Lifting Lug / Attachment Point: Pin Diameter 50-200 mm

Component Specifications

Definition

A lifting lug, also known as an attachment point, is a precisely engineered structural component integrated into boom sections of cranes, excavators, and similar machinery. It provides a secure interface for connecting hooks, slings, or other lifting devices during assembly, maintenance, or transportation operations. These components are critical for load transfer and must withstand dynamic forces while maintaining structural integrity.

Working Principle

The lifting lug functions as a load-bearing interface that distributes tensile and shear forces through its connection to the boom structure. During lifting operations, the lug transfers the applied load from the lifting device into the boom's main structural members through mechanical fastening or welding. Proper design ensures the load path follows the boom's strongest axes while minimizing stress concentrations.

Materials

High-strength low-alloy steel (HSLA) grades such as ASTM A572 or equivalent, with yield strengths typically ranging from 345-690 MPa. May include specialized alloys for corrosive environments. Heat treatment and surface finishing specifications vary based on application requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pin Diameter	50-200 mm
Load Capacity	5-50 tons (design dependent)
Safety Factor	Minimum 4:1 for static loads
Surface Treatment	Hot-dip galvanizing or industrial painting
Temperature Range	-40°C to +120°C
Weld Requirements	Full penetration welds with NDT inspection

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 17096, DIN 15401, ASME BTH-1

Parent Products

This component is used in the following industrial products

Boom Sections

Boom sections are the nested, sliding segments that make up a telescopic boom, allowing it to extend and retract to varying lengths.

View Product Details

Telescopic Sections (for telescopic booms)

Nested cylindrical or box-section components that extend and retract to adjust the length of a telescopic boom.

View Product Details

Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Corrosion in harsh environments
Improper installation causing stress concentrations
Overloading beyond rated capacity
Weld defects leading to structural failure

FMEA Triads

Trigger: Material fatigue from repeated loading cycles
Failure: Crack propagation leading to sudden fracture
Mitigation: Regular ultrasonic testing, design with fatigue-resistant geometries, proper material selection

Trigger: Corrosive environment exposure
Failure: Reduced cross-sectional area and strength degradation
Mitigation: Protective coatings, corrosion-resistant alloys, regular surface inspections

Trigger: Improper sling angle during lifting
Failure: Side loading causing bending stresses beyond design limits
Mitigation: Operator training, angle indicators, load monitoring systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1.5 mm on critical dimensions, angular tolerance ±0.5°

Test Method

Proof load testing at 150% rated capacity, magnetic particle inspection, ultrasonic thickness measurement

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Lifting Lug / Attachment Point

Manufacturer profiles associated with Lifting Lug / Attachment Point.

Sourcing Lifting Lug / Attachment Point from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What is the difference between a lifting lug and a regular attachment point?

Lifting lugs are specifically engineered for dynamic lifting operations with calculated safety factors, while general attachment points may serve multiple purposes with lower load requirements.

How often should lifting lugs be inspected?

Visual inspection before each use, detailed inspection every 6 months, and certified inspection annually as per ISO 17096 requirements.

Can lifting lugs be welded in the field?

Only by certified welders following approved procedures with proper pre/post-weld heat treatment and non-destructive testing verification.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Lifting Lug / Attachment Point