Couplings

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REX ® THOMAS ® COUPLINGS <strong>Couplings</strong> SPECIAL FLEXIBLE DISC COUPLINGS Brake Drum Hub Motor-Tachometer Coupling Double Disc Packs Provide High Axial Capacity Hydraulic Hub Mounting Axial Limiting Stops Shrink Disc Hub Mounting Slide Coupling For Axial Positioning Clamp Hub Mounting 38
<strong>Couplings</strong> TYPE SN ADJUSTABLE REX ® THOMAS ® COUPLINGS Type SN adjustable couplings were developed as emergency replacements for standard Type SN couplings and are available from stock in most sizes required for cooling tower applications. Each shaft may be adjusted thru a four-inch length range, using a special compression bushing to lock the shaft in place once the length is set. A G B N L N General Dimensions (inch) & Engineering Data Weight WR 2 Change Change ➀ ➁ Per Inch of ➁ per inch of Axial Coupling Min. Adjustment W eight “ L” WR 2 “L” Capacity Size Max Bore A B G H “L” Range ( lb. ) ( lb. ) ( lb.-in. ) ( lb.-in. ) (in.) 162 1.88 4.47 1.88 2.75 0.54 14.25 4.00 19 0.13 37 0.22 ± 0.036 200 2.25 5.44 2.12 3.28 0.57 15.12 4.00 30 0.29 80 0.56 ± 0.036 226 2.62 5.81 2.62 3.78 0.58 17.28 4.00 43 0.33 151 0.82 ± 0.036 262 3.12 6.69 3.00 4.50 0.47 18.88 4.00 61 0.41 253 1.60 ± 0.043 ➀ All Thomas disc couplings meet NEMA frame sleeve bearing motor specifications without modification or the addition of end-float restricting devices . ➁ Weight and WR2 at maximum bore. Note: See page 27 for selection data. REX ® THOMAS ® BACKSTOP W CW - OPERATION ➁ CCW - BACKSTOP A MATE-UP ➀ BOLTING SUPPLIED WITH BACKSTOP ASSEMBLY • Bolts Directly to Thomas SN & TSN- CT Hubs • Prevents reverse shaft rotation of Cooling Tower Fans • All Stainless Steel Construction • Available from Stock • For non-Corrosive environments this can be supplied in carbon steel. MAX. BORE OD COMPRESSED PAWL DIAMETER (RUNNING) SPRUNG PAWL DIAMETER (NO OPERATION) SECTION A-A A B.C. DIAMETER Bolt-On Backstop Tabulation (inch) Mating Hub bckstop Bolting Info Pawl Dia. (Ref) Compressed Coupling Size Max Bore B.C. Dia. Capscrew Size Min Tap DP Tight Torque ( lb.-in.) O D W (Ref) Compressed Sprung Speed (RPM Ref) 162 1.88 2.312 1/4 - 20 NC × 1.50 0.62 25 200 2.12 2.688 1/4 - 20 NC × 1.50 0.62 25 5.25 1.00 5.69 6.50 450 RPM Ref 226 2.62 3.250 1/4 - 20 NC × 1.50 0.62 40 262 3.12 3.875 3/8 - 16 NC × 1.75 0.88 142 312 3.62 4.438 7/16 - 14 NX × 2.00 1.12 225 9.12 1.12 9.19 10.56 400 RPM Ref 350/375 4.00 4.875 1/2 - 13 NC × 2.00 1.12 350 Special integral hub/backstop can be supplied. ➀ 162 & 200 size supplied with (4) socket head capscrews. All other sizes supplied with (4) hex head capscrews . ➁ Backstop may be inversely mounted for opposite rotation . Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request. 39
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Couplings

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