4B QD Bushed Sheaves Pulleys for “A” and “B” Belts

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. Depending on the pulley size, they are made to use with SH, SD, SK, SF, or E QD bushings, which we also stock. 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. All of them are balanced at the factory for smooth machinery operation. 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.

4B Style QD Bushed Pulley Size Chart

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

QD Bushed PulleysQD Bushed Pulleys are manufactured to exact tolerances. They are available with different diameters and can be statically balanced or dynamically balanced. These pulleys are manufactured from gray cast iron that ranges from GG 25 to GG 30. They have a strength of 207 Mpa and a hardness of 187 to 241.QD Bushings have full split flanges on one side and a straight flange around the outside diameter. The flange is a tight fit and requires a hex head cap screw to install the component. When tightening the screws, the flange compresses and draws the established part tight on the bushing.Why Choose Our QD Bushed Pulley?QD Bushed Pulleys offer numerous advantages over traditional V-Belt pulleys. They are more cost-effective and are well-suited for use with non-critical ratio drives. They feature a radially shaped cylindrical lining that reduces friction inside the hole and constricts the motion of mechanical parts. They work well in conjunction with hubs found in sprockets.

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.

FAQ

Q1. Are you a manufacturer or a trading company?A: We are a manufacturer and trading company.Q2. What is your sample policy?A: We can supply the sample if we have finished parts in stock, but customers need to pay for the sample cost and shipping fee.Q3. Can you produce according to the samples?A: We can produce power transmission parts according to your samples or technical drawings. We can build the molds and fixtures.Q4. Do you test all your goods before delivery?A: Yes, we have 100% test before delivery.Q5. Can you customize pulleys?A: Yes, please send us your drawing for an accurate quotation.Q6. How long is your delivery time and shipment?A: 1. Sample Lead-times: 10-20 days.2. Production Lead-times: 30-45 days after the order is confirmed.Q7. How do you make our business a long-term and good relationship?A: 1. We keep good quality and competitive price to ensure our customers' benefits ;2. We respect every customer as our friend and sincerely do business and make friends with them, no matter where they come from.Q8: What are your advantages?1. The most competitive price and good quality.2. Perfect technical engineers give you the best support.3. OEM is available.