QC/T 1103-2019 English PDF (QCT1103-2019)

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QC/T 1103-2019: 12-point head heat resistant nuts
QC/T 1103-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
T 31
12-point head heat resistant nuts
12角头耐热锁紧螺母
ISSUED ON: AUGUST 02, 2019
IMPLEMENTED ON: JANUARY 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Type size ... 5 
4 Technical requirements and reference standards ... 6 
5 Product number ... 7 
12-point head heat resistant nuts
1 Scope
1.1 This standard specifies the type, size, technical requirements, reference standard
and number of 12-point head heat resistant nuts for automobiles.
1.2 This standard is applicable to 12-point head heat resistant nuts for automobiles,
which have thread specifications of M5 ~ M12, material properties abbreviated as SB,
product grade of TA, working temperature below 700 °C.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 90.1 Fasteners - Acceptance inspection
GB/T 90.2 Fasteners - Marking and packaging
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 3098.8 Mechanical properties of fasteners - Parts for bolted connections for
use at temperatures -200 °C ~ +700 °C
GB/T 3098.9 Mechanical properties of fasteners - Prevailing torque type steel nuts
GB/T 3103.4 Tolerances for fasteners - Bolt/nut assemblies for service temperatures
from -200 °C ~ +700 °C
GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of
dimensions
GB/T 5779.2 Fasteners - Surface discontinuities - Nuts
GB/T 14992 Classification and designation for superalloys and high temperature
intermetallic materials
QC/T 326 Coding rules for automotive standardized parts