Wire rope is a machine. Not just a component or tool—it’s a highly engineered machine, built to move loads with strength and flexibility. But like any machine, wire rope slings degrade over time, especially when exposed to harsh jobsite conditions. Knowing when to remove a sling from service is critical—but it isn’t always obvious. While OSHA and ASME don’t define a fixed “expiration date” for wire rope slings, they do mandate regular inspections and provide detailed criteria for safe use. In this guide, we’ll cover the types of wire rope, splicing methods, wire rope sling inspection procedures, removal guidelines, and best practices for storage and repair.
Wire rope consists of multiple strands of high-strength steel wires helically wound around a central core. There are two primary core types:
6×19 IWRC wire rope sling.
• IWRC (Independent Wire Rope Core): Steel core; higher strength and heat resistance
• Fiber Core: Made from synthetic fibers; more flexible, less heat-resistant
In industrial settings, IWRC wire rope is most common due to its durability and compatibility with heavy lifting.
Wire rope slings are fabricated by forming an eye at the end, which can be done using:
• Hand Splicing: Narrower profile for tight clearances; no metal sleeve; less capacity
• Mechanical Splicing: Uses a pressed metal sleeve; stronger, more economical, and the most widely used method in rental fleets
While hand-spliced slings offer flexibility, mechanical splices provide greater load capacity and consistency—ideal for high-demand applications.
Both OSHA and ASME B30.9 require routine inspections performed by a qualified person—often the user. The Wire Rope Sling Users Manual outlines the following best practices:
Lay the sling out fully so all parts are visible.
Clean the sling to remove dirt or grease.
Inspect the entire length, paying close attention to high-wear areas.
Focus on fittings, eyes, and terminations.
Evaluate the worst section against rejection criteria.
Tag or document the sling’s inspection status.
Maintain written inspection records.
Immediately remove slings that fail inspection from service.
At LGH, we’re implementing RFID tracking to log inspections, repairs, and user data in real-time—streamlining compliance and maintenance across our wire rope sling rental fleet.
LGH storage facility
Storage plays a major role in sling longevity. To reduce corrosion and damage:
• Keep slings off the ground and away from water, chemicals, and extreme temperatures
• Store slings on custom or standard racks, never under loads or machinery
• Reapply lubrication if stored in corrosive or outdoor environments
• Avoid temperatures above 400°F or below -40°F (for steel-cored slings)
Lubrication note: Use the same type of lubricant as applied during manufacturing to maintain consistency and internal protection.
Minimum clear length between splices or fittings depends on sling construction:
• Cable laid / 6×19 / 6×37 slings: At least 10× rope diameter
• Braided slings: At least 40× rope diameter
• Endless / grommet slings: At least 96× rope diameter
For temperature-related performance, consult the sling manufacturer when operating outside the standard range of -60°F to 400°F. Metallurgical changes may weaken the rope at high temperatures.
OSHA mandates removal of any sling that meets these failure conditions:
• 10 broken wires in one lay, or 5 in one strand within one lay
• 1/3 diameter wear on outer wires
• Kinks, birdcaging, crushing, or core deformation
• Heat damage (discoloration, burn marks, weld spatter)
• Severely corroded rope or attachments
• Hooks distorted more than 15% in throat opening or twisted 10+ degrees
ASME B30.9 adds:
• Hooks bent more than 5% from normal
• Slipped eye splices or severely damaged sleeves
• Evidence of strand unlaying or mechanical unbalance
Important: If a sling is rejected, tag it “Do Not Use” immediately and physically destroy it (e.g., cut the eye or rope body). Disposal prevents accidental reuse of compromised gear.
Wire rope slings and sheave blocks from LGH on the jobsite
Slings may only be repaired by:
• The original manufacturer
• A qualified and certified service provider
Repairs must meet original specs. Any repaired sling must be proof-tested at 200% of rated capacity and properly tagged.
Note: If the rope body itself is damaged—due to heat, corrosion, or wear—it cannot be repaired. Like a totaled vehicle, when repair costs exceed value or structural integrity is lost, the sling must be scrapped.
Inspection frequency depends on use:
• Light use / clean environments: At least annually
• Heavy or frequent use: Quarterly or monthly
• Extreme environments: Consider pre-use inspections
Maintain a written inspection log including the date, condition, and inspector’s name. This ensures traceability in the event of an incident and reduces the risk of using an unsafe sling.
Wire rope slings are robust—but they’re not invincible. Regular inspections, proper storage, and strict adherence to standards like wire rope sling ANSI specification are non-negotiable in any safe lifting operation. The cost of replacing a sling is insignificant compared to the consequences of a failed lift.
For help selecting, inspecting, or renting wire rope slings, contact your LGH representative today.
Contact LGH or call 800-878-7305 to speak with a rental expert.
Work Citations
Parnell Services Group Inc.
LGH is North America’s largest single organization devoted exclusively to the provision of lifting and moving equipment for rent. LGH holds the most comprehensive inventory for hoisting, rigging, jacking, pulling, material handling, and safety equipment. With over 90,000 pieces, discover your next project solution at RentLGH.com.
