GOST & Rotta Fire Hose Couplings
Aluminum or brass cast couplings built to GOST 28352-89. Gost's symmetrical two-claw hermaphrodite design links hose to hose or pump; Rotta's rigid 3-lug end-piece locks hose to hydrants and fire engine pumps. DN50–DN150, BSP thread, 16 bar rated, NBR gasket (-30°C to +120°C). Reliable, field-ready connections for fire suppression systems.
Description
Ca-Fire Protection Co.,Ltd is one of the most credible manufacturers and suppliers of gost & rotta fire hose couplings in China. Welcome to wholesale custom made fire equipment products at competitive price from our factory. Contact us for more cheap products.
Products Description
GOST & Rotta
Fire Hose Couplings
Product Datasheet - Hose Coupling Series
Symmetrical hermaphrodite claw couplings and 3-lug interlocking Rotta fittings, built to GOST 28352-89 for connecting fire hoses to hydrants, pumping units and hose appliances across the CIS market.
STD GOST 28352-89
SIZE DN50–DN150
PRESSURE 16 BAR / 232 PSI
THREAD BSP
Two Coupling Systems, One Standard
Both fittings are manufactured to the GOST 28352-89 normative regulation but solve different jobs on the hose line - one is genderless for hose-to-hose runs, the other is a fixed hydrant-side connector.
Gost Coupling
A two-claw hermaphrodite connection system with no fixed male or female half, so any two units join in either orientation. Used to connect fire hoses to each other or to link a hose directly to a pumping unit - available across the full DN50–DN150 range.
Rotta Coupling
The Russian-standard fire hose end-piece, formed as a rigid interlocking fitting with 3 lugs. It terminates the hose and locks onto hydrants, fire engine pump outlets, and other hose appliances for a secure, quarter-turn engagement.
Technical Specification
| Parameter | Specification |
|---|---|
| Normative Standard | GOST 28352-89 |
| Nominal Sizes | DN50 to DN150 |
| Body Material | Cast Aluminum (Standard) / Cast Brass (Optional) |
| Working Pressure | 16 bar / 232 psi |
| Thread Type | BSP |
| Coupling Gasket | NBR, -30°C to +120°C |
| Connection Type | GOST: Symmetrical Two-Claw Hermaphrodite / Rotta: 3-Lug Rigid Interlocking |
Assembly Drawing - GOST DN50–52 Long Tail Coupling
Every coupling leaving Ca-Fire is built to a controlled assembly drawing. Below is the reference drawing for the GOST DN50, DN50–52 long-tail-pipe version, showing the four-part construction and casting materials used on the pump/tail side of the fitting.
| Item | Part Name | Material | Qty. |
|---|---|---|---|
| 1 | GOST DN50–52 Tail Pipe | ADC12 | 1 |
| 2 | GOST DN50 Body | 6082 | 1 |
| 3 | O-Ring, ID Ø56 × 2.4 mm | NBR | 1 |
| 4 | KA66 Edge-Free Binding Ring | NBR | 1 |
Assembly note: the O-ring is grease-coated on assembly; fit tolerance is controlled so the coupling can be tightened securely yet still disassembled for service without special tooling.
Where It's Used
Hydrant & Pump Connection
Rotta end-pieces lock hose lines directly onto fire hydrants and fire engine pump outlets for fast, secure deployment.
Hose-to-Hose Extension
Gost hermaphrodite couplings join two hose lengths in either orientation to extend reach across a fireground.
Suction Line Assemblies
Used on suction hoses feeding pumping units, matched with brass or aluminum bodies depending on the application.
Why Source From Ca-Fire
Foundry-Controlled Casting
Aluminum and brass bodies produced from controlled assembly drawings with dimensioned tolerances.
01
GOST 28352-89 Compliant
Sizing, thread type and pressure rating built to the Russian normative standard for fire coupling hardware.
02
Full DN50–DN150 Range
One supplier for the complete size run, plus custom tail-pipe lengths and thread variants on request.
03
OEM & Overseas Programs
Established export documentation and client-specific part numbering for overseas hose accessory buyers.
04
FAQ
Q: What is the difference between a Gost coupling and a Rotta coupling?
A: A Gost coupling is symmetrical and hermaphrodite - it has two identical claws, so any two units join together regardless of orientation, making it suited to hose-to-hose or hose-to-pump connections. A Rotta coupling is a fixed, 3-lug rigid interlocking end-piece fitted to one end of the hose, designed specifically to lock onto hydrants, fire engine pumps and other fixed hose appliances.
Q: What sizes are available, and can Ca-Fire produce custom sizes?
A: Standard production covers DN50 up to DN150 in line with GOST 28352-89. Custom tail-pipe lengths, hose-tail diameters and thread configurations - such as the DN50–52 long-tail variant shown in our assembly drawing - can be produced against a client-approved drawing.
Q: What materials and pressure rating do these couplings carry?
A: Bodies are cast in aluminum (standard) or brass (optional, e.g. 6082 alloy for the main body and ADC12 for the tail pipe on our reference drawing), rated for a working pressure of 16 bar / 232 psi with a BSP thread interface.
Q: What gasket material is fitted, and what temperatures can it handle?
A: Each coupling is sealed with an NBR gasket, rated for continuous service from -30°C to +120°C, suitable for outdoor hydrant and fireground use across a wide climate range.
Q: Can these couplings be supplied under our own part numbers for OEM or overseas orders?
A: Yes. Ca-Fire regularly manufactures against client-supplied assembly drawings and part numbering - as shown on our own controlled drawing (DWG No. 3401013-1) - and can mirror your part numbers, packaging and documentation for OEM and overseas distribution orders.
Our address
NO.8, YUANFENG ROAD, MEIYUAN VILLAGE, KANGMEI TOWN, NANAN CITY, QUANZHOU CITY, FUJIAN CHINA
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