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#4 - 40 UNC Countersunk Headed Hexagon Socket Screws, Allen Bolts UNC Thread Stainless Steel Grade A2, British Standard BS1768:1963
CSK screws length measured overall including head
Size / Thread Total Length #4 - 40 UNC x 1/4 Inch #4 - 40 UNC x 1/2 Inch #4 - 40 UNC x 3/4 Inch #4 - 40 UNC x 1 Inch
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