Is the Nickel-Plated Steel Quick Coupling Plug with BSPT Female Thread, HSP CUPLA Series, NITTO KOHKI compatible with hydraulic systems operating under vacuum?

Yes. The Nickel-Plated Steel Quick Coupling Plug with BSPT Female Thread, HSP CUPLA Series, NITTO KOHKI is compatible with hydraulic systems operating under vacuum. Its robust nickel-plated alloy steel construction is explicitly stated to allow safe operation under vacuum conditions, and the NBR sealing provides secure tightness and resistance to hydraulic oil. Additionally, the coupling’s design for vibration and pulsation resistance, wide operating temperature range (-20°C to +80°C) and high working pressure rating (up to 206 bar, size-dependent) further support reliable performance in vacuum-rated hydraulic applications.

Can the Nickel-Plated Steel Quick Coupling Plug with BSPT Female Thread, HSP CUPLA Series, NITTO KOHKI withstand continuous exposure to hydraulic oils and solvents without seal degradation?

Yes. The Nickel-Plated Steel Quick Coupling Plug with BSPT Female Thread, HSP CUPLA Series, NITTO KOHKI can withstand continuous exposure to hydraulic oils and many common solvents without seal degradation when used within its specified limits. Its NBR (nitrile rubber) sealing is explicitly stated to provide secure tightness and resistance to hydraulic oil, and the coupling is designed for demanding hydraulic applications (vibrations, pulsating pressure, vacuum) with an operating range of −20°C to +80°C and up to 206 bar working pressure (size-dependent). Limitations: NBR is generally resistant to mineral hydraulic oils but has limited compatibility with certain aggressive solvents, aromatic hydrocarbons, ketones, and some phosphate esters; prolonged exposure to such chemicals or temperatures outside −20°C…+80°C can cause swelling, hardening or loss of sealing performance. For continuous exposure to non-mineral oils or specific solvents, verify fluid compatibility with NBR or consider alternative seal materials.

Nickel-Plated Steel Quick Coupling Plug with BSPT Female Thread, HSP CUPLA Series, NITTO KOHKI

All products, Hydraulic quick couplings/

Additional information

Material	CS – steel (cast iron)

The NITTO KOHKI HSP CUPLA quick coupling with internal BSPT thread is a high-performance solution engineered in Japan from premium nickel-plated alloy steel, ensuring exceptional strength and long-lasting reliability. Designed to withstand vibrations and pulsating pressure, it delivers stable performance even in demanding hydraulic applications, such as casting equipment where sudden pressure fluctuations are common. Its robust construction allows safe operation under vacuum conditions, while the NBR sealing guarantees secure tightness and resistance to hydraulic oil. With an operating temperature range from -20°C to +80°C and a working pressure of up to 206 bar (depending on coupling size), this coupling provides outstanding versatility and efficiency. Optimized flow characteristics ensure minimal pressure drop of just 3 bar, making it an ideal choice for professionals seeking durability, precision, and consistent performance in hydraulic power systems.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
NK-10HP	HSP CUPLA plug with 1.1/4" BSPT thread, nickel-plated steel	-	180
NK-12HP	HSP CUPLA plug with 1.1/2" BSPT thread, nickel-plated steel	-	180
NK-16HP	HSP CUPLA plug with 2" BSPT female thread, nickel-plated steel	-	140
NK-2HP	HSP CUPLA plug with 1/4" BSPT thread, nickel-plated steel	-	206
NK-3HP	HSP CUPLA plug with 3/8" BSPT thread, nickel-plated steel	-	206
NK-4HP	HSP CUPLA plug with 1/2" BSPT thread, nickel-plated steel	-	206
NK-66HP	HSP CUPLA plug with 3/4" BSPT thread, nickel-plated steel	-	206
NK-6HP	HSP CUPLA plug with 3/4" BSPT thread, nickel-plated steel	-	206
NK-8HP	HSP CUPLA plug with 1" BSPT thread, nickel-plated steel	-	206

The NITTO KOHKI HSP CUPLA quick coupling with internal BSPT thread is a high-performance solution engineered in Japan from premium nickel-plated alloy steel, ensuring exceptional strength and long-lasting reliability. Designed to withstand vibrations and pulsating pressure, it delivers stable performance even in demanding hydraulic applications, such as casting equipment where sudden pressure fluctuations are common. Its robust construction allows safe operation under vacuum conditions, while the NBR sealing guarantees secure tightness and resistance to hydraulic oil. With an operating temperature range from -20°C to +80°C and a working pressure of up to 206 bar (depending on coupling size), this coupling provides outstanding versatility and efficiency. Optimized flow characteristics ensure minimal pressure drop of just 3 bar, making it an ideal choice for professionals seeking durability, precision, and consistent performance in hydraulic power systems.