37-Pin Female D-Sub to 37-Pin Female Screw Terminal, PXI Module Mount Terminal Block—The TB-2621 provides an industrial PXI front-mounting terminal block for 37-pin D-SUB modules such as the PXI-6521 PXI Digital I/O Module. It features a 150 V CAT II rating, 2 A max current, screw-terminal connectivity, and a strain-relief bar.