Is one appearance checklist enough for Ammunition Box acceptance?

Answer: No. It covers class C only, so class A seal defects pass through. Add dimensions, wall thickness, air tightness and one destructive sample.

Why is the air test capped at 1.5 kPa?

Answer: At 20 kPa over 60 seconds that is about 10 ml per minute of leakage. Tighter rejects good parts, looser fails at IP67.

Why drop at −18 °C?

Answer: The compound turns brittle and the failure mode changes: a room-temperature drop cracks, a cold drop tears a corner off and splits the latch boss.

Does AQL 1.0 allow one percent defects?

Answer: No. AQL is the acceptance limit of the plan, not a permitted defect rate: accepting one unit in 50 still demands better quality across the lot.

Can reworked lots use the same standard?

Answer: Yes, with additions. The code takes a suffix, the sample doubles and one more air test is added, because twice-moulded compound leaves stress near the latch boss.

Ammunition Box Acceptance Standards: Items and Verdicts

Quick answer: Ammunition Box acceptance rests on defect tiers, sampling plans, test methods and numeric verdicts. Class A is zero-tolerance, class B runs at AQL 1.0 and class C at AQL 2.5; air tightness passes with a 1.5 kPa drop held 60 seconds from 20 kPa, water at IP67 with under 1 g of paper gain.

How Ammunition Box Acceptance Is Tiered
Cosmetic Defects and Dimensional Tolerances
Wall Sampling, Air and Water Testing
Drop, Vibration and Salt Spray Limit
Markings, Lot Traceability and AQL Rules
FAQ

1. How Ammunition Box Acceptance Is Tiered

Tier the Ammunition Box acceptance standard before choosing a sampling plan, or a 10 mm scratch and a cracked latch boss take the same approval route. Class A is outright failure such as a missing seal, a cracked boss or walls under 2.5 mm; class B is fit and service life, such as cavity oversize or corrosion; class C is appearance.

Tiering sets the sampling: A in full, B at AQL 1.0, C at AQL 2.5 on inspection level II, so a 500-unit lot samples 50 with Ac 1 Re 2 for B and Ac 3 Re 4 for C.

Class	Items	Verdict
A	missing seal, cracked boss, thin walls	zero tolerance
B	cavity oversize, uneven gap, corrosion	Ac 1 Re 2
C	scratches, colour drift, flash	Ac 3 Re 4

2. Cosmetic Defects and Dimensional Tolerances

Appearance clauses fail when written as no obvious defects. Write limits: scratches under 15 mm, at most two per face, sink marks under 0.3 mm, flash under 0.2 mm and not sharp, flow marks invisible at 500 mm under 300 lux. Colour is judged apart: five cases side by side within ΔE 1.5.

Dimensions rest on four readings: cavity ±1.2 mm, diagonal difference 1.5 mm, lid gap 0.6 to 1.0 mm, base flatness 0.8 mm. A twisted body shows up in the diagonal long before it leaks.

3. Wall Sampling, Air and Water Testing

Wall thickness is sampled: ten cases per lot, five points each on both side walls, the base centre, lid centre and latch boss root. The minimum stays above 2.7 mm and the mean above 2.85 mm, since the mean hides thinning and the minimum lets one outlier decide.

Ammunition Box: closed white case on a steel table, three latches aligned with a folding handle, vertical lid ribs and a continuous dark gasket line, grey racks and block wall behind

Air tightness fixes its conditions in the clause: plug the vent, charge to 20 kPa, hold 60 seconds, accept a drop of 1.5 kPa. Over that, check gasket first, latch preload second, lid flatness last.

Water follows IP67, one metre for 30 minutes with weighed paper inside and a gain under 1 g. A rain spray is not a water test; immersion failures sit at latch and hinge penetrations.

4. Drop, Vibration and Salt Spray Limit

Drop is the costliest and most useful clause: 1.2 m, ten drops on six faces, three edges and a corner, from four hours at −18 °C. A pass means no crack, no latch release, no seal shift, and opening force still between 60 N and 140 N.

Vibration runs 10 to 500 Hz at 1.5 g for 30 minutes per axis, finding hinge pins and latch springs that no static check reveals. Salt spray judges hardware only: 48 hours neutral with grade 9 or better, and 96 hours on the body with no blistering.

Test	Condition	Pass line
Air	20 kPa held 60 s	drop ≤1.5 kPa
Water	1 m for 30 min	gain ≤1 g
Drop	1.2 m at −18 °C	no crack

5. Markings, Lot Traceability and AQL Rules

Each Ammunition Box carries a moulded lot code, the material grade and the ingress rating. The code is eight digits, four for year and month, four for press and shift, and it survives 50 wipes with ethanol.

The code traces back to press, shot, compound batch and inspector, and rework takes a suffix. At 500 units with 50 samples, class A rejects on a single failure, B is Ac 1 Re 2, C is Ac 3 Re 4. Double the lot and the sample comes from the level II table.

Conclusion

An Ammunition Box acceptance standard turns good or bad into pass or fail: three defect classes, AQL sampling, conditions fixed in the clause and verdicts given as numbers. Tiering tells an inspector what cannot be released, and written conditions end the argument between buyer and maker. Pressure drop, immersion gain and drop cracks are settled on the bench before any Ammunition Box ships.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.