Engineering Articles
Clear answers to real engineering questions.
In-depth articles on tolerance stackup, bolting, lifting, piping, and more — written to explain the reasoning behind the calculation, not just give you a formula to copy.
article / May 31, 2026
Tapped Hole to Clearance Hole Stackup — Rectangular Pattern
A practical guide to tapped rectangular tolerance stackups: what makes a threaded joint different from a clearance one, the five inputs that drive the result, and how the projection (lever-arm) effect and bolt camber feed into worst-case and RSS calculations—followed by a complete worked example.
article / May 27, 2026
How Clearance Hole to Clearance hole Stackup Works — Rectangular pattern
Learn how hole size, position tolerance, bolt camber, and coating thickness combine in a rectangular bolt pattern — explained with real numbers so you can understand exactly what the calculator is doing and why
article / May 27, 2026
Bolt Head Pull-Through Check: What It Is and How to Calculate It
A bolt head pull-through failure happens when a clearance hole is large enough — after tolerances, build variation, and coating — for the bolt head or washer to slip straight through under load. This guide explains the failure mode in plain terms, walks through the three dimensions that drive the check, and shows you how to run the calculation using the enggtools.in Bolt Head Check module
article / May 26, 2026
How Clearance Hole to Clearance Hole Stackup Works — Circular Pattern
When bolts must pass through holes arranged on a bolt circle, small errors in BCD, angle, and hole size all stack up. This guide walks you through the circular clearance hole stackup from scratch — explaining how BCD and angle tolerances convert into a positional shift, how worst-case and RSS results differ, and what to fix when the stackup fails.
article / May 23, 2026
What Is Tolerance Stackup — and Why It Matters
When every part is within spec yet nothing fits together, tolerance stackup is usually to blame. Understanding it is the difference between a product that works and one that doesn't.