GB/T 3098.3-2016Mechanical properties of fasteners -- Set screws (English PDF)

Foreword

GB/T 3098 Mechanical Properties of Fasteners include the following parts.

--- GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs;

--- GB/T 3098.2 Mechanical Properties of Fasteners - Nuts;

--- GB/T 3098.3 Mechanical Properties of Fasteners - Set Screws;

--- GB/T 3098.4 Mechanical Properties of Fasteners – Nuts - Fine Pitch Thread;

--- GB/T 3098.5 Mechanical Properties of Fasteners - Tapping Screws;

--- GB/T 3098.6 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws

and Studs;

--- GB/T 3098.7 Mechanical Properties of Fasteners - Thread Rolling Screws;

--- GB/T 3098.8 Mechanical Properties of Fasteners - Components for Bolted

Connections Made Mainly from Materials with a High Temperature Strength;

--- GB/T 3098.9 Mechanical Properties of Fasteners - Prevailing Torque Type Steel

Hexagon Nuts;

--- GB/T 3098.10 Mechanical Properties of Fasteners - Bolts, Screws, Studs and

Nuts Made of Non-Ferrous Metals;

--- GB/T 3098.11 Mechanical Properties of Fasteners - Drilling Screws with Taping

Screw Thread;

--- GB/T 3098.12 Mechanical Properties of Fasteners - Cone Proof Load Test on

Nuts;

--- GB/T 3098.13 Mechanical Properties of Fasteners - Torsional Test and Minimum

Torques for Bolts and Screws with Nominal Diameters 1mm to 10mm;

--- GB/T 3098.14 Mechanical Properties of Fasteners - Widening Test on Nuts;

--- GB/T 3098.15 Mechanical Properties of Fasteners - Nuts Made of Stainless-

Steel;

--- GB/T 3098.16 Mechanical Properties of Fasteners - Stainless Steel Set Screws;

--- GB/T 3098.17 Mechanical Properties of Fasteners - Preloading Test for the

Detection of Hydrogen Embrittlement - Parallel Bearing Surface Method;

--- GB/T 3098.18 Mechanical Properties of Fasteners - Blind Rivets Testing;

--- GB/T 3098.19 Mechanical Properties of Fasteners - Blind Rivets with Break Pull

Mandrel;

--- GB/T 3098.20 Mechanical Properties of Fasteners - Wing Nuts with Specified

Proof Torque;

--- GB/T 3098.21 Mechanical Properties of Fasteners - Stainless Steel Tapping

Screws;

--- GB/T 3098.22 Mechanical Properties of Fasteners - Made of the Fine Grain Non-

Heat Treatment Steel - Bolts, Screws and Studs.

This Part belongs to Part 3 of GB/T 3098.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 3098.3-2000 Mechanical Properties of Fasteners – Set

Screws; compared with GB/T 3098.3-2000, the major technical changes are as follows.

--- Expand the thread specification from d=24mm to d=30mm, and specified the fine

pitch thread of M8×1~M30×2(Chapter 1);

--- Replace "property class" by "hardness grade"; add "only applicable to the

compressive stress" (Chapter 1);

--- Add "the usage temperature of fastener produced as per this Part is -

50°C~+150°C. when the usage temperature exceeds the range of -

50°C~+150°C, or as higher as +300°C, the users shall consult the relative parties"

(Chapter 1);

--- Add terms and definitions, as well as codes (Chapter 3, Chapter 4);

--- Add "if the mechanical and physical properties specified in Table 2 and Table 3

are conformed to, then the marking system of hardness grade specified in this

Part can also use the specification exceeding the standard scope (d >30mm)"

(Chapter 5);

--- For 45H-grade alloy steel, add "f these alloy steel shall contain at least one of the

following elements, thereof the minimum content is 0.30% chromium, 0.30%

nickel, 0.20% molybdenum, 0.10% vanadium. When containing two, three or four

composite alloy compositions, the alloying element content shall be no less than

70% total content sum of single alloying element" (Table 2).

--- For Class 22H~45H mechanical and physical properties and the table note,

increase "no carburization HV0.3" and "when adopting the measuring surface

hardness and core hardness of HV0.3, the surface hardness of fastener shall be

no 30HV higher than the core hardness (see Figure 3)" (Table 3);

Mechanical Properties of Fasteners – Set Screws

1 Scope

This Part of GB/T 3098 specifies the mechanical and physical properties of set screws

and similar threaded fasteners with specified hardness classes, which are

manufactured by carbon steel or alloy steel, and tested at the environmental

temperature of 10°C~35°C. At such environmental temperature range, assess the

fasteners (including set screws and similar threaded fasteners with specified hardness

classes, the same below) as per the requirements of this Part. The fasteners meeting

the requirements of this Part shall be classified as per the specified hardness class,

and are only applicable to the compressive stress.

NOTE. The applicable usage temperature of fasteners produced as per this Part is -

50°C~+150°C. When the usage temperature exceeds the range of -50°C~+150°C, even as

higher as +300°C, the users shall consult to the relative parties.

This Part applicable set screws and similar threaded fasteners.

--- Manufactured by carbon steel or alloy steel;

--- Conform to the ordinary thread specified in GB/T 192;

--- Coarse pitch thread M1.6~M30; fine pitch thread M8×1~M30×2;

--- Conform to the diameter and pitch combination specified in in GB/T 193 and

GB/T 9144;

--- Conform to the thread tolerance specified in GB/T 197 and GB/T 9145.

This Part didn't specify the following property requirements.

--- Tensile strength;

--- Shear strength;

--- Weldability;

--- Corrosion resistance;

--- Property requirement with working temperature higher than +150°C or lower than

-50°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) are applicable to this standard.

GB/T 90.3 Fasteners—Quality Assurance System (GB/T 90.3-2010, ISO

16426.2002, IDT)

GB/T 192 General Purpose Metric Screw Threads-Basic Profile (GB/T 192.2003,

ISO 68-1. 1998, MOD)

GB/T 193 General Purpose Screw Threads--Diameters and Pitches (GB/T 193-

2003, ISO 261.1998, MOD)

GB/T 197 General Purpose Metric Screw Threads – Tolerances (GB/T 197-2003,

ISO 965-1.1998, MOD)

GB/T 230.1 Metallic Rockwell Hardness Test - Part 1. Test Method (Scales A, B,

C, D, E, F, G, H, K, N, T) (GB/T 230.1-2009, ISO 6508-1.2005, MOD)

GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method (GB/T

231.1-2009, ISO 6506-1.2005, MOD)

GB/T 2516 General Purpose Metric Screw Threads - Limit Deviations (GB/T 2516-

2003, ISO 965-3.1998, MOD)

GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1. Test Method

(GB/T 4340.1-2009, ISO 6507-1.2005, MOD)

GB/T 5267.1 Fasteners - Electroplated Coatings (GB/T 5267.1-2002, ISO

4042.1999, IDT)

GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions

of Dimensions (GB/T 5276-2015, ISO 225. 2010, MOD)

GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for

General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)

GB/T 9144 General Purpose Metric Screw Threads - Preferable Plan (GB/T 9144-

2003, ISO 262.1998, MOD)

GB/T 9145 General Purpose Screw Threads - Limits of Sizes for Commercial Bolt

and Nut Threads - Medium Quality (GB/T 9145-2003, ISO 965-2.1998, MOD)

3 Terms and Definitions

The following terms and definitions are applicable to this document.

8 Applicability of Test Method