Aluminum Pin Lug Coupling
Aluminum pin lug couplings are essential components in industrial fluid transfer systems, providing secure connections and efficient fluid flow. These couplings are manufactured using high-quality aluminum, making them lightweight, durable, and resistant to corrosion.
Aluminum Pin Lug Coupling Supplier from China
The Aluminum Pin Lug Coupling — also known as a Boss, ground-joint or pin-lug coupling — is a rugged, economical coupling in which two lugs on the male end engage matching slots on the female end and lock by a quarter turn.
Made from cast aluminium, it is widely used on water suction and discharge hose, irrigation lines and general industrial service where a durable but lightweight coupling is required.
Technical Specifications
| Item | Specification |
|---|---|
| Product Type | Aluminium Pin Lug Coupling (Boss / Ground Joint) |
| Material | Cast aluminium with steel or brass pins |
| Size Range | 1/2" to 6" |
| Connection | Hose shank, BSP / NPT thread |
| Working Pressure | Up to 10 bar (150 PSI) |
| Working Temperature | -20°C to +120°C |
| Gasket | NBR, EPDM or leather washer |
| Locking | Quarter-turn pin and slot |
| Surface Finish | Natural, anodised or painted |
| MOQ | 200 pcs per size |
Key Features
- Quarter-turn pin-and-slot lock makes connection fast and positive.
- Lightweight cast aluminium body — far easier to handle than iron or steel.
- Ground-joint metal-to-metal seat with a washer gives a reliable, reusable seal.
- Inexpensive enough to be kept as spares across a whole hose fleet.
- Hose shank and threaded ends available for both hose and pipe connection.
- Corrosion-resistant in water, irrigation and general outdoor service.
Application Scenarios
- Water suction & discharge: portable water pumps, dewatering and tank filling.
- Irrigation: portable hose lines, sprinklers and pump connections.
- Construction: site water supply, dust suppression and wash-down.
- Agriculture: liquid manure transfer and general farm water lines.
- General industry: non-corrosive liquid and air service on plant utility hose.
Customization & OEM Service
ShengYa supplies aluminium pin lug (Boss / ground joint) hose couplings to distributors, hose assemblers and OEM equipment builders worldwide. We support full customization:
- Size & specification: non-standard bore, band width or thread pitch built to your drawing.
- Material selection: carbon steel, stainless steel 304/316, brass, aluminium, PP or nylon to match the medium.
- Sealing & gasket: NBR, EPDM, Viton, PTFE or silicone gaskets for chemical, oil or food contact.
- Branding: laser-engraved logo, stamped part number, custom label and retail/wholesale packaging.
- Documentation: material certificate, dimensional report and pressure-test report on request.
Packaging & Delivery
Standard packing is polybag + inner box + export carton, or bulk-packed on request. Typical MOQ is 500 pcs per size for customized orders and 100 pcs for stocked sizes. Lead time is 7–15 days for stock and 20–30 days for customized production. Samples are available for evaluation before bulk order.
Frequently Asked Questions
How does the pin lug locking work?
The male end has two protruding pins that drop into L-shaped slots on the female end; a quarter turn pulls the two faces together onto the gasket to form the seal.
Is aluminium suitable for drinking water?
Aluminium pin lug couplings are generally used for non-potable water, irrigation and industrial service. For potable water we recommend stainless steel or specific food-grade fittings.
What gasket should I use?
NBR rubber washers suit water and general service; leather washers are traditional on suction lines; EPDM is better for hot water. We stock all three.
Can I replace just the pins?
Yes. Pins and washers are available as spare parts, so a worn coupling can often be repaired rather than replaced.
