Features:
* Twin ferrule fittings provide metal- to- metal seal connections, non- elastomeric seals for leak- free connections
* Hikelok twin ferrule fittings is designed to have a maximum allowable working pressure that is higher than that of any tubing 
* Industry standard design for all instrumentation grade tubing
* Stainless steel tube hardness: the hardness of the tube shall be not greater than 85 HRB
* Available in sizes from 1/16 to 2 in. and 2 mm to 50 mm
* Hikelok fittings materials include 316 stainless steel, steel, brass, aluminum, nickel- copper, Hastelloy C, 6Mo, Incoloy 625 and 825
* Hikelok special treated back ferrule is to provide secure
* Silver coated threads to reduce galling
* Leak- proof joints capable of satisfying high pressure vacuum and vibration applications

Performance:
* Hydraulic proof pressure test (1.5 times the maximum permissible working pressure): no leakage
* Dismantling and reassembly test (dismantle ten times): no leakage
* Minimum hydrostatic pressure test (4 times the maximum permissible ambient pressure rating): no leakage
* Vacuum test (1 x 10^-4Mbar or greater ): the leak rate less than 1 x 10^-8 mbar/s
* Maximum static gas pressure test ( with nitrogen gas to 150% of pressure rating): no visible bubbles
* Hydraulic impulse and vibration test ( the pressure impulses at between 0.5 Hz and 1.7 Hz and the vibration at between 23 Hz and 47 Hz): no leakage
* Thermal cycle test (ambient to +80℃ and then to -25℃ with a hydrostatic pressure): no evidence of leakage
* Pneumatic pressure vibration test ( the frequency of vibration shall be set at 45 Hz and complete 20 x 10⁶Cycles): without failure 
* Fire test  (in accordance with BS ISO 19921): no leakage
* Corrosion resistance test ( the duration of exposure at least 168 h): no visible evidence of corrosion
* Deep water submersion test (equivalent to 3048m of sea water): no helium detected