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Item #

Size

Hexagon Size (Across Flats)

Hexagon Size (Thickness)

Material

MS 51971-1 N/A 1/4-20 N/A 7/16 in N/A 7/32 in N/A Corrosion Resistance Steel
MS 51971-2 N/A 5/16-18 N/A 1/2 in N/A 17/64 in N/A Corrosion Resistance Steel
MS 51971-3 N/A 3/8-16 N/A 9/16 in N/A 21/64 in N/A Corrosion Resistance Steel
MS 51971-4 N/A 7/16-14 N/A 11/16 in N/A 3/8 in N/A Corrosion Resistance Steel
MS 51971-5 N/A 1/2-13 N/A 3/4 in N/A 7/16 in N/A Corrosion Resistance Steel
MS 51971-6 N/A 9/16-12 N/A 7/8 in N/A 31/64 in N/A Corrosion Resistance Steel
MS 51971-7 N/A 5/8-18 N/A 15/16 in N/A 35/64 in N/A Corrosion Resistance Steel
MS 51971-8 N/A 3/4-10 N/A 1-1/8 in N/A 41/64 in N/A Corrosion Resistance Steel
MS 51971-9 N/A 7/8-9 N/A 1-5/16 in N/A 3/4 in N/A Corrosion Resistance Steel
MS 51971-10 N/A 1-8 N/A 1-1/2 in N/A 55/64 in N/A Corrosion Resistance Steel
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