ST-4000-4249

Modern compression caps 152mm (6") and under
ST-4075
ST-4075
ST-4075
Size: 76mm (3")
Example in Photo: No Name (USA)
Photo Credit: Mid Norris
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ManufacturerInsulator MarkingsCap MarkingsColorCountry
UnknownP577GrayUSA
ST-4077
ST-4077
ST-4077
Size: 76mm (3")
Example in Photo: O-B (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
O-BUS PAT 3,024,303 // (OB LOGO)Dark GrayUSA
ST-4100
ST-4100
ST-4100
Size: 88 (3.5")
Example in Photo: LAPP (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Under-glaze Ink) LAPP 7500LB TEST7500LB / TESTGrayUSA
ST-4101
ST-4101
ST-4101
Size: 95mm (3.75")
Catalog Info: Lapp 1970-No. 7527
Catalog source: Elton Gish
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ManufacturerInsulator MarkingsCap MarkingsColorCountry
LappN/A (Drawing)USA
ST-4110
ST-4110
ST-4110
Size: 88mm (3.5")
Example in Photo: LOCKE (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Locke(Incuse) LOCKE / (Date)LOCKE / 36181Redish BrownUSA
ST-4120
ST-4120
ST-4120
Size: 101 (4")
Example in Photo: LAPP (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Lapp(Under-glaze Ink) LAPP (Year) 30000 LBS . M&E 15000 LB . TESTLAPP / E-2302M // 65 45 12 / 0 / (Date)GrayUSA
ST-4130
ST-4130
ST-4130
Size: 107 (425”)
Example in Photo: FIL (Italy)
Photo Credit: Tracy Schaff
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
FILFIL // M 253Light BrownItaly
ST-4165
ST-4165
ST-4165
Size: 152mm (6")
Example in Photo: Locke (USA)
Photo Credit: Mid Norris
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Locke(Incuse) LOCKE / (Date)LOCKE / 74480 // (keystone logo)Redish BrownUSA
ST-4168
ST-4168
ST-4168
Size: 152mm (6")
Example in Photo: NGK (Japan)
Photo Credit: Bob Scafe
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
NGK(Under-glaze Ink) 10000 LB / (NGK Logo) / NGK / (Year) / JAPAN1 40 // 0 // 3 20Sky GrayJapan
ST-4170
ST-4170
ST-4170
Size: 152mm (6")
Example in Photo: CP (Canada)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
CPCP/15000LBBrownCanada
CP(Under-glaze Ink) CP (LOGO)BrownCanada
No Name (CP)BrownCanada
ST-4172
ST-4172
ST-4172
Size: 152mm (6”)
Example in Photo: THOMAS (USA)
Photo Credit: Evan Petak
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Thomas(Incuse) THOMAS (Number)5996 - Thomas -10000-LBSBrownUSA
ST-4175
ST-4175
ST-4175
Size: 152mm (6")
Example in Photo: Victor (USA)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
CP(Sand-blast) 19 (CP LOGO) XX (Year)/10.000LB(CP LOGO)BrownCanada
ITE(Incuse) ITE/YearBTC/VICTOR/10000LBS/71070CobaltUSA
JD(Under-glaze Ink) MFG. (Date) // (J-D Logo)unknownBrownUSA
Lapp(LAPP Logo) LAPP / 6605 / (Year)Pumpkin OrangeUSA
Locke(Incuse) 24 76 / USALOCKE / 7-480 // 02B / 5000 / TESTRedish BrownUSA
Locke(Incuse) LOCKE / (Year) / USALocke 10000 LB. 71480 MADE IN USARedish BrownUSA
P.P. Inc.(Incuse) (PP Logo)(PP / INC Logo) // (Year)Redish BrownUSA
Pinco(on Hook) 4083// PINCOBrownUSA
Santana(Under-glaze Ink) Santana/month & Year - BRASIL//TEST- 5.000lb/M&E-10.000lbSantana/50 KN..40-04-013/Symbol)/191283GrayBrazil
Victor(Incuse) (VICTOR LOGO)/YearBTC/VICTOR/10000LBS/71070Dark BlueUSA
ST-4176
ST-4176
ST-4176
Size: 152mm (6")
Example in Photo: O-B (USA)
Photo Credit: Anonymous
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Line Material(Sand-blast) (Year) / (LM Logo) / 12,000 LB (Under-glaze Ink) (3 digit number)3886BrownUSA
O-BLS / 5000 (O-B Logo) TEST / 10000LB 99 / 83123 / 150078-3001 (Bell) 10 K 7 75GrayUSA
O-B(Sand-blast) (Number) (O-B Logo) (Number)(O-B Logo) / 10000LB // 82123 - 15Pumpkin OrangeUSA
Westinghouse(Incuse) (Westinghouse logo) / (Year)Redish BrownUSA
ST-4177
ST-4177
ST-4177
Size: 152mm (6")
Example in Photo: Westinghouse (USA)
Photo Credit: Paul Greaves
Direct link to this insulator:
ManufacturerInsulator MarkingsCap MarkingsColorCountry
Westinghouse(Under-glaze Ink) (Westinghouse Logo) / (number)(Westinghouse Logo) // 550655 >< (Hook) 550654 (Westinghouse Logo) // (B in a shield) 6495BrownUSA