Page 367 - SKF-bearing-housings

Design considerations

Attachment bolt recommendations
In typical applications, 8.8 class hexagon head
bolts, in accordance with ISO 4014, can be
used together with washers. If the load does
not act perpendicularly toward the base, it
may be necessary to use stronger 10.9 class
bolts.
SKF housings can withstand loads resulting
from tightening the attachment bolts to the
torque values recommended by bolt manufac-
turers († table 3). They are valid for oiled,
but otherwise untreated thread surfaces. SKF
cannot guarantee that tightening to the rec-
ommended value provides sufficient anchor-
ing. Make sure that attachment bolts, dowels
or stops, and a sufficiently strong support can
accommodate all occurring loads.
7
Table 3
Load carrying capacity and torque values for cap bolts and attachment bolts

Q 120° Q 150° Q 180°

Housing Cap bolts Attachment bolts
Size Yield point for four bolts Designation Tightening Size Tightening
Q 120° Q 150° Q 180° to ISO 4014 torque torque 1)
– kN – Nm – Nm

217-517 300 170 150 M 10¥75 50 M 20 385
218-518 440 250 220 M 12¥80 80 M 20 385
220-520 440 250 220 M 12¥90 80 M 24 665
222-522 440 250 220 M 12¥90 80 M 24 665
224-524 800 460 400 M 16¥110 150 M 24 665
226-526 800 460 400 M 16¥120 150 M 24 665
228-528 1 250 720 620 M 20¥130 200 M 30 1 310
230-530 1 250 720 620 M 20¥140 200 M 30 1 310
232-532 1 250 720 620 M 20¥140 200 M 30 1 310
234-534 1 800 1 040 900 M 24¥160 350 M 30 1 310
236-536 1 800 1 040 900 M 24¥160 350 M 30 1 310
238-538 1 800 1 040 900 M 24¥160 350 M 36 2 280
240-540 1 800 1 040 900 M 24¥160 350 M 36 2 280
244-544 1 800 1 040 900 M 24¥180 400 M 36 2 280
248-548 2 860 1 650 1 430 M 30¥200 400 M 36 2 280

1) Recommended by bolt manufacturers.

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