1 Groove BK Sheave

group name: BK series V-Belt Sheave

Min Order: 1 piece

brand name: CTS-ChinaTransmissionS

model: BK-1 Sheave

Nearest port for product export: Shanghai, Ningbo, Tianjing, Guangzhou

Delivery clauses under the trade mode: FOB, CFR, CIF, EXW

Acceptable payment methods: T/T, L/C, D/P D/A, MoneyGram, PayPal, Westem Union, Cash

update time: Sun, 28 Jun 2026 04:50:57 GMT

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Paramtents

Material Cast Iron
Belt Type B Section / 5L V-belts
Groove Quantity 1 Groove
Pilot Bore/ QD Bushed Black Phosphate/ Rust Protection
Bore Type Pilot Bore/ Finished Bore
Balance Dynamically Balanced

Packging & Delivery

Min Order1 piece

Briefing

High-strength cast iron BK-1 sheave for compact, high-speed industrial power transmission.

Detailed

About 1 Groove BK Sheave

A BK-1 Sheave is a single-groove classical V-belt sheave designed for use with B-section belts. In North American industrial markets, BK sheaves are commonly used in medium-duty industrial transmission systems requiring greater power transmission capacity than A-section belt drives.

Compared with AK sheaves, BK sheaves use wider B-section belts, allowing improved load capacity and better performance in industrial machinery operating under higher torque conditions. BK-1 sheaves are widely used in compressors, pumps, conveyors, agricultural machinery, and industrial processing equipment.

For more information or to request a quote on our BK-1 Sheave, please don't hesitate to contact us.

BK-1 Sheave Dimension

CTS can supply a complete range of BK-1 sheave sizes for different transmission requirements.

BK-1 Series Sheave Solid Web and Arm/Spoke Type

Part Number	Diameter			Type	Stock Finished Bores Includes Keyway and Setscrew											F	E	L Thru Bore	Weight Ib (Approx.)
Part Number	OD	Datum A(4L) Belts	Pitch 3L Belts	Type	Stock Finished Bores Includes Keyway and Setscrew											F	E	L Thru Bore	Weight Ib (Approx.)
BK23	2.3	-	2.1	A		0.625				1						0.8125	0.4063	1.0625	0.4
BK24	2.4	1.8	2.2	A	0.5	0.625	0.75	0.875								0.8125	0.4063	1.0625	0.4
BK25	2.5	1.9	2.3	A	0.5	0.625	0.75	0.875								0.8125	0.4063	1.0625	0.5
BK26	2.6	2	2.4	A	0.5	0.625	0.75	0.875								0.8125	0.4063	1.0625	0.6
BK27	2.7	2.1	2.5	B	0.5	0.625	0.75	0.875			1.125					0.8125	0.4063	1.0625	0.6
BK28	2.95	2.2	2.6	B	0.5	0.625	0.75	0.875		1	1.125					0.8125	0.4063	1.0625	0.8
BK30	3.15	2.4	2.8	B	0.5	0.625	0.75	0.875		1	1.125					0.8125	0.4063	1.0625	0.8
BK32	3.35	2.6	3	B	0.5	0.625	0.75	0.875		1						0.8125	0.4063	1.0625	0.8
BK34	3.55	2.8	3.2	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	1.3
BK36	3.75	3	3.4	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	1.5
BK40	3.95	3.2	3.6	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	1.5
BK45	4.25	3.5	3.9	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	1.8
BK46	4.35	3.6	4	B				0.875								0.875	0.4063	1.1563	18
BK47	4.45	3.7	4.1	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	1.8
BK48	4.55	3.8	4.2	B	0.5	0.625	0.75	0.875			1.125					0.875	0.4063	1.1563	2.0
BK50	4.75	4	4.4	B	0.5	0.625	0.75	0.875	0.9375	1	1.125					0.875	0.4063	1.1563	2.0
BK52	4.95	4.2	4.6	B	0.5	0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	2.0
BK55	5.25	4.5	4.9	B	0.5	0.625	0.75	0.875		1	1.125	1.1875				0.875	0.4063	1.1563	2.2
BK57	5.45	4.7	5.1	B		0.625	0.75	0.875	0.9375	1	1.125					0.875	0.4063	1.1563	2.3
BK60	5.75	5	5.4	B	0.5	0.625	0.75	0.875		1	1.125	1.1875				0.875	0.4063	1.1563	2.3
BK62	5.95	5.2	5.6	B	0.5	0.625	0.75	0.875	0.9375	1	1.125	1.1875				0.875	0.4063	1.1563	2.4
BK65	6.25	5.5	5.9	B		0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	2.7
BK67	6.45	5.7	6.1	C		0.625	0.75	0.875		1	1.125					0.875	0.4063	1.1563	2.8
BK70	6.75	6	6.4	C		0.625	0.75	0.875	0.9375	1	1.125	1.1875			1.4375	0.875	0.6563*	1.4688	3.3
BK72	6.95	6.2	6.6	C			0.75			1	1.125			1.375	1.4375	0.875	0.6563	1.4688	3.9
BK75	7.25	6.5	6.9	C			0.75			1	1.125				1.4375	0.875	0.6563	1.4688	3.9
BK77	7.45	6.7	7.1	C			0.75			1	1.125			1.375	1.4375	0.875	0.6563	1.4688	4.1
BK80	7.75	7	7.4	C		0.625	0.75	0.875		1	1.125	1.1875	1.25	1.375	1.4375	0.875	0.6563	1.4688	4.4
BK85	8.25	7.5	7.9	C			0.75			1	1.125	1.1875		1.375	1.4375	0.875	0.6563	1.4688	5.0
BK90	8.75	8	8.4	C			0.75	0.875	0.9375	1	1.125	1.1875		1.375	1.4375	0.875	0.6563	1.4688	5.0
BK95	9.25	8.5	8.9	C			0.75			1	1.125			1.375	1.4375	0.875	0.6563	1.4688	5.4
BK100	9.75	9	9.4	C			0.75	0.875		1	1.125	1.1875	1.25	1.375	1.4375	0.875	0.6563	1.4688	5.6
BK105	10.25	9.5	9.9	C						1				1.375	1.4375	0.875	0.6563	1.4688	5.8
BK110	10.75	10	10.4	C			0.75			1	1.125	1.1875		1.375	1.4375	0.875	0.6563	1.4688	6.4
BK115	11.25	10.5	10.9	C						1				1.375	1.4375	0.875	0.6563	1.4688	6.9
BK120	11.75	11	11.4	C			0.75			1		1.1875		1.375	1.4375	0.875	0.6563	1.4688	7.4
BK130	12.75	12	12.4	C			0.75	0.875		1	1.125	1.1875			1.4375	0.875	0.6563	1.4688	8.4
BK140	13.75	13	13.4	C			0.75			1		1.1875			1.4375	0.875	0.6563	1.4688	9.4
BK160	15.75	15	15.4	C						1	1.125	1.1875	1.25		1.4375	0.875	0.6563	1.4688	11.4
BK190	18.75	18	18.4	C						1		1.1875	1.25		1.4375	0.875	0.6563	1.4688	13.4

Additional sizes and customized dimensions are available according to customer requirements.

Bore & Mounting Options

CTS offers different bore configurations for various shaft installation systems.

Pilot Bore BK-1 Sheave

Suitable for customers requiring custom bore machining and keyway processing.

Finished Bore BK-1 Sheave

Supplied with finished bore and keyway for direct installation.