GB/T 15856.5-2023 English PDF (GBT15856.5-2023)

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GB/T 15856.5-2023: Hexagon washer head drilling screws with tapping screw thread
GB/T 15856.5-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
CCS J 13
Replacing GB/T 15856.5-2002
Hexagon washer head drilling screws with tapping screw
thread
六角凸缘自钻自攻螺钉
(ISO 15480:2019, Fasteners - Hexagon washer head drilling screws
with tapping screw thread, MOD)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 8
4 Types and dimensions ... 8
5 Technical requirements ... 10
6 Marks and labels ... 11
7 Marking ... 11
References ... 12
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document is part 5 of GB/T 15856 Drilling screws with tapping screw thread. The
following parts of GB/T 15856 have been issued:
-- GB/T 15856.1 Cross recessed pan head drilling screws with tapping screw thread;
-- GB/T 15856.2 Cross recessed countersunk head drilling screws with tapping
screw thread;
-- GB/T 15856.3 Cross recessed raised countersunk head drilling screws with
tapping screw thread;
-- GB/T 15856.4 Hexagon flange head drilling screws with tapping screw thread;
-- GB/T 15856.5 Hexagon washer head drilling screws with tapping screw thread.
This document replaces GB/T 15856.5-2002 Hexagon washer head drilling screws with
tapping screw thread. Compared with GB/T 15856.5-2002, except for the structural
adjustment and editorial revisions, the main technical changes are as follows:
a) The diameter da and the corresponding value are added (see Figure 1 and Table
1);
b) lg is changed to lm (see Figure 1 and Table 1; see Figure 1 and Table 1 of the
2002 edition);
c) r1 is changed to the specified minimum value (see Table 1; see Table 1 of the
2002 edition);
d) The requirements for marks and labels are added (see Chapter 6).
This document is modified in relation to ISO 15480:2019 Fasteners - Hexagon washer
head drilling screws with tapping screw thread.
Compared with ISO 15480:2019, the following structural adjustments are made to this
document:
-- The chapter “Marks and labels” is added;
-- Chapter 7 corresponds to Chapter 6 of ISO 15480:2019.
Hexagon washer head drilling screws with tapping screw
thread
1 Scope
This document specifies the types and dimensions, technical conditions, marks and
labels, and marking of hexagon washer head drilling screws with tapping screw thread.
This document is applicable to hexagon washer head drilling screws with tapping screw
thread with thread specifications of ST 2.9 ~ST 6.3, made of steel, and of product grade
A.
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 90.1 Fasteners - Acceptance inspection (GB/T 90.1-2023, ISO 3269:2019,
MOD)
GB/T 90.2 Fasteners - Marking and packaging
GB/T 1237 Designation system for fasteners (GB/T 1237-2000, eqv ISO
8991:1986)
GB/T 3098.11 Mechanical properties of fasteners - Drilling screws with tapping
screw thread (GB/T 3098.11-2002, idt ISO 10666:1999)
GB/T 3099.4 Terminology of fasteners - Control, inspection, delivery, acceptance
and quality (GB/T 3099.4-2021, ISO 1891-4:2018, MOD)
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts (GB/T 3103.1-
2002, idt ISO 4759-1:2000)
GB/T 5267.1 Fasteners - Electroplate coating (GB/T 5267.1-2023, ISO 4042:2022,
MOD)
GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of
6 Marks and labels
6.1 Product marks
The product marks shall be in accordance with the provisions of GB/T 3098.11.
6.2 Packaging labels
Packaging labels shall comply with the provisions of GB/T 3098.11, at least including
the following content:
-- the number of this document, i.e. GB/T 15856.5;
-- the thread specification and nominal length l;
-- the type of surface treatment;
-- the identification mark or name of the manufacturer and/or distributor;
-- The manufacturing batch number specified in GB/T 3099.4;
-- the number of packages.
7 Marking
The marking method shall be in accordance with the provisions of GB/T 1237.
EXAMPLE: For a hexagon washer head drilling screw with tapping screw thread with a thread
specification of ST3.5, a nominal length l of 16 mm, and an untreated surface, which is made of steel, of
product grade A, and has the mechanical properties that are in accordance with GB/T 3098.11, the mark
is as follows:
Drilling screw with tapping screw thread GB/T 15856.5 ST 3.5×16