Quality Standards
Why do you and your clients need quality insurance services?
Quality control is a key success factor for companies dealing with all suppliers who provide production and services.
Our highly qualified management team and technicians provide the best possible advice when a problem is encountered and we can provide guidance on the most cost-effective quality assurance procedures. Our team understands both the technical standards operating in international markets and the requirements of the marketplace.
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BST on-site quality inspections and factory audit services throughout China help businesses to reduce risks associated with poor quality, loading, storage, transportation and non-compliance with regulatory requirements, ensure that contractual obligations are met: specifications, packaging, marking and delivery.
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BST quality inspection hires the inspectors who are responsible, careful, honest and professional to lower your risk of receiving defective goods.
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Consistent customer-centeredness and flexible operations will win more time and space for you.
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Reduce your business trip expenses and other miscellaneous expenses resulting from goods inspections carried out by yourself.
What is critical defects, major defects and minor defects?
Defects found in inspection are classified into three categories: critical defects, major defects and minor defects:
1) Critical defects
Critical defects could result in hazardous or unsafe conditions for individuals using or maintaining the product, as well as defects contravening legal regulations.
2) Major defects
Major defects may affect the duration of product or reduce the ability to use the item (poor functioning, item incomplete or broken, etc.) or give it a flawed appearance which may affect the product value.
3) Minor defects
Minor defects may not reduce the usability of the product but the product quality may be degraded.
What can I find out from the AQL tables?
Understanding the AQL Tables
Sample Size Code Letters
| Lot batch size | S-1 | S-2 | S-3 | S-4 | I | II | III |
|---|---|---|---|---|---|---|---|
| 2 to 8 | A | A | A | A | A | A | B |
| 9 to 15 | A | A | A | A | A | B | C |
| 16 to 25 | A | A | B | B | B | C | D |
| 26 to 50 | A | B | B | C | C | D | E |
| 51 to 90 | B | B | C | C | C | E | F |
| 91 to 150 | B | B | C | D | D | F | G |
| 151 to 280 | B | C | D | E | E | G | H |
| 281 to 500 | B | C | D | E | F | H | J |
| 501 to 1200 | C | C | E | F | G | J | K |
| 1201 to 3200 | C | D | E | G | H | K | L |
| 3201 to 10000 | C | D | F | G | J | L | M |
| 10001 to 35000 | C | D | F | H | K | M | N |
| 35001 to 150000 | D | E | G | J | L | N | P |
| 150001 to 500000 | D | E | G | J | M | P | Q |
| 500001 and over | D | E | H | K | N | Q | R |
Single Sampling Plans for Normal Inspection
| Code | Size | AQL 0.40 | AQL 0.65 | AQL 1.0 | AQL 1.5 | AQL 2.5 | AQL 4.0 | AQL 6.5 |
|---|---|---|---|---|---|---|---|---|
| Ac Re | Ac Re | Ac Re | Ac Re | Ac Re | Ac Re | Ac Re | ||
| A | 2 | 0 1 | ||||||
| B | 3 | 0 1 | ||||||
| C | 5 | 0 1 | 0 1 | |||||
| D | 8 | 1 2 | 1 2 | 2 3 | ||||
| E | 13 | 1 2 | 2 3 | 3 4 | ||||
| F | 20 | 0 1 | 1 2 | 2 3 | 3 4 | 5 6 | ||
| G | 32 | 0 1 | 1 2 | 2 3 | 3 4 | 5 6 | 7 8 | |
| H | 50 | 1 2 | 2 3 | 3 4 | 5 6 | 7 8 | 10 11 | 14 15 |
| J | 80 | 1 2 | 2 3 | 3 4 | 5 6 | 7 8 | 10 11 | 14 15 |
| K | 125 | 1 2 | 2 3 | 3 4 | 5 6 | 7 8 | 10 11 | 14 15 |
| L | 200 | 2 3 | 3 4 | 5 6 | 7 8 | 10 11 | 14 15 | 21 22 |
| M | 315 | 3 4 | 5 6 | 7 8 | 10 11 | 14 15 | 21 22 | 21 22 |
| N | 500 | 5 6 | 7 8 | 10 11 | 14 15 | 21 22 | ||
| P | 800 | 7 8 | 10 11 | 14 15 | 21 22 | |||
| Q | 1250 | 10 11 | 14 15 | 21 22 | ||||
| R | 2000 | 14 15 | 21 22 |
Practically, BST Quality Standards use the MIL-STD-105E tables that are summarized above.