From inside (document excerpt):
OPERATOR’S MANUAL 47 ” Two-Stage Commercial Snowthrower Mfg. No. 1692243 Hitch Mfg. No. 1692244 STANDARD FASTENER IDENTIFICATION CHART HEX CAPSCREW Hardware sizes given in the illustrations throughout this manual. If a washer or nut is identified as “washer, i/2 ” or “nut, i/2 “, this means the inside diameter is l/2 inch If a screw is identified as “screw, i/2 x 2 “. this means the shaft diameter is l/2 inch and the shaft of the screw is 2 inches long. If a screw is identified as “screw, i/2 – 16 x 2 “, the number “16 ” means that the screw has 16 threads per inch.
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SAMPLE: HEX CAPSCREW IDENTlFlCATlON SCREW IDENTIFICATION CARRIAGE BOLT 0 @ @ LOCKWASHER @ NUT PLAIN WASHER Shown below are actual size heads for standard screw sizes. Example: a l/4 screw has 7/16 head and thus requires a 7/16 wrench. To measure length, use the scale below. 00000 3lV Head screw with l/2 ” SD. 5/s ” Head screw with 7ll6’S.D. 9/16 ” Head screw with 318 ” SD. l/2 ” Head screw with 5/16 ” SD. 7/l 6 ” Head screw with 114 ” S.D. SAMPLE: NUT IDENTIFICATION WASHER AND NUT IDENTIFICATION Place the washer or nut on the above scale to determine the inside diameter. The actual inside diameter can vary 1116 inch. Use the scale for comparison. Nut, l/2 Inside Diameter TORQUE SPECIFICATIONS FOR STANDARD MACHINE HARDWARE SEE SAE GRADE #2 0 SAE GRADE #S Q SAE GRADE 88 Q In.1Lb.s. Nm. FtJLbs. 41 43 80 68 .
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