U-401-408

(Heavy cable top groove insulators)
U-401
Manufacturer or Marking
No Name (O-B) (USA)
U-401
Size: 95mm X 93mm (3 ¾ x 3 ⅝)
Example in Photo: No Name (O-B) (USA)
Photo Credit: Rick Soller
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U-401A
Manufacturer or Marking
No Name (O-B) (USA)
U-401A
Size: 95mm X 95mm (3 ¾ x 3 ¾)
Example in Photo: No Name (O-B) (USA)
Photo Credit: Rick Soller
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U-401B
Manufacturer or Marking
Illinois or L-M (USA)
U-401B
Size: 95mm X 95mm (3 ¾ x 3 ¾)
Example in Photo: Illinois or L-M (USA)
Photo Credit: Fred Collier
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U-401C
Manufacturer or Marking
No Name (USA)
U-401C
Size: 98mm X 76mm (3 x 3)
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
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U-402
Manufacturer or Marking
No Name (USA)
JD (USA)
Knox (USA)
Pinco (USA)

NOTE: In 2008 and older reference books, there was a U-402A listed. Listing are now part of U-402.
U-402
Size: 101mm X 107mm (4 x 4 ½)
Example in Photo: JD (USA)
Photo Credit: Matt Grayson
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U-402A
Manufacturer or Marking
Pinco (USA)

NOTE: In 2008 and older reference books, there was a U-402B listed. Listing are now part of the New U-402A.
U-402A
Size: 107mm X 111mm (4 ¼ x 4 ⅜)
Example in Photo: Pinco (USA)
Photo Credit: Walter Baumgardt
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U-403
Manufacturer or Marking
LAPP (USA)
U-403
Size: 101mm X 111mm (4 x 4 ⅜)
Example in Photo: LAPP (USA)
Photo Credit: Charles Robinson
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U-403A
Manufacturer or Marking
LAPP (USA)
U-403A
Size: 114mm X 114mm (4 ½ x 4 ½)
Example in Photo: LAPP (USA)
Photo Credit: Shaun Kotlarsky
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U-403B
Manufacturer or Marking
No Name (USA)
LAPP (USA)
U-403B
Size: 101mm X 114mm (4 x 4 ½)
Example in Photo: LAPP (USA)
Photo Credit: Mid Norris
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U-405
Manufacturer or Marking
New Lexington (USA)

NOTE: No units are known. Drawing from Catalog.
U-405
Size: 101mm X 136mm (4 x 5 ⅜)
Example in Photo: New Lexington (USA)
NOTE: Photo created from drawing, by Elton Gish
Photo Credit: Elton Gish
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U-406
Manufacturer or Marking
New Lexington (USA)

NOTE: No units are known. Drawing from Catalog.
U-406
Size: 107mm X 139mm (4 ¼ x 5 ½)
Example in Photo: New Lexington (USA)
NOTE: Photo created from drawing, by Elton Gish
Photo Credit: Elton Gish
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U-406A
Manufacturer or Marking
No Name (Fred Locke) (USA)
U-406A
Size: 101mm X 136mm (4 x 5 ⅜)
Example in Photo: No Name (Fred Locke) (USA)
Photo Credit: Ken Willick
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U-407
Manufacturer or Marking
Locke (USA)
No Name (Locke) (USA)
U-407
Size: 147mm X 177mm (5 ¾ x 7)
Example in Photo: No Name (Locke) (USA)
Photo Credit: Mid Norris
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U-407A
Manufacturer or Marking
No Name (New Lexington) (USA)
U-407A
Size: 142mm X 177mm (5 x 7)
Example in Photo: No Name (New Lexington)
Photo Credit: Elton Gish
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U-408
Manufacturer or Marking
No Name (New Lexington) (USA)
No Name (Pittsburg) (USA)
U-408
Size 107mm X 136mm (4 ¼ x 5 )
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish
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U-408A
Manufacturer or Marking
No Name (New Lexington) (USA)
U-408A
Size: 114mm X 139mm (4 ½ x 5 ½)
Example in Photo: No Name (New Lexington) (USA)
Photo Credit: Elton Gish
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