SIST EN 4057-304:2009

Overview

EN 4057-304:2006 is a CEN aerospace test-method standard that defines how to measure the loop tensile strength of cable ties for harnesses at their maximum working temperature. It specifies the test setup, conditioning and test sequence to determine the force required to open (fail) a cable tie loop when maintained at its rated maximum temperature. This part is intended to be used together with EN 4057-100 (General) and EN 4057-401 (loop tensile strength test apparatus and method).

Key topics and requirements

• Scope: Procedure to determine the force required to open cable ties for aerospace applications under maximum working temperature conditions.
• Apparatus:
  • A tensile tester configured as required by EN 4057-401.
  • A laboratory oven capable of reaching the product-specified maximum working temperature (the product standard may specify values such as 50+ °C).
  • A split mandrel for mounting the specimen (per EN 4057-401).
• Test procedure (summary):
  • Mount the cable tie specimen on a split mandrel as described in EN 4057-401.
  • Condition the mounted specimen in the oven at the product standard’s maximum rated temperature for at least 3 hours.
  • While still in the oven and mounted on the mandrel, perform the loop tensile test (per EN 4057-401) and record the minimum force at failure.
• Acceptance criteria: All specimens must meet the minimum force to failure values defined in the applicable product standard for the cable tie.

Applications

• Qualification and acceptance testing of aerospace cable ties to ensure they retain required tensile performance at elevated operating temperatures.
• Supplier quality control and batch verification during production or pre-delivery inspection.
• Design validation for harness assemblies where temperature extremes affect retention strength.
• Regulatory and procurement compliance, providing objective test data referenced in procurement specifications, maintenance, and certification documentation.

Who should use this standard

• Aerospace component manufacturers and suppliers of cable ties and harness accessories.
• Test laboratories performing environmental and mechanical qualification for aerospace hardware.
• Quality assurance and engineering teams responsible for harness design, materials selection and supplier oversight.
• Procurement and certification authorities requiring standardized test evidence of high-temperature performance.

Related standards

• EN 4057-100 – Aerospace series - Cable ties for harnesses - Test methods - Part 100: General
• EN 4057-401 – Aerospace series - Cable ties for harnesses - Test methods - Part 401: Loop tensile strength

Keywords: EN 4057-304:2006, cable ties for harnesses, loop tensile strength, maximum working temperature, aerospace test methods, EN 4057, tensile tester, split mandrel, oven conditioning.