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Manufacturing Process
Shapes of bolt and screw head
Screw Point Types
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Finish & Coating
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Metric Coarse & Fine
Spark Plug
Unified National Coarse (UNC) & Unified National Fine (UNF)
British Standards (BSW, BSF, BSP, BA, BSC)
National Pipe Taper (NPT)
8-UN Constant Pitch
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