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    System of Measurement
    System of Measurement
    Inch
    For Screw Size
    For Screw Size
    1/4"
    5/16"
    3/8"
    1/2"
    Washer Type
    Washer Type
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    Square-Neck Bolt Lock
    Inside Width
    Inside Width
    0.270"
    0.345"
    0.405"
    0.535"
    Material
    Material
    Steel
    Finish
    Finish
    Zinc Plated
    DFARS (Defense Acquisition Regulations Supplement)
    DFARS (Defense Acquisition
    Regulations Supplement)
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    Hardness
    Hardness
    Rockwell B47
    REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)
    REACH (Registration,
    Evaluation, Authorization
    and Restriction of Chemicals)
    REACH Compliant
    RoHS (Restriction of Hazardous Substances)
    RoHS (Restriction of
    Hazardous Substances)
    RoHS Compliant
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    4 Products