U-228-274

(Side tie styles with no extended skirt, most are also signal styles)
U-228
Manufacturer or Marking
No Name (USA)
Size: 60mm X 95mm (2 x 3 ¾)
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-228A
Manufacturer or Marking
No Name (USA)
U-228A
Size: 82mm X 104mm (3 ¼ x 4 )
Example in Photo: No Name (USA)
Photo Credit: Mid Norris
To directly link to this image copy and paste below URL:
U-228B
Manufacturer or Marking
No Name (USA)
U-228B
Size: 82mm X 114mm (3 ¼ x 4 ½)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-229
Manufacturer or Marking
No Name (USA)
G (USA)
U-229
Size: 73mm X 101mm (2 x 4)
Example in Photo: No Name (G)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-229A
Manufacturer or Marking
No Name (G, Dry Process) (USA)
U-229A
Size: 79mm X 104mm (3 x 4 )
Example in Photo: No Name (G, Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-230
Manufacturer or Marking
No Name (Pittsburg, MLOD) (USA)
U-230
Size: 76mm X 92mm (3 x 3 )
Example in Photo: No Name (Pittsburg, MLOD) (USA)
Photo Credit: Larry Baumann
To directly link to this image copy and paste below URL:
U-231
Manufacturer or Marking
No Name (Pittsburg) (USA)

NOTE: In 2008 and older reference books, there was a U-232. All listings are now part of U-231 as they are the same style.
U-231
Size: 69mm X 85mm (2 ¾ x 3 )
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Jim Frustier
To directly link to this image copy and paste below URL:
U-234
Manufacturer or Marking
No Name (USA)
No Name (G.P.Co.) (USA)
No Name (Lima) (USA)
No Name (New Lexington) (USA)
No Name (Pittsburg) (USA)
HVIC (Pittsburg) (USA)
U-234
Size: 73mm X 85mm (2 x 3 ⅜)
Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-236
Manufacturer or Marking
No Name (USA)
G (Dry Process)(USA)
U-236
Size: 73mm X 85mm (2 x 3 ⅜)
Example in Photo: G (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-236A
Manufacturer or Marking
No Name (Dry Process, Emb circle in pinhole (USA)
U-236A
Size: 73mm X 85mm (2 x 3 ⅜)
Example in Photo: No Name (Dry Process, Emb circle in pinhole (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-237
Manufacturer or Marking
No Name (USA)
No Name (Similar composition to brick) (USA)
U-237
Size: 73mm X 88mm (2 x 3 ½)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-238
Manufacturer or Marking
No Name (USA)

NOTE: In 2008 and older reference books, there was a U-238A listed. Listings are now part of U-238. U-238A is now for what use to be U-238B
U-238
Size: 76mm X 82mm (3 x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Jim Frustier
To directly link to this image copy and paste below URL:
U-238A
Manufacturer or Marking
No Name (USA)
No Nam (Thomas) (USA)
No Name (G.P.Co.) (USA)
G (USA)
G.P.Co. (USA)

NOTE: In 2008 and older reference books, this was listed as U-238B. It moved to U-238A as the old listing for U-238A was removed because it was just a trimming variation of the U-238.
U-238A
Size: 76mm X 92mm (3 x 3 ⅝)
Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-239
Manufacturer or Marking
No Name (Dry process, Mold Line to upper ridge) (USA)
No Name (Thomas) (Dry Process) (USA)
THOMAS (Dry Process) (USA)
U-239
Size: 76mm X 85mm (3 x 3 ⅜)
Example in Photo: No Name (Dry process, Mold Line to upper ridge) (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-239A
Manufacturer or Marking
No Name (USA)
THOMAS (USA)
U-239A
Size: 76mm X 88mm (3 x 3 ½)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-239B
Manufacturer or Marking
MACOMB (Dry Process) (USA)
U-239B
Size: 76mm X 82mm (3 x 3 ¼)
Example in Photo: MACOMB (Dry Process) (USA)
Photo Credit: Elton Gish
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U-239C
Manufacturer or Marking
No Name (Flat inner skirt, Dry process) (USA)
No Name (Dry Process) (USA)
U-239C
Size: 79mm X 92mm (3 x 3 )
Example in Photo: No Name (Flat inner skirt, Dry process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-239D
Manufacturer or Marking
No Name (USA)

NOTE: Dry Process
U-239D
Size: 79mm X 85mm (3 x 3 ⅜)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-240
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (Dry Process) (USA)
U-240
Size: 76mm X 88mm (3 x 3 ½)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-241
Manufacturer or Marking
No Name (USA)

NOTE: In 2008 and older reference books, this was U-240A. All U-240A listings are now part of U-241.
U-241
Size: 79mm X 79mm (3 x 3 ⅛)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-241A
Manufacturer or Marking
No Name (Pittsburg) (USA)
JOHNS-MANVILLE (Pittsburg) (USA)

NOTE: In 2008 and older reference books, there was a U-241C. All listings are now part of U-241A.
U-241A
Size: 79mm X 85mm (3 x 3 ⅜)
Example in Photo: JOHNS-MANVILLE (Pittsburg) (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-241B
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-241B
Size: 79mm X 85mm (3 x 3 ⅜)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-242
Manufacturer or Marking
No Name (Fred Locke or Lima) (USA)
No Name (Locke) (USA)
No Name (Thomas) (USA)
Fred Locke (USA)
Triangle M (USA)

NOTE: in 2008 and older reference books, there was a U-242A listed, all listings are now part of U-242
U-242
Size: 82mm X 85mm (3 ¼ x 3 ⅜)
Example in Photo: Fred Locke (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-243
Manufacturer or Marking
No Name (Lima) (USA)
No Name (Pittsburg) (USA)
Illinois (USA)
Triangle M (USA)
U-243
Size: 82mm X 92mm (3 ¼ x 3 ⅝)
Example in Photo: No Name (Pittsburg)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-244
Manufacturer or Marking
No Name (Macomb, Dry Process) (USA)
MACOMB (Dry Process) (USA)
U-244
Size: 79mm X 92mm (3 x 3 ⅝)
Example in Photo: MACOMB (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-244A
Manufacturer or Marking
MACOMB (Dry Process) (USA)
U-244A
Size: 79mm X 92mm (3 x 3 ⅝)
Example in Photo: MACOMB (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-244B
Manufacturer or Marking
MACOMB (Dry Process) (USA)
U-244B
Size: 82mm X 101mm (3 ¼ x 4)
Example in Photo: MACOMB (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-246
Manufacturer or Marking
No Name (Pittsburg) (USA)

NOTE: In 2008 and older reference books, there was a U-231A listed. Listing are now part of U-246.
Size: 82mm X 101mm (3 ¼ x 4")
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-246A
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-246A
Size: 82mm X 95mm (3 ¼ x 3 ¾“)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-247
Manufacturer or Marking
No Name (Lima) (USA)
No Name (Pittsburg) (USA)
Illinois (USA)
O-B (USA)
Triangle M (USA)
U-247
Size: 82mm X 98mm (3 ¼ x 3 ⅞)
Example in Photo: O-B (USA)
Photo Credit: Bill Ostrander
To directly link to this image copy and paste below URL:
U-248
Manufacturer or Marking
No Name (USA)
No Name (Dry Process) (USA)
No Name (Dry Process, Davidson & Stevenson, MLOD)
D-2 (On Skirt Edge, Dry Process) (USA)
G (Dry Process) (USA)
U-248
Size: 82mm X 104mm (3 ¼ x 4 ⅛)
Example in Photo: No Name (Dry Process, Davidson & Stevenson, MLOD)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-248A
Manufacturer or Marking
No Name (Dry Process, Threadles, Fred Locke Attic Dig) (USA)

NOTE: This is a Dry Process threadless insulator not made by Fred Locke but found at the Fred Locke addict dig.
U-248A
Size: 53mm X 63mm (2 x 2 ½)
Example in Photo: No Name (Dry Process, Threadles, Fred Locke Attic Dig) (USA)
Photo Credit: Ken Willick
To directly link to this image copy and paste below URL:
U-249
Manufacturer or Marking
No Name (USA)
COOK (1301) (USA)
Westinghouse (USA)
U-249
Size: 82mm X 101mm (3 ¼ x 4)
Example in Photo: COOK (1301) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-250
Manufacturer or Marking
No Name (USA)
No Name (Lima?) (USA)
U-250
Size: 82mm X 107mm (3 ¼ x 4 ¼)
Example in Photo: No Name (Lima?) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-252
Manufacturer or Marking
No Name (New Lexington 17) (USA)
U-252
Size: 79mm X 66mm (3 x 2 ⅝)
Example in Photo: No Name (New Lexington 17) (USA)
Photo Credit: James Mulvey
To directly link to this image copy and paste below URL:
U-255
Manufacturer or Marking
No Name (USA)
No Name (Thomas) (USA)
U-255
Size: 79mm X 82mm (3 x 3 ¼)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-256
Manufacturer or Marking
No Name (Triangle M) (USA)
Locke (USA)
Triangle M (USA)
U-256
Size: 82mm X 76mm (3 ¼ x 3)
Example in Photo: No Name (Triangle M) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-256A
Manufacturer or Marking
No Name (Triangle M) (USA)
Locke (USA)
Triangle M (USA)
U-256A
Size: 82mm X 76mm (3 ¼ x 3)
Example in Photo: No Name (Triangle M) (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-256B
Manufacturer or Marking
No Name (Thomas, Dry Process) (USA)
U-256B
Size: 82mm X 79mm (3 ¼ x 3 ⅛)
Example in Photo: No Name (Thomas, Dry Process) (USA)
Photo Credit: Rick Soller
To directly link to this image copy and paste below URL:
U-257
Manufacturer or Marking
No Name (USA)
No Name (O-B) (USA)
Illinois (USA)
O-B (USA)

NOTE: In 2008 and older U-257 as the U-257A was just a trimming variation.
U-257
Size: 82mm X 73mm (3 ¼ x 2 ⅞)
Example in Photo: No Name (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-258
Manufacturer or Marking
No Name (USA)
U-258
Size: 82mm X 79mm (3 ¼ x 3 ⅛)
Example in Photo: No Name (USA)
Photo Credit: Clint Gaylord
To directly link to this image copy and paste below URL:
U-259
Manufacturer or Marking
No Name (Fred Locke) (USA)
Fred Locke (USA)

NOTE: In 2008 and older reference books, there was a U-259A listed. Listing are now part of U-259.
U-259
Size: 82mm X 76mm (3 ¼ x 3)
Example in Photo: Fred Locke (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-260
Manufacturer or Marking
No Name (USA)
No Name (Illinois) (USA)
U-260
Size: 79mm X 76mm (3 x 3)
Example in Photo: No Name
Photo Credit: National Insulator association
To directly link to this image copy and paste below URL:
U-265
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-265
Size: 76mm X 88mm (3 x 3 ½)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Shaun Kotlarsky
To directly link to this image copy and paste below URL:
U-265A
Manufacturer or Marking
No Name (USA)
No Name (Dry Process) (USA)
Size: 76mm X 88mm (3 x 3 ½)
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-265B
Manufacturer or Marking
G.P.Co (USA)
No Name (G.P.Co) (USA)
U-265B
Size: 82mm X 92mm (3 ¼ x 3 ⅝)
Example in Photo: G.P.Co (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-266
Manufacturer or Marking
No Name (Triangle M) (USA)
No Name (MLOD) (USA)
No Name (USA)
G.P.Co. (USA)
Triangle M (USA)
U-266
Size: 79mm X 95mm (3 x 3 ¾)
Example in Photo: No Name (Triangle M) (USA)
Photo Credit: Bill Vincent
To directly link to this image copy and paste below URL:
U-266A
Manufacturer or Marking
No Name (USA)
U-266A
Size: 82mm X 95mm (3 ¼ x 3 ¾)
Example in Photo: No Name (USA)
Photo Credit: Dave Kingston
To directly link to this image copy and paste below URL:
U-267
Manufacturer or Marking
No Name (USA)
No Name (Pittsburg) (USA)
No Name (Thomas, Dry Process) (USA)
Triangle M (USA)


NOTE: in 2008 and older reference books, There was a U-267A . All listing are now part of U-267
U-267
Size: 82mm X 95mm (3 ¼ x 3 ¾)
Example in Photo: No Name (Thomas, Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-267A
Manufacturer or Marking
No Name (USA)
No Name (Pittsburg) (USA)
No Name (Thomas, Dry Process) (USA)
Triangle M (USA)

NOTE: in 2008 and older reference books, There was a U-267B . All listing are now part of the new U-267A. Old U-267A is now part of U-267 Also note, that the dome is wider on the U-267A VS the 267
U-267A
Size: 85mm X 95mm (3 x 3 ¾)
Example in Photo: No Name (Thomas, Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-268
Manufacturer or Marking
No Name (Triangle M) (USA)
Size: 82mm X 101mm (3 ¼ x 4)
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-268A
Manufacturer or Marking
No Name (New Lexington, Flat inner skirt)
No Name (USA)
U-268A
Size: 82mm X 101mm (3 ¼ x 4)
Example in Photo: No Name (USA)
Photo Credit: Fred Collier
To directly link to this image copy and paste below URL:
U-268B
Manufacturer or Marking
No Name (New Lexington, Flat inner skirt)

NOTE: Similar to U-279, but with out extended skirt
U-268B
Size: 79mm X 95mm (3 x 3 ¾)
Example in Photo: No Name (New Lexington, Flat inner skirt)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-269
Manufacturer or Marking
No Name (Dry Process) (USA)
No Name (USA)

NOTE: In 2008 and older reference books. There was a U-271. The listing for Dry Process 271s are now part of U-269
U-269
Size: 85mm X 104mm (3 x 4 ⅛)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-269A
Manufacturer or Marking
No Name (Dry Process) (USA)

NOTE: In 2008 and older reference books, this was listed as U-269B. The old listing for U-269A was removed and the old U-269B moved to U-269A. Also old U-269A listings are now part of U-272
U-269A
Size: 82mm X 98mm (3 ¼ x 3 )
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-270
Manufacturer or Marking
No Name (USA)
Size: 82mm X 101mm (3 ¼ x 4)
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-270A
Manufacturer or Marking
No Name (USA)
U-270A
Size: 80mm X 101mm (3 3/16 x 4)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-272
Manufacturer or Marking
No Name (Pittsburg) (USA)
No Name (USA)
No Name (New Lexington) (USA)
G (USA)
Triangle M (USA)

Note: In 2008 and older reference books, there was a U-273 listed. It is just a variation on the U-272 so it has been deleted. Also Old U-269A listings are part of U-272 now
Size: 82mm X 101mm (3 ¼ x 4)
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-274
Manufacturer or Marking
No Name (O. P. Co., Dry Process) (USA)
O.P.Co. (Dry Process) (USA)
U-274
Size: 82mm X 107mm (3 ¼ x 4 ¼
Example in Photo: O.P.Co. (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-274A
Manufacturer or Marking
No Name (New Lexington) (USA)
No Name (USA)
U-274A
Size: 82mm X 114mm (3 ¼ x 4 ½)
Example in Photo: No Name (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-274B
Manufacturer or Marking
No Name (Dry Process) (USA)
U-274B
Size: 82mm X 107mm (3 ¼ x 4 ¼)
Example in Photo: No Name (Dry Process) (USA)
Photo Credit: Elton Gish
To directly link to this image copy and paste below URL:
U-274C
Manufacturer or Marking
No Name (USA)
U-274C
Size: 85mm X 111mm (3 x 4 )
Example in Photo: No Name (USA)
Photo Credit: Bill Rohde
To directly link to this image copy and paste below URL: