General Information 1) Shafts with existing keyways:
4) Bending moments: POWER-LOCK is not designed to transmit bending moments. However, POWER-LOCK will tolerate limited bending moments as shown in table listed below. M Mo. • n 2 M: Bending moment working on POWER-LOCK (in./lbs.)
Transmissible torque and thrust capacities of the POWER- LOCK ® must be decreased by 10% when used with a shaft with a keyway such as a motor shaft.
Transmissible torque: Mt • 0.9 Transmissible thrust: Pax • 0.9 2) Surface pressure (P) and (P ’ ):
Mo: Allowable bending moment (in./lbs.) n: Number of POWER-LOCK (N 4)
Should bending moment values be close to the allowable bending moments values listed in the table, use (Pt M ) instead of hub surface pressure (P) when calculating hub outside dia. (D N ).
Contact pressure values of shaft (P) and hub bore (P ’ ) listed on pages D-21, D-24 and D-25 indicate mean values only. These rated surface pressures will fluctuate from –20% to +40% due to the variable friction component forces resulting from the locking bolts. Transmissible torque (Mt) and thrust (Pax) are calculated as minimum values, provided that POWER-LOCK is to be used under the listed surface pressures, (P) and (P ’ ). Transmissible torque (Mt) and thrust (Pax) may increase by approximately 70% above the listed ratings in actual applications. 3) Radial load applications: Should POWER-LOCK be subjected to heavy radial loads (Pr) in such applications as wheel drives, calculate surface pressure (Prad) on the shaft and (P ’ rad) on the hub as follows: POWER-LOCK may be used if the surface pressure on the shaft (Prad) and the surface pressure on the hub (P ’ rad) are equal to or less than one half of (P) and (P ’ ). 1.3 • Pr 1 Prad = –––––– – P d • 2 Pr: Radial load (N) (lbs.) : POWER-LOCK inside width (in.) d: Shaft dia. (in.) D: Hub bore inside dia. (in.) P: Surface pressure on shaft (psi) P ’ : Surface pressure on hub (psi) When radial load is applied to POWER-LOCK, the above values of (Prad) and (P ’ rad) should be added to (P) and (P ’ ) respectively in order to calculate the hub outside dia. (D N ) or hollow shaft inside dia. (d B ). 1.3 • Pr 1 P ’ rad = –––––– – P ’ D • 2
5) Allowable value of tightening torque (M A ): Transmissible torque (Mt) and thrust (Pax) values are based on the correct tightening torque of the locking bolts. Acceptable range of the tightening torque is 5% of the listed value. Use an accurate torque wrench to tighten it. 6) Loosening of locking bolts: Manufactured of special high-tensile steel, the locking bolts will not loosen due to vibration. 7) Influence of temperature: The use of POWER-LOCK at temperatures above 400°F (200°C) is not suggested, since the tensile strength of the locking bolts may decrease substantially. 8) Outdoor use: When a standard POWER-LOCK is to be used outdoors, it should be lubricated with grease and a cover should be installed to protect against corrosion. If this is not practical, stainless steel POWER-LOCK (see page D-24) and special coating POWER-LOCK are available.
Allowable
Max. Surface
Allowable
Max. Surface
Allowable
Max. Surface
Allowable
Max. Surface
Model Number
Bending Moment Pressure on Hub
Model Number
Bending Moment Pressure on Hub
Model Number
Bending Moment Pressure on Hub
Model Number
Bending Moment Pressure on Hub
Mo (ft./lbs.)
Pt M (psi) 16,640 17,630 19,050 18,210 19,340 21,330 21,610 22,180 24,030 23,040 23,040 23,040 23,040 23,040 24,600 24,600 24,600 24,600 23,640 25,310 25,310 25,030 25,450 25,450 25,450 25,030
Mo (ft./lbs.)
Pt M (psi) 25,030 25,170 25,880 25,880 25,880 25,740 25,600 25,310 26,310 26,160 26,020 26,020 27,020 27,590 27,160 27,440 26,450 27,300 26,880 27,300 28,160 27,870 29,150 28,580 28,440 28,440
Mo (ft./lbs.)
Pt M (psi) 16,690 16,690 17,700 18,430 19,010 18,720 19,880 21,470 21,470 22,200 22,200 22,930 22,930 23,220 23,220 24,670 24,810 25,250 24,960 25,100 25,100 25,830 25,830
Mo (ft./lbs.)
Pt M (psi) 26,410 25,540 25,540 26,260 26,120 26,410 29,280 27,570 25,970 29,420 27,130 27,280 27,280 28,000 29,020 28,000 28,580
PL019X047 PL020X047 PL022X047 PL024X050 PL025X050 PL028X055 PL030X055 PL032X060 PL035X060 PL038X065 PL040X065 PL042X075 PL045X075 PL048X080 PL050X080 PL055X085 PL060X090 PL065X095 PL070X110
151.3 151.3 187.5 144.6 166.1 231.0 274.5 281.9 281.9 332.1 332.1 426.6 426.6 563.8 563.8 506.3 643.5 687.1 915.1
PL095X135 PL100X145 PL110X155 PL120X165 PL130X180 PL140X190 PL150X200 PL160X210 PL170X225 PL180X235
1,542 2,037 2,553 2,782 4,303 4,658 4,686 5,041 8,044 8,856
PL PL
152 195 174 212 253 282 297 333 434 434 434 434 564 564 506 506 644 644 542 694 694 665 866 866 991
PL2 ¹⁵⁄₁₆
1,120 1,310 1,330 1,530 1,530 1,410 2,050 2,130 2,800 2,780 4,310 4,300 4,910 5,060 8,460 8,900
³⁄₄
PL3 PL3 PL3 PL3 PL3
⁷⁄₈
PL1 PL1 PL1 PL1 PL1 PL1 PL1 PL1
³⁄₈
¹⁄₈
⁷⁄₁₆
³⁄₁₆
¹⁄₂
¹⁄₄
³⁄₄
PL3 ¹⁵⁄₁₆
³⁄₈
PL4 PL4 PL4
⁷⁄₁₆
¹⁄₂
⁷⁄₁₆
⁵⁄₈
¹⁄₂
PL190X250 14,760 PL200X260 15,570 PL220X285 18,670 PL240X305 20,070 PL260X325 20,520 PL280X355 29,000 PL300X375 37,860
PL1 ¹¹⁄₁₆
PL4 ¹⁵⁄₁₆
PL1 PL1
PL5 PL5 PL6 PL6 PL7 PL7 PL7 PL8 PL8 PL9 PL9
³⁄₄
⁷⁄₈
¹⁄₂
PL1 ¹⁵⁄₁₆
PL2 PL2 PL2 PL2 PL2 PL2 PL2 PL2 PL2
¹⁄₂
¹⁄₈
14,000 15,600 16,100 18,800 22,300 20,300 20,800 21,800 37,500 37,600
¹⁄₂
³⁄₁₆
⁷⁄₈
¹⁄₄
³⁄₈
PL075X115 1,107.0 PL080X120 1,306.0 PL085X125 1,328.0 PL090X130 1,520.0
¹⁄₂
⁷⁄₁₆
¹⁄₂
¹⁄₂
⁹⁄₁₆
PL10
⁵⁄₈
PL10 ¹⁄₂
PL2 ¹¹⁄₁₆
PL11
PL2 PL2
³⁄₄
PL11 ¹³⁄₁₆
1,120
⁷⁄₈
D-32
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