Why do two cartridge protective box quotes differ by more than ten yuan on one drawing?

Answer: Scope. Bare case against complete set, freight in or out, tooling paid once or spread.

Can an order start at 300 units?

Answer: Yes, on an existing mould with a colour change, plus three to five days for cleaning.

Pay for tooling outright or amortise it?

Answer: Under 3,000 units, pay once and own the mould; at ten thousand, amortising keeps cash light.

Is a thirty day lead time realistic?

Answer: Ask whether tooling is included. Thirty days with tooling is not; thirty without it is normal.

How much retention is reasonable?

Answer: Ten percent for six months covers latch and hinge failures; suppliers accept little more.

Cartridge Protective Box Procurement: Quotes, MOQ and Lead Time

Quick answer: Six cost blocks plus tooling make up a cartridge protective box quote: shell, insert, hardware, labour, packing and overhead. Quantity decides whether the mould is bought outright or spread, and lead time is six stages added together.

What a Quote Should Break Down
Order Quantity and Tooling Amortisation
Lead Time from Sample to Shipment
Four Things Buyers Misread
Contract Terms and Payment Milestones
FAQ

1. What a Quote Should Break Down

Comparing two totals is the first mistake. One supplier quotes 168 yuan, another 152 for the same model, and the gap sits in scope: the second prices a bare case and charges 22 yuan for the insert.

Six blocks make up the cost of a cartridge protective box; a missing one means something moved off the sheet.

Block	Share	Basis
Shell material	45 to 55 percent	Net weight times resin price
Insert	15 to 25 percent	Foam plus cutting time
Hardware	5 to 8 percent	Per set
Labour and energy	10 to 15 percent	Cycle time
Packing and freight	4 to 8 percent	Per unit or volume
Overhead and margin	10 to 12 percent	Mark-up on the above

Work material backwards from weight: a 400 by 300 by 150 mm cartridge protective box with a 3.2 mm wall weighs about 1.35 kg, and at 2.4 mm it falls to 1.0 kg, cutting material cost by a third.

2. Order Quantity and Tooling Amortisation

Minimum order quantity for a cartridge protective box is arithmetic, not attitude. A two-cavity mould with slides commonly costs 48,000 yuan, and that figure either lands on the invoice once or hides in the unit price.

Across 1,000 units it adds 48 yuan each, at 3,000 it adds 16, at 10,000 it adds 4.8. Ask who owns the mould: paid outright it travels with the buyer; amortised it stays with the maker.

Quantity	Tooling	Added per unit	Use
300	Existing mould, colour change	None	Trial or sample
1,000	New mould, paid once	48 yuan	Small validation
3,000	New mould, amortised	16 yuan	Standard first order
10,000	New mould, amortised	4.8 yuan	Annual contract

Colour change cuts quantity: an existing mould restarts at 300 units, at the price of three to five extra days and a pulled screw for light shades.

3. Lead Time from Sample to Shipment

A supplier quoting thirty days has usually priced only its own floor. The chain behind a cartridge protective box runs six stages, and any one of them stalls the rest.

Sampling 7 days, tooling 22, trial 5, moulding 12, insert cutting 4, inspection 3, about 53 days. Tooling is the longest and most fragile stage.

Stage	Days	Precondition
Sample approval	7	Drawing, colour chip, insert dummy
Tooling	22	Payment received, steel on site
Trial and correction	5	First-off dimensions agreed
Moulding	12	Three 250 tonne presses, resin dried
Insert cutting	4	Dummy rounds on hand
Assembly and inspection	3	Sampling passed

The 12 moulding days assume three 250 tonne presses at 260 units a day; past 3,000 units a cartridge protective box run needs another press, so capacity belongs in writing.

4. Four Things Buyers Misread

First, bare case against complete set: the missing insert, carton and pallet return at delivery. Second, how many tool corrections are included, since one against two differs by a full tuning phase.

Third, validity and resin linkage: 30 days is common, and a 3 percent clause that moves one way only is no hedge. Fourth, freight and export packing, where a 40 foot high cube holds about 620 units and crates can cost more than the cargo.

None of the four sits in the unit price, yet all four land in the total.

5. Contract Terms and Payment Milestones

Pay for a cartridge protective box by milestone: 30 percent with the order, 60 after inspection, 10 held six months as retention. Early failures on a cartridge protective box cluster at latches and hinges.

Write a daily rate and a cap: 0.3 percent of contract value per day, capped at 5 percent, cancellation after 15 days. Start the clock at inspection, not order date. Force majeure needs written notice inside 15 days.

Conclusion

Procurement is a sum over quantity and scope, not a hunt for the lowest unit price: break the quote into blocks, amortise tooling, commit each lead time stage, write penalties and retention into the contract. Then a cartridge protective box order becomes arithmetic instead of argument.

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.