Barrel Nut for 3/8 in. Rail Bolts click image for larger view $6.95 each Product #: BN-1/14tpi Threads per Inch 14 TPI 16 TPI Add Barrel nut (to be inserted into slate) for rail bolt with 14 threads per inch (works with Round Headed Rail Bolt). Also available in 16 threads per inch. click image for larger view Barrel Nut for 3/8 in. Rail Bolts- 14 TPI BN-1/14tpi $6.95 each Add click image for larger view Barrel Nut for 3/8 in. Rail Bolts- 16 TPI BN-1/16tpi $6.95 each Add You may also be interested in… Round Head Rail Bolt $15.95 each Results 1 - 1 of 1