From the Ministry of Science, Industry and Technology:  
COMMUNIQUÉ  ON 
TS ISO 7720 PREVAILING TORQUE TYPE ALL -METAL HEXAGON NUTS, 
STYLE 2 – PROPERTY CLASS 9   
(COMMUNIQU É NO: MSG - MS - 2017/ )  
 
Purpose  
 
ARTICLE 1 – (1) The purpose of this Communiqué  is to identify issues related to the 
implementation of TS ISO 7720 (April 2015) ‘‘Prevailing Torque Type All -Metal Hexagon 
Nuts, Style 2 – Property Class 9’’ standard.  
 
Scope  of this standard  
 
ARTICLE 2 – (1) This standard; specifies the characteristics of prevailing torque type all -
metal hexagon nuts, of style 2, with threads from M5 up to and including M36, in product 
grade A for threads up to and including M16, and product grade B for threads over M16, and 
with property class 9.  
Note 1 – Dimensions of nut s, except mw and hbiggest  dimensions, corresponds to dimensions 
are given in ISO 4033  
Note 2 – Nuts whose property class 5, property class 8, property c lass 10 and property class 
12 are  related with ISO 7042.  
When other features are needed, these features  can be chosen from current standards, for 
example ISO 261, ISO 724, ISO 898 -2, ISO 965 -2, ISO 2320 and ISO 4759 -1. 
 
Legal Basis  
 
ARTICLE 3 – (1) This Communiqué; has been drawn up based on the Decree Law No. 635 
on Organisation  and Duties of the Ministry of Science, Industry and Technology dated 
3/6/2011 ; Law No. 1705 on the Prevention of Adulteration in Trade and Supervision and 
Protection of Exports dated 10/6/1930 ; Law No. 132 establishing Turkish Standards 
Institution dated 18/11/1960 and Regulation on Mutual Re cognition in Non -regulated Areas 
that was put into force with the Decision No. 2012/3169 of the Council of Ministers dated 
2/5/2012  
 
Putting into Effect  
ARTICLE 4 – 1026 -83 ‘‘Fasteners -Nuts -Hexagon -Part:83 -Metric Safe All Metal, Style 2 -
Property Class 9 -Product Quality a and b ’’ standard  is canceled. Instead TS ISO 7720  (April 
2015) ‘‘ Prevailing Torque Type All -Metal Hexagon Nuts -Style 2 -Property Class 9 ’’ was 
adopted and decided to be published in the meeting of Techni cal Board of Turkish Standards 
Institution (TSE) dated 2/ 4/2015 has been put into effect as mandatory in manufacturing and 
sales stages.  
 
 
 
 Compliance Obligation  
 
ARTICLE 5 – (1) Those who produce and sell products on the market within the scope of TS 
ISO 7720  (April 2015) Standard shall be obliged to comply with the provisions of this 
Communiqué.  
 
Mutual Recognition Clause  
ARTICLE 6 – (1)  The provisions of this Communiqué on TS ISO 7720 (April 2015) 
‘‘Prevailing Torque Type All -Metal Hexagon Nuts -Style 2 -Property Class 9 ’’ shall not apply 
to the products which were legally produced or put into free circulation in a Member State of 
the European Union.  
         (2) Nonetheless, the Ministry of Science, Industry and Technology may submit 
the product referred  to in paragraph (1) to an evaluation following the rules and procedures 
laid down in Chapter Three of Regulation on Mutual Recognition in Non -Harmonised Area as 
a result of this evaluation if it finds out that this product does not provide a level of prot ection 
equivalent to that sought by this Communiqué on TS ISO 7720  (April 2015) ‘‘Prevailing 
Torque Type All -Metal Hexagon Nuts -Style 2 -Property Class 9’’  it may prohibit placing on 
the market of the product, make its placing on the market subject to prior  conditions or have 
the product withdrawn or recalled from the market.  
 
Provision  
ARTICLE 7 – (1) TS ISO 7720  (April 2015) standard shall be obtained from the central 
organization or provincial representative offices of TSE. Contact information can be accessed 
from the website of the TSE.  
 
Repeal  
ARTICLE 8 – (1) TS ISO 7720 Standard in (Communiqué No: Mandatory Standard -94/32 -
33) that was published in the Official Gazette No:  22837  and dated 04/12/1996 has been 
repealed.  
Entry into Force  
ARTICLE 9 – (1) This Communiqué shall enter into force six months after its publication.  
 
Enforcement  
ARTICLE 10 – (1) The provisions of this Communiqué shall be enforced by the Minister of 
Science, Industry and Technology.