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| Catalog provided courtesy of The Crosby Group, Inc. | |
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Hoist Hooks - 319, 320, 322, 316 |  |
| Page 082 | ||
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What
It Takes To Be “Crosby Or Equal” |
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| DESIGN | COMPETITION | CROSBY |
| The theoretical reserve capability of a hoist
hook should be a minimum of 5 to 1 for carbon eye hooks, alloy eye hooks
and carbon shank hooks and 4.5 to 1 for alloy shank hooks. Known as the
DESIGN FACTOR, it is usually computed by dividing the catalog ultimate
load by the working load limit. The ultimate load is the average load
or force at which the product fails or no longer supports the load. The
working load limit is the maximum mass or force which the product is authorized
to support in general service. The design factor is generally expressed
as a ratio such as 5 to 1. Also important to the design of hooks is the selection of proper steel. |
Ask:
What is the design factor? Ask: Is each production lot performance tested? |
Crosby
hoist hooks meet the design factor requirements of 5 to 1 for all carbon
hooks, 5 to 1 for all alloy eye and swivel hooks and 4.5 to 1 for alloy
shank hooks. Crosby’s QC1400 program determines the mechanical properties
of each manufacturing lot of hoist hooks. In addition to the heat treat process, Crosby hooks are designed with a cross section that, when overloaded, allows uniform deformation and straightening before ultimate failure. |
| QUENCHED
AND TEMPERED Quenching and tempering assures the uniformity of performance and maximizes the properties of the steel. This means that each hook meets its rated strength and other properties. This quenching and tempering process develops a tough material that reduces the risk of a brittle, catastrophic failure, thus improving impact and fatigue properties. As a result, if overloaded, the hook will deform before ultimate failure occurs, thus giving warning. The requirements of your job demand this reliability and consistency. Quench and Tempering insures that not only is the working load limit met, but that ductility, fatigue and impact properties are appropriate. |
Ask:
Are their hooks quenched
and tempered? Ask: If overloaded, do their hooks deform, giving warning before ultimate failure? Some competitors normalize the hooks, and as a result, desired properties are not achieved. A few even provide hooks in an “as forged” condition, which can result in brittle failure. |
Crosby
hoist hooks are quenched and tempered. This heat treatment process assures
a hook that will deform prior to ultimate failure. Impact and fatigue
properties are superior with quenched and tempered hooks. Crosby’s
Quenched and Tempered carbon and alloy hoist hooks are recommended for
all critical applications, including overhead lifting.
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| FULL
LINE AND IDENTIFICATION The proper application of hoist hooks requires that the correct type, size, and working load capacity of hook be used. All hooks must be load rated (with either the working load or a cross reference code). In addition the traceability code, size, and manufacturer’s name should be boldly marked on the product. Availability of a full line of eye, shank, and swivel hooks in carbon and alloy steel is essential when selecting the desired hook for the proper application. |
Ask:
Do they have a traceability
system? Ask: Does their traceability system tie into a comprehensive material testing program? Ask: Does their product offering cover the full range? Most competitors do not have the full line of hooks that Crosby produces. Most do not have a traceability system. |
Crosby
forges “Crosby” or “CG,” the Product Identification
Code (P.I.C.), and working load limit (or working load cross reference
code) into its full line. Crosby’s traceability system and P.I.C.
are an integral part of the QC1400 program
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| APPLICATION
INFORMATION Detailed application information will assist you in the proper selection and use of hoist hooks. This information is most effective when provided in supporting brochures and engineering information. A formal application and warning system that attracts the attention of the user, clearly informs the user of the factors involved in the task, and informs the user of the proper application procedures is needed. |
Ask:
Do they provide hook application
and warning information attached directly to the hook? Ask: What training support is provided? Most competitors do not have a comparable product warnings system and application information for hoist hooks. |
The Crosby Product Warnings System provides detailed application and warning information for hoist hooks. In addition, a video on hook maintenance is also available. Field inspection criteria and repair instructions are also available. Training seminars conducted by Crosby provide training on the proper use of hoist hooks. Crosby training packets, supplied free to attendees of Crosby’s seminars, provide training materials needed to explain the proper use of hoist hooks. |
Remember, "When buying Crosby, you're buying more than product, you're buying Quality." |
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