Quad-passage flange-mounted rotary joint with Ø30mm hollow bore for pneumatic and fluid transfer applications. AL6061 aluminum alloy body, PTFE + Si3N4 ceramic seal. Ships in 7 days. Used on multi-station rotary tables, cable-through systems, welding positioners, and packaging machinery where a central through-bore eliminates external cable drag chains and simplifies machine design.
BP-4P-30-0001 is a quad-passage hollow-bore rotary joint designed for multi-function rotary tables and cable-through systems. The Ø30mm central bore allows cables, shafts, or tubing to pass through the rotation center. The PTFE + Si3N4 ceramic seal combines the self-lubricating properties of PTFE with the extreme hardness of silicon nitride, making it ideal for abrasive coolant and hard-water environments. The AL6061 body is hard-anodized for corrosion resistance and thread durability.
| Model Number | BP-4P-30-0001 |
|---|---|
| Number of Passages | 4-in-4-out (quad passage, Ø30mm hollow bore) |
| Mount Type | Flange Mount |
| Max Pressure | 1 MPa (10 bar / 145 psi) |
| Max Speed | 80 RPM |
| Body Material | AL6061 Aluminum Alloy |
| Seal Type | PTFE Composite + Si3N4 Ceramic Seal |
| Compatible Media | Air, Water, Coolant, Hydraulic Oil |
| Operating Temperature | -20°C to +80°C |
| Net Weight | Approx. 0.943 kg |
| Certifications | ISO 9001:2015, CE, RoHS |
| Warranty | 12 Months |
AL6061 Aluminum Alloy body: T6 temper with yield strength 276 MPa and hardness 95 HB. The hard-anodized surface (25–30 μm thickness) creates a ceramic-like layer that resists wear from hose vibration and protects against corrosion from coolant mist. At 0.943 kg, the body is rigid enough for flange mounting on steel machine frames without flexing under 1 MPa internal pressure. For applications with heavy side loads or impact, a 45# steel shaft insert is available as a custom option.
PTFE + Si3N4 ceramic seal: The PTFE matrix provides self-lubrication and chemical inertness, while the silicon nitride (Si3N4) ceramic filler adds extreme hardness (>1500 HV) and thermal stability. This combination is specifically chosen for abrasive media — metal-particle coolant, hard water with calcium scale, or contaminated hydraulic oil — where a pure PTFE seal would wear rapidly. The ceramic particles act as micro-bearings, reducing friction and preventing seal groove scoring.
When to specify pure PTFE instead: If your media is clean air or filtered water with no abrasive particles, the standard PTFE composite seal (without Si3N4) is sufficient and lower cost. The Si3N4 option adds 5–7 days lead time and is recommended only for abrasive or high-wear environments. Contact Begapunk engineering if you are unsure about media abrasiveness.
BP-4P-30-0001 is designed for applications that need 4 independent air or fluid channels plus a central through-bore for cables or shafts. The Ø30mm bore is large enough for multiple cables, a small drive shaft, or a vacuum hose bundle. 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 of BP-4P-30-0001 requires careful alignment of the Ø30mm hollow bore with your central shaft or cable bundle. The most common failure mode is eccentric mounting, which creates a wobble that overloads the seal and bearing. Follow these steps for reliable operation.
Confirm your equipment flange has bolt holes matching the BP-4P-30-0001 flange pattern and that the central shaft or cable bundle is concentric within ±0.1 mm. Download the 2D PDF for exact P.C.D., hole diameter, flange thickness, and bore runout tolerance. Excessive eccentricity can create cyclic side load on the seal and increase leakage risk. Confirm the allowable alignment tolerance for the selected model. Use a dial indicator to check concentricity before final tightening.
Secure the flange using screws with spring washers. Torque to 4–5 N·m for M5 flange bolts. Overtightening warps the flange face, reducing the seal housing clearance and causing binding. After tightening, rotate the joint by hand — it should turn smoothly with <0.15 N·m resistance. If it feels notchy, loosen and recheck alignment. Verify that cables or shafts in the Ø30mm bore do not rub against the bore wall during rotation.
If your model includes an anti-rotation tab, secure it to a fixed bracket with an M3 screw. Never let the body rotate freely with the shaft. Free rotation twists the 4 pneumatic hoses into a helix, creating torsional stress that loosens fittings and kinks tubing. The anti-rotation tab must be rigid — a loose zip-tie is not sufficient. Use a metal bracket bolted to the machine frame.
Use flexible polyurethane or nylon hoses (6×4 mm or 8×5 mm) to connect the 4 passages. Rigid pipe is not allowed — it transfers vibration and thermal expansion directly to the joint, stressing the Si3N4 seal. Install a 40-micron filter upstream of each passage to protect the seal from debris. For coolant or water, add a Y-strainer (60 mesh) to prevent particulate damage. Label each hose at both ends to avoid cross-connection during maintenance.
Run at low pressure (0.2 MPa) and low speed (20 RPM) for 5 minutes without load. This beds the PTFE + Si3N4 seal against the shaft surface and distributes lubricant evenly across the ceramic particles. Check all 4 passages for leaks with soapy water. If dry, gradually increase to operating pressure and speed over 10 minutes. Skipping the run-in is the #2 cause of early seal failure in abrasive media — the ceramic particles need time to align with the shaft surface finish.
Full dimensions, tolerances, flange bolt pattern, Ø30mm bore geometry, thread specs, and seal groove details. 120 KB.
Free 3D files provided after inquiry. Includes flange mount pattern, Ø30mm bore clearance envelope, port positions, and anti-rotation tab geometry. Use for CAD fit verification before ordering.
Complete guide: flange mounting, bore alignment, torque specs, anti-rotation, filtration, run-in procedure, and maintenance checklist. 650 KB.
AL6061 aluminum alloy material traceability, anodizing thickness report, Si3N4 ceramic seal composition, and RoHS compliance. Available upon request.
Not sure if BP-4P-30-0001 is the right model? Use this comparison to decide — and know exactly when to upgrade to a different passage count, higher pressure, or hollow bore size.
| Your Requirement | BP-4P-30-0001 Fit | Better Alternative | Why Upgrade |
|---|---|---|---|
| 4 air lines + Ø30mm hollow bore, rotary table | ✅ Perfect — quad passage with through-bore | — | — |
| 4 air lines only, no hollow bore needed | ✅ Good, but over-specified | BP-3P-0004 + BP-2P-0001 | Two smaller joints may be lighter and lower cost if bore is not needed |
| 3 air lines + 6 electrical circuits | ❌ No electrical integration | BP-3P-S06-0001 | Integrated slip ring with 6 circuits in same body size |
| Pressure >1.0 MPa (e.g., 1.2 MPa hydraulic) | ❌ Over pressure rating | BP-2P-0002 | 1.5 MPa rated, steel body, threaded mount for higher pressure |
| 8+ air lines needed | ❌ Too few passages | BP-8P-0001 | 8 passages in flange mount, 200 RPM, 0.85 kg |
| Dusty or abrasive environment (steel mill, foundry) | ❌ No dust protection | BP-2P-50-0001 | Dust-proof seal and protective shroud for abrasive environments |
| Food-grade or medical cleanroom | ❌ Standard anodized aluminum not FDA | Custom FDA-grade | 304/316 stainless steel body with FDA 21 CFR 177.2600 compliant seal |
The #1 cause of BP-4P-30-0001 warranty claims is warped flange faces from overtightening. A technician uses an impact driver and applies 8–10 N·m on M5 flange bolts rated for 4–5 N·m. The aluminum flange distorts, compressing the seal housing unevenly and creating a leak path at passage 3. 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 Si3N4 seal quality and requests a replacement — but the root cause was flange torque. Rule: Use a torque wrench. Tighten M5 flange bolts to 4–5 N·m in a cross pattern. Check flange flatness with a straightedge after tightening.
A machine builder needs faster indexing and runs BP-4P-30-0001 at 120 RPM to reduce cycle time. At 120 RPM, the Si3N4 ceramic particles generate frictional heat faster than the PTFE matrix can dissipate it. The seal temperature rises from 40°C to 75°C within 30 minutes, softening the PTFE and reducing contact pressure. Within 2 months, all 4 passages leak. Rule: 80 RPM is the continuous rating. For occasional indexing spikes up to 100 RPM, limit to 10% duty cycle. For sustained 120+ RPM, specify a high-speed seal design or choose BP-8P-0001 (200 RPM rated).
A maintenance team installs BP-4P-30-0001 on a CNC rotary table with water-soluble coolant containing aluminum chips. They immediately run it at 0.6 MPa and 60 RPM. The Si3N4 ceramic particles have not aligned with the shaft surface finish, and sharp chip edges score the seal groove. Within 3 weeks, passage 2 leaks coolant into the bearing housing, destroying the deep groove ball bearing. The team replaces the entire joint, but the same thing happens because they skip the run-in and use no upstream filtration. Rule: Run at 0.2 MPa and 20 RPM for 5 minutes before full operation. Install a 40-micron filter and Y-strainer upstream. This beds the seal and extends life from 3 months to 10+ months in abrasive coolant.
Other rotary joints commonly purchased with BP-4P-30-0001 — or the models you upgrade to when your application outgrows 4 passages or needs a different bore size.
The standard version uses AL6061 Aluminum Alloy construction combining lightweight AL6061 body with high-strength 45# steel shaft. For full steel options, contact our team. All versions are ISO9001 certified. The export version includes English-language documentation, CE marking, and RoHS compliance certificate. The domestic version is identical in mechanical performance but ships with Chinese-language documentation. Both versions use the same PTFE + Si3N4 ceramic seal and are 100% pressure tested before shipment.
Yes — the PTFE + Si3N4 ceramic seal is compatible with water, water-soluble coolant, and light hydraulic oil (up to ISO VG 32). The Si3N4 ceramic filler provides exceptional wear resistance against hard water scale and coolant particles that would destroy a pure PTFE seal. For continuous water exposure, the anodized AL6061 body provides good corrosion resistance, but specify a nickel-plated or stainless steel (304/316) version for deionized water or aggressive synthetic coolant. Derate pressure to 0.7 MPa for continuous water duty to maximize seal life.
Download the 2D PDF drawing for exact flange dimensions, bolt circle diameter (P.C.D.), hole size, and tolerances. The flange uses a standard bolt pattern compatible with most automation rotary table manufacturers. Ensure your equipment mating flange matches before ordering. Custom flanges with different P.C.D., hole count, or thickness are available upon request with a 5–7 day custom lead time. The Ø30mm bore is concentric to the flange within 0.05 mm TIR to ensure smooth rotation when mounted.
Yes — free 3D STEP and IGES files are provided after you send an inquiry email. The file includes the AL6061 body geometry, Ø30mm bore envelope, flange bolt pattern, port positions, and anti-rotation tab geometry. Use the 3D file to verify clearance, bore alignment, and thread engagement length 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. Include your CAD platform name for optimized file formatting.
Upgrade when your application needs more than 4 air passages or a bore size different from Ø30mm. Common triggers: (1) You add a fifth pneumatic function to a 4-function fixture — BP-8P-0001 provides 8 passages in the same flange-mount family. (2) Your central shaft or cable bundle is larger than Ø30mm — contact Begapunk for custom Ø40mm or Ø50mm bore options. (3) Your pressure requirement exceeds 1.0 MPa — a custom steel-body design with thicker walls handles 1.5–2.0 MPa. (4) Your environment becomes dusty or abrasive — BP-2P-50-0001 has dust-proof protection, though it is limited to 2 passages. The upgrade cost is typically $40–$100 more than BP-4P-30-0001, but it prevents the redesign cost of outgrowing an undersized joint.
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, continuous water immersion, food-grade, or cleanroom environments — consult Begapunk factory engineering before specification. Last updated: June 11, 2026.