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Measuring Wedge Selection — Quick Reference
Measuring wedges (taper wedges / wedge gauges) — GRADUATED WEDGE shape for measuring CRACK + GAP + SLOT widths at depth. Workshop + structural inspection + machinery + concrete + automotive. Different from feeler gauge (parallel) — wedge gives WIDTH AT DEPTH.
| Measuring Wedge Type | Best For |
|---|---|
| Standard Wedge Gauge | Workshop gap measurement |
| Bridge / Crack Gauge | Crack width measurement |
| Metric / Imperial Graduated | Match standard |
| Stainless Steel | Workshop standard |
| Small (0-15mm) | Fine gap measurement |
| Larger (0-50mm+) | Wide gap measurement |
| Combined with Feeler Gauge | Workshop versatility |
Critical: Compare to TAPER GAUGE — see taper gauges. Use FEELER GAUGE for parallel gap. Verify CALIBRATION periodically. Companion: taper gauges, measuring tools, feeler gauge guide, telescopic gauges.
Measuring wedges are tapered, graduated gauges that slide into a gap or crack until they stop — the reading at the surface gives the gap width directly. They're a workshop-floor inspection standard for measuring slot widths, weld root gaps, structural cracks and any opening too wide for a feeler gauge.
Where they fit
- Welding inspection — root gap measurement before tacking and welding.
- Structural inspection — crack width tracking on concrete, steel and masonry.
- Machinery condition monitoring — gap and clearance measurement on bearings, gears and couplings.
- Site work where a digital tool is impractical and a fast, reliable mechanical reading is needed.
Read at the surface of the work, hold the wedge perpendicular to the gap, and use the wedge under its own weight — never force it.
People Also Ask — Measuring Wedges
Q: What's the difference between a measuring wedge and a feeler gauge?
A feeler gauge is a parallel-sided blade used to check a fixed, known gap width. A measuring wedge is tapered and graduated — it slides into a gap or crack until it stops, and the reading at the surface gives the gap width directly. Wedges are better suited to measuring irregular or unknown gaps, cracks and slots at depth, where a feeler gauge would need repeated trial-and-error with different blade thicknesses.
Q: What size range do measuring wedges cover?
Small measuring wedges typically cover 0-15mm for fine gap measurement, while larger wedges extend to 0-50mm or more for wider gaps. Selecting the right size range for the job avoids reading errors that come from using a wedge whose graduated scale doesn't comfortably cover the gap being measured.
Q: How do I read a measuring wedge correctly?
Insert the wedge into the gap under its own weight — never force it — and read the graduation at the point where the wedge stops at the surface of the work. Hold the wedge perpendicular to the gap for an accurate reading; measuring at an angle will overstate the true gap width.
Q: What's a measuring wedge used for in welding inspection?
In welding inspection, a measuring wedge checks the root gap between two workpieces before tacking and welding, confirming it falls within the weld procedure's specified range. Getting the root gap right before welding starts affects penetration, fit-up quality and whether the joint will pass inspection.
Q: Can measuring wedges be used to track structural crack widths?
Yes — bridge and crack gauges (a type of measuring wedge) are a standard tool for tracking crack width on concrete, steel and masonry structures over time. Taking repeat readings at the same location lets inspectors monitor whether a crack is stable or progressively widening.
Q: Should I compare a measuring wedge to a taper gauge before choosing one?
Yes — taper gauges and measuring wedges look similar and serve related purposes, but they're calibrated and used differently depending on the application. If you're unsure which is correct for your specific measurement task, check both product ranges or contact AIMS for guidance before ordering.