TM 10-5411-224-14 Table 5-3.  Rivnuts Dash No. Part No. Style Dim A Dim D Dim L T Dim C Grip Range SM-C-563711-1 S25B151 C 0.529 0.332 1.000 1/4-20 UNC-3B . .089 - .151 SM-C-563711-2 S25B211 C 0.529 0.332 1.062 1/4-20 UNC-3B .151 - .211 SM-C-563711-3 S25B451 C 0.529 0.332 1.312 1/4-20 UNC-3B .391 - .451 SM-C-563711-4 S10B366 C 0.391 0.250 1.094 10-32 UNC-3B .316 - .366 SM-C-563711-5 S25B140 E 0.475 0.332 1.000 1/4-20 UNC-3B 0.058 .080 - .140 SM-C-563711-6 S8B106 C 0.355 0.221 0.687 8-32 UNC-3B .065 - .106 SM-C-563711-7 S31B350 D 0.665 0.413 1.032 5/16-18 UNC-3B 0.062 .275 - .350 SM-C-563711-8 S318125 E 0.665 0.413 1.187 5/16-18 UNC-3B 0.062 .030 - .125 SM-C-563711-9 S31B481 C 0.656 0.413 1.562 5/16-18 UNC-3B .406 - .481. SM-C-563711-10 S8B201 C 0.355 0.221 0.687 8--32 UNC-3B .161 - .201 SM-C-563711-11 S8B161 C 0.355 0.221 .0687 8-32 UNC-3B .106 - .161 SM-C-563711-12 S25B320 E 0.475 0.332 1.187 1/4-20 UNC-3B 0.058 .260 - .320 SM-C-563711-13 S318425 E 0.665 0.413 1.531 5/16-UNC-3B 0.062 .350- .425 SM-C-563711-14 S31B350 E 0.665 0.413 1.437 5/16-18 UNC-3B 0.062 .275-.350 WARNING Drilling creates metal chips which may enter eyes and cause serious injury.  Eye protection is required. CAUTION Make sure drill bit has a stop attached which will prohibit the drill from exceeding a depth of one inch. NOTE Drill hole size must match size of rivnut being installed.  Quantities of sheets may be drilled at the same time when held together with sheet fasteners. (b) Drill hole in structure. (c) Remove all metal chips and remove burrs from drilled holes. (d) If a countersunk rivnut is being installed, countersink hole using a 100- degree machine countersink. (e) Thread stem of appropriate pull-up stud into rivnut.  Stud should protrude through open end rivnuts or be 1-1/2 threads from bottoming in closed end rivnuts. 5-11