Is the Nickel-Plated Steel Quick Coupling Plug with BSP/BSPT Thread, 350 Series CUPLA, NITTO KOHKI compatible with pneumatic systems or only hydraulic applications?

The Nickel-Plated Steel Quick Coupling Plug with BSP/BSPT Thread, 350 Series CUPLA, NITTO KOHKI is engineered primarily for demanding hydraulic applications. Its materials, Viton sealing, high maximum working pressure (up to 345 bar) and design characteristics (flat-face, leak-free, optimized for pulsating pressures) indicate suitability and certification for hydraulic systems. However, the coupling’s flat-face, low-air-inclusion design and robust construction also make it physically compatible with many pneumatic systems at lower pressures. Note that pneumatic use may require verification of seals and pressure ratings for specific compressed-air conditions and safety/regulatory compliance; the product’s listed temperature range and maximum pressure are optimized for hydraulic service rather than standard pneumatic ratings.

Can the Nickel-Plated Steel Quick Coupling Plug with BSP/BSPT Thread, 350 Series CUPLA, NITTO KOHKI be used in systems with aggressive hydraulic fluids or chemicals, and are Viton seals fully compatible?

Yes — the Nickel-Plated Steel Quick Coupling Plug with BSP/BSPT Thread, 350 Series CUPLA, NITTO KOHKI is suitable for many systems handling aggressive hydraulic fluids and chemicals. It is built from high-grade nickel-plated alloy steel for durability and the product description specifies Viton sealing, which provides superior chemical resistance and a wide operating temperature range (−20°C to +180°C). These properties make it compatible with a broad range of aggressive fluids commonly used in hydraulic applications. Caveat: Viton (FKM) is resistant to many hydraulic oils, fuels, solvents, and chemicals, but it is not universally compatible with all aggressive media (strong acids, certain amines, ketones like acetone, and some esters may cause degradation). For critical applications or where exposure to atypical or highly aggressive chemicals is possible, verify compatibility by checking the specific fluid’s chemical compatibility with Viton and the nickel-plated alloy steel, or consult NITTO KOHKI / material-data sheets to confirm suitability under your exact operating conditions (concentration, temperature, pressure, exposure duration).

Nickel-Plated Steel Quick Coupling Plug with BSP/BSPT Thread, 350 Series CUPLA, NITTO KOHKI

All products, Hydraulic quick couplings/

Additional information

Material	CS – steel (cast iron)

The NITTO KOHKI Series 350 CUPLA quick coupling plug with internal BSP and BSPT thread is a premium solution designed for demanding hydraulic applications. Engineered in Japan from high-grade nickel-plated alloy steel, it ensures exceptional durability, resistance to vibrations, and reliable performance under pulsating pressure conditions. Its advanced flat-face, leak-free design minimizes air inclusion, guaranteeing clean and efficient operation even in systems exposed to sudden pressure fluctuations, such as casting equipment. The coupling is user-friendly, allowing convenient one-hand operation, while its unique construction ensures that working pressure remains consistent regardless of size. With a wide operating temperature range from -20°C to +180°C, Viton sealing for superior chemical resistance, and a maximum working pressure of up to 345 bar, this coupling delivers outstanding reliability and safety. Optimized flow characteristics with a controlled pressure drop of 3 bar further enhance system efficiency, making it an ideal choice for professionals seeking long-lasting, high-performance hydraulic connections.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
NK-350-10P	Plug 350 CUPLA 1.1/2" with 1.1/4" BSPT thread, viton seal.	-	345	In stock	Enquiry
NK-350-12P	Plug 350 CUPLA 1.1/2" with 1.1/2" BSPT thread, viton seal.	-	345	In stock	Enquiry
NK-350-2P	Plug 350 CUPLA 1/4" with 1/4" BSPT thread, viton seal.	-	345	In stock	Enquiry
NK-350-3P	Plug 350 CUPLA 1/4" with 3/8" BSPT thread, viton seal	-	345	In stock	Enquiry
NK-350-3P-3G	Plug 350 CUPLA 1/4" with 3/8" BSP thread, viton seal.	-	345	In stock	Enquiry
NK-350-4P	Plug 350 CUPLA 1/2" with 1/2" BSPT thread, viton seal.	-	345	In stock	Enquiry
NK-350-4P-4G	Plug 350 CUPLA 1/2" with 1/2" BSP thread, viton seal.	-	345	In stock	Enquiry
NK-350-6P	Plug 350 CUPLA 3/4" with 3/4" BSPT thread, viton seal.	-	345	In stock	Enquiry
NK-350-6P-6G	Plug 350 CUPLA 3/4" with 3/4" BSP thread, viton seal.	-	345	In stock	Enquiry
NK-350-8P	Plug 350 CUPLA 1" with 1" BSPT female thread, viton seal.	-	345	In stock	Enquiry
NK-350-8P-8G	Plug 350 CUPLA 1" with 1" BSP female thread, viton seal.	-	345	In stock	Enquiry

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The NITTO KOHKI Series 350 CUPLA quick coupling plug with internal BSP and BSPT thread is a premium solution designed for demanding hydraulic applications. Engineered in Japan from high-grade nickel-plated alloy steel, it ensures exceptional durability, resistance to vibrations, and reliable performance under pulsating pressure conditions. Its advanced flat-face, leak-free design minimizes air inclusion, guaranteeing clean and efficient operation even in systems exposed to sudden pressure fluctuations, such as casting equipment. The coupling is user-friendly, allowing convenient one-hand operation, while its unique construction ensures that working pressure remains consistent regardless of size. With a wide operating temperature range from -20°C to +180°C, Viton sealing for superior chemical resistance, and a maximum working pressure of up to 345 bar, this coupling delivers outstanding reliability and safety. Optimized flow characteristics with a controlled pressure drop of 3 bar further enhance system efficiency, making it an ideal choice for professionals seeking long-lasting, high-performance hydraulic connections.