Hexagonal bolt with thread up to the head ASME B18.2.1, trivalent blue passivated zinc plated GR8 steel, UNC (comparable with ISO metric thread)
ASME B18.2.1 steel GR8 zinc plated trivalent UNC
SCR-HCS-FT-GR8-(ZT)-1/4_20X1 1/2
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The thread length differs from standard ASME B18.2.1 thread to head
1 INCH (in) = 25.4 mm
FT = full thread
Mechanical properties are regulated in SAE J429.
Standard thread tolerance according to ASME B1.1 = 2A (for male thread)
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