RUBBER PARTS | Vibration & Shock Mounts
MM321 Series 300 Cylindrical Mountings
MM321
SERIES 300 CYLINDRICAL MOUNTINGS
FOR LOADS TO 13.8 POUNDS IN COMPRESSION; 7.1 POUNDS IN SHEAR
DESCRIPTION
The small, yet rugged design and the broad range of sizes make ESTCO MM321 Series 300 cylindrical mountings ideal for a wide range of applications. They have been used on electric motors and generators, fans and blowers, relays and control panels, business machines timing devices and air handling equipment.
ESTCO cylindrical mountings can be loaded in compression, in shear, or in combination compression and shear. Additional standard stud combinations have been added to the line to allow wider applications of these mountings to a customer’s design requirements.
All engineering data herein apply to mountings with a studded or tapped insert at each end.
The maximum unthreaded portion of the stud does not exceed 1/16-inch.
DIMENSIONS
LOAD DEFLECTION GRAPH
Deflections below the line X—-X are considered safe practice for static loads; data above that line are useful for calculating deflections under dynamic loads
SELECTION GUIDE
COMPRESSION
MINIMUM LOAD FOR 81% ISOLATION (LBS)
| FORCING FREQUENCY IN CYCLES PER MINUTE | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| LOAD RATING | MAXIMUM LOAD (LBS) | 1100 | 1250 | 1500 | 1750 | 2000 | 2250 | 2500 | 2750 | 3000 | 3600 |
| A | 5.1 | 5.1 | 3.9 | 3.1 | 2.6 | 2.1 | 1.8 | ||||
| B | 6.4 | 5.5 | 4.3 | 3.4 | 2.8 | 2.4 | 1.8 | ||||
| C | 11.1 | 11 | 8.7 | 7.1 | 6 | 5.1 | 3.8 | ||||
| D | 13.8 | 12.3 | 10.3 | 8.9 | 7.7 | 5.9 | |||||
SHEAR
MINIMUM LOAD FOR 81% ISOLATION (LBS)
| FORCING FREQUENCY IN CYCLES PER MINUTE | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| LOAD RATING | MAXIMUM LOAD (LBS) | 1100 | 1250 | 1500 | 1750 | 2000 | 2250 | 2500 | 2750 | 3000 | 3600 |
| A | 2.6 | 2.4 | 1.8 | 1.3 | 0.9 | 0.7 | 0.6 | * | * | * | * |
| B | 3.6 | 3.4 | 2.8 | 1.9 | 1.4 | 1 | 0.8 | 0.7 | 0.6 | * | * |
| C | 5.7 | 4.9 | 3.6 | 2.9 | 2.2 | 1.8 | 1.5 | 1.3 | 1.1 | 0.9 | |
| D | 7.1 | 7 | 5.1 | 3.9 | 3.1 | 2.6 | 2.1 | 1.8 | 1.6 | 1.2 | |
* At these forcing frequencies lesser loads will yield 81% isolation.
DIMENSIONS
| LEFT STUD (IN.) - THREAD | LEFT STUD (IN.) - LENGTH | RIGHT STUD (IN.) - THREAD | RIGHT STUD (IN.) - LENGTH | SUFFIX |
|---|---|---|---|---|
| 8-32 | 7/32 | 8-32 | 7/32 | 22 |
| 8-32 | 7/32 | 8-32 | 9/16 | 23 |
| 8-32 | 3/8 | 8-32 | 3/8 | *14 |
| 8-32 | 3/8 | 8-32 | 9/16 | 21 |
| 8-32 | 9/16 | 8-32 | 9/16 | 26 |
* standard stud
** tapped hole
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