4B Series Cast Iron QD Pulleys | 4-Groove A/B V-Belt Sheaves

4B series pulleys are manufactured for A, AX, AA, 4L, B, BX, BB, and 5L v-belts, ranging from 3.75″ to 38.35″ in diameter. Most of our four-groove 4B QD bushed pulleys are manufactured from a high-strength grade 35 cast iron, are phosphate-coated, and are painted for anti-corrosion. The main benefit of using a QD (quick detachable) pulley is that if the bushing (hub) breaks, you don’t have to replace the whole assembly, or if just the pulley gets worn out, the same principle applies. The other significant benefit is that there is a broader range of bore options with QD pulleys than with the “fixed-bore” style.

Description

4B Series Cast Iron QD Pulleys (4-Groove A/B V-Belt Sheaves)

We precision-machine our 4B series four-groove QD (Quick Detachable) bushed pulleys for heavy-duty industrial power transmission drives. This series drives A (4L) and B (5L) classical V-belts—as well as AX, BX, AA, and BB profiles—and offers outside diameters from 3.75″ to 38.35″. Depending on the sheave diameter, these pulleys pair with standard SH, SD, SK, SF, or E QD bushings to deliver versatile shaft mounting and high torque transfer.

4B Series QD Bushed Pulley Technical Drawing

Key Features & Engineering Advantages

  • High-Strength Construction: We cast our four-groove 4B QD pulleys from Grade 35 high-tensile iron to ensure exceptional structural stability under severe loads.
  • Corrosion Protection: We treat each sheave with a phosphate conversion coating and apply a durable painted finish to resist corrosion in harsh environments.
  • Factory Dynamic Balance: We dynamically balance every pulley at the factory to minimize machinery vibration, optimize runout, and prolong bearing service life.
  • Flexible QD Bushing System: Quick Detachable bushings provide strong shaft-clamping force and flexible bore options. Replacing worn components individually minimizes equipment downtime and maintenance overhead.

4B QD Pulleys Dimensional Specifications

Size Bushing Type Pulley Type Pitch Diameter (5L/B) Pitch Diameter (4L/A) Outside Diameter (E) (F) (L) (M) Pulley Weight (LBS)
4B34SD SD E 3.4″ 3.0″ 3.75″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 5.5
4B36SD SD E 3.6″ 3.2″ 3.95″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 5.8
4B38SD SD E 3.8″ 3.4″ 4.15″ 2-15/32″ 3-1/4″ 1-13/16″ 1-1/32″ 6.2
4B40SD SD E 4.0″ 3.6″ 4.35″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 6.6
4B42SD SD E 4.2″ 3.8″ 4.55″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 6.9
4B44SD SD E 4.4″ 4.0″ 4.75″ 2-15/32″ 3-1/4″ 1-13/16″ 21/32″ 7.2
4B46SD SD A 4.6″ 4.2″ 4.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 7.6
4B48SD SD A 4.8″ 4.4″ 5.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.0
4B50SD SD A 5.0″ 4.6″ 5.35″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.4
4B52SD SD A 5.2″ 4.8″ 5.55″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 8.8
4B54SD SD A 5.4″ 5.4″ 5.75″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 9.2
4B56SD SD A 5.6″ 5.2″ 5.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 9.6
4B58SD SD A 5.8″ 5.4″ 6.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.0
4B60SD SD A 6.0″ 5.6″ 6.35″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.4
4B62SD SD A 6.2″ 5.8″ 6.55″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 10.8
4B64SD
SD A 6.4″ 6.0″ 6.75″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 12.0
4B66SD SD A 6.6″ 6.2″ 6.95″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 12.4
4B68SD SD A 6.8″ 6.4″ 7.15″ 21/32″ 3-1/4″ 1-13/16″ 25/32″ 13.0
4B70SK SK A 7.0″ 6.6″ 7.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 13.5
4B74SK SK A 7.4″ 7.0″ 7.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 14.0
4B80SK SK A 8.0″ 7.6″ 8.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 15.5
4B86SK SK A 8.6″ 8.2″ 8.95″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 17.0
4B94SK SK A 9.4″ 9.0″ 9.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 19.0
4B110SK SK A 11.0″ 10.6″ 11.35″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 22.0
4B124SK SK A 12.4″ 12.0″ 12.75″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 29.0
4B136SK SK A 13.6″ 13.2″ 13.95″ 7/32″ 3-1/4″ 1-15/16″ 1-3/32″ 34.0
4B154SF SF A 15.4″ 15.0″ 15.75″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 39.0
4B160SF SF A 16.0″ 15.6″ 16.35″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 42.0
4B184SF SF A 18.4″ 18.0″ 18.75″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 47.0
4B200SF SF A 20.0″ 19.6″ 20.35″ 5/32″ 3-1/4″ 2-1/16″ 1-1/32″ 51.0
4B250E E D 25.0″ 24.6″ 25.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 73.0
4B300E E D 30.0″ 29.6″ 30.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 86.0
4B380E E D 38.0″ 37.6″ 38.35″ 5/32″ 3-1/4″ 2-3/4″ 21/32″ 109.0
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Packing&Shipping & Delivery

china Packing Shipping Delivery

Packing Shipping Delivery

Chains package: First we will use carton package the chains--------then put in wooden box.
We also can custom color package according to your demand
Company Profile
Company Profile
FAQ

How to choose power transmissions parts and industrial products which meet our requirement

Chains Sprockets Pulleys Timing belt Pulley V-belt Pulley
Sheaves Coupings Bush &Hub Gear& Rack V-Belt
Locking Assembly Pulley Gearbox Reducer Shaft Collar
Rod End Bearing Clevis PTO Chain Guide Belt Guide
Rubber Buffer Chain Tensioner PTO Drive Shafts Universal Joints Roller Chains
Conveyor Chains V-Belts Worm Gearbox Helical Gear Worm
Agricultural Chain CNC Proces Parts Casting Stamping
Powder Metallurgy CNC Proces Parts Casting Stamping

What Products Do you sell ? 

We  are a group of factories, give customer one stop solution of power transmission and industrial products. We are in the position to supply wide range of products, including chains, sprockets, v-belt and v-belt pulleys, timing belt and timing belt pulleys, gears, speed reducers, motors, racks, couplings, and many other parts, like locking assembly, taper bushing, Chain guide, shaft collar, torque limiter, cam clutch, universal joint, motor base and motor slide, rod end, clevis, rubber mount, etc. We make special parts according to drawings and/or samples.

How to choose a gearbox which meets our requirement?
You can refer to our catalogue to choose the gearbox or we can help to choose when you provide
the technical information of required output torque, output speed and motor parameter etc.

What information shall we give before placing a purchase order?
a) Type of the gearbox, ratio, input and output type, input flange, mounting position, and motor informationetc.
b) Housing color.
c) Purchase quantity.
d) Other special requirements.

What industries are your gearboxes being used?
Our gearboxes are widely used in the areas of textile, food processing, beverage, chemical industry,
escalator,automatic storage equipment, metallurgy, tabacco, environmental protection, logistics and etc.

What is the producing process?

Production process including raw material cutting, machine processing, grinding, accessories cleaning, assemble, cleaning, stoving, oil coating, cover pressing, testing, package.

How to control the products quality?

Combining advanced equipment and strict management, we provide high standard and quality bearings for our customers all over the world.

What is the transportation?

-If small quantity , we Suggest to send by express, such as DHL,UPS, TNT FEDEX. If large amount, by air or sea shipping.

Can we design packaging?

-Yes. Default is regular packing, and we can make customer's own packing.

Can you provide OEM service?

-Yes, we work on OEM orders. Which means size, quantity, design, packing solution, etc will depend on your requests; and your logo will be customized on our products.

Can you give me discount on Power Transmissions Parts and Industrial parts?

-Yes, of course. Pls. send me your Email, you'll get more

Q: Are You a trading company or a manufacturer?

A: We Are the factory and have our Own trading company

Q: How Can I get an offer?

A: please send US quotation information: drawings, materials, weight, quantity and requirements, we can accept PDF, ISGS, DWG, STEP file format. If you don't have the drawings, please send us the samples, we can also quote you according to your samples.

Q: What is your minimum order size?

A: it is usually 100 pieces, but a low quantity is acceptable under some special circumstances.

Q: Do you provide samples? Is it free or extra?

A: Yes, we can provide samples free of charge, but we don't pay the freight.

Q: What is the lead time for mass production?

A: honestly, it depends on the number of orders. Normally, if you don't need the tools, deposit them after 30 days or so.

Q: What if the parts don't Work?

A: we can guarantee the quality, but if it happens, please contact us immediately, take some photos, we will check the problem and solve it as soon as possible.

Q: What are your terms of payment?

A: payment is less than US $1000,100% in advance. Payment: $1000,50% wire transfer in advance, balance before shipment,Other Terms of payment are negotiable