Page 142 - needle bearings

Machined-ring needle roller bearings
NTN

Inch series
Without inner ring

Type MR

FW 15.875ʙ63.500mm

Boundary dimensions Basic load ratings Limiting speeds
dynamic static dynamic static
mm (!/25 . 4mm) N kgf r/min
grease oil
Fw D C rs min 1) Cr Cor Cr Cor (approx.)
28.575(1 !/8) 19.05(#/4) 0.6 16 700 16 700 1 700 1 700 17 000 25 000
+0.027
15.875(%/8)
+0.016
28.575(1 !/8) 25.40(1) 0.6 21 500 23 000 2 190 2 350 17 000 25 000
31.750(1 !/4) 19.05(#/4) 1 19 500 21 100 1 980 2 150 14 000 21 000
+0.033
19.050(#/4) +0.020
31.750(1 !/4) 25.40(1) 1 25 000 29 100 2 550 2 970 14 000 21 000
34.925(1 #/8) 19.05(#/4) 1 21 900 25 600 2 240 2 610 12 000 18 000
+0.033
22.225(&/8) +0.020
34.925(1 #/8) 25.40(1) 1 28 200 35 500 2 870 3 600 12 000 18 000
38.100(1 !/2) 19.05(#/4) 1 23 000 28 100 2 340 2 870 11 000 16 000
+0.033
25.400(1) +0.020
38.100(1 !/2) 25.40(1) 1 29 500 38 500 3 000 3 950 11 000 16 000
41.275(1 %/8) 25.40(1) 1 32 500 45 000 3 300 4 600 9 500 14 000
+0.033
28.575(1 !/8) +0.020
41.275(1 %/8) 31.75(1 !/4) 1 40 500 60 000 4 100 6 100 9 500 14 000
44.450(1 #/4) 25.40(1) 1 35 000 51 000 3 550 5 200 8 500 13 000
+0.041
31.750(1 !/4) +0.025
44.450(1 #/4) 31.75(1 !/4) 1 43 500 68 000 4 450 6 950 8 500 13 000
47.625(1 &/8) 25.40(1) 1 37 000 57 500 3 800 5 850 7 500 11 000
+0.041
34.925(1 #/8) +0.025
47.625(1 &/8) 31.75(1 !/4) 1 46 500 76 500 4 750 7 800 7 500 11 000
52.388(2 !/16) 25.40(1) 1.5 41 000 61 000 4 150 6 250 7 500 11 000
+0.041
38.100(1 !/2) +0.025
52.388(2 !/16) 31.75(1 !/4) 1.5 51 000 81 500 5 200 8 300 7 500 11 000
55.562(2 #/16) 25.40(1) 1.5 43 500 68 000 4 450 6 950 6 500 9 500
+0.041
41.275(1 %/8) +0.025
55.562(2 #/16) 31.75(1 !/4) 1.5 54 500 90 500 5 550 9 250 6 500 9 500
58.738(2 %/16) 25.40(1) 1.5 44 500 72 000 4 550 7 350 6 000 9 000
+0.041
44.450(1 #/4) +0.025
58.738(2 %/16) 31.75(1 !/4) 1.5 55 500 95 500 5 700 9 750 6 000 9 000
+0.041
47.625(1 &/8) +0.025 61.912(2 &/16) 31.75(1 !/4) 1.5 59 000 105 000 6 000 10 700 5 500 8 500
65.088(2 (/16) 25.40(1) 1.5 49 500 86 000 5 050 8 800 5 500 8 000
+0.049
50.800(2) +0.030
65.088(2 (/16) 31.75(1 !/4) 1.5 62 000 114 000 6 300 11 700 5 500 8 000
76.200(3) 38.10(1 !/2) 1.5 83 500 142 000 8 500 14 500 4 700 7 000
+0.049
57.150(2 !/4) +0.030
76.200(3) 44.45(1 #/4) 1.5 97 000 173 000 9 850 17 600 4 700 7 000
+0.049
63.500(2 !/2) +0.030 82.550(3 !/4) 38.10(1 !/2) 2 88 000 158 000 8 950 16 100 4 300 6 500

Note 1) Allowable minimum chamfer dimension r.

B-80