Part Number Metric Threads British Threads
1604 4
1606 6
1608 8
1610 10 1/8-28
1612 12
1613 13 1/4-19
1614 14
1616 16
1617 17 3/8-19
1618 18
1620 20
1621 21 1/2-14
1622 22
1624 24
1626 26
1627 27 3/4-14
1630 30
1633 33 1-11
1636 36
1639 39
1642 42 1 1/4-11
1645 45
1648 48 1 1/2-11
1652 52
1660 60 2-11