Bolt Lab

Short animated explainers on how fasteners actually behave — the thread, the coating, the preload, the concrete — made by the people who make them. Each one shows the mechanism, names the standard, and tells you what to check. None of it is a design value; all of it is what we wish every customer knew before they ordered. Companion to Build Your Bolt.

In the lab now

Galvanizing & thread fit

Why hot-dip galvanized nuts are tapped oversize, what a standard nut does on a coated bolt, and why an oversize nut must never go on a bare one.

Animated · 4 steps · ISO 10684 · ISO 1461 02

Torque is not preload

Where the torque on your wrench actually goes, and why the same number gives a different clamp load on every finish.

Animated · 4 steps · T = K × F × d 03

Head markings chart

Click a head and read the grade, the standard, the mechanical properties and the nut that belongs with it.

Interactive · 15 grades · ISO · SAE · ASTM 04

How anchor bolts fail

Steel failure, concrete cone breakout and pull-out, side by side — and what the plate washer is really doing down there.

Animated · 4 steps · ACI 318 Ch.17 · EN 1992-4 05

Coating life in the Gulf

Zinc is consumed, not permanent. Pick your environment and coating and see the years to first maintenance.

Animated · interactive · ISO 12944-2 · ISO 1461

Next in the series: how a bolt is made · flange tightening sequence · vibration loosening.

How the lab works

Mechanism firstEvery explainer starts with a cross-section or a moving part, so you see the cause before you read the rule.

Standard namedEach page names the standard it rests on, with the clause or table where it matters, so you can check us.

What to ask forEvery page ends with the questions to put to your supplier — including us.

Not a design valueFigures shown are the standard's own limits or illustrative ranges. Joint design stays with the engineer of record.