Crosby Connecting Links

About Crosby Connecting Links

The Crosby A-339 connecting link is a mechanically-closed, grade-rated link designed to join two chain ends in a load-bearing assembly. The link body opens for chain installation and closes mechanically, the locking mechanism secures the link body closed before the assembly goes into service.

Grade matching is the core requirement for connecting links in chain sling assemblies. An A-339 Grade 80 connecting link installed in a Grade 80 chain assembly maintains the assembly's rated WLL at the connection point. A lower-grade connecting link creates a reduction in WLL at that point regardless of what the chain itself is rated.

Crosby A-339 connecting links carry grade markings and WLL per ASME B30.9-2018 (Slings) and NACM Welded Chain Specifications. The marking system lets assembly documentation show consistent grade ratings through every component.

Holloway Houston stocks Crosby A-339 connecting links in Houston with same-day shipping on standard chain sizes.

Types of Crosby Connecting Links

A-339 Connecting Links (Grade 80)

The Crosby A-339 is the standard Grade 80 connecting link for alloy chain sling assemblies. Mechanically closed, marked with WLL and grade per ASME B30.9-2018 (Slings) and NACM standards. Available in chain sizes from 7/32" through 1" wire diameter.

S-339 Connecting Links (Grade 100)

The S-339 is the higher-grade connecting link for Grade 100 chain assemblies. Same mechanically-closed design as the A-339, rated to match Grade 100 chain capacity. Where Grade 100 chain is specified for its higher capacity-per-weight, the S-339 connecting link maintains that rating at the connection point.

Crosby Connecting Link Sizes and Working Load Limits

Crosby A-339 connecting links are sized to match standard alloy chain sizes from 7/32" through 1" link wire diameter. WLL at each chain size matches the corresponding Grade 80 chain WLL.

Grade Rating :

• A-339: Grade 80 alloy steel.
• S-339: Grade 100 alloy steel.

Marking:

• Grade designation, WLL, and manufacturer identification per ASME B30.9-2018 (Slings) and NACM

Why Crosby for Connecting Links

The A-339's combination of mechanically-closed design, Grade 80 rating, and ASME B30.9-2018 (Slings) compliance makes it the standard specification for connecting links in documented chain sling assemblies. The mechanical closure is the design feature that distinguishes it from open-design links that rely on field-applied wire or tape to stay closed, a feature that's not appropriate for rated rigging service.

Crosby's lot traceability on the A-339 means the connecting link can be documented alongside the chain in an equipment register or third-party inspection report.

Holloway Houston also offers rigging inspection services. Our qualified inspectors examine chain slings, connecting links, and rigging hardware per ASME B30.9-2018 (Slings) and OSHA standards.

Shop Crosby Connecting Links by Type

• Crosby A-339 Connecting Links (Grade 80).
• Crosby S-339 Connecting Links (Grade 100).

Crosby Connecting Link Applications

• Chain Sling Assembly and Repair — Joining chain sections, extending sling leg length, and replacing damaged links in Grade 80 and Grade 100 chain sling assemblies.
• Industrial Rigging — Alloy chain sling assemblies in steel mill, foundry, mining, and offshore applications where chain's temperature and abrasion performance is the reason it's specified.
• Chain Hoist Service — Joining load chain sections in chain hoist assemblies where the connecting link becomes part of the rated load chain.

Why Holloway Houston for Crosby Connecting Links

Holloway Houston is an authorized Crosby distributor with over 65 years in rigging and lifting, operating from Houston, Texas. We stock Crosby connecting links alongside Grade 80 chain, coupling links, and chain sling accessories.

Our rigging specialists can match connecting link size and grade to your chain assembly. We also offer rigging inspection services.

Related Chain Sling Hardware

• Crosby Coupling Links — Coupling links for connecting chain ends to hardware fittings.
• Crosby Chain Accessories — Grab hooks, shortening clutches, and chain fittings for complete sling assemblies.
• Crosby Chains — Grade 80 alloy chain for chain sling fabrication and repair.

Connecting Link Safety and Awareness

Connecting links fall under ASME B30.9-2018 (Slings) and NACM Welded Chain Specifications. OSHA 1910.184 and OSHA 1926.251 reference chain sling hardware inspection requirements.

Key awareness points:

• Connecting links are fully closed and mechanically locked before the assembly returns to service. A connecting link that is not fully closed is not at rated capacity.
• The connecting link grade matches the chain grade in the assembly. Mixing grades limits the assembly WLL to the lower-rated component.
• Pre-use inspection covers the link body for cracks and deformation, the locking mechanism for full engagement, and the bearing surfaces for wear at contact points with chain links.