U-2-43 (Pony styles with one skirt & wire groove)

U-2
Manufacturer or Marking
No Name (Fred Locke Attic Dig) (USA)

NOTE: in 2008 reference books this was listed as U-2B. The old listings for 2A are now part of U-3

Size: 53mm X 63mm (2 ⅛X 2 ½)
Example in Photo: No Name (Fred Locke Attic Dig) (USA)
Photo Credit: Ken Willick

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U-3
Manufacturer or Marking
No Name (Fred Locke) (USA)
Fred Locke (USA)
LAPP (USA)
No Name (USA)
O-B (USA)

Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky

Note: Trimming variation.
Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky

Size: O-B version (Old U-2)
Example in Photo: O-B (USA)
Photo Credit: Elton Gish

Size: 58mm X 69mm (2 5/16 X 2 ¾)

Variations: Click on the thumbnail above to see style variations

Variations: Tap on the thumbnail above to see style variations

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U-3A
Manufacturer or Marking
No Name (Thomas Dry Process) (USA)
LOCKE (USA)

Note: Dry Process example
Example in Photo: No Name (Thomas Dry Process) (USA)
Photo Credit: Elton Gish

Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky

Size: 60mm X 73mm (2 ⅜ X 2 ⅞)

Variations: Click on the thumbnail above to see style variations

Variations: Tap on the thumbnail above to see style variations

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U-4
Manufacturer or Marking
No Name (Lima) (USA)
Fred Locke (USA)
438B (Fred Locke) (USA)

Size: 60mm X 76mm (2 ⅜ x 3)
Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky

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U-6
Manufacturer or Marking
No Name (Pittsburg) (USA)

NOTE: In 2008 and older reference books, there was a U-7 listed. All listings are now part of U-6 as it was a trimming variation

Size: 63mm X 66mm (2 ½ x 2 ⅝)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish

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U-9
Manufacturer or Marking
No Name (USA)
LAPP (USA)

NOTE: in 2008 and older reference books, there was a U-9A Listed. All listings are now part of U-9

Size: 53mm X 76mm (2 ⅛ x 3)
Example in Photo: No Name (USA)
Photo Credit: Jim Frustieri

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U-10
Manufacturer or Marking
No Name (USA)

NOTE: in 2008 and older reference books, there was a U-10A Listed. All listings are now part of U-10

Size: 53mm X 69mm (2 ⅛ x 2 ¾)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-11
Manufacturer or Marking
No Name (Illinois 107) (USA)

Size: 53mm X 69mm (2 ⅛ x 2 ¾)
Example in Photo: No Name (Illinois 107) (USA)
Photo Credit: Bill Vincent

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U-11A
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
G (USA)

Size: 60mm X 79mm (2 ⅜ x 3 ⅛)
Example in Photo: G (USA)
Photo Credit: Mid Norris

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U-11B
Manufacturer or Marking
No Name (USA)
No Name (Thomas, Dry Process, Carved Top) (USA)
O-B (USA)

Example in Photo: No Name (USA)
Photo Credit: Elton Gish

Note: Trim Variation
Example in Photo: No Name (USA)
Photo Credit: Mid Norris

Size: 66mm X 85mm (2 ⅝ x 3 ⅜)

Variations: Click on the thumbnail above to see style variations

Variations: Tap on the thumbnail above to see style variations

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U-11C
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (USA)

Size: 71mm X 85mm (2 13/16 x 3 ⅜)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-12
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (USA)
G (Dry Process) (USA)
Westinghouse (USA)

Size: 57mm X 85mm (2 ¼ x 3 ⅜)
Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky

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U-12A
Manufacturer or Marking
No Name (Pittsburg) (USA)

Size: 57mm X 82mm (2 ¼ x 3 ¼)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish

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U-13
Manufacturer or Marking
No Name (USA)
No Name (Dry Process) (USA)
No Name (Pittsburg) (USA)
Square D (Dry Process) (USA)
Westinghouse (USA)

Size: 60mm X 82mm (2 ⅜ x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-14
Manufacturer or Marking
No Name (USA)

Size: 53mm X 79mm (2 ⅛ x 3 ⅛)
Example in Photo: No Name (USA)
Photo Credit: Michele Kotlarsky

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U-14A
Manufacturer or Marking
No Name (USA)
No Name (Square D) (USA)
6109 // 6109 (USA)

Size: 60mm X 88mm (2 ⅜ x 3 ½)
Example in Photo: No Name (Square D) (USA)
Photo Credit: Bob Berry

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U-14B
Manufacturer or Marking
No Name (P.P. Inc) (USA)

Size: 55mm X 92mm (2 3/16 x 3 ⅝)
Example in Photo: No Name (P.P. Inc) (USA)
Photo Credit: Jeff Hogan

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U-15
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (Dry Process) (USA)
No Name (USA)
Findlay (USA)
Illinois (109) (USA)
Knox (USA)
O-B (USA)

Size: 60mm X 88mm (2 ⅜ x 3 ½)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-15A
Manufacturer or Marking
No Name (USA)

Size: 63mm X 95mm (2 ½ x 3 ¾)
Example in Photo: No Name
Photo Credit: Shaun Kotlarsky

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U-15B
Manufacturer or Marking
No Name (Dry Process) (USA)

Size: 60mm X 88mm (2 ⅜ x 3 ½)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Elton Gish

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U-17
Manufacturer or Marking
No Name (Thomas, MLOD, Dry Process, Carved Top) (USA)
No Name (Thomas, Dry Process) (USA)
No Name (Thomas, MLOD, Dry Process) (USA)

Size: 57mm X 82mm (2 ¼ X 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Bill Plunkett

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U-17A
Manufacturer or Marking
Consumers Insulator Co. (Dry Process) (USA)
New Lexington (USA)

Size: 60mm X 82mm (2 ⅜ x 3 ¼)
Example in Photo: Consumers Insulator Co. (USA)
Photo Credit: Elton Gish

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U-18
Manufacturer or Marking
No Name (Thomas, MLOD, Dry Process, Carved Top) (USA)
No Name (Thomas, Dry Process, Carved top) (USA)
No Name (MLOD, Dry Process) (USA)
No Name (Thomas, MLOD, Dry Process) (USA)

Size: 60mm X 82mm (2 ⅜ x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Jim Frustieri

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U-18A
Manufacturer or Marking
No Name (Dry Process) (USA)

Size: 57mm X 76mm (2 ¼ x 3)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Elton Gish

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U-18B
Manufacturer or Marking
No Name (Dry Process) (USA)

Size: 57mm X 82mm (2 ¼ x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Steve Coffman

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U-19
Manufacturer or Marking
No Name (USA)
No Name (Lima) (USA)
O-B (USA)

Size: 65mm X 85mm (2 9/16 x 3 ⅜)
Example in Photo: O-B (USA)
Photo Credit: Elton Gish

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U-21
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
COOK (10) (USA)
Illinois Map (USA)
Knox (USA)

Size: 60mm X 82mm (2 ⅜ x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky

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U-22
Manufacturer or Marking
No Name (Dry Process) (USA)

Size: 60mm X 66mm (2 ⅜ x 3 ⅝)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Elton Gish

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U-26
Manufacturer or Marking
No Name (USA)
No Name (Pittsburg) (USA)
Findlay (USA)
G.P.Co. (109) (USA)
Illinois Map (USA)
Westinghouse (USA)

Size: 60mm X 82mm (2 ⅜ x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: National Insulator association

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U-28
Manufacturer or Marking
No Name (Mold lines) (USA)
No Name (Thomas 1012) (USA)
No Name (USA)

Size: 60mm X 73mm (2 ⅜ x 2 ⅞)
Example in Photo: No Name (Mold lines) (USA)
Photo Credit: Elton Gish

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U-29
Manufacturer or Marking
No Name (USA)

Size: 63mm X 66mm (2 ½ x 2 ⅝)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-30
Manufacturer or Marking
No Name (Lima)

NOTE: In 2008 and older reference books, This was listed as U-30A. U-30, U-30A and U-30B are now all consolidated in to U-30 as they are just variations in the trimming process.

Size: 63mm X 63mm (2 ½ x 2 ½)
Example in Photo: No Name (Lima)
Photo Credit: Shaun Kotlarsky

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U-31
Manufacturer or Marking
P.P. Inc. (USA)

Size: 57mm X 83mm (2 ¼ x 3 ¼)
Example in Photo: P.P. Inc. (USA)
Photo Credit: Charles Robinson

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U-31A
Manufacturer or Marking
No Name (USA)

Size: 57mm X 79mm (2 ¼ x 3 ⅛)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-32
Manufacturer or Marking
No Name (USA)
Square D (Dry Process) (USA)

NOTE: In 2008 and older reference books, there was a U-32A Listed. It was just a height variation of U-32 so has been removed.

Size: 60mm X 82mm (2 ⅜ x 3 3 ¼)
Example in Photo: Square D (Dry Process) (USA)
Photo Credit: Shaun Kotlarsky

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U-33
Manufacturer or Marking
No Name (Dry Process) (USA)

Size: 60mm X 88mm (2 ⅜ x 3 ½)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Jim Frustieri

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U-35
Manufacturer or Marking
No Name (Lima) (USA)

Size: 60mm X 69mm (2 ⅜ x 2 ¾)
Example in Photo: No Name (Lima) (USA)
Photo Credit: Elton Gish

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U-36
Manufacturer or Marking
No Name (Pittsburg, MLOD) (USA)

Size: 63mm X 69mm (2 ½ x 2 ¾)
Example in Photo: No Name (Pittsburg, MLOD) (USA)
Photo Credit: Elton Gish

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U-39
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
Fred Locke (USA)
'GLEN' (Fred Locke) (USA)

NOTE: Pre 2008 reference books there was a U-38 and 39. Both are the same insulator. The difference in appearance is from the trimming operation. Both are now known as U-39

Example in Photo: Fred Locke (USA)
Photo Credit: Elton Gish

Note: Old U-38, Now U-39
Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky

Note: U-39 Varation
Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky

Size: 57mm X 66mm (2 ¼ x 2 ⅝)

Variations: Click on the thumbnail above to see style variations

Variations: Tap on the thumbnail above to see style variations

To directly link to this image copy and paste below URL:

U-39A
Manufacturer or Marking
No Name (Lima) (USA)

Size: 63mm X 82mm (2 ½ x 3 ¼)
Example in Photo: No Name (Lima) (USA)
Photo Credit: Ken Willick

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U-40
Manufacturer or Marking
No Name (USA)
Fred Locke (USA)

Size: 53mm X 63mm (2 ⅛ x 2 ½)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish

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U-40A
Manufacturer or Marking
No Name (Akron HP) (USA)

Size: 57mm X 63mm (2 ¼ x 2 ½)
Example in Photo: No Name (Akron HP) (USA)
Photo Credit: Elton Gish

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U-41
Manufacturer or Marking
No Name (Concentric Rings on Dome) (USA)

Size: 57mm X 88mm (2 ¼ x 3 ½)
Example in Photo: No Name (Concentric Rings on Dome) (USA)
Photo Credit: Elton Gish

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U-42
Manufacturer or Marking
No Name (USA)
No Name (Macomb? Dry Process) (USA)
MACOMB (Dry Process) (USA)
Square D (Dry Process) (USA)

NOTE: in 2008 and older reference books, there is a U-42A and U-42B. They are now consolidated in to the U-42 listing as they are just trimming variations.

Size: 55mm X 88mm (2 3/16 X 3 ½)
Example in Photo: MACOMB (Dry Process) (USA)
Photo Credit: Elton Gish

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U-42A
Manufacturer or Marking
No Name (Pittsburg) (USA)

NOTE: In 2008 and older reference books, There is a U-42C and U-42D. They now are consolidated in to U-42A

Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish

NOTE: U-42A Trimming variation
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Shaun Kotlarsky

Size: 63mm X 85mm (2 ½ X 3 ⅜)

Variations: Click on the thumbnail above to see style variations

Variations: Tap on the thumbnail above to see style variations

To directly link to this image copy and paste below URL:

U-43
Manufacturer or Marking
No Name (Macomb? Dry Process) (USA)

Size: 53mm X 82mm (2 ⅛ X 3 ¼)
Example in Photo: No Name (Macomb? Dry Process) (USA)
Photo Credit: Elton Gish

To directly link to this image copy and paste below URL: