Which item comes first in socket wrench set case acceptance?

Answer: Appearance, then dimensions. A sink mark makes later readings meaningless, and liner fit only follows once dimensions pass.

Why use a feeler gauge for liner fit?

Answer: A hand finds a lifted edge but not a narrow gap. A feeler entering past 3 mm means the liner is not seated, and a loose insert wears the pocket wall first.

How many latches are tested?

Answer: Both. One low latch loads the lid unevenly, and the weaker side fails first.

Why are drop and stack type tests?

Answer: They measure structural margin, not the workmanship of one batch. One run per structure is enough, repeated after any material change.

What happens when sampling fails?

Answer: Grade decides. One critical defect rejects the lot; majors above the number double the sample; minors may pass with a note.

Socket Wrench Set Case Acceptance: Test Items and Judgements

Quick answer: Acceptance of a socket wrench set case runs on seven items: appearance, dimensions, liner fit, latch force, drop, stack and salt spray. Each gets a method and a pass value, then AQL sampling and a defect grade decide release.

What the socket wrench set case acceptance covers
Appearance and dimensional measurement
Liner fit and latch holding force
Drop and stack tests
Salt spray and AQL sampling
FAQ

1. What the socket wrench set case acceptance covers

Acceptance fixes seven items into one sheet for a socket wrench set case, each with a method and a pass value. Appearance and dimensions run on every unit; liner fit and latch force are sampled per batch; drop, stack and salt spray are type tests, run once per structure.

Order matters: appearance precedes dimensions, and type tests sit last, since they measure margin rather than craft.

Item	Method	Pass
Appearance	Visual, 500 lux	No cracks or through scratches
Dimensions	Caliper, plate, gauge	Outline within 2.0 mm
Liner fit	0.25 mm feeler	No entry past 3 mm
Latch force	Pull gauge, 10 seconds	200 N or more
Drop	15 kg loaded, 1.2 m	No crack, latches shut
Stack	200 kg on top, 72 hours	Set under 2 mm
Salt spray	Neutral, 48 hours	No red rust, white rust under 5 percent

2. Appearance and dimensional measurement

Read appearance at 500 lux from 600 mm, square on and from the side: cracks, through scratches, flow and sink marks. Colour goes to a spectrophotometer on three cases, within delta E 1.5.

Four dimensions decide. Outline sits within 2.0 mm; wall comes from nine readings averaged to 3.8 mm plus or minus 0.15 mm; floor diagonal differs under 2.5 mm; rim warp stays below 2 mm per metre. Condition samples 4 hours at 23 C and 50 percent humidity first.

3. Liner fit and latch holding force

With the liner seated, run a 0.25 mm feeler along each rim; entry past 3 mm fails the unit. Three pockets then get a centre offset check, within 0.4 mm.

Socket wrench set case: four closed black cases stacked on a steel shelf above a workbench with an open case and sockets laid out

Latch force is a pull gauge job: load to rating, pull at the tongue, hold 10 seconds, no release at 200 N. After 2000 cycles force stays above 170 N, a loss under 15 percent, and both latches sit within 20 N.

4. Drop and stack tests

Drop a case loaded to 15 kg from 1.2 m onto concrete, once on each face, then repeat from a corner after six hours at minus 18 C. No crack, no sprung latch, no lifted liner, and it must still close and latch.

Stack puts 200 kg on the lid for 72 hours at 45 C. Set stays under 2 mm an hour after release, the lid takes no dish and the latches do not shift. Take the warehouse tier count plus one, up to five.

5. Salt spray and AQL sampling

Salt spray covers metal only: latches, pins and rivets. After 48 hours of neutral spray there is no red rust and white rust stays under 5 percent. Inserts come off finished cases, not supplier coupons.

Sampling of a socket wrench set case follows GB/T 2828.1, normal, single, general level II. A lot of 501 to 1200 gives 80 pieces: AQL 1.0 major, accept 2 reject 3; AQL 2.5 minor, accept 5 reject 6. Critical items are not sampled; every unit is checked.

Lot size	Sample	Major accept and reject	Minor accept and reject
151 to 280	32	1 and 2	2 and 3
281 to 500	50	1 and 2	3 and 4
501 to 1200	80	2 and 3	5 and 6
1201 to 3200	125	3 and 4	7 and 8

Grade	Examples	Action
Critical	Latch off, shell cracked	Reject the lot
Major	Outline out, low latch force	Double the sample
Minor	Faint flow mark, label off centre	Accept with a note

Records trace batch code, mould, machine and resin lot; the code has twelve digits. Two retention samples per batch sit eighteen months. Miss one layer and the batch is untraceable.

Conclusion

Acceptance for a socket wrench set case is one table tying method, gauge, pass value and record. Full inspection guards appearance, sampling guards latches, type tests guard margin. Draw the boundaries clearly and a socket wrench set case batch stops drifting.

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.