Photo:

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Description:

These washers have a polymer that squirts out when direct tension reaches a predetermined level. Checking the tension of bolts becomes a simple visual inspection.

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Categories:

Mistake-proofing category: Mistake detection
Setting function: Physical, or information enhancement
Regulatory function: Sensory Alert
Source: Off-the-shelf

Sources of Supply: http://www.appliedbolting.com/index.php