Page 154 - needle bearings

Machined-ring needle roller bearings
NTN

Inch series
With inner ring

Type MRʴʴMI

d 139.700ʙ203.200mm

Boundary dimensions Basic load ratings
dynamic static dynamic static
mm (!/25 . 4mm) N kgf

d D B C rs min 1) F s 2) Cr Cor Cr Cor
203.200( 8) 63.88 63.50(2 !/2) 3 165.100 6 325 000 680 000 33 000 69 500
139.700(5 !/2)
203.200( 8) 76.58 76.20(3) 3 165.100 5.5 390 000 870 000 39 500 88 500
152.400(6) 231.775( 9 !/8) 76.58 76.20(3) 3 184.150 8.5 435 000 915 000 44 500 93 000

165.100(6 !/2) 244.475( 9 %/8) 76.58 76.20(3) 3 196.850 8.5 455 000 990 000 46 500 101 000
177.800(7) 257.175(10 !/8) 76.58 76.20(3) 3 209.550 8.5 475 000 1 060 000 48 500 109 000
190.500(7 !/2) 269.875(10 %/8) 76.58 76.20(3) 4 222.250 7 495 000 1 140 000 50 500 116 000
203.200(8) 282.575(11 !/8) 76.58 76.20(3) 4 234.950 7 510 000 1 210 000 52 000 124 000

Note 1) Allowable minimum chamfer dimension r . 2) Allowable axial stroking value of inner ring against outer ring.

B-92