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A
is the Thread Size. i.e. M5 is a Metric 5mm. B is the Length of where the Screw is measured. Cup Square Carriage Bolts are used many in applications i.e.: bolting large hinges on wood doors, holding roof panels down, it is ideal for wood as the square shoulder stops it from turning as you tighten the nut, & the large head dose not need a washer. Some may have only 30-40mm of thread |
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