| CRITICALITY CODE JUSTIFICATION | TEXT |
| GENERAL CHARACTERISTICS ITEM DESCRIPTION | NSN IS A CRITICAL APPLICATION ITEM (CAI) |
| MATERIAL | STEEL |
| SPECIAL FEATURES | ITEM IS PART OF THE STEAM SEAL REGULATOR ASSEMBLY ONBOARD THE SSBN-726 CLASS AND VARIOUS OTHER VESSELS |
| SPECIAL TEST FEATURES | THE SCREW MATERIAL SHALL BE AS SPECIFIED IN ASTM A108, GRADE 121, COLD DRAWN; THE CHECK NUT MATERIAL SHALL BE AS SPECIFIED IN MIL-S-1222, TYPE I, GRADE 2, STYLE B; THE FLAT HEAD RIVET MATERIAL SHALL BE AS SPECIFIED IN DOD-F-24669/1, GRADE DESIGNATION 1010; MATERIAL FURNISHED SHALL CONTAIN NO MERCURY OR MERCURY COMPOUND AND SHALL BE FREE OF MERCURY CONTAMINATION |
| SUPPLEMENTARY FEATURES | TOLERANCES SHALL BE AS FOLLOWS: FRACTIONAL TOLERANCE SHALL BE + OR - 1/64"; ANGULAR TOLERANCE SHALL BE + OR - 1 DEGREE; THE THREAD SERIES DESIGNATION FOR THE SCREW SHALL BE 1/2 - 13UNC-2A; THE THREAD SERIES DESIGNATION FOR THE CHECK NUT SHALL BE 1/2 - 13UNC - 2B |