Insulating Covers
TO-3 Insulating Covers
Insulating covers are designed to provide protection from accidental shock
during field service or repair.
Pan head screws not provided–MS 51957-30 or equivalent recommended–secure the cover
to the TO-3. At the typical mounting screw torque of 0.68–0.90 Nm (6-8 inch pounds), the
TO-3 cover material cold-flows around the screw head to securely fasten the cover.
Included are No.6 split washers as inserts to provide electrical connection of mounting screws
to the TO-3 collector and an insulating snap-in cover for the screw heads. A test probe hole is
provided in the top of the cover.
The 8903VB is made from thermoplastic polyester that meets the requirements of UL Bulletin
94 V-O. In addition to its excellent flammability rating, thermoplastic polyester offers resistance
to most chemical environments, heat deflection temperature to 215.6°C (420°F) and UL contin-
uous use temperature of 130°C (266°F).
41.91
(1.650)
1.19
(0.047)
DIA THRU
ORDERING INFORMATION
28.45
(1.120)
Part number
8903NWG
8903VBG
Material
Color
White
Black
Flammability standards
Self-extinguishing UL 94 V-2
Nylon
6.22
Thermoplastic polyester
Self-extinguishing UL 94 V-0 UL 492 Type 1
(0.245)
THRUTYP (2)
DIA
30.23
(1.190)
4.57
(0.180)
9.91
(0.390)
22.61
(0.890)
39.88
(1.570)
Teflon-filled Acetal Insulators for TO-3
1.47
(0.058)
Part number
103G
Fits notch
4.83 (0.190)
6.35 (0.250)
“A” Dim
4.90 (0.193)
6.35 (0.250)
109G
9.52
(0.375)
Ø
3.58
(0.141)
Ø
"A"
5.54
(0.218)
Teflon-filled Acetal Bushings for TO-3
Part number
110G
“I.D.”
“O.D.”
“T”
5.03/5.21(0.198/0.205)
6.43/6.60 (0.253/0.260)
6.81/6.98 (0.268/0.275)
7.82/8.00 (0.308/0.315)
1.57/1.40 (0.062/0.055)
1.57/1.40 (0.062/0.055)
113G
"O.D."
"I.D."
"T"
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