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SUPER PRECISION<br />
2<br />
C<br />
BALL SCREW SUPPORT SERIES<br />
INCH SERIES<br />
• Designed <strong>for</strong> maximum axial rigidity, low drag torque, and<br />
extreme control of lateral eccentricity.<br />
• Manufactured to ABEC 9/ISO P2 axial tolerances.<br />
• Nonseparable angular-contact type design (60˚ contact angle).<br />
• Manufactured to ABEC 7/ISO P4 radial and envelope tolerances.<br />
• Maximum complement of balls.<br />
• Supplied prelubricated with heavy-duty grease NLGI #2.<br />
• Packaged in DB arrangement [can be mounted in duplexed<br />
pairs and in multiplexed sets in either Back-to-Back<br />
(DB), Face-to-Face (DF) or Tandem (DT) arrangements].<br />
D<br />
d<br />
C<br />
[2xC]<br />
r<br />
r<br />
d<br />
Bore<br />
D<br />
O.D.<br />
C<br />
Width (1)<br />
Suggested Shoulder Diameters<br />
Ball Qty.<br />
x Dia. Wt. (2) r<br />
Rad. (3) Shaft Housing Shaft Dia. Housing Dia.<br />
Max. Min. Max. Min. Max. Min. Max. Min.<br />
Bearing Number<br />
mm/in. mm/in. kg/lbs mm/in. mm/in. mm/in. mm/in. mm/in.<br />
MM9306WI2H 20 47 15.88 12 x 7.9 0.130 0.8 27.508 27.254 41.681 41.427 19.995 19.990 47.008 47.000<br />
0.7874 1.8504 0.6250 12 x 5/16 0.28 0.031 1.0830 1.0730 1.6410 1.6310 0.7872 0.7870 1.8507 1.8504<br />
MM9308WI2H 23.8 62 15.88 17 x 7.9 0.250 0.8 33.553 33.299 55.347 55.093 23.833 23.828 62.006 61.999<br />
0.9385 2.4409 0.6250 17 x 5/16 0.56 0.031 1.3210 1.3110 2.1790 2.1690 0.9383 0.9381 2.4412 2.4409<br />
MM9310WI2H 38.1 72 15.88 18 x 8.7 0.280 0.8 47.371 47.117 62.967 62.713 38.092 38.085 72.006 71.999<br />
1.5000 2.8346 0.6250 18 x 11/32 0.62 0.031 1.8650 1.8550 2.4790 2.4690 1.4997 1.4994 2.8349 2.8346<br />
MM9311WI3H 44.5 76.2 15.88 20 x 8.7 0.290 0.8 52.248 51.994 67.869 67.615 44.468 44.460 76.208 76.200<br />
1.7510 3.0000 0.6250 20 x 11/32 0.63 0.031 2.0570 2.0470 2.6720 2.6620 1.7507 1.7504 3.0003 3.0000<br />
MM9313WI5H 57.2 90 15.88 24 x 8.7 0.360 0.8 65.456 65.202 81.178 80.924 57.142 57.135 90.007 90.000<br />
2.2500 3.5433 0.6250 24 x 11/32 0.80 0.031 2.5770 2.5670 3.1960 3.1860 2.2497 2.2494 3.5436 3.5433<br />
MM9316WI3H 76.2 110 15.88 30 x 8.7 0.470 0.8 85.852 85.598 101.600 101.346 76.192 76.185 110.007 110.000<br />
3.0000 4.3307 0.6250 30 x 11/32 1.04 0.031 3.3800 3.3700 4.0000 3.9900 2.9997 2.9994 4.3310 4.3307<br />
MM9321WI3H 101.6 145 22.23 37 x 9.5 1.180 1.0 112.217 111.963 134.645 134.391 101.592 101.585 145.011 145.001<br />
4.0000 5.7087 0.8750 37 x 3/8 2.60 0.039 4.4180 4.4080 5.3010 5.2910 3.9997 3.9994 5.7091 5.7087<br />
MM9326WI6H 127 180 22.23 35 x 12.7 1.750 1.0 143.993 143.739 167.919 167.665 126.992 126.985 180.010 180.000<br />
5.0000 7.0866 0.8750 35 x 1/2 3.85 0.039 5.6690 5.6590 6.6110 6.6010 4.9997 4.9994 7.0870 7.0866<br />
(1) Width tolerance of preloaded bearing set +0.000/-0.254 mm (+0.0000/-0.0100 in.).<br />
(2) Single bearing.<br />
(3) ABMA STD 20 (r as max).<br />
A<br />
202 TIMKEN MACHINE TOOL CATALOG