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 RATINGMAXIMUM LOAD (LBS)1100125015001750200022502500275030003600
A5.15.13.93.12.62.11.8
B6.45.54.33.42.82.41.8
C11.1118.77.165.13.8
D13.812.310.38.97.75.9

SHEAR

MINIMUM LOAD FOR 81% ISOLATION (LBS)

FORCING FREQUENCY IN CYCLES PER MINUTE
LOAD RATINGMAXIMUM LOAD (LBS)1100125015001750200022502500275030003600
A2.62.41.81.30.90.70.6****
B3.63.42.81.91.410.80.70.6**
C5.74.93.62.92.21.81.51.31.10.9
D7.175.13.93.12.62.11.81.61.2

* At these forcing frequencies lesser loads will yield 81% isolation.

 

DIMENSIONS

LEFT STUD (IN.) - THREADLEFT STUD (IN.) - LENGTHRIGHT STUD (IN.) - THREADRIGHT STUD (IN.) - LENGTHSUFFIX
8-327/328-327/3222
8-327/328-329/1623
8-323/88-323/8*14
8-323/88-329/1621
8-329/168-329/1626

* standard stud
** tapped hole

 

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MM316 Series 300 Cylindrical Mountings

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MM322 Series 300 Cylindrical Mountings