Views: 0 Author: Site Editor Publish Time: 2026-09-18 Origin: Site
In pneumatic systems, the connection between tubing and components is just as critical as the components themselves. A poor connection leads to air leaks, pressure drop, energy waste, and unreliable equipment performance. The WAALPC B Series one-touch fittings are engineered to deliver fast, secure, and leak-free connections for compressed air systems — combining a compact push-in design with excellent sealing performance and broad thread compatibility.
The B Series covers a complete range of configurations, including straight connectors, elbow fittings, tee fittings, Y-fittings, bulkhead fittings, reducers, non-return valves, speed controllers, and 360° rotary joints. This guide explains their structure, working principle, key features, specifications, and selection criteria.
A one-touch fitting (also called a push-in fitting or instant fitting) is a pneumatic connector that allows tubing to be inserted and secured with a single push — no tools, no threading, no tightening. To release the tube, simply press the release sleeve and pull the tube out.
This design dramatically reduces assembly time, eliminates over-tightening errors, and allows repeated disconnection and reconnection without damaging the tube.
Component | Function | Material |
|---|---|---|
Body | Main housing; connects to thread or tube | Nylon 6.6 + glass fiber (plastic body); brass nickel-plated (thread) |
O-Ring | Seals the tube outer diameter | NBR (standard); EPDM / FKM available on request |
Claw (Gripping Ring) | Grips the tube securely | Stainless steel |
Back Ring | Supports the claw and maintains alignment | Engineering plastic |
Collar | Holds the claw assembly in place | Engineering plastic |
Sleeve (Release Button) | Releases the claw when pressed | Engineering plastic |
Thread Seal | Seals the threaded connection | O-ring on BSPP/metric threads; PTFE coating on BSPT/NPT threads |
Insert the tube: Push the tube straight into the fitting until it stops.
Grip: The stainless steel claw bites into the tube surface, preventing pull-out.
Seal: The O-ring compresses against the tube’s outer diameter, creating a leak-tight seal.
Release: Press the release sleeve inward; the claw disengages, and the tube can be pulled out.
The B Series is available with three major thread standards:
BSPT (R / PT) — tapered British standard pipe thread
BSPP (G) — parallel British standard pipe thread
NPT (N) — American standard tapered pipe thread
Metric (M) — M3, M5, M7, M10, M12
This makes the B Series suitable for equipment sourced from Europe, North America, Asia, and other regions.
The gripping ring and O-ring are located outside the tube, so the tube is not deformed or compressed. This means:
No reduction in internal flow area
No pressure loss
No turbulence or flow restriction
The threaded section features an optimized O-ring seal. On BSPP and metric threads, an O-ring sits in a recessed groove to seal against the mating port face. On BSPT and NPT threads, a special PTFE coating provides reliable sealing without additional tape or sealant.
The tube connection uses a precision O-ring that maintains sealing under both static and dynamic conditions.
Simply push the tube into the fitting. No tools, no tightening, no thread sealant. Disconnection requires only pressing the release sleeve.
The B Series includes:
Straight connectors (BC, BCF, BOC, BMF)
Elbow fittings (BL, BLL, BLF, BLM, BLJ)
Tee fittings (BT, BST, BGT, BUT)
Y-fittings (BY, BWT)
Bulkhead fittings (BPM, BMM)
Reducers (BG)
Non-return valves (BCVU)
Speed controllers (BSC, BSF)
360° rotary joints (BRC, BRU)
Plugs and caps (BUC, BUL, BUT)
Tube-to-tube unions (BUC, BUL, BUT)
Parameter | Specification |
|---|---|
Working Medium | Compressed air, water, vacuum |
Vacuum Capability | 755 mmHg (99% vacuum) |
Operating Temperature | –20°C to +60°C |
Working Pressure | Up to 15 bar at 0–10°C (depending on tubing type) |
Working Pressure (typical) | 0–10 bar |
Body Material | Nylon 6.6 + glass fiber |
Thread Material | Brass, nickel-plated |
Claw Material | Stainless steel |
O-Ring Material | NBR (standard); EPDM / FKM available |
Thread Types | BSPT, BSPP, NPT, Metric |
Tube Sizes | Ø3, Ø4, Ø6, Ø8, Ø10, Ø12 mm; 1/8", 5/32", 3/16", 1/4", 5/16", 3/8", 1/2" |
Thread | M3×0.5 | M5×0.8 | M7×1 | G1/8" | G1/4" | G3/8" | G1/2" |
|---|---|---|---|---|---|---|---|
Torque (N·m) | 0.06 | 0.16 | 0.8 | 0.8 | 1.2 | 3 | 3.5 |
The B Series product code is logical and easy to read.
Code | Meaning | Options |
|---|---|---|
BC | One-touch fitting type | BC, BCF, BL, BLL, BLF, BT, BST, BWT, BY, etc. |
06 | Tube outer diameter | 03, 04, 06, 08, 10, 12 mm; 1/8", 5/32", 3/16", 1/4", 5/16", 3/8", 1/2" |
01 | Thread size | 01 = R1/8, 02 = R1/4, 03 = R3/8, 04 = R1/2 (BSPT) |
G01 = G1/8, G02 = G1/4, G03 = G3/8, G04 = G1/2 (BSPP) | ||
N01 = NPT1/8, N02 = NPT1/4, N03 = NPT3/8, N04 = NPT1/2 | ||
N | Sleeve color | N = Black (standard) |
Prefix | Fitting Type |
|---|---|
BC | Straight male connector |
BCF | Straight female connector |
BL | Elbow male connector |
BLL | Elbow male connector (long) |
BLF | Elbow female connector |
BT | Tee male connector |
BST | Tee male connector (swivel) |
BWT | Y-fitting male |
BY | Y-fitting |
BUC | Union straight |
BUL | Union elbow |
BUT | Union tee |
BOC | Straight male connector (compact) |
BMF | Bulkhead male connector |
BMM | Bulkhead male connector (brass) |
BG | Reducer |
BSC | Speed controller (elbow) |
BSF | Speed controller (inline) |
BCVU | Non-return valve |
BRC / BRU | 360° rotary joint |
B Series one-touch fittings are used across virtually every industry that uses compressed air:
Assembly lines, pick-and-place systems, packaging machinery
Pneumatic cylinders, grippers, and actuators
Robotic end-of-arm tooling
Assembly tools, clamping fixtures, paint lines
Testing and inspection equipment
Packaging, filling, and labeling machinery
Washdown environments (with suitable materials)
Knitting, weaving, and dyeing equipment
High-cycle pneumatic actuation
Clean air systems, analytical instruments
Precision pneumatic control
Machine tools, printing presses, material handling
Plant-wide compressed air distribution
Cut the tube squarely with a tube cutter.
Deburr the tube end to remove sharp edges.
Verify tube O.D. matches the fitting size.
Push the tube straight into the fitting until it stops.
Gently pull back to confirm the tube is gripped.
Do not twist or rotate during insertion.
For BSPT/NPT threads, apply PTFE tape only if required (the B Series features pre-coated threads on many models).
Hand-tighten, then use a wrench to tighten to the recommended torque.
Do not overtighten — this can damage the thread or the fitting body.
Use filtered air (40μm or better)
Keep within the rated temperature and pressure
Support long tube runs to prevent stress on fittings
Avoid sharp bends below the minimum bend radius
Symptom | Possible Cause | Solution |
|---|---|---|
Air leak at tube connection | Tube not fully inserted; damaged O-ring; tube O.D. out of tolerance | Re-insert tube; replace O-ring; replace tube |
Tube pulls out | Damaged claw; incorrect tube size | Replace fitting; verify tube size |
Tube cannot be inserted | Debris in fitting; tube end not square | Clean fitting; re-cut tube |
Thread leak | Insufficient torque; damaged thread; missing O-ring | Tighten to spec; replace fitting; install O-ring |
Fitting corroded | Moisture or corrosive environment | Use stainless steel or brass nickel-plated variant |
Flow restriction | Tube kinked; fitting partially blocked | Re-route tube; clean or replace fitting |
Daily: Visual check for leaks
Monthly: Check tube grip and fitting tightness
Quarterly: Inspect O-rings and claws for wear
Annually: Replace seals or fittings showing signs of aging
Factor | Consideration |
|---|---|
Tube size | Match fitting to tube O.D. (Ø3–Ø12 mm or inch sizes) |
Thread type | BSPT, BSPP, NPT, or Metric — verify system standard |
Thread size | 1/8, 1/4, 3/8, 1/2, or metric M3/M5/M7/M10/M12 |
Fitting type | Straight, elbow, tee, Y, bulkhead, reducer, etc. |
Material | Plastic body with brass thread (standard); stainless steel available |
Working pressure | Ensure rating exceeds system pressure |
Temperature | Verify material compatibility with operating temperature |
Special function | Non-return, speed control, rotary, etc. |
Application: Connecting 6mm PU tubing to a cylinder port with G1/4 thread, requiring a 90° elbow.
Recommended: BL06-G02 (elbow male connector, Ø6 tube, G1/4 thread, black sleeve)
✅ Wide compatibility — BSPT, BSPP, NPT, and metric threads
✅ Full flow — No tube deformation, no flow loss
✅ Excellent sealing — Optimized O-ring and coated threads
✅ Fast installation — One push to connect, one press to release
✅ Complete range — Straight, elbow, tee, Y, bulkhead, reducer, non-return, speed controller, rotary
✅ Durable materials — Nylon body, stainless steel claw, brass nickel-plated thread
✅ Vacuum capable — Up to 755 mmHg (99% vacuum)
✅ Temperature range — –20°C to +60°C
✅ OEM support — Custom configurations available
The WAALPC B Series one-touch fittings provide a fast, reliable, and versatile solution for pneumatic tube connections. With a comprehensive range of configurations, wide thread compatibility, and excellent sealing performance, the B Series meets the demands of industrial automation, automotive, food processing, textile, electronics, and general manufacturing applications.
Key takeaways:
Type: One-touch push-in fittings
Threads: BSPT, BSPP, NPT, Metric
Tube sizes: Ø3–Ø12 mm; 1/8"–1/2"
Working pressure: Up to 15 bar (depending on tube)
Temperature: –20°C to +60°C
Vacuum: 755 mmHg (99%)
Materials: Nylon 6.6 + glass fiber body; stainless steel claw; brass nickel-plated thread; NBR O-ring
Range: Straight, elbow, tee, Y, bulkhead, reducer, non-return, speed controller, rotary
By selecting the correct fitting for your application and following proper installation practices, WAALPC B Series one-touch fittings will deliver reliable, leak-free performance for years.
For more information about WAALPC B Series one-touch fittings or to discuss your specific requirements, please contact our technical sales team or visit www.waalpc.com.
