Standard No.:	QC/T 1255-2025
English Name:	Square nut for automobile
Chinese Name:	汽车用方螺母
Professional Classification:	QC    Professional Standard - Automobile
Source Content Issued by:	MIIT
Issued on:	2025-12-17
Implemented on:	2026-7-1
Status:	to be valid
Target Language:	English
File Format:	PDF
Word Count:	2000 words
Translation Price(USD):	60.0
Delivery:	via email in 1~3 business day

QC/T 1255-2025 Square nut for automobile English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS T Professional Standard of the People's Republic of China QC/T 1255-2025 Square nut for automobile 汽车用方螺母 (English Translation) Issue date: 2025-12-17 Implementation date: 2026-07-01 Issued by the Ministry of Industry and Information Technology of the People's Republic of China Contents Foreword 1 Scope 2 Normative References 3 Terms and Definitions 4 Type Dimensions 5 Technical Requirements 6 Product Numbering Square Nuts for Automotive Use 1 Scope This document specifies the types and dimensions, performance requirements, technical conditions, and product numbering for square nuts for automotive use. This document applies to square nuts for automotive use with nominal thread diameter D=5 mm to 12 mm, mechanical property classes 8 and 10, and product grade A. 2 Normative References The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition corresponding to the date applies. For undated references, the latest edition (including all amendments) applies. GB/T 90.1 Fasteners — Inspection and Acceptance GB/T 90.2 Fasteners — Marking and Packaging GB/T 196 Basic Dimensions of General Purpose Metric Threads GB/T 197 General Purpose Metric Screw Threads — Tolerances GB/T 3098.2 Mechanical Properties of Fasteners — Nuts GB/T 3103.1 Fasteners — Tolerances — Bolts, Screws, Studs and Nuts GB/T 5276 Fasteners — Bolts, Screws, Studs and Nuts — Symbols and Designations of Dimensions GB/T 5779.2 Fasteners — Surface Discontinuities — Nuts GB/T 30512 Requirements for Prohibited Substances in Automobiles QC/T 326 Product Numbering Rules for Automotive Fasteners QC/T 625 Coatings and Chemical Treatment Layers for Automotive Use 3 Terms and Definitions This document does not define any specific terms and definitions. 4 Types and Dimensions The types and dimensions for square nuts for automotive use shall be as shown in Figure 1 and Table 1. Symbols and designations of dimensions shall comply with the provisions of GB/T 5276. 5 Technical Conditions The technical conditions for square nuts for automotive use shall comply with the provisions of Table 2. Table 2 Technical Conditions 6 Product Numbering The product numbering for square nuts for automotive use shall comply with the provisions of QC/T 326.