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Home Page 1–15 Hardened Spur Gears - 24, 32 & 48 Pitch S705ZY-D0832H05 S705ZY-D0832H04 S705ZY-D0832H03 Bore Set Screw Catalog Number Set Screw Length 1/4 3/8 1/2 5/16 1/4 3/16 See index for other sizes of available half dog set screws. AGMA 10 20° PRESSURE ANGLE Fig. 1 HALF DOG SET SCREW MOUNTING (Medium Torque – All Bores) Fig. 2 SPIROL PIN MOUNTING (Medium and High Torque for 1/2" Bores) 1/8 DRILL LOCTITE 242 OR EQUIVALENT S7220Y-13112 SPIROL PIN APPROPRIATE DEPTH PREDRILL FINAL ASSEMBLY #35 DRILL .115DIA. .109 .05 MIN. LOCTITE 242 OR EQUIVALENT SEE ABOVE FOR PART NUMBER PREDRILL FINAL ASSEMBLY Sterling Hardened Spur Gears (AGMA 10) are made of tough alloy steel heat-treated by a proprietary diffusion coating process, which gives high surface hardness and very good corrosion resistance. The core hardness is RC38. The surface hardness is RC55 or higher. The finish is black due to the final heat treatment and it may be omitted from the bore.  The combination of good quality, tough core and high surface hardness, make these gears a very attractive alternative to the much more expensive hardened and ground gears. The corrosion resistant surface combined with appropriate lube make them work in any harsh environment, under extremely heavy loads. The gears have two tapped #8-32 UNC holes located at 90°.  Two cup point 18-8 stainless steel set screws are supplied with the gears.  The suggested mounting configurations for higher torque are given in figures 1 and 2. For half dog set screw mounting (Fig. 1) the following set screws can be used: .130 .124DIA.