Can the JIC plug with stainless steel UNF GW, type VKA (AISI 316) be used with fluids at temperatures above 200Â°C without compromising the internal 37Â° cone seal?

Short answer: No . not recommended without further verification. Explanation: The JIC plug with stainless steel UNF GW, type VKA (AISI 316) is designed to seal on the internal 37Â° cone using metal-to-metal contact. AISI 316 retains strength at elevated temperatures, but at temperatures above ~200Â°C several factors can compromise the 37Â° cone seal: - Thermal expansion mismatch between plug and mating components can change contact pressure and seating geometry, reducing seal integrity. - Softening, creep or stress relaxation of any mating material or components (e.g., housings, sealing faces) at high temperature can allow deformation under preload and vibration. - Surface oxides and scaling form more readily above 200Â°C, increasing roughness and preventing full metal-to-metal contact. - If any secondary sealing element (coating, washer, or elastomeric backup) is present, it likely will degrade above 200Â°C. - Elevated temperatures accelerate galling for stainless steels under high contact stress, risking damage to the 37Â° cone during assembly/disassembly. Recommendation: For service above 200Â°C, perform a validated compatibility assessment: check mating material specifications, confirm acceptable thermal expansion and strength at temperature, consider using high-temperature alloys or hard-faced/sealed variants, and perform pressure-temperature testing and leak verification. If in doubt, consult the manufacturer for high-temperature approval or select a plug/seal system specifically rated for >200Â°C.

Is JIC plug with stainless steel UNF GW, type VKA compatible with welding or brazing during assembly without damaging the internal 37Â° cone seal?

No. JIC plug with stainless steel UNF GW, type VKA should not be welded or brazed during assembly in contact with the internal 37Â° cone seal. AISI 316 can tolerate high temperatures, but welding or brazing risks heat distortion, metallurgical changes, and contamination (oxidation, carbide precipitation) that can alter the precise 37Â° conical surface and sealing fit, causing leaks. If welding/brazing is unavoidable, protect the cone: mask off the internal cone, use low-heat processes, apply inert gas shielding, and perform post-weld machining and surface inspection to restore the 37Â° seal geometry and finish. Best practice: assemble using proper mechanical methods or repair the cone by qualified machining rather than welding/brazing in place.

Does JIC plug with stainless steel UNF GW, type VKA resist corrosion in seawater or chloride-rich environments?

Limited resistance. not fully reliable for long-term exposure in seawater or chloride-rich environments. Explanation: A JIC plug with stainless steel UNF GW, type VKA Format made from AISI 316 offers good general corrosion resistance and performs significantly better than ferritic or lower-alloy steels in many environments because of its molybdenum content, which improves pitting and crevice corrosion resistance. However, AISI 316 is susceptible to localized corrosion (pitting and crevice corrosion) in aggressive chloride environments such as seawater, especially at elevated temperatures, in stagnant zones, or where oxygen diffusion is limited. Factors affecting suitability: - Chloride concentration and temperature: Higher chloride levels and temperatures increase risk of pitting. - Flow and oxygenation: Stagnant or poorly oxygenated crevices (threads, underheads, joints) promote crevice corrosion. - Surface condition and contaminants: Rough surfaces, embedded salts, or weld heat tint reduce resistance. - Mechanical stresses: Tensile or residual stresses can promote stress corrosion cracking in chlorides. - Threaded/plug geometry: Internal threads and mating surfaces create crevices that are high-risk locations. Recommendations: - For intermittent or splash exposure and well-oxygenated, moderate chloride environments, AISI 316 may be acceptable with regular inspection. - For continuous immersion in seawater, splash zones, or critical/long-term service, specify higher-alloy materials (e.g., duplex stainless steels, 316LCL, 904L, or nickel alloys) or apply protective measures (coatings, cathodic protection, corrosion inhibitors). - Consider design changes to minimize crevices, use proper cleaning/passivation, and implement routine inspection and maintenance. Conclusion: A JIC plug with stainless steel UNF GW, type VKA Format made of AISI 316 has improved corrosion resistance over plain steels but is not the best choice for prolonged exposure to seawater or chloride-rich environments without additional protections or higher-alloy alternatives.

Plug JIC with UNF female of stainless steel, type VKA

Additional information

Material	SS – stainless steel

Plug JIC 37° with UNF female thread (sealing on the internal 37° cone). Material: AISI 316.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HJ-VKA-07-SS	Plug with female JIC 7/16"-20, AISI 316	-	450	In stock	Enquiry
HJ-VKA-08-SS	Plug with female JIC 1/2"-20, AISI 316	-	350	In stock	Enquiry
HJ-VKA-09-SS	Plug with female JIC 9/16"-18, AISI 316	-	350	In stock	Enquiry
HJ-VKA-12-SS	Plug with female JIC 3/4"-16, AISI 316	-	350	In stock	Enquiry
HJ-VKA-14-SS	Plug with female JIC 7/8"-14, AISI 316	-	350	In stock	Enquiry
HJ-VKA-17-SS	Plug with female JIC 1.1/16"-12, AISI 316	-	350	In stock	Enquiry
HJ-VKA-21-SS	Plug with female JIC 1.5/16"-12, AISI 316	-	290	In stock	Enquiry
HJ-VKA-26-SS	Plug with female JIC 1.5/8"-12, AISI 316	-	240	In stock	Enquiry
HJ-VKA-30-SS	Plug with female JIC 1.7/8"-12, AISI 316	-	240	In stock	Enquiry