CARRIAGE BOLTS
GRADE 2 CARRIAGE BOLTS TYPICALLY COME
WITH A FULL THREAD UP TO 6" LENGTH
CARRIAGE BOLTS LONGER THAN 6"
WILL TYPICALLY HAVE A 6" THREAD LENGTH
YEARS AGO WHEN CARRIAGE TYPE BOLTS WERE
PRIMARILY PRODUCED IN THE UNITED STATES THEY WERE PRIMARILY MADE WITH
THE SAME THREAD LENGTH FORMULA AS HEX BOLTS, TWICE THE DIAMETER PLUS
A 1/4" INCH TO DETERMINE THREAD LENGTH. AS THE BOLTS BECAME MORE
OF AN IMPORT PRODUCT AND DUE TO THE DEMAND FOR MORE THREAD LENGTH DUE
TO VARYING APPLICATIONS THEY BECAME FULLY THREADED FOR THE MOST PART
UP TO 6" LENGTHS. CURRENT GRADE 5 CARRIAGE ALSO FOR THE MOST
PART COME WITH THE ADDED THREAD LENGTH AS WELL, BUT NOT ALWAYS.
A SHAKER SCREEN BOLT ORIGINALLY WAS A
BOLT WITH CARRIAGE BOLT DIMENSIONS BUT WAS ALWAYS A FULL THREAD BOLT
IN GRADE 5 AND IN 1/2" THRU 3/4" DIAMETER AVAILABLE. TODAY
THERE ARE GRADES 5 - 8 AND 9 ON THE COMMERCIAL MARKET. WE STILL
CLASSIFY THESE DIAMETERS - FULLY THREADED IN ALL LENGTHS AS A "SHAKER
SCREEN BOLT". 8 AND 9 FOR AVAILABILITY.
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SQUARE NECK
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FINNED NECK
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RIBBED NECK
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COUNTER SUNK
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BOLT DIAMETER
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HEAD DIAMETER
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HEAD HEIGHT
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RIB O.D.
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HEAD DIAMER
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3/16
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0.469
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0.114
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0.210
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0.500
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1/4
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0.594
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0.145
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0.274
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0.625
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5/16
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0.719
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0.176
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0.340
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0.750
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3/8
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0.844
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0.208
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0.405
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0.875
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7/16
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0.969
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0.239
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0.470
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1.000
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1/2
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1.094
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0.270
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0.534
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1.125
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5/8
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1.344
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0.344
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0.660
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1.375
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3/4
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1.594
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0.406
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0.785
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1.625
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7/8
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1.844
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0.459
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1”
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2.094
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0.531
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