ST-4500-4749 Modern compression caps 254mm - 298mm (10"

ST-4615

Size: 254mm (10")
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) // 79064 - 2C	Brown	USA

ST-4618

Size: 254mm (10")
Example in Photo: O-B (USA)
Photo Credit: Dustin Logan

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
O-B	(Sand-blast) (Number) (O-B Logo) (Number)	(Numbers)	Pumpkin Orange	USA

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:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
NGK	(Under-glaze Ink) (NGK Logo) (year) / Made In Japan	(Triangle Logo) 20 // 5K	Brown	Japan
O-B		O / (O-B Logo) // U.S. PAT / 1-25-10, 11-1-10 / 7-17-17 / 6792-38	Light Brown	USA
O-B		(O-B Logo)	Light Brown	USA

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:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
COOK		COOK / 600D	Brown	USA
CP	(Incuse) (CP Logo) 2500		Redish Brown	Canada
FIL	(Under-glaze Ink) FIL // (Year)	FIL // 1434	Brown	Italy
JD	(Under-glaze Ink) MFG (Date) / 3 5' / (JD Logo)	JD 1495 / (A in circle) 2	Redish Brown	USA
Lapp	(Under-glaze Ink) (Lapp Logo) LAPP / (Year)		Redish Brown	USA
Locke	(Incuse) LOCKE / (Year) / USA	LOCKE / 73325 (Keystone Logo) / MADE IN U.S.A. // 15,000 LBS.	Redish Brown	USA
Locke	(Incuse) LOCKE/15000 TEST/30000 M&E // (Date) / USA/ (Number)	(Number) / (Year) // (Numbers)	Dark Gray	USA
NGK	(Under-glaze Ink) 18000 Lbs. / (NGK Logo) / NGK / (Year) / Made In Japan	(Triangle Logo) 66 // 5F	Brown	Japan
O-B		(O-B Logo) / 1100LBS // 77276-17	Dark Brown	USA
O-B		(O-B Logo) / 15000LB // 79065-2	Redish Brown	USA
O-B		(O-B Logo) // 79065 - 2	Light Brown	USA
O-B	(Sand-blast) (Number) (O-B Logo) (Number)	(O-B Logo) / 11000LB // 2 77276 - 41	Dark Brown	USA
O-B	(Sand-blast) (Number) (O-B Logo) (Number)	(O-B Logo) / 15000LB // 1 79065 7	Pumpkin Orange	USA
O-B	(Sand-blast) (Number) (O-B Logo) (Number)	(O-B Logo) // (O-B Logo)	Pumpkin Orange	USA
O-B	(Sand-blast) (Number) (O-B Logo) (Number)	(Rusted, can not read markings)	Brown	USA
O-B	(Sand-blast) (Number) (O-B Logo) Number / 10000 TEST	US PAT 3024303 / (O-B Logo) /2 //90951-3	Brown	USA
O-B	(Under-glaze Ink) (O-B Logo)	(O-B Logo) / 15000LB // 79064-16	Redish Brown	USA
P.P. Inc.	(Incuse) (P.P. Inc. Logo) / (Year)	A15 // 3 / 15000 LB	Redish Brown	USA
Victor	(Incuse) (R= ∞ logo)	Z (in an oval)	Redish Brown	USA
Westinghouse	(Incuse) (Westinghouse Logo) / (Numbers)	(Westinghouse Logo)	Redish Brown	USA

ST-4625A

Size: 254mm (10")
Example in Photo: CP (Canada)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
CP	(Under-glaze Ink) CP (LOGO) 19xx (year marking)		Brown	Canada

ST-4625B

Size: 254mm (10")
Example in Photo: Lapp (USA)
Photo Credit: Bob Scafe
Note: Five petticoats.

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Lapp	(Sand-blast) 40000 LB. M&E / 20000 LB. TEST / LAPP (Year)	5P / CWP // L95	Cobalt	USA

ST-4626 (Fog Type)

Size: 254mm (10")
Example in Photo: LOCKE (USA)
Photo Credit: Alton FIx

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Locke	(Incuse) LOCKE / 20000 TEST / 10000 M&E // 43 84 / U.S.A. / T	2907 / 86 / 382	Cobalt	USA
Locke	(Incuse) LOCKE/ 20000 TEST/10000 M&E	290 / 86 / 962?	Cobalt	USA

ST-4626A

Size: 254mm (10")
Example in Photo: Allied Insulators (England)
Photo Credit: Gene Kingsley

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Unknown	(Under-glaze Ink) (Logo) / M&E BOKN / XP -LO / (Year)	(Logo) / 24838 // 5	Brown	England
Allied Insulators	(Under-glaze Ink) Number (Allied Insulators Logo) (Numbers) / ENGLAND / 12079 / 80 kN/H	Numbers / HF90 // 38200X	Gray	England
O-B	(Incuse) 75K TEST 8 OB 1264		Gray	USA

ST-4626B

Size: 254mm (10")
Example in Photo: NGK (Japan)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
NGK	(Under-glaze Ink) 36000LB/(NGK LOGO)/NGK/JAPAN/19xx (Year)		Dark Blue	Japan

ST-4626C

Size: 254mm (10")
Example in Photo: NGK (Japan)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
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 E5961M	Dark Gray	USA
Lapp	(Sand-blast) 36000 LB. M & E / 1800 LB. TEST / LAPP (YEAR) USA // LOT NO. 1	6 / LAPP / E60795M // 100 / M94 / 600 _ 04	Cobalt	USA
NGK	(Under-glaze Ink) 36000LB M-E/18000LB TEST/(NGK LOGO)/NGK/JAPAN/(year)	K36 98//15 4K/(LOGO)	Dark Blue	Japan

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

Size: 254mm (10")
Example in Photo: Pinco (USA)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Pinco	(Under-glaze Ink) IEEE/TEST	(Year)/PINCO	Light Blue	USA

ST-4626F

Size: 254mm (10")
Example in Photo: Locke (USA)
Photo Credit: Bob Scafe

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Locke	(Incuse) LOCKE / 10000 TEST / 20000 M&E	T (in a triangle) 04002 / 300281 // 725	Brown	USA

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:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Doulton	(Under-glaze Ink) 15000 LBS / (Doulton Logo)	NEMA / 15 M	Brown	England
NGK	(Under-glaze Ink) 18000 LB M&E / 9000 LB TEST / (NGK logo) / NGK / JAPAN / 72	2G // 39 // 7	Brown	Japan

ST-4635

Size: 254mm (10")
Example in Photo: Lapp (USA)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Lapp	(Under-glaze Ink) LAPP/(Year)/10,000 TEST	(Triangle) 84-03-001/TUPV/071281	White	USA

ST-4638

Size: 254mm (10")
Example in Photo: Richard Ginori (Italy)
Photo Credit: Christian Pagliacci

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Richard Ginori	(Under-glaze Ink) Richard Ginori	RG 2024 // (Year)	White	Italy

ST-4641

Size: 260mm (10.25")
Example in Photo: Verbano (Italy)
Photo Credit: Christian Pagliacci

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Verbano	(Under-glaze Ink) Verbano	V300	Dark Green	Italy

ST-4641A

Size: 260mm (10.25")
Example in Photo: Richard Ginori (Italy)
Photo Credit: Christian Pagliacci

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Richard Ginori	(Under-glaze Ink) Richard Ginori (Year)	RG // 2024	Brown	Italy

ST-4642

Size: 260mm (10.25")
Example in Photo: CP (Canada)
Photo Credit: Bob Scafe

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
CP		(CP Logo) / 25000 LB	Brown	Canada
CP	(Under-glaze Ink) (CP Logo) (Year)		Light Brown	Canada

ST-4643

Size: 260mm (10.25")
Example in Photo: Dulmison (England)
Photo Credit: Gene Kingsley

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Dulmison	(Under-glaze Ink)i 70KN / (Dulmison Logo) / Dulmison / DK100070 / (Date) / Number	(Logo) // 09 0115 / 070	Brown	England

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:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
CP	(Sand-blast) 6 (CP Logo) 0	1 CP // 25000	Dark Brown	Canada

ST-4645

Size: 266mm (10.5")
Example in Photo: Slavyansk Insulator Factory (Russia)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Slavyansk Insulator Factory	(Incuse) АИЗ / date / Numbers	(Johan Wilhelm Hofmann factory logo) / year // Numbers	Brown	Russia
Slavyansk Insulator Factory	(Incuse) АИЗ / date / Numbers	П-4,5 // ХЗ / date	Brown	Russia

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:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
O-B		92709P / (Year) // US PAT 3024303 / (O-B LOGO) / 36000LB	Cobalt	USA
O-B	(Sand-blast) (O-B Logo) / 48484 / 36,000 / (Year)	US PAT / 3024303	Cobalt	USA

ST-4648

Size: 273mm (10.75")
Example in Photo: Moscow Insulator factory (Russia)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Moscow Insulator factory	(Incuse) А2И (ГЭТ in diamond logo) (Date)		White	Russia
Slavyansk Insulator Factory	(Incuse) СДЕЛАНО В СССР / (Slavyansk logo) (Date) (Seal of Quality) / (Year) / ПФ70-В	ПФ70-II / (Year)	Brown	Russia

ST-4648A

Size: 273mm (10.75")
Example in Photo: Moscow Insulator factory (Russia)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Armset	(Incuse) (Date) / (Year)	(A in circle logo)	Pumpkin Orange	Russia
Moscow Insulator factory		∞	Green	Russia
Moscow Insulator factory	(Incuse) А2И (ГЭТ in diamond logo) (Date)		Brown	Russia
Moscow Insulator factory	(Under-glaze Ink)i [ A / (ВЭО in diamond logo) ] (Incuse) [ // M // 3К (backwards) ]		White	Russia

ST-4650

Size: 273mm (10.75")
Example in Photo: Doulton (England)
Photo Credit: Anonymous

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Doulton	(Under-glaze Ink) DOULTON/ENGLAND/2503/18 E.M./(Date)	HF/8320	White	England

ST-4705

Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Norden A/S	(Under-glaze Ink) (N logo) / Date		Green	Denmark
Rosenthal & Co.	(Under-glaze Ink) (RC logo) 227 / (Incuse) 5300 / 4V / (Year) / 98T	(Beehive Logo)	Brown	Germany

ST-4705A

Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Rosenthal & Co.		(Rosenthal Logo)	Green	Germany
Vereinigte Köppelsdorfer Porzellan-fabriken	(Sand-blast) (KP in diamond logo) / (Date) / K3	(KP in diamond logo) / Mt 193 // Shield emblem	Brown	Germany

ST-4705B

Size: 279mm (11")
Example in Photo: Rosenthal & Co. (Germany)
Photo Credit: George Sukhoff
Note: Extended inner skirt

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Rosenthal & Co.	(Under-glaze Ink) (Rosenthal logo) / Selb — Bayern	(RC Logo)	White	Germany

ST-4708

Size: 279mm (11")
Example in Photo: Doulton (England)
Photo Credit: Gene Kingsley

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Doulton	(Under-glaze Ink) MADE IN ENGLAND (Text in arc around Doulton logo) / Date / 10 E.M.		Brown	England

ST-4710

Size: 279mm (11")
Example in Photo: Taylor Tunnicliff & Co. (England)
Photo Credit: Gene Kingsly

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Taylor Tunnicliff & Co.	(Under-glaze Ink) (Star) (Taylor Tunnicliff & Co. LOGO) MADE IN/ENGLAND/ (Numbers)	CW / 32N (In a square) // 17590	Brown	England

ST-4715

Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Rosenthal & Co.	(Incuse) C / year / E /Numbers	(R C in a circle with a crown logo)	Green	Germany

ST-4715A

Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Rosenthal & Co.	(Incuse) (Year)	(RC Logo)	Brown	Germany

ST-4715B

Size: 292mm (11.5")
Example in Photo: Rosentlal & Co. (Germany)
Photo Credit: George Sukhoff

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
Rosenthal & Co.	(Incuse) (Year) / (Letter) / 400	(RC Logo)	Brown	Germany

ST-4720

Size: 297mm (11.5")
Example in Photo: J-D (USA)
Photo Credit: Mid Norris

Direct link to this insulator:

Manufacturer	Insulator Markings	Cap Markings	Color	Country
JD		(J-D LOGO)	Blue Gray	USA

ST-4500-4749

Modern compression caps 254mm - 298mm (10" - 11.75")