Bijur B101 Flexible Extension Jet Assembly The Bijur B101 is a flexible extension jet assembly used for air-oil mist lubrication and cutting fluid delivery on machine tools. It combines a bendable 10-7/16″ (approximately 265mm) gooseneck tube with a B136 spray tip to direct a fine mist of oil or water-based coolant precisely at the cutting tool and workpiece contact zone. The assembly connects to the machine’s lubrication system fluid outlet (5/16-24 UNF thread) and a compressed air supply (1/8″ NPT thread). Compressed air passing through the jet body draws fluid from the fluid inlet by the Venturi effect and atomises it into a directed spray at the nozzle tip. The gooseneck tube can be bent and held in any position, allowing the spray to be aimed at the exact cutting point regardless of tool orientation or machine configuration. The B101 is the standard flexible jet on Bridgeport Series I and Series II knee mills and is widely used on manual and CNC vertical machining centres, lathes, and drilling machines that use Bijur Delimon mist lubrication systems. Technical Specifications Parameter Specification Part Number B101 Assembly Type Flexible extension jet (gooseneck) Overall Length 10-7/16″ (approximately 265mm) Spray Tip B136 (included) Air Inlet Thread 1/8″ NPT Fluid Inlet Thread 5/16″-24 UNF Body Material Die-cast zinc-aluminium alloy Compatible Fluids Water-based coolants, neat cutting oils, lubricating oils Fluid Delivery Adjustable — needle valve controls fluid flow rate Spray Pattern Directed mist (round pattern at B136 tip) Weight Approximately 0.20 lbs (90g) How the B101 Jet Works The B101 operates on the Venturi (air-aspirated) mist principle. Compressed air enters through the 1/8″ NPT air inlet port and passes through a narrow internal passage at high velocity. This creates a low-pressure zone at the fluid inlet port (5/16-24 UNF), drawing fluid up from the lubrication system reservoir by suction. The fluid meets the high-velocity air stream inside the jet body and is atomised into fine droplets that exit the B136 tip as a directed mist. The fluid flow rate is controlled by an internal needle valve — turning the adjustment screw changes the size of the fluid passage and therefore the volume of fluid entrained by the air stream. This allows the operator to set the mist concentration from a very light oil film for precision lubrication to a heavier coolant flow for aggressive cutting operations. The gooseneck tube between the body and the B136 tip is flexible — it can be bent by hand into any position and retains that position during operation. This is the key practical advantage of the B101 over stub jet assemblies (such as the B103): the flexible extension reaches around workholding fixtures, guards, and spindle housings to direct the spray precisely where it is needed without requiring the body to be repositioned. B101 vs B103 — Choosing the Right Jet Feature B101 (Flexible Extension) B103 (Stub Jet) Overall length 10-7/16″ (265mm) 1-7/16″ (36mm) Positioning Flexible gooseneck — bendable to any angle Fixed stub — mounts directly at the outlet port Thread connections 1/8″ NPT air / 5/16-24 fluid 1/8″ NPT air / 5/16-24 fluid Best for Applications where the cutting zone is not directly in front of the outlet port — standard fit on Bridgeport mills Compact installations where the outlet port is already positioned close to the cutting zone Typical Applications Bridgeport knee mills — the B101 is the original equipment jet on Bridgeport Series I and II mills; it is the correct replacement part for worn or damaged jets on these machines Manual vertical machining centres — general-purpose milling, drilling, and boring operations requiring directed coolant or oil mist at the cutting tool tip CNC vertical machining centres — secondary mist lubrication at the spindle for through-tool coolant systems that do not reach the tool flute contact zone Lathes and turning centres — oil mist delivery to the tool tip during turning, threading, and parting operations, particularly for dry-cut materials that benefit from light oil application rather than flood coolant Drilling machines — directed coolant mist at drill entry point for deep-hole drilling where chip clearance and tool cooling are critical Grinding operations — light oil mist application to grinding wheel contact zone on surface and cylindrical grinders Installation 1. Fluid connection — thread the 5/16-24 UNF fluid inlet into the corresponding outlet port on the Bijur lubrication pump or manifold. Apply a small amount of PTFE tape to the male thread. Tighten finger-tight plus one quarter turn — do not over-tighten the die-cast body. 2. Air connection — connect the 1/8″ NPT air inlet to the compressed air supply line. Recommended air supply pressure is 20–80 PSI depending on the desired mist volume and throw distance. Higher pressure produces finer atomisation and longer throw; lower pressure produces a wetter, heavier spray closer to the tip. 3. Positioning — bend the gooseneck to aim the B136 tip at the cutting zone. The tip should be 50–150mm from the tool-workpiece contact point for most milling and drilling operations. Ensure the gooseneck does not contact moving parts or the spindle housing. 4. Flow adjustment — start with the needle valve at mid-position. Run the machine at cutting speed and observe the mist pattern at the tool tip. Adjust the needle valve to increase or decrease fluid flow until the cutting zone shows consistent light wetting without pooling. Maintenance Flush the jet assembly with clean solvent or the same fluid used in the lubrication system at each scheduled maintenance interval — dried cutting oil or coolant residue inside the fluid passage reduces flow and causes uneven mist delivery Inspect the B136 tip for blockage or damage — a partially blocked tip produces an asymmetric spray pattern; replace the tip if cleaning does not restore a uniform round pattern Check the gooseneck for kinks or cracks — a kinked gooseneck restricts internal air and fluid flow; a cracked body will leak at operating pressure and should be replaced Verify the needle valve adjustment has not shifted — vibration from the machine spindle can cause gradual drift; re-check flow rate after any extended production run FAQ What is the Bijur B101 used for? The B101 is a flexible extension jet assembly for air-oil mist lubrication on machine tools. It uses compressed air to atomise oil or water-based coolant into a directed mist that is aimed at the cutting tool and workpiece contact zone to reduce friction, dissipate heat, and improve surface finish. It is the standard jet assembly on Bridgeport knee mills and is used on a wide range of manual and CNC machining centres, lathes, and drilling machines equipped with Bijur Delimon mist lubrication systems. What is the difference between the B101 and B103? The B101 has a 10-7/16″ flexible gooseneck extension that can be bent to position the B136 spray tip precisely at the cutting zone regardless of machine geometry. The B103 is a stub jet only 1-7/16″ long that mounts directly at the outlet port. Choose the B101 when the lubrication system outlet port is not already pointing at the cutting zone — which is the case on most knee mills and many machining centres. Choose the B103 only when the outlet port is already positioned directly adjacent to the cutting tool and no extension is needed. What air pressure should I use? Typical operating range is 20–80 PSI. Start at approximately 40 PSI and adjust based on the spray pattern observed at the cutting zone. Higher pressure (60–80 PSI) produces finer mist droplets with longer throw distance — appropriate for high-speed milling where the air stream needs to penetrate the cutting zone despite centrifugal forces from the rotating tool. Lower pressure (20–40 PSI) produces a wetter, heavier spray closer to the nozzle tip — suitable for slow-speed drilling or turning where a heavier oil film is preferred over a fine mist. Is the B101 a direct replacement for the original Bridgeport jet? Yes. The Isohitech B101 is manufactured to the same specification as the original Bijur Delimon B101 and is a direct replacement for the jet assembly on Bridgeport Series I and Series II knee mills. The 5/16-24 UNF fluid inlet and 1/8″ NPT air inlet are the standard Bijur connections used on these machines. The B136 tip is included with the assembly. Can the B101 be used with flood coolant systems? No. The B101 is an air-mist jet designed to deliver small volumes of fluid as an atomised spray — it is not a flood coolant nozzle. For high-flow flood coolant delivery, a dedicated coolant nozzle connected to a pump-driven coolant system is required. The B101 is appropriate for mist lubrication (MQL — minimum quantity lubrication) applications where a fine oil mist or light coolant mist is preferred over flood cooling. What fluids are compatible with the B101? The B101 is compatible with water-based cutting coolants, neat cutting oils, and general lubricating oils. The die-cast zinc-aluminium body is resistant to most standard cutting fluids. Do not use fluids containing strong acids, concentrated alkalis, or chlorinated solvents — these will corrode the zinc-aluminium alloy body. For applications using aggressive coolant formulations, contact us to confirm fluid compatibility before installation. Ordering information: the B101 is supplied as a complete assembly including the flexible extension and B136 tip. Contact us for EXW Nanjing unit pricing, available stock, and lead time. Related lubrication resources Oil lubrication pumps · Industrial oil pumps guide · Oil filtration guide
