DM-6/DM-4 DiscMounts' mount head specification:
(All specifications are subject to change without notice.)

Azimuth axis (Tripod) mounting hole:

DM-6-3/8 - 16 centered on a 6” flat disc

DM-4- 3/8 - 16 (1/2” max depth) centered on a 4” flat disc

Altitude axis (Saddle) mounting holes:
DM-6: 5/16" - 18 spaced 3" apart centered on 6" disc
DM-4: 1/4 " - 20 spaced 3" apart centered on 4 " disc

DM-6 Angle adaptor mounting holes:

#10-32 spaced 1.5" apart

Material: All aluminum is 6061-T6 hard coat anodized and machined to close tolerance from sold blocks. All hardware, shafts, and ball bearings are made from stainless steel

Weight no accessories:

DM-6: 16.2 lbs.

DM-4: 5.2lbs

Dimensions:

DM-6 Head only: 7 1/2" long, 6" wide, 8 3/8" high

Height to center of Altitude disc: 5 1/2"

DM-4 Head only: 5 3/4" long, 4" wide, 5" high

Height to center of Altitude diec: 2 1/2"

Head Load weight:

DM-6: 50 lbs (load weight varies with diameter and length of tube)

DM-4: 20 lbs (load weight varies with diameter and length of tube)

Eyepiece/Camera deferential load weight to maintain balance (at end of focuser):

DM-6: 0 to 2.2 lbs. typical

DM-4: 0 to 1.5 lbs. typical

Please note this can change up or down depending on the telescope and the highest magnification required.