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CONNECT STORZ DIN ALU 251

CONNECT STORZ DIN ALU 251 is a Storz system adapter with female thread, manufactured from aluminium with NBR seal. The Storz coupling's core idea is that two halves are clamped together via a quarter turn of a lever (the lock is fast and tool-free) - a construction originally developed for fire brigade hoses and later spread to industrial installations where fast coupling and uncoupling are critical. The adapter variant has internal G-thread (BSPP / British Standard Pipe Parallel) allowing mounting on standard pipe system stutsen. Working pressure 16 bar. Offered in 16 variants with different lug distances (31, 52, 66, 81, 89, 115 mm matching Storz standard sizes D, B, C) and different inch threads from 3/4 to 4 inches. Main material: forged aluminium lug part.

Download datasheet (PDF)

Storz Aluminium 16 bar BSPP thread
  • Aluminium
  • Storz system
  • 16 variants
  • BSPP thread
  • 16 bar
  • Quick-coupling

Technical specifications

The product's key specifications are briefly summarised below.

Type Storz system adapter with female thread
Material Aluminium (forged). Seal: NBR
Thread standard BSPP / G-thread (DIN ISO 228)
Thread range 3/4 to 4 inches
Storz sizes D (31 mm), B (52/66 mm), C (66/81/89 mm), 115 mm
Working pressure 16 bar
Colour White (aluminium with white outer coating)
Dimensions 16 variants - lug distance 31 to 115 mm
Standards DIN-Storz + RoHS + REACH
Manufacturer SKU 5111

Dimensions and ordering

The table shows CONNECT STORZ DIN ALU 251's standard dimensions.

Dimensions, pressure and vacuum data for CONNECT STORZ DIN ALU 251
Inner Ø
[mm]		 Working pressure
DIN 26057, 10 % elong. [bar]		 Weight
[kg/m]		 Article no.
31160.085111019031
31160.0785111025031
52160.1655111032052
52160.1525111038052
66160.2875111025066
66160.3035111032066
66160.2685111038066
66160.2715111050066
66160.2815111063066
81160.3845111050081
81160.3745111063081
81160.4085111075081
89160.4285111050089
89160.4285111063089
89160.4185111075089
115160.8045111100114

Each dimension has its own article number. Weight is per piece.

Frequently asked questions

What is a Storz coupling?

The Storz coupling is a historically important coupling system developed in Germany (originally by Carl August Guido Storz in 1882) for fire brigade hoses. The construction has two identical halves with metallic lugs that interlock with each other via a quarter turn. This provides a sealed connection + lock in a single manual action - fast, tool-free and extremely reliable. Today Storz is used broadly in industrial applications where fast coupling/uncoupling is critical: fire brigade fighting, industrial water transport, temporary pipe connections in construction sites.

What do D / B / C / 115 mm mean?

D, B, C are the Storz standard's category designations for different sizes. D is the smallest (31 mm lug distance), used typically for 3/4-1 inch pipe connection. B is mid-size (52-66 mm). C is larger (66-89 mm). 115 mm is the largest for 4 inch pipe connection. producentens adapter catalogue covers all 4 main categories in 16 specific variant combinations.

For which applications?

CONNECT STORZ 251 is typically used where a fast coupling must be established between a standardised pipe end and either a new hose end or another Storz attachment. Examples: fire brigade fighting, industrial water transport, temporary pipe connections, construction site water distribution. It is NOT specifically developed for our AIRDUC hose catalogue but can in specific applications be integrated with pipe systems serving hose installations.

Is the adapter sold individually?

Yes. Each Storz size + thread combination has its own article number (all start with 5111). producentens Storz catalogue has 16 standard variants for the most used D/B/C/115 mm + inch thread combinations. For specific variant combinations not in this table, contact us.