SIST EN 1677-5:2001+A1:2009

SIST EN 1677-5:2001+A1:2009 is the Slovenian adoption of the CEN European Standard EN 1677-5:2001+A1:2008. It specifies safety requirements for forged steel lifting hooks with latch, grade 4, up to 31.5 t WLL, for lifting objects, materials or goods. The document is aimed at hook manufacturers, sling makers, test labs, quality managers and users who need defined dimensions, materials, proof testing, marking and certification.

What does SIST EN 1677-5:2001+A1:2009 specify?

SIST EN 1677-5:2001+A1:2009 specifies the safety requirements for forged steel lifting hooks of grade 4 with a latch and eye. It is mainly intended for use with chain slings, steel wire rope slings and textile slings, and it excludes hand forged hooks.

The document is organized into clauses 1 to 9 covering scope, normative references, terms and definitions, hazards, safety requirements, verification of safety requirements, marking, manufacturer’s certificate, and instructions for use. It also includes informative annexes for calculation bases, designation, and links to EU machinery directives.

What are the key requirements of SIST EN 1677-5:2001+A1:2009?

SIST EN 1677-5:2001+A1:2009 sets requirements for design, dimensions, materials, strength, latch performance and verification. In practice, these clauses tell a manufacturer what to build, how to test it, and what evidence to keep before the hook can be marked and sold.

Design and dimensions

The hook body must have an eye-type upper end and a spring-loaded latch. The shape must allow articulation so the load is transmitted in the intended direction, and the latch must help prevent accidental unhooking.

Table 2 links the code number and WLL to the main dimensions. The hook must also meet specific geometric conditions: the point height must be at least the throat opening, the throat opening must not exceed 95% of the seat diameter, and the latch must close over the maximum bar diameter that can pass through the throat. This matters because fit and geometry affect both load path and compatibility with slings.

Materials, heat treatment and workmanship

The steel must be produced by an electric process or an oxygen blown process, be fully killed, resist strain age embrittlement, and have a fine grain size. The chemical limits in Tables 3 and 4 control sulfur, phosphorus and silicon, which helps protect strength and service behaviour, including use in galvanizing baths.

Each hook must be hot forged in one piece, cleaned of excess metal and freed from harmful defects after heat treatment. Welding is tightly limited, and any welds must be smoothly finished. Hooks must be hardened and tempered, or normalized, before the manufacturing proof force is applied.

Mechanical performance and latch behavior

The manufacturing proof force is based on twice the WLL, and the breaking force is based on four times the WLL. The hook must withstand proof loading without dimensional change outside the permitted limits, and the static tensile test must show the specified minimum breaking force.

The latch must close positively in any orientation, not rely on gravity, and remain functional through repeated use. Table 5 gives guidance on opening torque, and the latch type test applies forces f1 and f2 to check resistance to deformation. The spring must survive at least 10,000 complete openings without fracture.

Verification, marking and records

Type tests are required on three samples of each size, design, material, heat treatment and manufacturing method. Manufacturing proof tests are also required, with lot sampling rules depending on whether an EN ISO 9002 quality system is operating. Each hook must be marked with the code number, grade 4, the manufacturer’s mark and a traceability code.

After satisfactory testing, the manufacturer must issue a certificate identifying the standard, hook code, quantity, WLL and proof force, and confirming the minimum breaking force. Records of materials, heat treatment, dimensions and test results must be kept for at least 10 years.

What terms does SIST EN 1677-5:2001+A1:2009 define?

• Working load limit (WLL) - the maximum mass a hook is authorized to sustain in general lifting service.
• Manufacturing proof force (MPF) - the force used in the manufacturing proof test.
• Breaking force (BF) - the maximum force reached in the static tensile test when the hook fails to retain the load.
• Traceability code - the marked letters and/or numbers that allow the hook’s manufacturing history to be traced.
• Competent person - a trained and qualified person able to carry out the required test and examination.
• Lot - a specified number of hooks made from the same cast of steel and heat-treated in the same process.

Who uses SIST EN 1677-5:2001+A1:2009?

Manufacturers use SIST EN 1677-5:2001+A1:2009 to design, forge, heat-treat, test and mark grade 4 hooks. Sling assemblers use it when selecting hooks for chain slings, steel wire rope slings and textile slings.

Quality managers and test laboratories use it for type testing, proof testing, lot acceptance and record keeping. Buyers and users in lifting equipment supply chains use it to specify the correct hook type, WLL, marking and certification for lifting objects, materials or goods.

What changed in SIST EN 1677-5:2001+A1:2009 from the previous edition?

SIST EN 1677-5:2001+A1:2009 supersedes EN 1677-5:2001. It also includes Amendment 1, approved by CEN on 2008-09-09.

Which standards are used with SIST EN 1677-5:2001+A1:2009?

• EN 292-1 and EN 292-2:1991/A.1:1995 - general machinery safety principles and technical design principles.
• EN 1050:1996 - risk assessment principles used for identifying hazards.
• EN 818-5 - chain slings that commonly use these hooks.
• EN 818-6 - information for use and maintenance of chain slings.
• EN 1492-1 and EN 1492-2 - textile sling types named in the scope.
• prEN 13414-1:1998 - steel wire rope slings named in the scope.
• EN 10002-2:1991 - verification of tensile testing machines used for hook tests.
• EN 10025:1990+A1:1993 and ISO 643:1983 - steel quality and grain size references for material control.
• EN 45012 and EN ISO 9002:1994 - quality system and certification references used in manufacturing control.
• EN 1677-1, -2, -3, -4 and -6 - the other parts of the EN 1677 series for related sling components.

What does the SIST EN 1677-5:2001+A1:2009 document contain?

SIST EN 1677-5:2001+A1:2009 contains a hazard table, a dimension figure, dimension tables, material composition tables, latch torque guidance, a latch force test figure and lot-size rules. It also gives formulas in Annex A for deriving hook dimensions from WLL and a designation format in Annex B.

For testing and conformity work, the document sets out type tests, deformation tests, static tensile tests, manufacturing proof tests and latch tests. For administrative control, it defines marking, the contents of the manufacturer’s certificate and the records that must be retained.