Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304

Q: Is the Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304 suitable for steam up to +180Â°C with Viton seals?

Yes . the Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304 is suitable for steam up to +180Â°C when fitted with Viton seals. The product specification explicitly lists steam among compatible media and shows an operating temperature range up to +180Â°C with Viton (vs. +80Â°C with NBR). Ensure the working pressure for your chosen size (75/45/30/20 bar depending on thread size) is compatible with your steam system pressure and consider system-specific factors (thermal cycling, condensate, pressure spikes) when installing.

Q: Can the Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304 handle corrosive chemicals at 75 bar?

Yes. with important conditions. Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304 is specified for use with water, hydraulic oils, steam, chemicals, air and gases and has a working pressure rating up to 75 bar for 1/8", 1/4" and 3/8" sizes. The AISI 304 stainless steel body offers good general corrosion resistance, and the couplingâs seals are available in NBR (â20Â°C to +80Â°C) or Viton (â20Â°C to +180Â°C), which affects chemical compatibility. Before using at 75 bar with corrosive chemicals you must verify: - Chemical compatibility of AISI 304 with the specific corrosive media (AISI 304 is not suitable for strong chlorides, strong acids, some halogenated solvents or wet chloride environments at elevated pressure/temperature). - Seal material compatibility: choose Viton for better resistance to many aggressive chemicals and higher temperatures; NBR is limited to less aggressive fluids and lower temperatures. - Selected size: only 1/8", 1/4" and 3/8" sizes are rated to 75 bar; larger sizes have lower working pressure limits. - Operating temperature and pressure combined effects: elevated temperature can reduce material and seal resistance. - Application specifics: concentration, presence of solids/abrasives, cyclic pressure, and safety factors. If the chemical is known and compatible with AISI 304 and the chosen seal (preferably Viton), and the coupling size is one of the 75-bar sizes, the Quick coupling socket with GW BSPT valve, NITTO KOHKI SP CUPLA type A, stainless steel AISI 304 can handle 75 bar. If compatibility is uncertain or the chemical is highly corrosive (e.g., strong chlorides, strong mineral acids), choose a more corrosion-resistant material (e.g., AISI 316L, duplex, Hastelloy) or consult Nitto Kohki / a corrosion specialist.

All products, General-purpose low-pressure quick couplings/

Additional information

Material	SS – stainless steel

Nitto Kohki series SP CUPLA type A socket with a shut-off valve and internal BSPT thread, featuring excellent durability, designed for water, hydraulic oils, steam, chemicals, air, and gases. Material: AISI 304 steel. Working pressure: 75 bar (1/8″, 1/4″, 3/8″), 45 bar (1/2″, 3/4″, 1″), 30 bar (1.1/4″, 1.1/2″), 20 bar (2″). Operating temperature: from -20°C to +80°C (NBR), from -20°C to +180°C (Viton).

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
NK-10S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 1.1/4", AISI 304	-	30
NK-12S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 1.1/2", AISI 304	-	30
NK-16S-A-SS	SP-A CUPLA quick coupling socket, 2" BSPT thread, AISI 304	-	20
NK-1S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 1/8" thread, AISI 304	-	75
NK-1S-A-SS-V	Quick coupling socket SP-A CUPLA, BSPT 1/8" thread, AISI 304, viton	-	75
NK-2S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 1/4" thread, AISI 304	-	75
NK-3S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 3/8" thread, AISI 304	-	75
NK-3S-A-SS-V	Quick coupling socket SP-A CUPLA, BSPT 3/8" thread, AISI 304, viton	-	75
NK-4S-A-SS	SP-A CUPLA quick coupling socket, BSPT 1/2" thread, AISI 304	-	45
NK-6S-A-SS	Quick coupling socket SP-A CUPLA, BSPT 3/4" thread, AISI 304	-	45
NK-6S-A-SS-V	Quick coupling socket SP-A CUPLA, BSPT 3/4", AISI 304, viton	-	45
NK-8S-A-SS	SP-A CUPLA quick coupling socket, BSPT 1" thread, AISI 304	-	45

Nitto Kohki series SP CUPLA type A socket with a shut-off valve and internal BSPT thread, featuring excellent durability, designed for water, hydraulic oils, steam, chemicals, air, and gases. Material: AISI 304 steel. Working pressure: 75 bar (1/8″, 1/4″, 3/8″), 45 bar (1/2″, 3/4″, 1″), 30 bar (1.1/4″, 1.1/2″), 20 bar (2″). Operating temperature: from -20°C to +80°C (NBR), from -20°C to +180°C (Viton).