C-Type Self-Locking Air Line Quick Release Fittings — Hose Compressor Connectors

Match the fitting size to your hose inner diameter and tool inlet thread. Size 20 typically corresponds to 1/4" (≈6mm), Size 30 to 3/8" (≈10mm), and Size 40 to 1/2" (≈13mm). When in doubt, check your compressor hose end or tool inlet thread size before ordering. Using a fitting that is too small will restrict airflow; too large will not seat correctly.

C-type self-locking air fittings are generally rated for working pressures up to 150 PSI (approximately 10 bar), which covers the output range of most home and workshop air compressors. Always verify the pressure rating on the product label before use in high-demand or industrial applications.

These fittings are typically made from zinc alloy or brass with a corrosion-resistant finish, making them suitable for workshop and garage environments. For prolonged outdoor or high-humidity exposure, applying a light coat of lubricant and storing connectors indoors when not in use is generally recommended to extend service life.

C-type quick release fittings in this size range are commonly compatible with BSP (British Standard Pipe) threads. Compatibility with NPT threads depends on the specific variant. Please check the size option description or contact us to confirm the thread standard before ordering if your tools or hoses use NPT connections.

Each set includes a plug (P) and a socket (S). The plug is the male connector that inserts into the socket. The letter after P or S indicates the connection type: P = Push-to-connect, H = Hose tail, M = Male thread, F = Female thread. The number (20, 30, 40) indicates the size class. For example, PP20+SP20 is a push-to-connect plug and socket pair in Size 20 (1/4").

The C-type self-locking design uses a spring-loaded collar on the socket. Push the plug in until it clicks — the collar locks it in place automatically. To disconnect, pull back the collar sleeve and withdraw the plug. No tools are needed, and the connection is generally airtight under normal working pressures, making it ideal for frequent tool changes.

Plugs and sockets must match in size class (e.g., a Size 20 plug with a Size 20 socket). Mixing size classes will not produce a secure or airtight connection. Within the same size class, different connection types (hose tail, male thread, female thread) are interchangeable as long as the size number matches.