Dual-passage flange-mount rotary joint with 16mm central bore. PTFE composite seal, AL6061 aluminum body. Ideal for pneumatic and light fluid applications on CNC indexing tables, welding positioners, and packaging rotary tables. Ships in 7 days.
BP-2P-16-0001 is a dual-passage rotary joint with a 16mm central bore, designed for low-pressure pneumatic and light fluid transfer on compact rotary equipment. The PTFE composite seal provides low friction torque and chemical resistance across air, water, and coolant media. The AL6061 aluminum body offers a strength-to-weight ratio ideal for indexing tables where rotating inertia affects positioning accuracy.
| Model Number | BP-2P-16-0001 |
|---|---|
| Number of Passages | 2-in-2-out (16mm Bore) |
| Mount Type | Flange Mount (4-M5) |
| Max Pressure | 1 MPa (10 bar / 145 psi) — derate to 0.7 MPa for continuous water 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, coolant, light hydraulic oil (ISO VG 32 max) |
| Operating Temperature | -20°C to +80°C |
| Net Weight | Approx. 0.45 kg |
| Friction Torque | 0.05–0.10 N·m (air) / 0.08–0.15 N·m (water) |
| Certifications | ISO 9001:2015, CE, RoHS |
| Warranty | 12 Months |
AL6061 aluminum body: 6061-T6 aluminum alloy with yield strength 276 MPa and hardness 95 HB. The anodized surface provides corrosion resistance for intermittent water and coolant exposure. At 0.45 kg, it adds minimal rotating inertia to small indexing tables. Not recommended for continuous abrasive coolant without additional surface hardening — specify hard anodizing (Type III, 25 μm) for such environments.
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 aluminum) that makes PTFE ideal for rotary seals at 200 RPM. FKM O-ring provides static sealing at the housing interface.
16mm bore utility: The through-bore allows routing of 4–6 mm pneumatic tubing, sensor cables, or a central vacuum line. This is the primary reason machine builders choose BP-2P-16-0001 over BP-2P-0001 (no bore) — the bore eliminates the need for a separate slip ring or vacuum swivel.
BP-2P-16-0001 is designed for dual-air-line applications on compact rotary equipment where a 16mm through-bore adds routing flexibility. 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 BP-2P-16-0001 is uneven flange bolt tightening, which warps the aluminum housing and creates a leak path between passages. Follow these steps for reliable operation.
Confirm your equipment flange has 4×M5 threaded holes on a compatible bolt circle. BP-2P-16-0001 uses a compact flange pattern designed for 200–400 mm diameter rotary tables. Do not force-mount on a mismatched pattern — drilling new holes in the aluminum flange creates stress risers that crack under cyclic loading. Download the 2D drawing for exact P.C.D., hole diameter, and counterbore depth.
Secure the flange using 4×M5 screws with spring washers. Torque to 3–4 N·m in a cross pattern (torque screw 1, then 3, then 2, then 4) to distribute clamping force evenly. Overtightening beyond 5 N·m warps the AL6061 flange face, compressing the PTFE seal unevenly and creating an inter-passage leak path. Use a torque wrench — "snug plus a quarter turn" is not precise enough for a 0.45 kg aluminum body.
If your model includes an anti-rotation tab, secure it to a fixed bracket with an M4 or M5 screw. Never let the stationary body rotate with the shaft — the supply hoses will twist and the seal will experience reverse torque, accelerating wear. The anti-rotation arm should have 2–3 mm of clearance to allow for axial float during thermal expansion.
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 the two passages (e.g., "Clamp" and "Unclamp") to prevent cross-connection during maintenance.
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 for leaks at the flange gasket and seal interfaces. If dry, gradually increase to operating pressure and speed over 10 minutes. Skipping the run-in is the #2 cause of early seal failure on dual-passage joints — the seal needs time to conform to the shaft surface finish before full duty.
Full dimensions, tolerances, thread specs, flange bolt pattern (4-M5 P.C.D.), shaft finish requirements, and seal groove details. 120 KB.
Free 3D files provided after inquiry. Includes AL6061 body variant, 4-M5 flange pattern, and 16mm bore geometry. 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 aluminum material traceability, hardness test report, and RoHS compliance certificate. Available upon request with order.
Not sure if BP-2P-16-0001 is the right model? Use this comparison to decide — and know exactly when to upgrade to a larger-bore, higher-speed, or dust-proof joint.
| Your Requirement | BP-2P-16-0001 Fit | Better Alternative | Why Upgrade |
|---|---|---|---|
| Dual air lines, 16mm bore, compact table (<400 mm dia) | ✅ Perfect — 4-M5 flange, 0.45 kg | — | — |
| Dual air lines, no bore needed, lowest cost | ✅ Good — but BP-2P-0001 is cheaper | BP-2P-0001 | No bore = simpler, lower cost for same pressure and speed |
| 3+ independent air functions | ❌ Too few passages | BP-3P-0004 | 3 passages with independent seals, flange mount for rigidity |
| Larger bore (>16 mm) for bigger cables or pipes | ❌ Bore too small | BP-2P-30-0001 | 30mm bore, Ø76 mm body, deep groove ball bearing for radial loads |
| Pressure >1.0 MPa (e.g., 1.2 MPa hydraulic) | ❌ Over pressure rating | BP-2P-95-0001 | 10 MPa rated, heavy-duty composite body |
| Dusty or abrasive environment (steel mill, foundry) | ❌ No dust protection | BP-2P-50-0001 | Dust-proof seal and protective shroud, IP65 rated |
| Speed >200 RPM continuous | ❌ Over speed rating | BP-2P-0001 | 500 RPM rated for high-speed rotary tables |
The #1 cause of BP-2P-16-0001 warranty claims is uneven or excessive flange bolt torque. A technician tightens one M5 screw to 6 N·m before moving to the next, warping the AL6061 flange face. The result: an inter-passage leak where clamp air (0.6 MPa) bleeds into the unclamp line, causing the fixture to release mid-cycle. Rule: Torque all 4 M5 screws to 3–4 N·m in a cross pattern. Use a torque wrench. Check flange flatness with a feeler gauge if leaks appear.
A machine builder connects the stationary side with rigid steel tubing to "make it neat." Thermal expansion and table vibration transfer directly to the 0.45 kg aluminum body. Within 3 months, micro-cracks appear at the flange-to-body fillet, and the joint leaks at 0.4 MPa. The builder blames material quality — but AL6061 cannot absorb the stress concentration from rigid piping. Rule: Always use flexible pneumatic hose (minimum 6 mm bend radius) between the supply and the rotary joint. The hose absorbs vibration and thermal movement.
A maintenance team installs BP-2P-16-0001 on a packaging rotary table and immediately runs it at 0.8 MPa and 180 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-2P-16-0001 — or the models you upgrade to when your application outgrows a 16mm bore or 200 RPM.
The standard version uses full AL6061 construction for higher strength and durability. For aluminum body options, contact our team. All versions are ISO9001 certified. The export version includes English-language documentation, CE marking, and RoHS compliance certificate. Both versions use the same PTFE composite seal and have identical pressure, speed, and temperature ratings. Lead time is the same for both versions.
Yes — the PTFE composite seal and 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 aluminum body has good corrosion resistance for intermittent water exposure, but continuous immersion requires hard anodizing (Type III) or stainless steel specification. If your application involves deionized water or aggressive coolant, contact Begapunk for seal compatibility review.
BP-2P-16-0001 uses a flange mount with 4×M5 screws on a specific bolt circle diameter. Download the 2D PDF drawing for exact P.C.D., hole diameter, counterbore depth, and tolerances. Ensure your equipment mating flange matches before ordering. The compact pattern is designed for 200–400 mm diameter rotary tables. Custom flange patterns (e.g., 3-M6 or 6-M4) are available as special orders with 5–7 day additional lead time.
Yes — free 3D STEP and IGES files are provided after you send an inquiry. The file includes the AL6061 body variant, 4-M5 flange pattern, 16mm bore geometry, and anti-rotation bracket mounting hole pattern. Use the 3D file to verify clearance, port direction, and flange bolt engagement 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.
Upgrade when your application exceeds the 16mm bore, 200 RPM, or 1 MPa limits. Common triggers: (1) You need to route cables or pipes larger than 16 mm — BP-2P-30-0001 offers a 30mm bore. (2) Your table speed exceeds 200 RPM continuous — BP-2P-0001 handles 500 RPM. (3) Your pressure requirement exceeds 1.0 MPa — BP-2P-95-0001 handles 10 MPa. (4) Your environment becomes dusty or abrasive — BP-2P-50-0001 has dust-proof protection. (5) You need 3+ independent air functions — BP-3P-0004 provides triple passage. The upgrade cost is typically $15–$80 more than BP-2P-16-0001, but it prevents downtime from overloaded seals.
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.