8B Gripbelt Sheaves with Split Taper Bushings for Use with All “A” and “B” Section Belts

8B series pulleys are manufactured for A, AX, AA, 4L, B, BX, BB, and 5L v-belts, ranging from 7.35" to 38.35" in diameter. Depending on the pulley size, they are made to use with Q2, R2, or S1 taper bushings, which we also stock. Most of our eight-groove 8B split taper bushed pulleys are manufactured from a high-strength grade 35 cast iron, are phosphate-coated, and are painted for anti-corrosion. All of them are balanced at the factory for smooth machinery operation.

8B Style Pulley Size Chart

Size	Bushing Type	Pitch Diameter (4L/A)	Pitch Diameter (5L/B)	Outside Diameter	Type	(O.L.)	(L)	(P)	(C)	(H)	(F)	(G)	(X)	(E)	Pulley Weight (LBS)
8B54Q	Q2	5.0"	5.4"	5.75"	5	7-9/32"	3-1/2"	3/4"	3-1/2"	4-1/8"	6-1/4"	--	2-3/4"	9/32"	18.1
8B56Q	Q2	5.2"	5.6"	5.95"	5	7-9/32"	3-1/2"	3/4"	3-1/2"	4-1/8"	6-1/4"	--	2-3/4"	9/32"	20.6
8B58Q	Q2	5.4"	5.8"	6.15"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	3/4"	2-3/4"	9/32"	20.9
8B60Q	Q2	5.6"	6.0"	6.35"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	3/4"	2-3/4"	9/32"	23.0
8B62Q	Q2	5.8"	6.2"	6.55"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	3/4"	2-3/4"	9/32"	23.0
8B64Q	Q2	6.0"	6.4"	6.75"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	7/8"	2-3/4"	9/32"	25.0
8B66Q	Q2	6.2"	6.6"	6.95"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	7/8"	2-3/4"	9/32"	27.3
8B68Q	Q2	6.4"	6.8"	7.15"	15	6-1/4"	3-1/2"	2"	3/4"	4-1/8"	6-1/4"	7/8"	2-3/4"	9/32"	31.1
8B70R	R2	6.6"	7.0"	7.35"	15	6-9/32"	4-7/8"	1/4"	3/4"	5-3/8"	6-1/4"	7/8"	4"	9/32"	29.5
8B74R	R2	7.0"	7.4"	7.75"	15	6-9/32"	4-7/8"	1/4"	3/4"	5-3/8"	6-1/4"	7/8"	4"	9/32"	34.9
8B80R	R2	7.6"	8.0"	8.35"	15	6-9/32"	4-7/8"	1/4"	3/4"	5-3/8"	6-1/4"	7/8"	4"	9/32"	42.9
8B86R	R2	8.2"	8.6"	8.95"	15	6-9/32"	4-7/8"	1/4"	3/4"	5-3/8"	6-1/4"	7/8"	4"	9/32"	52.0
8B90R	R2	8.6"	9.0"	9.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	48.3
8B94R	R2	9.0"	9.4"	9.75"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	49.3
8B110R	R2	10.6"	11.0"	11.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	55.0
8B124R	R2	12.0"	12.4"	12.75"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	60.0
8B136R	R2	13.2"	13.6"	13.95"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	68.5
8B154R	R2	15.0"	15.4"	15.75"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	77.3
8B184R	R2	18.0"	18.4"	18.75"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	90.0
8B200R	R2	19.5"	20.0"	20.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	96.0
8B250R	R2	24.5"	25.0"	25.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	129.0
8B300R	R2	29.5"	30.0"	30.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	163.0
8B300S	S1	29.5"	30.0"	30.35"	15	6-1/4"	4-7/8"	3/4"	1-1/8"	6-3/8"	6-1/4"	1-1/16"	3-5/16"	3/8"	168.0
8B380R	R2	37.5"	38.0"	38.35"	15	6-9/32"	4-7/8"	1/4"	1-1/8"	5-3/8"	6-1/4"	7/8"	4"	9/32"	228.0
8B380S	S1	37.5"	38.0"	38.35"	15	6-1/4"	4-7/8"	3/4"	1-1/8"	6-3/8"	6-1/4"	1-1/16"	3-5/16"	3/8"	238.0

Types of V-Belt Pulleys

Several types of pulleys are used in v-belt transmissions, each with a different implementation. Occasionally flat-belt pulleys are suitable when the back side of the v-belt is used to rotate the pulley in the opposite direction of the driven pulley, as commonly employed with ribbed v-belts.

• Standard pulleys have dimensions with one or multiple grooves, which mate with classic, small-engine, and hexagonal-style v-belts.
• Companion pulleys contain integral spokes which run radially on the pulley. This produces a high strength-to-weight ratio advantageous to fractional horsepower pulleys.
• Idler pulleys are used solely as belt tensioners in many v-belt drives but play an essential part in maintaining the tension required to drive the transmission. Idler pulleys reduce belt service life and the efficiency of the drive. Still, they are necessary for communications where the industry must clear obstructions, or the driven pulley does not maintain a good arc of contact with the v-belt to transmit torque. Idlers can interact with the wedged or flat side of the v-belt since no torque is required to be transferred to this axle.
• Variable speed pulleys have a variable pitch that adjusts the driven RPM, often within a range represented as a percentage. These pulleys are also helpful for maintaining belt tension for dynamic loads.
• Step pulleys have two or more non-adjustable grooves with different pitches around the same shaft. These pulleys change the speed ratio of the transmission.

How To Measure V-Belt Pulleys | Sizes & Dimensions

One of the ever-growing and most widely used product types in the power transmission and automotive industries is the V-belt pulley, also known as the “sheave.” A V-belt pulley is an attachment that transfers energy between axles with the help of a V-belt. However, to keep this critical pair of devices functioning correctly, one must secure the appropriate V-belt pulley replacement when an older one gets worn down. To do this, you need to know the size, dimensions, and type of your V-belt pulley so that the replacement will operate adequately. Learning to measure a V-belt pulley’s size and calculate its dimensions are simple tasks; however, correctly identifying a V-belt pulley type can be complex. V-belt pulleys come in various styles and options, including A-section, B-section, C-section, D-section, 3V-section, 5V-section, 8V-section, variable pitch, double groove, and metric pulleys. We stock over 8,000 different V-belt pulleys alone.

Technological Processing

Company Profile

Raydafon is a professional manufacturer of mechanical parts. Our main products are belt pulleys, sprockets, taper sleeves, coupling, and other transmission parts. Its products are mainly exported to Germany, Britain, France, and other European countries, with an annual export value of 18 million U.S. dollars, accounting for more than 65% of the total output. The annual output value reached 200 million yuan.Our products all adopt international, European, and American advanced industrial standards, use precise and good processing equipment, develop reasonable production technology, apply efficient and flexible management systems, and improve the quality management system to ensure that the product quality is good and the price is affordable.Our factory adheres to the enterprise concept of "quality: the basis of enterprise survival, integrity: the basis of enterprise development, service: the source of enterprise development, low price: the instrument of enterprise development." We are always looking forward to the presence of customers at home and abroad, seeking win-win benefits and joint cause development.

Warehouse Stock

The warehouse covers an area of 5000 square meters and can provide all kinds of standard models A/B/C/Z, with complete quantity and large quantity in stock. Meanwhile, it accepts all sorts of non-standard customization for drawing production. The daily production capacity is 10 tons, and the delivery time is short.

Packaging & Shipping

Experienced Workers Packing Pulleys Carefully, safe wooden cases keep parts from being injured or damaged during sea or air shipment.