chart
Gives you the decimal value for standard sheet and wire gages. Now gives values for SWG, AWG, BWG and Manufacturer's standard.
Surface Roughness
A chart showing the range of surface roughnesses typical for a number fabrication processes.






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