TM 1-1520-240-BD Table 2-2.  Information on Bolts and Screws HOLE SIZE HOLES SIZE STANDARD SIZE FIT I HOLE SIZE HOLE SIZE FIT IV MINIMUM PART AND LOOSE FIT II FIT III REAM MINIMUM EDGE DESCRIPTION NUMBER DIAMETER DRILL CLOSE DRILL REAM (SPECIAL) SPACING DISTANCE* Washer AN525-10 10-32 0.190 0.201 -0.000 0.191 -0.000 0.190 -0.0005 - 11/16 3/8 Head +0.006 +0.006 +0.0005 Screws AN525-416 114-28 0.250 0.261 -0.000 0.250 -0.000 0.250 -0.0005 - 3/4 1/2 +0.007 +0.007 +0.0005 Countersunk NAS213 10-32 0.189 0.2031 -0.002 0.191 -0.02 - - 11/6 3/8 Head +0.004 +0.006 Screws NAS-214 1/4-28 0.249 0.2656 -0.002 0.250 -0.000 - - 3/4 1/2 +0.005 +0.007 NAS8215 516-24 0.3115 0.3281 -0.002 0.3175 -0.000 - - - - +0.005 +0.007 NAS216 3/824 0.3740 0.3906 -0.002 0.375 -0.000 - - - - +0.005 +0.007 Hex AN3 10-32 0.189 0.201 -.000 0.191 -0.000 0.190 -0.005 - 11/16 3/8 Head +0.006 +0.006 +0.0005 Bolts AN4 114-28 0.249 0.261 -0.000 0.250 -0.000 0.250 -0.0005 - 3/4 1/2 +0.007 +0.007 +0.0005 AN5 5116-24 0.312 0.323 -0.000 0.3125 -0.000 0.3125 -0.0005 - - - +0.007 +0.007 +0.0005 AN6 3/124 0.374 0.386 -0.000 0.375 -0.000 0.375 -0.0005 - - - +0.007 +0.007 +0.0005 AN7 7/16-20 0.437 0.4531 -0.000 0.4375 -0.000 0.4375 -0.0005 - - - +0.000 +0.007 +0.0005 AN8 112-20 0.449 0.5156 -0.000 0.500 -0.000 0.500 -0.005 - - - +0.008 +0.008 +0.0005 AN9 9/16-18 0.562 0.5781 -0.000 0.5625 -0.000 0.5625 -0.0005 - - - +0.006 +0.008 +0.0005 AN10 56-18 0.624 0.6406 -0.000 0.625 -0.000 0.625 -0.0005 - - - +0.008 +0.008 +0.0005 AN12 3W4-16 0.749 0.7656 -0.000 0.750 -0.000 0.750 -0.0005 - - - +0.010 +0.010 +0.0005 Clevis AN23 10-32 0.186 0.199 -0.000 0.189 -0.000 0.1875 -0.0010 0.1865 -0.0000 11/16 3/8 Head +0.006 +0.006 +0.0005 +0.0005 Bolts AN24 114-28 0.248 0.257 -0.000 0.250 -0.000 0.250 -0.0015 0.2485 -0.0000 3/4 1/2 +0.007 +0.007 +.0.0005 +0.0005 AN25 5116-24 0.311 0.323 -0.000 0.3125 -0.000 0.3125 -0.0010 0.3115 -0.0000 - - +0.007 +0.007 +0.0005 +0.0005 AN26 38B 0.373 0.386 -0.000 0.375 -0.000 0.375 -0.0015 0.3735 -0.0000 - - +0.007 +0.007 +0.0005 +0.0005 *Minimum edge distance applies only to sheet construction. FIT I Used to attach brackets and accessories, or where several bob attach sheet or plate material. FIT II Used In primary structure where several bolts are used in a rigid joint. FIT III Used where one or two bolts are subject to reversible loads, vibration, or both. FIT IV Used where minimum clearance is to be maintained and units subjected to shear loads. 2-46