ST-4750-4999 Modern compression caps 304mm (12") and greater

ST-4760

Size: 342mm (13.5”)
Example in Photo: O-B (USA)
Photo Credit: Mid Norris

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
O-B		(O-B Logo) // U.S. PAT'D / 1 - 25 -10 . 11 - 1 - 10 /7 - 17 - 17. / 8960 - 2	Brown	USA

ST-4775

Size: 355mm (14")
Example in Photo: CP (Canada)
Photo Credit: Bob Scafe

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
CP	(Incuse) (CP Logo) (Year) // (Letter and Numbers)	(CP Logo) / 20000 LBS	Sky Gray	Canada

ST-4870

Size: 381mm (15")
Example in Photo: NGK (Japan)
Photo Credit: Mid Norris

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
NGK	(Under-glaze Ink) 111KN M-E/56KN TEST/ (NGK LOGO)/NGK/JAPAN/01	59W/2128A // TK/25	Brown	Japan

ST-4875

Size: 387mm (15.75")
Example in Photo: NGK (Japan)
Photo Credit: Mid Norris

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
NGK	(Under-glaze Ink) 70KN/ (NGK LOGO)/NGK/JAPAN/(Year)			Japan

ST-4950

Direct link to this insulator:

Size: 431mm (17")
Example in Photo: NGK (Japan)
Photo Credit: Anonymous

Manufacturer	Insulator Markings	Cap Markings	Color	Country
NGK	(Under-glaze Ink) SAMPLE/ (NGK LOGO)/NGK/JAPAN/(Year)	K36	White	Japan

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