Is the BEL 45° Twisted Tubular Hydraulic Fitting SMR311, Light Series Carbon Steel compatible with both rubber and thermoplastic hoses when used with a screwed sleeve?

Yes. The BEL 45° Twisted Tubular Hydraulic Fitting SMR311, Light Series Carbon Steel is specifically engineered for use with both rubber and thermoplastic hoses when assembled with a screwed sleeve. Its BEL cutting ring sealing system provides precise, leak-free connections, and the carbon steel construction with a galvanized finish ensures durability and corrosion resistance, making it compatible and reliable for a wide range of applications.

Can the BEL 45° Twisted Tubular Hydraulic Fitting SMR311, Light Series Carbon Steel be used in high-pressure hydraulic systems without additional reinforcement for rubber or thermoplastic hoses?

No — the BEL 45° Twisted Tubular Hydraulic Fitting SMR311, Light Series Carbon Steel is designed to provide a secure, leak-free connection with rubber and thermoplastic hoses when used in combination with the appropriate screwed sleeve and its cutting ring (BEL) sealing system, but it is intended for light-series applications. The description emphasizes reliable sealing, corrosion resistance and durability, yet does not specify ratings for high-pressure hydraulic service or state that additional reinforcement of rubber or thermoplastic hoses is unnecessary under high pressures. For high-pressure systems, hoses typically require reinforcement (braiding or steel wire) and components must be rated for the system’s maximum working pressure and safety margin. Before using SMR311 without extra hose reinforcement, verify the fitting’s and hose’s published maximum working pressure, compatibility with your hose assembly (including sleeve and cutting ring), and applicable standards; if ratings are not adequate, use reinforced hoses or a fitting explicitly rated for high-pressure service.

BEL 45° Twisted Tubular Hydraulic Fitting SMR311, Light Series Carbon Steel

All products, Fittings for high-pressure hoses/

Additional information

Material	CS – steel (cast iron)

The screwed hydraulic end type S with metric tube and 45° angle in light series is a reliable solution designed for secure and durable connections in hydraulic systems. Equipped with a cutting ring (BEL) sealing system, it ensures precise fitting and leak-free performance even under demanding operating conditions. Manufactured from high-quality carbon steel with a galvanized finish, it offers excellent resistance to corrosion and mechanical wear, extending the service life of the installation. This fitting is specifically engineered for use with rubber and thermoplastic hoses in combination with a screwed sleeve, providing versatility and compatibility across a wide range of applications. Its robust construction, combined with ease of assembly, makes it an ideal choice for industries requiring efficiency, safety, and long-term reliability in hydraulic connections.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
TI-SMR311-04-03	End, 45° threaded tube 4 mm, hose 3/16", lightweight	5	-
TI-SMR311-06-04	End, 45° threaded tube 6 mm, hose 1/4", lightweight	6	-
TI-SMR311-08-04	End, 45° threaded tube 8 mm, hose 1/4", lightweight	6	-
TI-SMR311-10-05	End, 45° threaded tube 10 mm, hose 5/16", lightweight	8	-
TI-SMR311-12-06	End, 45° threaded tube 12 mm, hose 3/8", lightweight	10	-
TI-SMR311-15-08	End, 45° threaded tube 15 mm, hose 1/2", lightweight	12	-
TI-SMR311-18-10	End, 45° threaded tube 18 mm, hose 5/8", lightweight	16	-
TI-SMR311-22-12	End, 45° threaded tube 22 mm, hose 3/4", lightweight	20	-

The screwed hydraulic end type S with metric tube and 45° angle in light series is a reliable solution designed for secure and durable connections in hydraulic systems. Equipped with a cutting ring (BEL) sealing system, it ensures precise fitting and leak-free performance even under demanding operating conditions. Manufactured from high-quality carbon steel with a galvanized finish, it offers excellent resistance to corrosion and mechanical wear, extending the service life of the installation. This fitting is specifically engineered for use with rubber and thermoplastic hoses in combination with a screwed sleeve, providing versatility and compatibility across a wide range of applications. Its robust construction, combined with ease of assembly, makes it an ideal choice for industries requiring efficiency, safety, and long-term reliability in hydraulic connections.