Triple-passage flange mount rotary joint for pneumatic and light fluid applications. Compact design, PTFE composite seal, AL6061 body. Ships in 7 days.
BP-3P-0004 is a triple-passage flange mount rotary joint designed for multi-function pneumatic and light fluid applications. The PTFE composite seal provides low friction torque and chemical resistance across air, water, oil, and coolant media. The AL6061 body at 0.45 kg is among the lightest 3-passage joints in its class, making it ideal for compact rotary tables and packaging machinery.
| Model Number | BP-3P-0004 |
|---|---|
| Number of Passages | 3-in-3-out (triple passage) |
| Mount Type | Flange Mount |
| Max Pressure | 1 MPa (10 bar / 145 psi) — derate to 0.7 MPa for continuous water or coolant duty |
| Max Speed | 200 RPM — derate to 150 RPM for continuous water or coolant |
| Body Material | AL6061 Aluminum Alloy |
| Seal Type | PTFE Composite Seal with FKM O-ring backup |
| Compatible Media | Air, Water, Oil, Coolant, Light Hydraulic Oil (ISO VG 32 max) |
| Operating Temperature | -20°C to +80°C |
| Net Weight | Approx. 0.45 kg |
| Certifications | ISO 9001:2015, CE, RoHS |
| Warranty | 12 Months |
AL6061 aluminum body: 6061-T6 aluminum alloy with yield strength 276 MPa and excellent corrosion resistance when anodized. At 0.45 kg, this is among the lightest 3-passage rotary joints available, making it ideal for compact rotary tables and packaging machinery where weight and envelope size matter. Anodizing thickness is 15–25 microns for corrosion protection in water and coolant environments. Not recommended for abrasive coolant or high-impact environments without additional protective coating.
PTFE composite seal: Polytetrafluoroethylene with glass fiber and graphite filler. Self-lubricating, chemically inert, and rated for -200°C to +260°C. The composite structure provides structural integrity while maintaining the low friction coefficient (0.05–0.10 against steel) that makes PTFE ideal for rotary seals. FKM O-ring provides static sealing at the housing interface. One seal compound handles all compatible media, simplifying spare parts inventory.
When to choose flange mount: For rigid stationary mounting on machine frames and rotary tables. The flange mount distributes load over a larger area than threaded mounts, providing better resistance to vibration and side loads. If your application requires frequent removal or has limited flange machining access, consider the threaded-mount BP-3P-0006 or BP-3P-0007.
BP-3P-0004 is designed for multi-function pneumatic and light fluid applications where three independent channels are required in a compact, lightweight package. This model may be suitable for the listed applications when its passage count, mounting, medium, pressure, speed, and temperature limits match the machine requirements.
Proper installation extends seal life from 6 months to 12+ months. The most common cause of early failure on flange-mounted joints is uneven bolt tightening, which distorts the AL6061 flange face and creates a leak path. Follow these steps for reliable operation.
Confirm your equipment's flange dimensions and bolt pattern match the rotary joint flange specification. The P.C.D. must align within 0.1 mm to prevent flange distortion under pressure. Download the 2D drawing for exact dimensions, hole sizes, depths, and tolerances. Custom bolt patterns are available with 10-day lead time. If your mating flange is steel or cast iron, check for burrs that could score the AL6061 face.
Place the gasket between the flange faces. Tighten bolts evenly in a cross (star) pattern to the specified torque. For M6 bolts: 6–8 N·m. For M8 bolts: 12–15 N·m. Overtightening warps the AL6061 flange face, creating a leak path within days. Undertightening allows the gasket to extrude under 1 MPa pressure. Use a torque wrench — "hand tight" is not precise enough for a 0.45 kg aluminum flange.
BP-3P-0004 includes an anti-rotation tab on the stationary housing. Secure it to a fixed bracket with an M6 bolt torqued to 6–8 N·m. Never let the body rotate freely with the shaft — the supply hoses will twist and the seal will experience reverse torque, accelerating wear. The anti-rotation bracket must have >3 mm clearance from rotating parts.
Use flexible hoses (not rigid pipe) to connect the stationary side to the air supply. Rigid pipe transfers vibration and thermal expansion directly to the joint, stressing the seal. Install a 40-micron filter upstream to protect the PTFE seal from debris. For water or coolant, add a Y-strainer (60 mesh) to prevent particulate damage. Label each hose to match the corresponding passage number.
Run at low pressure (0.2 MPa) and low speed (50–100 RPM) for 5 minutes without load. This beds the PTFE seal against the shaft surface, creating a micro-smooth contact zone. Check all three seal interfaces for leaks. If dry, gradually increase to operating pressure and speed over 10 minutes. Skipping the run-in is the #2 cause of early seal failure — the seal needs time to conform to the shaft surface finish.
Full dimensions, tolerances, flange bolt pattern, P.C.D., shaft finish requirements, and seal groove details. 120 KB.
Free 3D files provided after inquiry. Includes exact flange geometry, bolt hole patterns, and port orientations. Use for CAD fit verification before ordering.
Complete guide: flange mounting, torque specs, anti-rotation, filtration, run-in procedure, and maintenance checklist. 650 KB.
AL6061 material traceability, hardness test report, and RoHS compliance certificate. Available upon request with order.
Not sure if BP-3P-0004 is the right model? Use this comparison to decide — and know exactly when to upgrade to a multi-passage, higher-pressure, or dust-proof joint.
| Your Requirement | BP-3P-0004 Fit | Better Alternative | Why Upgrade |
|---|---|---|---|
| Single air line, handheld tool, weight critical | ❌ Overkill — 0.45 kg, 3 passages | BP-1P-0003 | 0.08 kg aluminum, single passage, lower cost |
| Dual air lines, 1 MPa, general automation | ⚠️ Fewer passages needed | BP-2P-0001 | Same flange mount, 1 MPa, lower cost |
| Triple air lines, 1 MPa, ≤200 RPM, flange mount | ✅ Perfect | — | — |
| Pressure >1.0 MPa (e.g., 1.5 MPa hydraulic) | ❌ Over pressure | BP-2P-0002 | 1.5 MPa rated, threaded mount, dual passage |
| 4+ independent passages needed | ❌ Too few passages | BP-8P-0001 | 8 passages with independent seals, flange mount |
| Dusty or abrasive environment (steel mill, foundry) | ❌ No dust protection | BP-2P-50-0001 | Dust-proof seal and protective shroud |
| Food-grade or medical cleanroom | ❌ Standard FKM not FDA | Custom FDA-grade | FDA 21 CFR 177.2600 compliant FKM or EPDM seal |
The #1 cause of BP-3P-0004 warranty claims is overtightening flange bolts. A technician torques M8 bolts to 25 N·m instead of the specified 12–15 N·m. Incorrect installation or operation outside the specified limits can cause premature leakage. Failure timing depends on alignment, medium, pressure, speed, temperature, and duty cycle. The technician blames the seal quality and requests a replacement — but the root cause was installation torque. Rule: Use a torque wrench. Tighten in a star pattern. M6: 6–8 N·m. M8: 12–15 N·m. Check flange flatness with a feeler gauge.
A machine builder needs 1.2 MPa hydraulic oil for a compact rotary table. To save $20, they buy BP-3P-0004 (1 MPa rated) and run it at 1.2 MPa. Over-pressure can damage or extrude the seal and may cause cross-port or external leakage. Failure timing depends on the actual pressure, medium, temperature, speed, and duty cycle. Oil leakage can contaminate the work area and cause unplanned downtime. The actual impact depends on the machine layout, leak rate, and maintenance response. Rule: Respect the 1 MPa limit. For 1.5 MPa, use BP-2P-0002. For 5 MPa, use BP-2P-130-0001. The $20 savings cost $300 in downtime and cleanup.
A maintenance team installs BP-3P-0004 on a packaging machine and immediately runs it at 0.8 MPa and 150 RPM. The PTFE seal has not bedded into the shaft surface — microscopic high spots create leak paths. Within 2 weeks, vacuum drops from -0.07 MPa to -0.04 MPa, and labels fall off. The team replaces the seal, but the same thing happens again because they skip the run-in every time. Rule: Run at 0.2 MPa and 50–100 RPM for 5 minutes before full operation. This beds the seal and extends life from 6 months to 12+ months.
Other rotary joints commonly purchased with BP-3P-0004 — or the models you upgrade to when your application outgrows three passages.
The standard BP-3P-0004 uses a full AL6061 aluminum body for light weight and good corrosion resistance. The 0.45 kg mass is among the lightest in the 3-passage category. For full steel construction (heavier but higher rigidity) or special surface treatments, contact our engineering team. All versions are manufactured under ISO 9001:2015 quality management and carry CE and RoHS certifications. Material certificates with full traceability are available upon request with every order.
Yes — the PTFE composite seal and FKM O-ring are compatible with water, water-soluble coolant, and light hydraulic oil up to ISO VG 32. For continuous water duty, derate pressure to 0.7 MPa and speed to 150 RPM to reduce seal wear. The AL6061 body is anodized for corrosion resistance, making it suitable for intermittent water and coolant exposure. For continuous water immersion or deionized water, specify a nickel-plated or stainless steel (304/316) version. Always use a 40-micron filter for water duty to protect the seal from particulate damage.
BP-3P-0004 uses a standard flange mount with bolt holes on a defined P.C.D. Download the 2D PDF drawing for exact bolt circle diameters, hole sizes, depths, and tolerances. Ensure your equipment mating flange matches within 0.1 mm flatness before ordering. Custom bolt patterns are available with a 10-day lead time. The flange gasket material is included with every order. For high-vibration environments, specify lock washers or thread-locking compound to prevent bolt loosening.
Yes — free 3D STEP and IGES files are provided after you send an inquiry. The file includes exact flange geometry, bolt hole patterns, port orientations, and the 0.45 kg AL6061 body envelope. Use the 3D file to verify clearance, P.C.D. alignment, and hose routing in your CAD assembly before ordering. 3D files may be provided for qualified projects after the application requirements are reviewed. File availability and response time depend on the model and the project information provided. Custom configuration file timing depends on the project review.
Upgrade when your application exceeds the 1 MPa pressure limit, 200 RPM speed limit, or 3-passage capacity. Common triggers: (1) Your pressure requirement rises above 1.0 MPa — BP-2P-0002 handles 1.5 MPa, BP-2P-130-0001 handles 5 MPa. (2) You need rotation above 200 RPM — contact us for a custom high-speed seal design. (3) You need 4 or more independent channels — BP-8P-0001 provides 8 passages. (4) Your environment becomes dusty or abrasive — BP-2P-50-0001 has dust-proof protection. The upgrade cost is typically $20–$70 more than BP-3P-0004, but it prevents the cost of scrapped parts from seal failure.
We design custom rotary joints for any number of passages, pressure, thread type, and mounting style. Free 3D STEP file with every inquiry. Typical custom lead time: 10–14 days.
Request Custom Design →Technical Note: All pressure ratings, speed ratings, and material specifications referenced on this page are based on Begapunk BP-series standard pneumatic rotary joints tested under controlled laboratory conditions. Actual performance depends on operating conditions, media quality, installation practices, and maintenance schedule. For applications outside standard ratings — including high-pressure hydraulic above 1 MPa, continuous water immersion, food-grade, or cleanroom environments — consult Begapunk factory engineering before specification. Last updated: June 11, 2026.