MIL C 882 bushings and isolation washers are used to eliminate metal-to-metal contact and break the vibration or shock transmission path. For example, the contact between a machine base and an anchor bolt as shown
| Bolt Dia | Washer OD | Washer ID | Washer Thickness | Net Area | Recommended in-lbs | Torque ft-lbs | Bolt Force Ibs |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| In | mm | in | mm | in | mm | in | mm | in2 | mm2 | |||
| 3/16 | 4.76 | 9/16 | 14.29 | 3/16 | 4.76 | 1/8 | 3.18 | 0.212 | 5.38 | 5 | 0.5 | 106 |
| 1/4 | 6.35 | 3/4 | 19.05 | 1/4 | 6.35 | 5/32 | 3.97 | 0.393 | 9.98 | 9 | 0.75 | 197 |
| 5/16 | 7.94 | 7/8 | 22.23 | 5/16 | 7.94 | 5/32 | 3.97 | 0.574 | 14.58 | 18 | 1.5 | 287 |
| 3/8 | 9.53 | 1 | 25.40 | 3/8 | 9.53 | 3/16 | 4.76 | 0.675 | 17.15 | 30 | 2.5 | 338 |
| 7/16 | 11.11 | 1-1/4 | 31.75 | 7/16 | 11.11 | 15/64 | 5.95 | 1.076 | 27.33 | 47 | 4 | 540 |
| 1/2 | 12.70 | 1-3/8 | 34.93 | 1/2 | 12.70 | 9/32 | 7.14 | 1.288 | 32.72 | 130 | 11 | 1,288 |
| 9/16 | 14.29 | 1-1/2 | 38.10 | 9/16 | 14.29 | 9/32 | 7.14 | 1.517 | 38.53 | 170 | 14.5 | 1,517 |
| 5/8 | 15.88 | 1-3/4 | 44.45 | 5/8 | 15.88 | 11/32 | 8.73 | 2.1 | 53.34 | 264 | 22 | 2,100 |
| 3/4 | 19.05 | 2 | 50.80 | 3/4 | 19.05 | 11/32 | 8.73 | 2.7 | 68.58 | 406 | 34 | 2,700 |
| 7/8 | 22.23 | 2-1/4 | 57.15 | 7/8 | 22.23 | 11/32 | 8.73 | 3.37 | 85.60 | 600 | 50 | 3,370 |
| 1 | 25.40 | 2-1/2 | 63.50 | 1 | 25.40 | 1/2 | 12.70 | 4.12 | 104.65 | 840 | 70 | 4,120 |
| 1-1/8 | 28.58 | 2-3/4 | 69.85 | 1-1/8 | 28.58 | 1/2 | 12.70 | 4.94 | 125.48 | 1,100 | 92 | 4,940 |
| 1-1/4 | 31.75 | 3 | 76.20 | 1-1/4 | 31.75 | 1/2 | 12.70 | 5.84 | 148.34 | 1,500 | 125 | 5,840 |
| 1-3/8 | 34.93 | 3-1/4 | 82.55 | 1-3/8 | 34.93 | 1/2 | 12.70 | 6.81 | 172.97 | 1,980 | 165 | 6,810 |
| 1-1/2 | 38.10 | 3-1/2 | 88.90 | 1-1/2 | 38.10 | 5/8 | 15.88 | 7.85 | 199.39 | 2,370 | 200 | 7,850 |
| 1-5/8 | 41.28 | 3-3/4 | 95.25 | 1-5/8 | 41.28 | 5/8 | 15.88 | 8.97 | 227.84 | 2,930 | 244 | 8,970 |
| 1-3/4 | 44.45 | 4 | 101.60 | 1-3/4 | 44.45 | 5/8 | 15.88 | 10.16 | 258.06 | 3,560 | 297 | 10,160 |
| 1-7/8 | 47.63 | 4-1/4 | 107.95 | 1-7/8 | 47.63 | 3/4 | 19.05 | 11.42 | 290.07 | 4,320 | 360 | 11,420 |
| 2 | 50.80 | 4-1/2 | 114.30 | 2 | 50.80 | 3/4 | 19.05 | 12.76 | 324.10 | 5,080 | 425 | 12,760 |
| 2-1/4 | 57.15 | 4-3/4 | 120.65 | 2-1/4 | 57.15 | 3/4 | 19.05 | 13.74 | 349.00 | 6,200 | 517 | 13,740 |
| 2-1/2 | 63.50 | 5 | 127.00 | 2-1/2 | 63.50 | 3/4 | 19.05 | 14.72 | 373.89 | 7,400 | 615 | 14,720 |
| 2-3/4 | 69.85 | 5-1/4 | 133.35 | 2-3/4 | 69.85 | 3/4 | 19.05 | 15.71 | 399.03 | 8,680 | 725 | 15,710 |
| 3 | 76.20 | 5-1/2 | 139.70 | 3 | 76.20 | 3/4 | 19.05 | 16.69 | 423.93 | 10,080 | 900 | 16,690 |
The properties of the Vibration Pad bushing material are ideally suited for vibration isolation and structure-borne noise reduction.
Washers & bushings are typically used in conjunction with MIL C 882 pads or waffle pads where the reduction of impact shock or isolation of transmitted vibration is required. Bushings are manufactured with the same properties as the MIL C 882 pad, and therefore offer years of service under the most severe operating conditions.