Can OEM plastic cases for electronics be ordered below 300 pieces?

Answer: It can be discussed, but pricing follows the 300-piece level and the gap returns as spares or a credit.

Should tooling be paid separately or amortised?

Answer: Above 3,000 pieces, amortising into the unit price is easier on cash flow. If volume is uncertain, pay separately and record ownership.

Is a mould always needed for sampling?

Answer: No. A 3D print covers appearance in seven days; a CNC sample or a T1 part is needed to prove a 1.2 m drop.

What sampling standard applies at inspection?

Answer: AQL 1.0 major, 2.5 minor, colour within Delta E 1.5 and dimensions within 0.3 mm, attached to the contract.

OEM Plastic Cases for Electronics: Quotes, MOQ and Lead Time

Q: How is the 25-day lead time built up?

Answer: Five days of material, twelve of moulding, four of foam, four of assembly. Foam is compressed most often.

Quick answer: A quotation for OEM plastic cases for electronics splits into moulding, tooling amortisation, foam, hardware, packaging and testing. Minimum order is usually 300 pieces and production runs about 25 days, so the six lines have to be compared one by one.

How OEM Plastic Cases for Electronics Are Quoted
Minimum Order Quantity and Real Capacity
Tooling and Sampling Timeline
Lead Time and Inspection Milestones
Five Clauses for the Purchase Contract
FAQ

1. How OEM Plastic Cases for Electronics Are Quoted

OEM plastic cases for electronics look like one unit price, but six lines sit behind it. Quotes of CNY 96 and CNY 128 for the same drawing usually differ in tooling amortisation: over 3,000 pieces the mould adds CNY 12.7 each, over 300 it adds CNY 127.

Moulding depends on resin grade, part weight and press tonnage. Copolymer and homopolymer PP differ twofold in cold impact, 40 g of extra weight costs CNY 0.35, and a 600 × 450 × 250 mm case runs a 55-second cycle on 1,000 tonnes. Routed EVA at 30 kg/m³ costs CNY 18 per set; a nylon latch, CNY 6 to 9 per pair.

Cost line	Share	Driver
Moulding	38%	Resin, wall
Tooling	12%	Amortisation base
Foam insert	18%	Routed or laminated
Hardware	11%	Latches
Packaging	9%	Printing
Testing	12%	Test scope

2. Minimum Order Quantity and Real Capacity

MOQ for OEM plastic cases for electronics comes from cavity count, press tonnage and changeover, not from a catalogue. A single cavity makes 1,440 pieces a day, so 300 pieces is four hours of running: four hours of changeover plus 30 pieces of settling scrap set the break-even point.

OEM plastic cases for electronics in white and blue, open, dark foam in the lid, two handheld devices, three silver cells, blue handle

Check three documents, not a monthly output claim: the press tonnage list, cavity count per tool, and current schedule. If they disagree, the delivery promise has no basis.

Case size	Press	MOQ	Tooling
400 × 300 × 150 mm	650 t	300	CNY 26,000
500 × 400 × 200 mm	800 t	300	CNY 32,000
600 × 450 × 250 mm	1,000 t	500	CNY 38,000
800 × 600 × 350 mm	1,600 t	500	CNY 65,000

3. Tooling and Sampling Timeline

Allow 30 days for tooling: five of design, seven for the mould base, fifteen for machining, three for T1. Rework runs five to seven days a round, usually two rounds, first sink marks and flash, then fit.

Sampling has three routes: a 3D print in seven days for appearance only, a CNC sample in ten that survives a 1.2 m drop, a T1 moulded part in 30 that is the real article. Freeze the drawing with 1.5 degrees of draft and rib roots at 0.6 times the wall.

4. Lead Time and Inspection Milestones

The 25-day run splits into five days of material, twelve of moulding, four of foam, four of assembly. Foam is compressed first because routing can be outsourced, moving pocket tolerance from 0.5 mm to 1 mm.

OEM plastic cases for electronics, black corner close-up, grained shell, a black seal running along the rim, dark foam holding a glossy black panel

Inspect at T1 for cavity size and latch alignment, at the 100-piece pilot for fit and drop, and at mass production with AQL 1.0 major, 2.5 minor. Colour stays within Delta E 1.5, dimensions within 0.3 mm, and no flow mark exceeds 2 mm.

Stage	Days	Deliverable
Drawing approval	3	2D drawing, colour chip
Prototype	7	3 samples
Tool build	30	T1 parts
Pilot run	10	100 pieces
Production	25	Inspection report

5. Five Clauses for the Purchase Contract

Five clauses matter more than price: tool ownership, amortisation method, late delivery penalty, inspection standard, and tool life. Write down where the tool is stored and who owns it if cooperation ends.

State the quantity at which amortisation stops, attach AQL values and tolerance bands, and rate tool life at 300,000 shots with notice before refurbishment. Sign a first-article sample, dated and kept by both sides.

Conclusion

Buying OEM plastic cases for electronics comes down to three habits: read the quote as six lines, calculate MOQ from changeover cost, and check lead time against four production blocks. With amortisation base, inspection points and tool ownership written down, the same supplier can carry the next batch of OEM plastic cases for electronics.

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.