What is the monthly tolerance for latching of wedges and blocking tray?

• A. 0.5 mm
• B. Functional
• C. 1 mm
• D. 2%

Answer: (B)

Functional tolerances are used when the essential requirement is that the mechanism works correctly, not when a specific measurement is met. For latching wedges and a blocking tray, the critical test is whether the latch engages securely and the tray stays in place during normal use. There isn’t a single fixed distance to measure; instead, you verify that the latch functions reliably under expected conditions. If it consistently latches and holds as intended, the functional criterion is satisfied. Numerical options like 0.5 mm, 1 mm, or a percentage don’t capture the real standard here, because the key is operability, not a preset gap or size.