Explore our extensive range of chain grades, each meticulously designed to meet specific industry needs. From Grade 30 Proof Coil Chain, ideal for general purposes, to Grade 100 Alloy Chain, offering superior strength, our selection covers a wide spectrum of applications. Discover the right grade for your lifting and rigging requirements, backed by our commitment to safety and quality.
Is a general purpose chain of standard commercial quality. Made from low carbon steel, this chain is frequently used for fabricating tow chains, logging chains and, when appropriate, tie down or binding chains. The manufacturer’s symbol and grade marking of 3, 30, or 300 is placed on the chain links every foot or so. Grade 30 Proof Coil Chain is not to be used for overhead lifting.
Is a higher strength chain used for years in the trucking industry for tie downs that meet DOT specifications. Made from a higher carbon steel, its strength surpasses proof coil working load limits, size for size, by a factor of 2 to 1. The manufacturer’s symbol and grade marking of 4, 40, 43, or 400 is placed on the chain links every foot or so. Grade 40 High Test Chain is not to be used for overhead lifting.
Is used primarily to tie down loads on over-the-road equipment. Made from heat-treated carbon steel it has about 25% more strength than high test chains. The manufacturer’s symbol and grade marking: 7, 70, or 700 is placed on the chain links every foot or so. Grade 70 High Test Chain is not to be used for overhead lifting.
Is designed to stretch a minimum of 15% before it breaks, alloy chain is the only grade of chain approved by OSHA and other agencies for overhead lifting. Its alloy, heat-treated steel makes it ideal for making lifting slings and heavy duty tow chains. The manufacturer’s symbol and grade marking: 8, 80, or 800 is placed on the chain links every foot or so. Grade 80 Alloy Chain is suitable for overhead lifting.
The most recent alloy chain, provides about 25% higher working load limits than Grade 80 alloy chain with some limitations reported in lower ambient temperatures and availability of fittings. The manufacturer’s symbol and grade marking: 10 or 100 is placed on the chain links every foot or so. Grade 100 Alloy Chain is suitable for overhead lifting.
Follow these simple steps in making a sling assembly:
Each sling shall be marked to show: name or trademark of manufacturer, grade, nominal chain size, number of legs, rated load for the type(s) of hitch(es) used and angle upon which it is based (reach).
If measurement comes in the link, cut the following link. For two leg type slings, count the links and use an even number for clevis hooks and an odd number for eye hooks. This will position hooks in the same plane. In multileg slings always use the same number of links in each leg.
When using chain slings in choker applications, the Working Load Limit must be reduced by 20%. Crosby recommends a minimum angle of choke of 120 degrees. Consult Crosby when planning to use an angle of choke of less than 120 degrees. If Crosby A-1338 cradle grab hooks are used at a minimum angle of choke of 120 degrees, the full sling rated WLL can be utilized.
In shortening applications, a 20% reduction of the Working Load Limit is required except when using the Crosby A-1338 cradle grab hooks or S-1311N chain shortener link. They can be used without any reduction to the Working Load Limit.
The Slings shown here are standard assemblies that can be made from “Proof Tested” Crosby Components and Alloy Chain supplied by your authorized Crosby distributor. Assemblies must include chain sling identification tag.
CO
SOS
SOG
SOF
SSS
Single Chain Sling with Master Link each end
Single Chain Sling with Master Link and Sling Hook
Single Chain Sling with Master Link and Grab Hook
Single Chain Sling with Master Link and Foundry Hook
Single Chain Sling with Sling Hook each end
SGS
ASOS
ASOF
ASOG
SOCH
Single Chain Sling with Grab Hook and Sling Hook
Adjustable Single Chain with Master Link and Sling Hook
Adjustable Single Chain Sling with Master Link and Foundry Hook
Adjustable Single Chain Sling with Master Link and Grab Hook
Single with 1355 Choker
DOS
DOG
DOF
Double Chain Sling with Master Link and Sling Hook
Double Chain Sling with Master Link and Grab Hook
Double Chain Sling with Master Link and Foundry Hook
ADOS
ADOG
DOCH
Adjustable Double Chain Sling with Master Link and Sling Hook
Adjustable Double Chain Sling with Master Link and Grab Hook
Double with 1355 Choker
TOS
TOG
TOF
TOCH
Triple Chain Sling with Master Link and Sling Hook
Triple Chain Sling with Master Link and Grab Hook
Triple Chain Sling with Master Link and Foundry Hook
Triple with 1355 Choker
QOS
QOG
QOF
Quadruple Chain Sling with Master Link and Sling Hook
Quadruple Chain Sling with Master Link and Grab Hook
Quadruple Chain Sling with Master Link and Foundry Hook
These warnings and instructions are applicable to alloy chain slings produced from Crosby Grade 8 (80) and Grade 10 (100) chain and components.
A sling shall be removed from service if any of the following are visible on chain or attachments:
General Usage
It must be recognized that certain factors in the usage of chain and attachments can be abusive and lessen the load that the chain or attachments can withstand.
Some examples are twisting of the chain; disfigurement; deterioration by straining, usage, weathering and corrosion; rapid application of load or jerking; applying excessive loads; sharp corner cutting, D/d, action and non-symmetrical loading effects.
Environmental Effects
Excessive high or low temperatures or exposure to chemically active environments such as acid or corrosive liquids or fumes can reduce the performance of the chain and components.
Special Surface Coating / Plating / Galvanizing
Chain should not be subjected to galvanizing, or any plating process. If it is suspected the chain has been exposed to chemically active environment, remove from service.
Frequent Inspection
Periodic Inspection
Guidelines for the interval are:
Removal Criteria
An alloy sling chain shall be removed from service if conditions such as the following are present:
Repair