Description

Looking for a 6 bolt oil expeller machine manufacturer and supplier in Delhi, India? Our 6 bolt oil expeller sits in the sweet spot between our compact 4 bolt model and the heavy-duty 9 bolt unit, making it an excellent choice for medium-scale oil mills that need higher throughput than a small expeller can provide while still keeping capital investment and running costs at a manageable level. The six-bolt barrel clamping system offers stronger barrel retention than a four-bolt design, which allows higher pressing pressures and therefore higher oil extraction rates, particularly from hard or high-fibre oilseeds. Built at our Nangloi, Delhi factory, this machine is a workhorse for oil producers across India who demand reliability, efficiency, and value for money.

What is a 6 bolt oil expeller machine? A 6 bolt oil expeller is a medium-capacity screw press where the barrel housing is secured by six high-tensile bolts arranged in a pattern that distributes the clamping force evenly around the barrel circumference. This even clamping is important because as pressing pressure increases to extract more oil, the barrel must withstand greater internal forces without leaking oil through the joints between barrel segments. The six-bolt pattern provides that structural integrity while still allowing relatively straightforward disassembly for maintenance. The machine uses a single-screw design where seeds are fed into a hopper, compressed between the screw and barrel, and separated into oil and de-oiled cake continuously.

Key Features and Build Quality. The barrel is constructed from precision-machined alloy steel segments that are held in alignment by the six clamping bolts and located by dowel pins to prevent any shift under load. Each barrel segment has oil drainage slots that are laser-cut for consistency, ensuring uniform oil flow across the full pressing length. The screw is forged from high-carbon alloy steel and heat-treated to a Rockwell hardness of 58 to 62 HRC, giving it excellent wear resistance against abrasive seeds like copra and sunflower. The screw profile features three distinct zones: a feeding zone with wide pitch to draw seeds in, a compression zone where pitch reduces and pressure builds, and a discharge zone where maximum pressure is reached and the last traces of oil are squeezed out. A robust two-stage helical gearbox transmits power from the motor to the screw shaft, and the gearbox housing is made from cast iron for vibration dampening and structural rigidity. The machine is mounted on a fabricated steel base with anti-vibration pads that can be bolted to the factory floor for permanent installation or left freestanding for flexibility.

How does the 6 bolt oil expeller machine work? The operator loads cleaned and dried oilseeds into the hopper. The screw rotation draws seeds into the pressing chamber, and they begin their journey through the three zones. In the feeding zone, seeds are loosely packed and start to be caught between the screw flights and the barrel wall. Moving into the compression zone, the reducing pitch squeezes the seeds tighter, and oil begins to emerge through the drainage slots. By the time the material reaches the discharge zone, the seeds are compressed to their maximum, and the final oil is extracted. The oil flows down through the collection tray, passes through a mesh filter to remove fine particles, and collects in a vessel below. The cake, now in the form of hard, thin flakes, exits from the adjustable discharge nozzle. The operator can vary the nozzle opening to control the back pressure inside the barrel, which directly affects oil extraction efficiency and cake thickness. A larger opening reduces back pressure and produces thicker cake with slightly more residual oil. A smaller opening increases pressure and produces drier cake. Finding the optimal setting for each type of seed is part of the art of oil milling, and our machine gives you the adjustability to do that.

Technical Specifications. Processing capacity is 35 to 60 kilograms of oilseeds per hour depending on the seed type, moisture content, and desired cake dryness. The motor is 10 HP, three-phase, 415V, 50 Hz, with a belt and pulley drive system that allows speed adjustment within a range. The screw diameter is 70 mm with an effective pressing length of 550 mm. The barrel bore is 72 mm with six clamping bolts of M24 specification. The gearbox provides a reduction ratio of 18:1, giving a screw speed of approximately 28 to 35 RPM. The machine dimensions are approximately 1500 mm by 550 mm by 950 mm. Weight is about 420 kilograms. The oil collection area is covered by a removable stainless steel tray. An optional cake conveyor can be fitted to transport the de-oiled cake away from the discharge area and into bags or a storage pile automatically.

Applications and Industries. The 6 bolt oil expeller is widely deployed in medium-scale oil mills that process groundnut, sesame, mustard, sunflower, soybean, copra, and castor seeds. It serves oil producers who supply to packaging companies, cold-press oil brands that sell directly to consumers, oil extraction units at agricultural cooperative societies, and industrial oil producers who supply non-edible oils for soap making, lubricant manufacturing, and biofuel production. The machine is also used by government-supported rural entrepreneurship programs that set up oil mills in villages as part of self-employment schemes.

Benefits of Choosing Our 6 Bolt Oil Expeller. The higher pressing force that the six-bolt barrel can handle translates directly into better oil extraction rates, especially from stubborn seeds like copra that require high pressure to release their oil. The medium capacity range means you can process a meaningful volume of seeds per day, typically 300 to 500 kilograms in an eight-hour shift, which is enough to sustain a profitable oil mill operation. The machine is large enough to handle commercial volumes but compact enough to fit in a modestly sized facility. The gearbox is designed for continuous duty, so you can run the machine for full shifts without overheating. The adjustability of the discharge nozzle and the option to change screw profiles for different seeds give you operational flexibility that protects your investment as market demands shift.

Maintenance and Care. The gearbox oil should be changed after the initial 100-hour break-in period and then every 500 hours of operation. Inspect the screw and barrel segments every 150 hours and replace any segments showing visible wear or scoring. The six barrel bolts should be checked for proper torque before each pressing session and retightened as needed, typically requiring around 150 Newton-metres of torque. Clean the oil collection tray and filter mesh at the end of every working day. Lubricate the main shaft bearings every week with a lithium complex grease. If your machine is fitted with a belt drive, check the belt tension monthly and replace the belts if they show signs of cracking or glazing. Keep the hopper free of seed dust accumulation, and periodically check the magnetic separator for trapped metal fragments.

Frequently Asked Questions. What is the price of a 6 bolt oil expeller machine? Pricing depends on the motor specification, optional accessories, and any customisation you require. Call us for a detailed quote. How does it compare to the 4 bolt model? The 6 bolt model offers higher capacity, greater pressing force, and better oil extraction rates, making it suitable for operations that have outgrown the smaller unit. Can it press copra effectively? Yes, the higher barrel pressure capability makes it well-suited for copra, which is one of the hardest oilseeds to press efficiently. What kind of maintenance schedule should I follow? Daily cleaning, weekly bearing lubrication, monthly bolt and belt checks, and gearbox oil changes every 500 hours will keep the machine running smoothly.

Why Choose Our Delhi Factory and How to Order. We are a Delhi-based manufacturer with a fully equipped factory in Nangloi where we design, machine, assemble, and test every oil expeller before it leaves our premises. Our experience in building oil mill machinery means we understand the practical challenges you face, from seed variability to power fluctuations, and we build our machines to handle real Indian conditions. We offer pan-India delivery, installation assistance, and operator training. For a quotation or to schedule a factory visit, call us at +91 8588856870. Our team at the Nangloi factory is available to discuss your specific oilseed types and production targets to recommend the right configuration for your needs.