Bolt Preload and Torque: How to Calculate Clamp Force
Turn torque into clamp force with T = K.D.F. Nut factor, 75% proof-load target, and a 1/2-13 Grade 5 worked example showing why lubrication changes everything.
Mechanical Design Tools
Mechanical Engineering Design Tools
Here you can find an assortment of mechanical design tools intended to help reduce the monotony of mechanical engineering. The hope is that these guides and help you located frequently need information and will help streamline your design process.
There are tables, formulas, shortcuts and advice. All these should be taken as aids, but never accepted without your own validation of the mechanical design tools within the context of your own application and your own analysis.
If there are any areas where you need further assistance, please feel free to contact us to recommend a new design tool.
O-Ring Groove Design: Sizing a Gland for Static Seals
Design an O-ring gland right: squeeze, gland fill, and clearance targets plus a full AS568 -214 static seal worked example for groove depth and width.
Hydraulic Hose Pressure Drop: A Practical Worked Example
Size hydraulic hose by fluid velocity and compute pressure drop with Darcy-Weisbach. Recommended velocities, Reynolds number, and a full 15 gpm worked example.
How to Calculate Bearing L10 Life (ISO 281 Worked Example)
Calculate rolling bearing L10 rating life per ISO 281. Formula, ball vs roller exponents, a full 6208 worked example, and the adjusted Lnm life explained.
Color Contrast for Engineering Documentation: WCAG, Safety Colors, and Spec Sheets
Contrast ratios, colorblind-safe design, ANSI/ISO safety colors, and keeping a specified color consistent from screen to RAL/Pantone print in engineering deliverables.
Resolving Force Vectors: Components, Resultants, and a Worked Statics Example
How to resolve a force into x and y components, sum them, and recombine into a resultant with the correct quadrant angle. Two-cable worked example and the sign traps to avoid.
Hydraulic Hose Sizing and Pressure Drop: A Practical Selection Guide
Size a hydraulic hose from flow and pressure using the three velocity limits and a Darcy pressure-drop check, plus how to read SAE dash sizes. Worked example included.
Bearing Fits Explained: Choosing Shaft and Housing Tolerances (ISO 286)
How rolling-bearing fits work and how to pick shaft and housing tolerances (h6, k5, H7) from load and rotation, with an ISO 286 worked example on a 6205 bearing.
Choosing the Right Seal Elastomer: A Compatibility Guide for O-Rings and Hydraulic Seals
NBR, FKM, EPDM, HNBR, silicone, or PTFE? A practical guide to matching seal elastomer to fluid and temperature — with a quick-reference compatibility table and the classic mistakes that cause seal failure.
Bolt Torque vs. Preload: Getting the Clamp Load You Actually Designed For
Torque is not clamp load — it is a proxy for it. This worked example shows how to calculate bolt preload and the correct torque using the T = K·F·d relation, for both a 1/2-13 Grade 5 and an M12 8.8 fastener.