Which items in a Portable Tool Box acceptance standard need 100 percent inspection?

Answer: Appearance, latch feel and handle seating. No equipment needed and failures are visible; everything else is sampled.

Is 10 minutes enough for a handle static test?

Answer: Enough to show creep. Ten minutes exposes set beyond 1.5 mm; a longer hold rarely changes the verdict.

Where does 3000 latch cycles come from?

Answer: Four openings a day for two years. Where use is heavier, raise it to 5000 in the contract.

What service life does 48 h of salt spray represent?

Answer: Only a relative comparison. It screens out thin plating; field life needs a study per environment.

Can a failed batch be sorted and shipped?

Answer: Yes, once. Sort, resubmit, and record how many were removed and why.

Portable Tool Box Acceptance: Test Items and Judgements

Quick answer: Acceptance for a Portable Tool Box must be written as clauses, not adjectives: every test needs a condition, a sample size and a pass line, from handle load to salt spray.

The Acceptance Frame and Test Item List for a Portable Tool Box
Handle Static Load and Latch Cycle Life
Drop, Stacking and Temperature Test Conditions
Sampling Plan and Batch Judgement
Shipping Documents and Batch Traceability
FAQ

1. The Acceptance Frame and Test Item List for a Portable Tool Box

Acceptance clauses for a Portable Tool Box fail as adjectives. Dust-tight, strong handle, no defects: the inspector judges by feel. Three parts fix it: condition, sample size, pass line.

The frame has two layers. Layer one screens every piece for appearance, latch feel and handle seating in 30 s without equipment; layer two is the laboratory, per batch.

Test item	Condition	Pass line
Appearance	500–600 lx, 500 mm, 30 s	sink ≤ 0.3 mm, flash ≤ 0.2 mm
Key dimensions	CMM at 25 °C for 4 h	CPK ≥ 1.33
Handle, static	720 N for 10 min	set ≤ 1.5 mm
Handle, dynamic	270 N, 1.5 m, 10 drops	no break
Latch life	3000 cycles at 30/min	hold ≥ 300 N
Salt spray	5% NaCl, 35 °C, 48 h	rust ≤ 5%

Every pass line is reproducible by a third party; 720 N instead of strong gives both sides a common language.

2. Handle Static Load and Latch Cycle Life

The handle is pulled thousands of times, so it needs two judgements. Static load is four times the rating, 720 N at 18 kg for 10 min, with set under 1.5 mm.

Portable Tool Box: a closed blue case at an angle, two ribs along the lid, a folding handle between two latch levers, rounded corners

Dynamic testing exposes assembly errors. Load 270 N, lift to 1.5 m, release onto 50 mm concrete, ten times. Failures cluster at the pin bore, pin and mount root; 0.4 mm out of round fails.

Latch life is counted. Three thousand cycles at 30 per minute is two years of use: opening force may not decay more than 20 percent, and holding force stays above 300 N.

3. Drop, Stacking and Temperature Test Conditions

Drop clauses for a Portable Tool Box need posture and height: one corner, three edges, six faces, one sample each, at 1.2 m below 10 kg and 0.9 m above, onto 50 mm concrete with no padding. Judge cracks and rim fit.

Cold drop is separate: hold samples at minus 18 °C for 4 h, drop within 30 s. Notched impact of PP falls to a third, so a box that passes warm often cracks cold.

Stacking must state temperature and time: five times the box weight, 90 kg at 18 kg, at 40 °C for 7 days, failing beyond 3 mm. Cycling runs 16 h at minus 25 °C and 16 h at 60 °C.

4. Sampling Plan and Batch Judgement

Sampling starts with a batch: one model, one cavity set, one shift, capped at 2000 pieces. That matters more than any AQL number.

Portable Tool Box: dozens of blue cases stacked in tiers on a timber pallet in a workshop, handles facing out, grey parts bins on shelving

Inspection follows GB/T 2828.1 at general level II. A batch of 501 to 1200 maps to code J and a sample of 80. Defects split: critical AQL 1.0, major 2.5, minor 4.0.

Batch size	Sample	AQL 2.5 Ac/Re	AQL 4.0 Ac/Re
151–280	32	2 / 3	3 / 4
281–500	50	3 / 4	5 / 6
501–1200	80	5 / 6	7 / 8
1201–2000	125	7 / 8	10 / 11

One critical defect rejects the batch with no Ac applied; major and minor follow the table. A rejected batch may be sorted and resubmitted once.

5. Shipping Documents and Batch Traceability

Documents are not paperwork. A delivery carries four items: inspection report, material certificate, first-article sheet and cavity stamp. The first two say what was done, the last two where it came from.

The stamp sits in one base corner, clear of stack contacts and the seal face. Three millimetres tall and 0.3 mm deep reads clearly; at 0.5 mm it bulges inside. Retain three samples per batch for a year.

Conclusion

Acceptance comes down to numbers a third party can reproduce: 720 N static load, 3000 latch cycles, a 1.2 m drop, 48 h of salt spray. Tie those to a sample size and a decision rule and a Portable Tool Box ships on evidence.

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.