Dual-passage M5 threaded rotary joint for pneumatic and light fluid applications. Compact design, PTFE composite seal, AL6061 body. Two independent passages for micro electronic turntables, miniature dispensing heads, and small dual-channel automation. Ships in 7 days.
BP-2P-08-0001 is a dual-passage M5 threaded rotary joint designed for miniature pneumatic applications. The M5 thread matches small metric pneumatic fittings common in European and Asian automation equipment. The AL6061 body keeps weight at 280 g, making it suitable for small rotary tables driven by stepper motors. The PTFE composite seal provides chemical resistance across air, water, and coolant media.
| Model Number | BP-2P-08-0001 |
|---|---|
| Number of Passages | 2 Passages (2-in-2-out) |
| Mount Type | M5 Threaded |
| 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 |
| Seal Type | PTFE Composite Seal |
| Compatible Media | Air, Water, Coolant, Light Hydraulic Oil (ISO VG 32 max) |
| Operating Temperature | -20°C to +80°C |
| Net Weight | Approx. 0.28 kg (280 g) |
| Certifications | ISO 9001:2015, CE, RoHS |
| Warranty | 12 Months |
AL6061 aluminum body: 6061-T6 aluminum alloy with yield strength 276 MPa and density 2.70 g/cm³. The anodized surface provides corrosion resistance for intermittent water and coolant exposure. At 280 g, the body is ideal for small stepper-motor-driven rotary tables where inertia matters. Not recommended for continuous immersion in aggressive coolant without additional surface treatment.
PTFE composite seal: Polytetrafluoroethylene with glass fiber and graphite filler. Self-lubricating, chemically inert, and rated for -200°C to +260°C. The dual-passage design uses two independent seal rings, one per channel, ensuring no cross-contamination between the two air circuits. FKM O-ring provides static sealing at the housing interface.
M5 thread note: M5 × 0.8 metric fine thread provides a compact connection for 4 mm and 6 mm pneumatic tubing push-to-connect fittings. The small thread size limits maximum flow compared to G1/8 — verify your CFM requirement before specifying. For higher flow, upgrade to BP-2P-0002 (G1/8, 4mm orifice).
BP-2P-08-0001 is designed for miniature dual-passage pneumatic applications where M5 metric fittings and low weight are required. The 280 g body and compact threaded mount make it ideal for small electronic and precision equipment. 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-08-0001 is overtightening the M5 threaded connection, which cracks the lightweight AL6061 housing. Follow these steps for reliable operation.
Confirm your equipment's mating thread matches the rotary joint thread specification. BP-2P-08-0001 uses M5 × 0.8 metric fine thread. Do not force an imperial or NPT adapter — the small M5 thread has limited material engagement and will strip the AL6061 housing. Download the 2D drawing for exact thread dimensions, pitch (0.8 mm), and tolerances. Verify your pneumatic fittings are M5-compatible before ordering.
Use PTFE tape (2–3 wraps) or anaerobic liquid thread sealant on the M5 male threads. Hand-tighten plus 1/8 turn maximum. Overtightening cracks the AL6061 housing or strips the fine M5 threads. Torque spec: 2–3 N·m for M5. Use a small torque wrench — "finger tight" is often sufficient for M5. If you feel resistance increase sharply, stop — the thread is bottoming or the housing is flexing.
If your model includes an anti-rotation tab, secure it to a fixed point with a loose-fit pin or slot. Never let the body rotate freely with the shaft — the supply hose will twist and the seal will experience reverse torque, accelerating wear. For M5-threaded joints without an anti-rotation tab, use a bracket clamped around the body hex or cylindrical surface. Do not clamp so tightly that you deform the housing.
Use flexible hoses (not rigid pipe) to connect both stationary inlet ports to the air supply. Rigid pipe transfers vibration and thermal expansion directly to the joint, stressing the seal. Install a 40-micron filter upstream of each inlet to protect the PTFE seal from debris. For water or coolant, add a Y-strainer (60 mesh) to prevent particulate damage. Use 4 mm or 6 mm pneumatic tubing with M5 push-to-connect fittings.
Run at low pressure (0.2 MPa) and low speed (50–100 RPM) for 5 minutes without load on both passages. This beds the PTFE seals against the shaft surface, creating a micro-smooth contact zone. Check for leaks at the thread and both 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 — the seal needs time to conform to the shaft surface finish.
Full dimensions, tolerances, thread specs (M5 × 0.8), shaft finish requirements, and seal groove details. 120 KB.
Free 3D files provided after inquiry. Includes M5 thread option and dual-passage port arrangement. Use for CAD fit verification before ordering.
Complete guide: thread matching, 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-2P-08-0001 is the right model? Use this comparison to decide — and know exactly when to upgrade to a larger-thread or flange-mounted joint.
| Your Requirement | BP-2P-08-0001 Fit | Better Alternative | Why Upgrade |
|---|---|---|---|
| Dual air lines, M5 thread, compact envelope | ✅ Perfect — 280 g, M5 mount | — | — |
| Small electronic turntable, low weight, low speed | ✅ Good — 200 RPM, 280 g | — | — |
| Need G1/8 or larger thread for higher flow | ❌ M5 is too small | BP-2P-0002 | G1/8 thread, 4mm orifice, 300 RPM |
| Pressure >1.0 MPa (e.g., 1.2 MPa hydraulic) | ❌ Over pressure rating | Custom high-pressure | 1.5 MPa rated custom design available |
| 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 seal not FDA | Custom FDA-grade | FDA 21 CFR 177.2600 compliant seal |
| Need flange mount rigidity for heavy machine frame | ❌ Threaded mount only | BP-2P-0001 | Flange mount, AL6061 + steel, 200 RPM |
The #1 cause of BP-2P-08-0001 warranty claims is overtightening. A technician treats M5 like G1/8 and applies 8 N·m on an M5 thread rated for 2–3 N·m. The fine M5 threads strip out of the AL6061 housing, or the housing cracks at the thread root. Within hours, the joint is loose and leaking. The technician blames thread quality and requests a replacement — but the root cause was installation torque. Rule: Use a small torque wrench. Hand-tighten plus 1/8 turn maximum. For M5: 2–3 N·m. If resistance spikes, stop immediately.
A machine builder connects both M5 ports with rigid 6 mm copper tube to "save space" in a compact electronic fixture. The rigid tube transfers vibration from the machine frame to the 280 g joint, creating a fatigue load on the M5 threads. Within 4 weeks, one M5 port cracks and the thread tears out of the housing. The builder blames housing quality, but the root cause was rigid piping on a lightweight joint. Rule: Use flexible pneumatic tubing with M5 push-to-connect fittings. Rigid pipe is acceptable only if supported independently — never let the pipe load the joint.
A maintenance team installs BP-2P-08-0001 on a micro dispensing head and immediately runs it at 0.8 MPa and 150 RPM. The PTFE seals have not bedded into the shaft surface — microscopic high spots create leak paths. Within 2 weeks, dispensing air pressure drops from 0.5 MPa to 0.3 MPa, and adhesive volume becomes inconsistent. The team replaces both seals, 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 on both passages before full operation. This beds the seals and extends life from 6 months to 12+ months.
Other rotary joints commonly purchased with BP-2P-08-0001 — or the models you upgrade to when your application outgrows M5 threads.
The standard version uses full AL6061 construction for higher strength and durability in a lightweight package. All versions are manufactured to the same ISO 9001:2015 quality system and undergo 100% pressure testing before shipment. The domestic and export designations refer only to packaging and documentation language — the product itself is identical. For full steel body options or custom materials, contact our engineering team.
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 body has an anodized surface that provides good corrosion resistance for intermittent water exposure, but continuous immersion requires nickel plating or stainless steel (304/316) specification. If your application involves deionized water or aggressive coolant, contact Begapunk for seal compatibility review.
BP-2P-08-0001 uses M5 × 0.8 metric fine thread per ISO 261/ISO 965. The fine pitch (0.8 mm) provides more thread engagement in the short depth typical of miniature pneumatic fittings. M5 threads seal on a gasket or O-ring at the port face, not on the thread itself. This means PTFE tape on the thread is for sealing only; the mechanical connection is made by the flat face compressing against the mating port. Download the 2D PDF drawing for exact thread dimensions, pitch, and tolerances. G1/8 and metric thread options are available as custom orders.
Yes — free 3D STEP and IGES files are provided after you send an inquiry. The file includes the M5 thread option, dual-passage port arrangement, and overall envelope dimensions. Use the 3D file to verify clearance, port direction, 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 software name if you need a specific file format.
Upgrade when your application needs larger threads, higher pressure, flange mount rigidity, or a dust-proof seal. Common triggers: (1) You need G1/8 or larger fittings for higher air flow — BP-2P-0002 provides G1/8 with 4mm orifice and 300 RPM. (2) Your pressure requirement exceeds 1.0 MPa — contact Begapunk for custom high-pressure designs. (3) You need flange mount for heavy machine-frame integration — BP-2P-0001 provides a bolted flange with AL6061 + steel construction. (4) Your environment becomes dusty or abrasive — BP-2P-50-0001 has dust-proof protection. The upgrade cost is typically $15–$40 more than BP-2P-08-0001, but it prevents the $200+ cost of production downtime from inadequate flow or mounting strength.
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.