1 Scope
This part of GB/T 3098 specifies mechanical and physical properties of set screws and similar threaded fasteners made of carbon steel or alloy steel when tested at an ambient temperature range of 10℃ to 35℃. Fasteners (the term used when set screws and similar threaded fasteners are considered all together) which conform to the requirements of this part are evaluated at that ambient temperature range. Fasteners in conformance with this part are classified to specified hardness classes and are intended for use under compressive stress only.
Note: Fasteners conforming to the requirements of this part are used in applications ranging from -50℃ to +150℃. It is the responsibility of users to consult the parties concerned for temperatures outside the range of -50℃ to +150℃ and up to a maximum temperature of +300℃.
This part is applicable to set screws and similar threaded fasteners:
——made of carbon steel or alloy steel;
——having a general purpose metric screw thread in conformance with GB/T 192;
——with a coarse pitch thread of M1.6 to M30, and a fine pitch thread of M8×1 to M30×2;
——with diameter/pitch combinations in conformance with GB/T 193 and GB/T 9144;
——having thread tolerances in conformance with GB/T 197 and GB/T 9145.
It does not specify requirements for such properties as:
——tensile strength;
——shear strength;
——weldability;
——corrosion resistance;
——the ability to withstand temperatures above +150℃ or below -50℃.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 90.3 Fasteners - Quality Assurance System (GB/T 90.3-2010, ISO 16426:2002, IDT)
CB/T 192 General Purpose Metric Screw Threads - Basic Profile (GB/T 192:2003, ISO 68-1:1998, MOD)
GB/T 193 General Purpose Metric Screw Threads - General Plan (GB/T 193-2003, ISO 261:1998, MOD)
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Symbols
5 Designation System
6 Materials
7 Mechanical and Physical Properties
8 Applicability of Test Methods
9 Test Methods
10 Marking
Annex A (Informative) Hydrogen Embrittlement Relief after Electroplating of Set Screws
