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Carriage bolts (also descriptively called round head square neck bolts) generally feature a broad, shallow round head and threading along part of the carriage bolt shank, and is inserted into pre-drilled holes. The square under the head keeps the carriage bolt from turning as the nut is tightened.

Carriage bolts are commonly used in wood and are used to fasten wood parts, or wood and metal parts, together. Carriage bolts are also successful with sheet metal applications, where a standard sized neck may create an obstruction.
A307 GRADE A CARRIAGE BOLT, HDG (INCH)
Unit of Measure
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50C1200BCG2G/600T N/A 1/2-13 X 12 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 50 QUOTE
25C62BCG2G N/A 1/4-20 X 5/8 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 3500 QUOTE
25C175BCG2G N/A 1/4-20 X 1 3/4 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 1500 QUOTE
25C250BCG2G N/A 1/4-20 X 2 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 1000 QUOTE
31C350BCG2G N/A 5/16-18 X 3 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 500 QUOTE
31C500BCG2G N/A 5/16-18 X 5 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 300 QUOTE
37C150BCG2G N/A 3/8-16 X 1 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 825 QUOTE
37C200BCG2G N/A 3/8-16 X 2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 550 QUOTE
50C650BCG2G/600T N/A 1/2-13 X 6 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 100 QUOTE
62C650BCG2G/600T N/A 5/8-11 X 6 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 45 QUOTE
75C400BCG2G N/A 3/4-10 X 4 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 45 QUOTE
75C500BCG2G N/A 3/4-10 X 5 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 45 QUOTE
50C950BCG2G/600T N/A 1/2-13 X 9 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 90 QUOTE
75C250BCG2G N/A 3/4-10 X 2 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 100 QUOTE
37C1100BCG2G/600T N/A 3/8-16 X 11 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 50 QUOTE
50C1200BCG2G/600T N/A 1/2-13 X 12 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 25 QUOTE
25C62BCG2G N/A 1/4-20 X 5/8 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 250 QUOTE
25C100BCG2G N/A 1/4-20 X 1 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 125 QUOTE
25C225BCG2G N/A 1/4-20 X 2 1/4 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 100 QUOTE
31C350BCG2G N/A 5/16-18 X 3 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 50 QUOTE
31C450BCG2G N/A 5/16-18 X 4 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 25 QUOTE
37C150BCG2G N/A 3/8-16 X 1 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 75 QUOTE
37C500BCG2G N/A 3/8-16 X 5 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 25 QUOTE
50C125BCG2G N/A 1/2-13 X 1 1/4 CARRIAGE BOLT A307 GRADE A GALVANIZED N/A 50 QUOTE
62C650BCG2G/600T N/A 5/8-11 X 6 1/2 CARRIAGE BOLT A307 GRADE A GALVANIZED (WITH 6 INCH THREAD) N/A 5 QUOTE
Unit of Measure
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