ELECTRICAL APPLIANCES CO., LTD. Standard Parts Inspection Standards (Nuts) Document Code Page Page 1 of 8 Prepared Date 2013.01.10 Preparation Audit Approval No. Name of Title Page 1 Scope ---------------- -------------------------------------------------- ---------------------------------- 2 2 Normative references ---------- -------------------------------------------------- ------------------------- 2 3 Terms and definitions -------------------- -------------------------------------------------- --------------------- 2 4 Requirements -------------------------- -------------------------------------------------- ------------------------ 2 4.1 nut features and uses ------------------- -------------------------------------------------- --------------- 2 4.2 Type Specifications ------------------------------- -------------------------------------------------- --------------- 3 4.2.1 Hex nuts ----------------------------- -------------------------------------------------- ---------------- 3 4.2.2 Type I Hex Nut -------------------------- ----------
-------------------------------------------------- --- 3 4.2.3 hexagonal thin nut ---------------------------------------- -------------------------------------------------- --3 4.2.4 Hexagon Thick Nut ----------------------------------------- -------------------------------------------------- -4 4.3 Size specifications of commonly used hex nuts ----------------------------------------- ---------------------------------- 4 4.4 - Appearance Quality ----------- -------------------------------------------------- ----------------------- ---------- 5 4.5 Mechanical Properties ------------- -------------------------------------------------- ---------------------- ---------- 5 5 Test Methods -------------------------------------------------- ------------------------------ 5 5.1 nut test characteristics -------------------------------------------------- ----------------------- 5 5.2 Visual Inspection ----------------------- -------------------------------------------------- ---------------------- 5 5.2.1 Surface Level -----------------
-------------------------------------------------- ---------------------------- 5 5.2.2 Test Environment ---------------- -------------------------------------------------- ----------------------------- 6 5.2.3 Defect level --------------- -------------------------------------------------- ------------------------------ 6 5.2.4 Test Method -------------- -------------------------------------------------- ------------------------------- 6 5.2.4.1 General inspection ------------- -------------------------------------------------- ------------------------------- 7 5.2.4.2 plating (enamel, coating) layer test ------- -------------------------------------------------- ------------------- 7 5.2.4.3 Type Specification Checking ------------------------ -------------------------------------------------- -------------- 7 5.2.4.4 Mechanical Properties Testing ----------------------------- -------------------------------------------------- --------- 7 5.2.4.5 Packaging, marking, transport inspection ------------------------------- ------------------------------------------
--- 7 6 Inspection Rules ------------------------------------------- -------------------------------------------------- 7 6.1 Inspection and acceptance --------------------------------------------- 6.2 Inspection program -------------------------------------------------- -------------------------------------------- 7 6.3 Inspection items - -------------------------------------------------- ------------------------------------------ 7 6.4 Determination and treatment of test results -------------------------------------------------- --------------------------- 7 7 logo, packaging, transportation, storage -------------- -------------------------------------------------- -------- 8 7.1 mark --------------------------------------- -------------------------------------------------- ------------ 8 7.2 Packaging, transport and storage ------------------------------- -------------------------------------------------- --8 Electrical Appliance Co., Ltd. Standard Parts Inspection Standards (Nuts) Document No. Page 2 of 8 Date of Preparation 2013
.01.10 Preparation audit approval 1 Scope This standard specifies the standard parts (nuts) requirements, test methods, inspection rules, packaging, marking, transportation, storage and so on.
This standard applies to the company's standard parts (nuts) into the factory inspection and testing.
2 Normative references The following documents contain provisions which, through reference in this section, become the provisions of this section.
For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to reach an agreement under this section to study the possibility of using the latest version of these documents .
For undated references, the latest version applies to this section.
GB / T 41-2000 GB / T 56-1988 GB / T 6170-2000 GB / T 6172.1-2000 3 Terms 3.1 Definition of large diameter (D, d) and external thread teeth or internal thread bottom coincide The diameter of the cylinder.
3.2 Trail (D1, d1) Diameter of the imaginary cylinder coinciding with the internal thread or external thread bottom.
3.3 Nominal diameter on behalf of the diameter of the thread size, refers to the basic size of large diameter Bolt.
3.4. Diameter (D2, d2) The diameter of an imaginary cylinder passing through the upper groove and the width of the protrusion equal.
3.5 single diameter diameter of an imaginary cylinder, the cylinder through the tooth-shaped groove on the groove width equal to half the basic pitch.
3.6 acting diameter diameter within the prescribed length of rotation just inclusive of the imaginary thread diameter of the actual thread, the hypothetical thread with the basic tooth-type pitch, half-width and height of the tooth, and in the teeth, the tooth bottom left gaps , In order to ensure that not with the actual thread large, minor interference.
3.7 Pitch (P) The adjacent two teeth in the median line corresponds to the axial distance between two points.
4 Requirements 4.1 Characteristics and Uses of Nuts 4.1.1 Hex Nuts 4.1.1.1 Hex nuts are divided into three grades of A, B and C in the same way as the bolts, with the highest A grade and the lowest C grade.
A-level nut diameter D