1 Scope
This Standard specifies the general characteristics of forged dee and bow shackles in Grades 4, 6 and 8, and presents their performance and critical dimensions necessary for their interchangeability and compatibility with other components.
This Standard is applicable to the forged dee and bow shackles in a range of sizes having working load limits of from 0.32 t to 100 t.
In the case of dee shackles for use with forged steel lifting hooks in conformance with GB/T 24812 and GB/T 24813, an intermediate component could be necessary for making the connection.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 193 General Purpose Metric Screw Threads — General Plan (GB/T 193-2003, ISO 261:1998, MOD)
GB/T 197-2003 General Purpose Metric Screw Threads — Tolerances (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 230.1-2004, ISO 6508-1:1999, MOD)
GB/T 231.1 Metallic Materials — Brinell Hardness Test — Part 1: Test Method) (GB/T 231.1-2002, eqv ISO 6506-1:1999)
GB/T 6394-2002 Metal-methods for Estimating the Average Grain Size (ASTM E112:1996, MOD)
GB/T 13304.1 Steels Classification — Part 1: Classification of According to Chemical Composition (GB/T 13304.1-2008, ISO 4948-1:1982, MOD)
GB/T 24812.4 Forged Steel Lifting Hooks with Point and Eye for Use with Steel Chains of Grade 4 (GB/T 24812-2009, ISO 4779:1986, IDT)
GB/T 24813.8 Forged Steel Lifting Hooks with Point and Eye for Use with Steel Chains of Grade 8 (GB/T 24813-2009, ISO 7597:1987, IDT)
3 Terms and Definitions
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Form and Dimensions
5 Mechanical Properties
6 Material
7 Heat Treatment
8 Hardness
9 Workmanship
10 Screw Threads
11 Type Testing
12 Proof Test
13 Manufacturer’s Certificate
14 Marking
Appendix A (Normative) Formulae for Calculating Shackle Dimensions
Appendix B (Informative) Designation
