321 Studios 29AV User Manual

Eyebolt Applications

For Installation of

For top or bottom inserts, use 6

Control 29AV

When suspending JBL Control 29AV loudspeakers, you MUST utilize Load-Rated Steel Forged
Shoulder Eyebolts. The load rating must be stamped on the side of the eyebolt and there must

be a shoulder, as shown in Fig 1. The correct threading for the Control 29AV is M6. This means
that the threaded shaft has a diameter of 6mm. The threaded shaft length will vary according to
which insert point is being utilized.

Top & Bottom Inserts -- When using the installation points at the top and bottom of the
cabinet, where the flat surfaces are, the eyebolt threads directly into the insert. Be sure to tighten

the bolt all the way down so that the shoulder is snug against the surface of the cabinet. To do
this, you must ensure the correct length of bolt so that the threads do not “bottom out” (stop
turning) before the shoulder reaches the cabinet surface. For the top or bottom inserts, the shaft
should be 12mm (1/2 inch). See Figure 2:

mm x 1mm pitch x 12 mm thread
length steel forged shoulder

eyebolts

Side Inserts -- When using the installation points on the sides of the cabinet, you must use the

For side inserts, use 6 mm x 1mm

included bevel washers. These washers provide a uniform flat surface for the shoulder of the bolt
and also compensate for the draft (angle) of the sidewalls of the cabinet. In this application, the
thread length must be longer to reach through the washer, while not “bottoming out”. The shaft
should be 25.4 mm (1 inch). See Figure 3:

pitch x 25.4 mm thread length
steel forged shoulder eyebolt.

CAUTION

Installation must only be done by qualified persons using safe

rigging practices. Load eyebolts in accordance with the eyebolt

manufacturer’s loading guidelines.

For additional information, refer to JBL Professional’s Tech Note

Vol 1 #14, “Basic Principles for Suspending Loudspeakers”

Eyebolt Sources -- These sizes of forged shoulder steel eyebolts are available from a wide
variety of industrial hardware suppliers, or directly from JBL Professional:

EB-6X12 = 6 mm x 1mm pitch x 12 mm thread length, forged shoulder steel eyebolt, load

rated.

EB-6X25 = 6 mm x 1 mm pitch x 25.4 mm thread length, forged shoulder steel eyebolt, load

rated.

EYEBOLT APP 06/01