BS 4429:1987

Foreword
Committees responsible
Specification
Section one. General requirements
1.1 Scope
1.2 Definitions
1.3 Lifting applications
1.4 Size
1.5 Tolerance on dimensions
1.6 Heat treatment
1.7 Hot dip galvanizing
1.8 Screw threads
1.9 Freedom from defects
1.10 Proof loading
1.11 Marking
1.12 Test certificate
Section two. Specific requirements for rigging screws
2.1 General
2.2 Tubular body
2.3 Workmanship
2.4 Attachments
2.5 Types of rigging screw
2.6 Open and closed dimensions
2.7 Safe working loads
Section three. Specific requirements for turnbuckles
3.1 General
3.2 Designation
3.3 Open body
3.4 Workmanship
3.5 Attachments
3.6 Types of turnbuckle
3.7 Open and closed dimensions
3.8 Safe working loads
Section four. Specific requirements for attachments
4.1 General
4.2 Screwed elongated eyes
4.3 Screwed forks
4.4 Screwed trapezoidal hooks
4.5 Lock-nuts
Appendices
A Information to be supplied by the purchaser with
      the enquiry and order
B Notes on design
C Selection, application and use of rigging screws
      and turnbuckles for lifting applications
Tables
1 Recommended maximum sizes of marking stamps
2 Tubular bodies for rigging screws
3 Open and closed dimensions (H) and safe working
      loads for rigging screws
4 Hexagon-ended open bodies for turnbuckles
5 Open and closed dimensions (H) and safe working
      loads for turnbuckles
6 Screwed elongated eyes
7 Screwed forks (supplied complete with bolt and
      nut)
8 Screwed trapezoidal hooks for turnbuckles
9 Types of defect found in in-service inspections
      and actions to be taken in the event of a defect
Figures
1 Tubular body for rigging screws
2 Types of rigging screw
3 Hexagon-ended open body for turnbuckles
4 Types of turnbuckle
5 Screwed elongated eye
6 Screwed fork
7 Screwed trapezoidal hook for turnbuckles

Materials, components, dimensions, finishes and tests for rigging screws (8-100 mm thread size) and turnbuckles (8-72 mm thread size).

This British Standard specifies materials, components, dimensions, finishes and tests for rigging screws and turnbuckles of the following types and nominal sizes for both lifting and non-lifting applications.

Rigging screws : 8 mm to 100 mm, size of screw thread

Turnbuckles, : 8 mm to 72 mm, size of screw thread

series no. 1,

series no. 2 and

pipe hanger

applications

Lock-nuts are also covered (see section four).

Attachments for turnbuckles for use in pipe hanger applications are excluded from this British Standard (see BS 3974 : Part 1 ).

NOTE. The titles of the publications referred to in this standard are listed on the inside back cover.