Lacings: Diameter/Thickness 10-50 mm typical

Component Specifications

Definition

Lacings are diagonal or cross-shaped structural members in lattice boom construction that connect main chords to form triangular truss patterns. They transfer shear forces between chords, increase moment of inertia, and prevent local/global buckling under compressive and bending loads. Critical for maintaining geometric stability and load distribution in telescoping or fixed lattice sections.

Working Principle

Lacings work by creating triangulated truss structures that convert applied loads (compression, tension, bending) into axial forces along their length. They distribute stresses evenly across the boom cross-section, reduce unsupported chord length (slenderness ratio), and enhance torsional rigidity through geometric bracing patterns (single lacing, double lacing, or K-bracing).

Materials

High-strength low-alloy steel (HSLA) ASTM A572 Grade 50 or equivalent; yield strength ≥345 MPa, tensile strength ≥450 MPa. Corrosion-resistant coatings: hot-dip galvanizing (ISO 1461) or epoxy paint (ISO 12944).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pattern	Single diagonal, double diagonal, or K-type
Connection	Bolted (grade 8.8 bolts) or welded (fillet welds per AWS D1.1)
Cross Section	Round bar, flat bar, or angle iron
Spacing Ratio	L/r ≤ 200 per ASME B30.5
Diameter/Thickness	10-50 mm typical

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 4301-1, DIN 15018, FEM 1.001

Parent Products

This component is used in the following industrial products

Lattice Boom

A structural component of a lattice boom crane consisting of interconnected steel members forming a truss structure for load lifting and positioning.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking at connection points
Corrosion-induced section loss
Buckling due to improper slenderness ratio
Overload causing permanent deformation

FMEA Triads

Trigger: Cyclic loading and stress concentration at bolted/welded joints
Failure: Fatigue crack propagation leading to lacing fracture
Mitigation: Regular NDT inspections (ultrasonic testing), use of fatigue-resistant details (rounded edges), and proper preload in bolted connections

Trigger: Exposure to corrosive environments (marine, industrial)
Failure: Section loss reducing load-bearing capacity
Mitigation: Apply protective coatings (galvanizing, epoxy), implement corrosion monitoring, and schedule preventive maintenance

Trigger: Design error (excessive slenderness ratio L/r)
Failure: Elastic buckling under compressive loads
Mitigation: Follow ASME B30.5 spacing rules, use double lacings for long spans, and validate with FEA analysis

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Length tolerance ±2 mm per 1000 mm; straightness tolerance ≤1/1000 of length

Test Method

Load testing per ISO 4301 (1.25x rated load), ultrasonic testing for weld integrity, hardness testing per ISO 6506

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

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

Manufacturers of Lacings

Manufacturer profiles associated with Lacings.

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Frequently Asked Questions

What is the primary function of lacings in a lattice boom?

Lacings provide diagonal reinforcement to form stable triangular truss patterns, transferring shear forces between main chords and preventing buckling under compressive and bending loads.

How are lacings typically connected in lattice booms?

They are connected via bolted joints (using high-strength bolts) or welded fillet joints, following standards like AWS D1.1 for welding or ISO 898-1 for bolting.

What materials are used for manufacturing lacings?

High-strength low-alloy steel (e.g., ASTM A572 Grade 50) with corrosion protection like hot-dip galvanizing or epoxy coatings, ensuring durability under outdoor and heavy-load conditions.

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.

Lacings