ST-4500-4749

Modern compression caps 254mm - 298mm (10" - 11.75")
ST-4615
ST-4615
ST-4615
Size: 254mm (10")
Example in Photo: O-B (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
O-B(O-B Logo) // 79064 - 2CBrownUSA
ST-4624
ST-4624
ST-4624
Size: 254mm (10")
Example in Photo: O-B (USA)
Photo Credit: Shaun Kotlarsky
Note: 1917 Austin patent for first compression style disc. Also note that the inner skirt is full sized. They had a problem with them getting damaged during installation and changed the design to have a shorter inner skirt. See ST-4625 for an example of the modified disc.
Patent: 974,177 - Patented November1, 1910
Patent:
1,233,296 - Patented July 17, 1917
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
NGK(Under-glaze Ink) (NGK Logo) (year) / Made In Japan(Triangle Logo) 20 // 5KBrownJapan
O-B O / (O-B Logo) // U.S. PAT / 1-25-10, 11-1-10 / 7-17-17 / 6792-38Light BrownUSA
O-B(O-B Logo)Light BrownUSA
ST-4625
ST-4625
ST-4625
Size: 254mm (10")
Example in Photo: O-B (USA)
Photo Credit: Alton FIx
Patent: 3,024,303 - Patent Mar. 6, 1962
Note: As with many disc insulators, this style was made over wide range of years. The above patent can be found on newer 1960s O-B disc. Also note that the inner skirt is shorter. ST-4624 was the original design. The inner skirt was getting damaged during installation so the shorten the inner skirt.
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
COOKCOOK / 600DBrownUSA
CP(Incuse) (CP Logo) 2500Redish BrownCanada
FIL(Under-glaze Ink) FIL // (Year)FIL // 1434BrownItaly
JD(Under-glaze Ink) MFG (Date) / 3 5' / (JD Logo)JD 1495 / (A in circle) 2Redish BrownUSA
Lapp(Under-glaze Ink) (Lapp Logo) LAPP / (Year)Redish BrownUSA
Locke(Incuse) LOCKE / (Year) / USALOCKE / 73325 (Keystone Logo) / MADE IN U.S.A. // 15,000 LBS.Redish BrownUSA
Locke(Incuse) LOCKE/15000 TEST/30000 M&E // (Date) / USA/ (Number)(Number) / (Year) // (Numbers)Dark GrayUSA
NGK(Under-glaze Ink) 18000 Lbs. / (NGK Logo) / NGK / (Year) / Made In Japan(Triangle Logo) 66 // 5FBrownJapan
O-B(O-B Logo) / 1100LBS // 77276-17Dark BrownUSA
O-B(O-B Logo) / 15000LB // 79065-2Redish BrownUSA
O-B(O-B Logo) // 79065 - 2Light BrownUSA
O-B(Sand-blast) (Number) (O-B Logo) (Number)(O-B Logo) / 11000LB // 2 77276 - 41Dark BrownUSA
O-B(Sand-blast) (Number) (O-B Logo) (Number)(O-B Logo) / 15000LB // 1 79065 7Pumpkin OrangeUSA
O-B(Sand-blast) (Number) (O-B Logo) (Number)(O-B Logo) // (O-B Logo)Pumpkin OrangeUSA
O-B(Sand-blast) (Number) (O-B Logo) (Number)(Rusted, can not read markings)BrownUSA
O-B(Sand-blast) (Number) (O-B Logo) Number / 10000 TESTUS PAT 3024303 / (O-B Logo) /2 //90951-3BrownUSA
O-B(Under-glaze Ink) (O-B Logo)(O-B Logo) / 15000LB // 79064-16Redish BrownUSA
P.P. Inc.(Incuse) (P.P. Inc. Logo) / (Year)A15 // 3 / 15000 LBRedish BrownUSA
Victor(Incuse) (R= ∞ logo)Z (in an oval)Redish BrownUSA
Westinghouse(Incuse) (Westinghouse Logo) / (Numbers)(Westinghouse Logo)Redish BrownUSA
ST-4625A
ST-4625A
ST-4625A
Size: 254mm (10")
Example in Photo: CP (Canada)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
CP(Under-glaze Ink) CP (LOGO) 19xx (year marking)BrownCanada
ST-4625B
St-4625B
ST-4625B
Size: 254mm (10")
Example in Photo: Lapp (USA)
Photo Credit: Bob Scafe
Note: Five petticoats.
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Sand-blast) 40000 LB. M&E / 20000 LB. TEST / LAPP (Year)5P / CWP // L95CobaltUSA
ST-4626 (Fog Type)
ST-4626
ST-4626
Size: 254mm (10")
Example in Photo: LOCKE (USA)
Photo Credit: Alton FIx
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Locke(Incuse) LOCKE / 20000 TEST / 10000 M&E // 43 84 / U.S.A. / T2907 / 86 / 382CobaltUSA
Locke(Incuse) LOCKE/ 20000 TEST/10000 M&E290 / 86 / 962?CobaltUSA
ST-4626A
ST-4626A
ST-4626A
Size: 254mm (10")
Example in Photo: Allied Insulators (England)
Photo Credit: Gene Kingsley
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Unknown(Under-glaze Ink) (Logo) / M&E BOKN / XP -LO / (Year)(Logo) / 24838 // 5BrownEngland
Allied Insulators(Under-glaze Ink) Number (Allied Insulators Logo) (Numbers) / ENGLAND / 12079 / 80 kN/HNumbers / HF90 // 38200XGrayEngland
O-B(Incuse) 75K TEST 8 OB 1264GrayUSA
ST-4626B
ST-4626B
ST-4626B
Size: 254mm (10")
Example in Photo: NGK (Japan)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
NGK(Under-glaze Ink) 36000LB/(NGK LOGO)/NGK/JAPAN/19xx (Year)Dark BlueJapan
ST-4626C
ST-4626C
ST-4626C
Size: 254mm (10")
Example in Photo: NGK (Japan)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Sand-blast) 30000 LB. M&E/15000 LB. TEST/LAPP (Year) USA // (Over-glaze Ink) (MFG Date)04/ <><>/P/65 45 12 /07/11/04/8 // LAPP E5961MDark GrayUSA
Lapp(Sand-blast) 36000 LB. M & E / 1800 LB. TEST / LAPP (YEAR) USA // LOT NO. 16 / LAPP / E60795M // 100 / M94 / 600 _ 04CobaltUSA
NGK(Under-glaze Ink) 36000LB M-E/18000LB TEST/(NGK LOGO)/NGK/JAPAN/(year)K36 98//15 4K/(LOGO)Dark BlueJapan
ST-4626D
Note: This unit is now known as ST-4647, as it is a 10.5 inch unit and not a 10.
ST-4626E
ST-4626E
ST-4626E
Size: 254mm (10")
Example in Photo: Pinco (USA)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Pinco(Under-glaze Ink) IEEE/TEST(Year)/PINCOLight BlueUSA
ST-4626F
ST-4626F
ST-4626F
Size: 254mm (10")
Example in Photo: Locke (USA)
Photo Credit: Bob Scafe
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Locke(Incuse) LOCKE / 10000 TEST / 20000 M&E T (in a triangle) 04002 / 300281 // 725BrownUSA
ST-4626G
ST-4626G
ST-4626G
Size: 254mm (10")
Example in Photo: Doulton (England)
Photo Credit: Bob Scafe
Note: Length of inner skirt may very
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Doulton(Under-glaze Ink) 15000 LBS / (Doulton Logo)NEMA / 15 MBrownEngland
NGK(Under-glaze Ink) 18000 LB M&E / 9000 LB TEST / (NGK logo) / NGK / JAPAN / 72 2G // 39 // 7 BrownJapan
ST-4635
ST-4635
ST-4635
Size: 254mm (10")
Example in Photo: Lapp (USA)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Under-glaze Ink) LAPP/(Year)/10,000 TEST(Triangle) 84-03-001/TUPV/071281WhiteUSA
ST-4638
ST-4638
ST-4638
Size: 254mm (10")
Example in Photo: Richard Ginori (Italy)
Photo Credit: Christian Pagliacci
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Richard Ginori(Under-glaze Ink) Richard GinoriRG 2024 // (Year)WhiteItaly
ST-4641
ST-4641
ST-4641
Size: 260mm (10.25")
Example in Photo: Verbano (Italy)
Photo Credit: Christian Pagliacci
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Verbano(Under-glaze Ink) VerbanoV300Dark GreenItaly
ST-4641A
ST-4641A
ST-4641A
Size: 260mm (10.25")
Example in Photo: Richard Ginori (Italy)
Photo Credit: Christian Pagliacci
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Richard Ginori(Under-glaze Ink) Richard Ginori (Year)RG // 2024BrownItaly
ST-4642
ST-4642
ST-4642
Size: 260mm (10.25")
Example in Photo: CP (Canada)
Photo Credit: Bob Scafe
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
CP(CP Logo) / 25000 LBBrownCanada
CP(Under-glaze Ink) (CP Logo) (Year)Light BrownCanada
ST-4643
ST-4643
ST-4643
Size: 260mm (10.25")
Example in Photo: Dulmison (England)
Photo Credit: Gene Kingsley
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Dulmison(Under-glaze Ink)i 70KN / (Dulmison Logo) / Dulmison / DK100070 / (Date) / Number(Logo) // 09 0115 / 070BrownEngland
ST-4643A
ST-4643A
ST-4643A
Size: 260mm (10.25")
Example in Photo: CP (Canada)
Photo Credit: Bob Scafe
Note: No inner skirt like on ST-4643
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
CP(Sand-blast) 6 (CP Logo) 01 CP // 25000Dark BrownCanada
ST-4645
ST-4645
ST-4645
Size: 266mm (10.5")
Example in Photo: Slavyansk Insulator Factory (Russia)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Slavyansk Insulator Factory(Incuse) АИЗ / date / Numbers(Johan Wilhelm Hofmann factory logo) / year // NumbersBrownRussia
Slavyansk Insulator Factory(Incuse) АИЗ / date / NumbersП-4,5 // ХЗ / dateBrownRussia
ST-4647
ST-4647
ST-4647
Size: 266mm (10.5")
Example in Photo: O-B (USA)
Photo Credit: Jeff Markwart
Patent: 3,024,303 - Patent Mar. 6, 1962
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
O-B92709P / (Year) // US PAT 3024303 / (O-B LOGO) / 36000LBCobaltUSA
O-B(Sand-blast) (O-B Logo) / 48484 / 36,000 / (Year)US PAT / 3024303CobaltUSA
ST-4648
ST-4648
ST-4648
Size: 273mm (10.75")
Example in Photo: Moscow Insulator factory (Russia)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Moscow Insulator factory(Incuse) А2И (ГЭТ in diamond logo) (Date)WhiteRussia
Slavyansk Insulator Factory(Incuse) СДЕЛАНО В СССР / (Slavyansk logo) (Date) (Seal of Quality) / (Year) / ПФ70-ВПФ70-II / (Year)BrownRussia
ST-4648A
ST-4648A
ST-4648A
Size: 273mm (10.75")
Example in Photo: Moscow Insulator factory (Russia)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Armset(Incuse) (Date) / (Year)(A in circle logo)Pumpkin OrangeRussia
Moscow Insulator factoryGreenRussia
Moscow Insulator factory(Incuse) А2И (ГЭТ in diamond logo) (Date)BrownRussia
Moscow Insulator factory(Under-glaze Ink)i [ A / (ВЭО in diamond logo) ] (Incuse) [ // M // 3К (backwards) ]WhiteRussia
ST-4650
ST-4650
ST-4650
Size: 273mm (10.75")
Example in Photo: Doulton (England)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Doulton(Under-glaze Ink) DOULTON/ENGLAND/2503/18 E.M./(Date)HF/8320WhiteEngland
ST-4705
ST-4705
ST-4705
Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Norden A/S(Under-glaze Ink) (N logo) / DateGreenDenmark
Rosenthal & Co.(Under-glaze Ink) (RC logo) 227 / (Incuse) 5300 / 4V / (Year) / 98T(Beehive Logo)BrownGermany
ST-4705A
ST-4705A
ST-4705A
Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Rosenthal & Co.(Rosenthal Logo)GreenGermany
Vereinigte Köppelsdorfer Porzellan-fabriken(Sand-blast) (KP in diamond logo) / (Date) / K3(KP in diamond logo) / Mt 193 // Shield emblemBrownGermany
ST-4705B
ST-4705B
ST-4705B
Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff
Note: Extended inner skirt
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Rosenthal & Co.(Under-glaze Ink) (Rosenthal logo) / Selb — Bayern(RC Logo)WhiteGermany
ST-4708
ST-4708
ST-4708
Size: 279mm (11")
Example in Photo: Doulton (England)
Photo Credit: Gene Kingsley
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Doulton(Under-glaze Ink) MADE IN ENGLAND (Text in arc around Doulton logo) / Date / 10 E.M.BrownEngland
ST-4710
ST-4710
ST-4710
Size: 279mm (11")
Example in Photo: Taylor Tunnicliff & Co. (England)
Photo Credit: Gene Kingsly
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Taylor Tunnicliff & Co.(Under-glaze Ink) (Star) (Taylor Tunnicliff & Co. LOGO) MADE IN/ENGLAND/ (Numbers)CW / 32N (In a square) // 17590BrownEngland
ST-4715
ST-4715
ST-4715
Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Rosenthal & Co.(Incuse) C / year / E /Numbers(R C in a circle with a crown logo)GreenGermany
ST-4715A
ST-4715A
ST-4715A
Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Rosenthal & Co.(Incuse) (Year)(RC Logo)BrownGermany
ST-4715B
ST-4715B
ST-4715B
Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Rosenthal & Co.(Incuse) (Year) / (Letter) / 400(RC Logo)BrownGermany
ST-4720
ST-4720
ST-4720
Size: 297mm (11.5")
Example in Photo: J-D (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
JD(J-D LOGO)Blue GrayUSA