ISO 21982:2020 pdf download Assembly tools for screws and nuts — Ratcheting wrenches — Technical requirements
1 Scope
This document specifies the dimensions and technical requirements for ratcheting wrenches used in assembly or disassembly of hexagonal and double hexagonal fasteners.
NOTE The wrenches covered by this document are the ones identified in ISO 1703 under reference No.1 1 01 07 0, 1 1 01 08 0, 1 1 01 09 0 and 1 1 02 19 0, 1 1 02 20 0.
NOTE The wrenches according to this document are not intended for uses with impact stress of the wrench.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
ISO 691, Assembly tools for screws and nuts — Wrench and socket openings — Tolerances for general use
ISO 1711-1:2019, Assembly tools for screws and nuts — Technical specifications — Part 1: Hand-operated wrenches and sockets
ISO 3318, Assembly tools for screws and nuts — Open-ended wrenches, box wrenches and combination wrenches — Maximum widths of heads
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 7738, Assembly tools for screws and nuts — Combination wrenches — Lengths of wrenches and maximum thickness of heads
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
reversing torque
torque required to rotate the box-head ratchet of the wrench in the opposite direction to the direction of torque application
3.2
reversing device
part of a reversible ratchet that allows the direction of torque application to be changed by the movement of a lever or similar
4? Classification
Ratcheting wrenches to which this document applies are classified as combination wrenches, ratcheting and double-headed box wrenches, ratcheting (for recommended combinations of the wrench structures,see Annex A).
a) Combination wrenches, ratcheting (Type I, see Figure 1):
1) Class A: flat shape;
2) Class B: offset shape with reversing device;
3) Class C: flat shape with flexible head;
b) Double-headed box wrenches, ratcheting (Type II, see Figure 2):
1) Class A: flat shape;
2) Class B: offset shape with reversing device;
3) Class C: flat shape with flexible head.
NOTE Figures 1 and 2 show only examples and do not influence the design of the wrench.ISO 21982:2020 pdf download