STORZ couplings are symmetrical, non‑shut‑off hose couplings widely used in firefighting, industrial water transfer, agricultural irrigation, and dewatering applications. Known for their quick bayonet‑style connection, STORZ couplings allow two identical halves to be joined by pressing together and twisting a quarter‑turn – no tools required under normal conditions.
A complete STORZ coupling consists of three components: the hose tail (body), the lugs (locking teeth), and the segment clamp (binding). The hose tail inserts into the hose end, the lugs engage with the mating coupling, and the segment clamp secures the assembly to the hose.
Firefighting – Connect fire hoses to hydrants, pumps, and standpipes; compatible with DIN 14302, NFPA 1963 standards
Industrial Water Transfer – High‑pressure water delivery for construction sites, mining dewatering, and municipal supply
Agricultural Irrigation – Quick‑connect solution for temporary or permanent irrigation lines
Oil & Gas – Water transfer for shale gas fracking (in combination with TPU layflat hose and grooved couplings)
Symmetrical design – No male/female orientation; any two same‑size STORZ couplings connect together
Tool‑free operation – Quarter‑turn bayonet locking allows rapid deployment in emergency or field conditions
Multiple material options – Cast aluminum (economical), forged aluminum (high strength), stainless steel (maximum corrosion resistance)
Customizable clamping – Single, double, or split clamps available to match hose type and pressure requirements
Interchangeable – All STORZ couplings of the same size share standardized lug spacing
Complete system solution – Our STORZ couplings are compatible with TPU layflat hoses, NBR layflat hoses, and fire hoses. For custom sizes beyond 16″ or special materials (e.g., brass, bronze), please contact our sales team.
Our STORZ couplings are available in three material grades to suit different applications and budgets:
| Material | Process | Key Characteristics |
|---|---|---|
| Cast Aluminum | Casting | Economical option, suitable for standard water transfer applications |
| Forged Aluminum | Forging | Higher strength‑to‑weight ratio, superior impact resistance, hardcoat anodized finish available |
| Stainless Steel | Machined | Maximum corrosion resistance for marine, chemical, or extreme environment applications |
Forged aluminum couplings are machined from 6061‑T6 aluminum with hardcoat anodizing per MIL‑A‑8625 Type III Class 1, offering significantly higher strength than cast alternatives.
The number of lugs on a STORZ coupling varies by nominal size:
| Size Range | Lug Count | Typical Standard |
|---|---|---|
| 2″ – 5″ | 2 lugs | DIN C / D type |
| 6″ – 14″ | 3 lugs | DIN A / B type |
| 14″ and above | 3 or 4 lugs | Heavy‑duty / custom |
The lug spacing (Ka dimension) is standardized – all couplings with the same lug spacing are mutually compatible regardless of material or tail diameter.
The clamp (binding) that secures the coupling to the hose is available in three configurations:
| Clamp Type | Description |
|---|---|
| Single Clamp | One continuous band with a single bolt tightening mechanism; suitable for standard service |
| Double Clamp | Two independent bands or a reinforced design with dual tightening points; provides extra grip for high‑pressure or heavy‑duty applications |
| Split Clamp (Tile / Segmented Clamp) | Multi‑segment design (typically 3 segments) that wraps around the hose and tailpiece; each segment is bolted individually, allowing even clamping force distribution and easy field replacement |
Split (segmented) clamps are preferred for larger diameters and high‑pressure service, as they distribute compression evenly around the hose circumference and minimize stress concentration.
