ISO 5747:1995

Overview

ISO 5747:1995 - "Pliers and nippers - Lever assisted side cutting pliers, end and diagonal cutting nippers - Dimensions and test values" specifies the principal dimensions and required test values for lever‑assisted side‑cutting pliers and for end and diagonal cutting nippers. The document defines dimensional tables, load and cutting tests (to verify functioning), permissible permanent set after load tests, and formulas to adapt test loads for different handle and jaw geometries. General technical requirements and test methods are referenced to ISO 5743 and ISO 5744.

Key topics and requirements

• Scope of tools covered: lever‑assisted side cutting pliers, lever‑assisted end cutting nippers, and lever‑assisted diagonal cutting nippers for hard wire.
• Principal dimensions: standardized dimensions are provided in figures and tables for each tool type (jaw opening, handle widths, lengths, etc.).
• Test values and methods: cutting force, maximum test wire diameter, load test values and locations are specified; tests are to be performed in accordance with ISO 5744.
• Permissible permanent set: limits for permanent deformation after load tests are listed in the tables.
• Adjustment formulas: mathematical formulas are provided to calculate equivalent test loads when the measured distance from the joint or the lever ratio differs from the table values.
• Lever ratio considerations: requirements account for lever ratio effects on cutting force and provide a method to correct for different lever ratios.
• Design note: the standard gives example geometries for lever‑assisted pliers but does not constrain innovative manufacturer designs.

Practical applications

• Product design and manufacturing: tool designers use ISO 5747 to dimension pliers and nippers and to ensure tools meet standardized performance and durability metrics.
• Quality control and testing: manufacturers and test labs apply the specified load/cutting tests and permanent set limits to verify compliance and batch quality.
• Procurement and specification: buyers and procurement teams reference ISO 5747 in purchase specifications to ensure interchangeability and expected performance.
• Safety and compliance: maintenance teams, safety inspectors and regulatory bodies use the standard to assess tool suitability for professional use, particularly when cutting hard wire.

Who uses this standard

• Hand tool manufacturers and mechanical designers
• Quality assurance and laboratory testing personnel
• Purchasing/specification engineers for industrial maintenance and assembly
• Standards bodies and conformity assessment organizations

Related standards

• ISO 5743: Pliers and nippers - General technical requirements (normative reference for general aspects).
• ISO 5744: Pliers and nippers - Methods of test (normative reference for test procedures).
• Prepared by ISO/TC 29 (Small tools).

Keywords: ISO 5747, pliers and nippers, lever assisted side cutting pliers, end cutting nippers, diagonal cutting nippers, dimensions and test values, hand tool standards, tool testing, cutting force, permanent set, ISO 5744, ISO 5743.