8B QD Bushed Sheaves Pulleys for “A” and “B” Belts

8B series pulleys are manufactured for A, AX, AA, 4L, B, BX, BB, and 5L v-belts, ranging from 5.75" to 38.35" in diameter. Depending on the pulley size, they are made to use with SD, SK, SF, or E QD bushings, which we also stock. Most of our eight-groove 8B 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.

8B 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)
8B54SK	SK	A	5.4"	5.0"	5.75"	1-1/32"	6-1/4"	1-15/16"	3-9/32"	15.0
8B56SK	SK	A	5.6"	5.2"	5.95"	1-1/32"	6-1/4"	1-15/16"	3-9/32"	16.0
8B60SF	SF	A	6.0"	5.6"	6.35"	31/32"	6-1/4"	2-1/16"	3-7/32"	20.0
8B62SF	SF	A	6.4"	6.0"	6.75"	31/32"	6-1/4"	2-1/16"	3-7/32"	23.0
8B68SF	SF	A	6.8"	6.4"	7.15"	31/32"	6-1/4"	2-1/16"	3-7/32"	25.0
8B74SF	SF	A	7.4"	7.0"	7.75"	31/32"	6-1/4"	2-1/16"	3-7/32"	28.0
8B86E	E	A	8.6"	8.2"	8.95"	1-7/32"	6-1/4"	2-3/4"	2-9/32"	40.0
8B94E	E	A	9.4"	9.0"	9.75"	1-7/32"	6-1/4"	2-3/4"	2-9/32"	43.0
8B110E	E	A	11.0"	10.6"	11.35"	1-7/32"	6-1/4"	2-3/4"	2-9/32"	49.0
8B124E	E	A	12.4"	12.0"	12.75"	1-7/32"	6-1/4"	2-3/4"	2-9/32"	56.0
8B154E	E	A	15.4"	15.0"	15.75"	1-7/32"	6-1/4"	3-3/4"	2-9/32"	69.0
8B184F	F	D	18.4"	18.0"	18.75"	1/32"	6-1/4"	3-3/4"	2-17/32"	91.0
8B200F	F	D	20.0"	19.6"	20.35"	1/32"	6-1/4"	3-3/4"	2-17/32"	98.0
8B250F	F	D	25.0"	24.6"	25.35"	1/32"	6-1/4"	3-3/4"	2-17/32"	121.0
8B300F	F	D	30.0"	29.6"	30.35"	1/32"	6-1/4"	3-3/4"	2-17/32"	148.0
8B380F	F	D	38.0"	37.6"	38.35"	1/32"	6-1/4"	3-3/4	2-17/32"	194.0

Standard Mounting of QD Bushing

• Just ensure the tapered cone areas of the bushing and the inner part of the pulley are dirt free.
• Now mount QD bushing in pulley or QD product in alignment with clearance holes in product accompanied by threaded holes in the bushing.
• Place finger-tight lock washers and cap screws passing through the pull-up holes.
• Ensure that the bushing is fully expanded to ensure its sliding fit on the shaft. Now assemble the slide onto the shaft, providing the heads of caps crews are outside.
• Now place this assembly on the shaft for accurate drive alignment. Tighten the screw-over key with the help of an Allen wrench. Avoid any excessive force.
• It’s time to tighten up alternate cap screws and progressively to particular torque. A 1/8 to ¼ inch distance between these two segments is ideal to ensure the best cone grip and keep it press fit. Don’t allow the pulley to come in contact with the flange of the bushing.

Note: Once you have mounted the QD bushing, do not forget to fill the gap to avoid dirt.

Dismounting Process

• Remove the screws of the cap and place them into tapped holes in the pulley gradually and against the flange of the QD bushing until the grip of the bushing loosens out.
• Now loosen the set screw and take out the assembly from the shaft. You’re done with the dismounting process.

Note: The application of lubricants or any type of anti-seize elements or tapered cone surfaces, or even bolt threads, can harm pulleys. Avoid the such situation.

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.