European standardization EN 10204
It defines various types of product certificates (inspection documents) that are provided to the customer (end user) in accordance with the terms of delivery or contract requirements, when supplying all metal products, including fasteners, such as bolts, studs, nuts, washers, using any method of their manufacture. In the 2004 edition, this standard may also apply to non-metallic products.
Product certificates according to EN 10204:2004
EN 10204:2004 and EN 10204:1991 standards:
Certificate 2.1 according to EN 10204;
Certificate 2.2 according to EN 10204;
Certificate 3.1 according to EN 10204;
Certificate 3.2 EN 10204.
Product certificates according to EN 10204:2004
This European standard, its current version EN 10204:2004, is used in conjunction with the technical requirements for the product, which define the technical conditions for its delivery.
The EN 10204:2004 standard includes four types of certificates that can be delivered with a batch of goods by Eurobolt Ukraine:
Two types – 2.1 and 2.2 – are certificates issued on the basis of the results of workshop or factory tests and inspections
(in accordance with the terms of delivery, provided with the batch of goods);
Two types – 3.1 and 3.2 – are certificates issued on the basis of the results of product testing to the technical requirements set forth in the technical specifications for the supply of products (provided on a paid basis after the necessary tests have been carried out).
Certificate 2.1 according to EN 10204
This is the lowest level certificate EN 10204. In this document, the direct manufacturer – the factory – simply declares that it has made, for example, bolts according to DIN 933,
in accordance with customer or contractual requirements. This certificate does not contain any data in the form of test results.
Such a certificate is usually signed by a responsible person at the level of the head of the shop where the products were manufactured.
Certificate 2.2 EN 10204
Certificate 2.2 is issued by the manufacturing plant. In this case, the manufacturer declares with its certificate that, for example, the steel meets the technical requirements of the customer or the contract, and also provides test results to confirm that this is the case.
In this case, the quality control unit that issues this certificate is part of the manufacturing shop.
Therefore, in this case, there may be some distrust of the test results.
Certificate 3.1 according to EN 10204
Certificate 3.1 requires the manufacturer to fulfill a number of important requirements. First, the manufacturer must test the batch of products, such as DIN 933 bolts, that are directly sold. Therefore, the test results from the certificate relate to the delivered products and characterize the properties of the delivered batch – within the limits allowed by the sampling methodology used.
Secondly, this certificate requires that the tests be conducted by a testing laboratory that is formally independent of the production, for example, a rolling mill. This means that the production unit – the shop – does not test and has no power to change or influence the test results. In combination with a quality system such as EN9001:2010, a 3.1 certificate according to EN 10204 is significantly more authoritative than certificates 2.1 and 2.2.
Certificate 3.2 according to EN 10204
Certificate 3.2 is the most stringent of all types of certificates according to EN 10204. As with Certificate 3.1, this certificate is based on tests conducted by an independent factory laboratory on samples from the exact batch of products being delivered. However, in addition, this certificate must be confirmed – certified – by a representative of the customer or the relevant government agency.
In practice, the 3.2 certificate is prepared jointly by the quality control department of the manufacturing plant and inspectors of an independent third party, usually a reputable certification organization, such as NDC Nadezhnist.
Two types of Eurobolt Ukraine products are certified in Ukraine:
Certificates of conformity to a standard or technical specifications (TU) – issued for imported products and products of Ukrainian origin for a maximum period of 3 years.
Quality certificate – issued for a specific batch of products.
For metric products (bolts, screws, nuts, studs), a conformity check is performed:
GOST 1759-0 – general;
GOST 1759.4 – bolts, screws, studs (DSTU (ISO) 898-1, 898-2);
GOST 1759.5 – nuts.
The quality certificate indicates:
1) Name (bolts – nuts) hereinafter B and D;
2) Material (strength class 8.8; 10.9; 12.9 – mandatory) B and D;
3) Strength limit B;
4) Yield strength for bolts of strength class 4.8, 5.8, 6.8;
5) Conditional yield strength for bolts of strength class 8.8, 10.9, 12.9;
6) Hardness (strength class 8.8; 10.9; 12.9 – mandatory) B and D;
7) Relative elongation – B;
8) Relationships