U-396-400

(Double groove side tie styles also known as loop insulators)
U-396
Manufacturer or Marking
No Name (Findlay) (USA)
Findlay (USA)
U-396
Size: 92mm X 107mm (3 x 4 ¼)
Example in Photo: No Name (Findlay) (USA)
Photo Credit: Elton Gish
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U-397
Manufacturer or Marking
P.P. Inc. (USA)
U-397
Size: 85mm X 98mm (3 x 3 )
Example in Photo: P.P. Inc. (USA)
Photo Credit: Bill Ostrander
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U-397A
Manufacturer or Marking
Franklin Porcelain (USA)
U-397A
Size: 82mm X 95mm (3 ¼ x 3 ¾)
Example in Photo: Franklin Porcelain (USA)
Photo Credit: Bill Ostrander
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U-397B
Manufacturer or Marking
No Name (Franklin Porcelain) (USA)
U-397B
Size: 84mm X 90mm (3 5/16 x 3 9/16)
Example in Photo: No Name (Franklin Porcelain) (USA)
Photo Credit: Bill Ostrander
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U-398
Manufacturer or Marking
THOMAS (USA)
U-398
Size: 79mm X 101mm (3 x 4)
Example in Photo: THOMAS (USA)
Photo Credit: Mid Norris
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U-399
Manufacturer or Marking
No Name (USA)
P.P. Inc. (USA)
U-399
Size: 107mm X 111mm (4 ¼ x 4 )
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
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U-399A
Manufacturer or Marking
No Name (Hartford Faience) (USA)
No Name (USA)
Findlay (USA)
U-399A
Size: 107mm X 111mm (4 ¼ x 4 ⅜)
Example in Photo: No Name
Photo Credit: National Insulator association
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U-399B
Manufacturer or Marking
No Name (USA)
No Name (Line Material) (USA)
CP (Canada)
COOK (USA)
Line Material (Illinois)
LOCE (USA)
P.P. Inc. (USA)
Square D (USA)
Triangle M (USA)
Victor Inc. Inc (USA)

NOTE: CP (Canada) Units should also have a U-Number in the “Worldwide Porcelain Insulators Chart” range as U-1-999 are US only styles. No “Worldwide Porcelain Insulators” U-Number is yet available for this unit.
U-399B
Size: 107mm X 123mm (4 ¼ x 4 ⅞)
Example in Photo: No Name (USA)
Photo Credit: Mid Norris
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U-399C
Manufacturer or Marking
No Name (Locke) (USA)
LOCKE (6507) (USA)
U-399C
Size: 95mm X 104mm (3 ¾ x 4 ⅛)
Example in Photo: LOCKE (6507) (USA)
Photo Credit: Bill Rohde
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U-400
Manufacturer or Marking
O-B (USA)
U-400
Size: 95mm X 101mm (3 ¾ x 4)
Example in Photo: O-B (USA)
Photo Credit: Matt Grayson
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U-400A
Manufacturer or Marking
No Name (USA)
O-B (USA)
U-400A
Size: 95mm X 101mm (3 ¾ x 4)
Example in Photo: No Name (USA)
Photo Credit: Matt Grayson
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U-400B
Manufacturer or Marking
No Name (Illinois)(USA)
Line Material & M 694 (USA)
Line Material & Triangle M (Illinois) (USA)
U-400B
Size: 104mm X 95mm (4 ¼ x 3 ¾)
Example in Photo: Line Material & Triangle M (Illinois) (USA)
Photo Credit: Elton Gish
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