Killark HKBX-GLC - Compact round body instrument enclosures with threaded glass lens screw covers provide easy access to interior. High strength, lighter weight, corrosion resistant copper free cast aluminum construction. Glass lens made of tempered sode lime. Cover o-ring, Nitrile (BUNA-N) material, supplied standard supplied standard for a Type 4X rating. Cast mounting lugs are standard on all boxes. Internal ground screw supplied on all boxes. Electrostatically applied gray powder epoxy/polyester finish on exterior of box and covers. Offset feed-thru conduit openings (3/4” NPT) for maximum use of interior volume. Interior "X”-configuration mounting pad for instrument/device cast into the bottom of the box provided for flexibility. Covers have shrouded tamper resistant set screws as standard. Small compact, 4-1/4 ID. round body enclosure with a 2-3/4" depth. Option of 2 threaded lens covers and 2 blank threaded cover in 2 depths. The HBX series is for use in locations that are hazardous, corrosive, wet, hose down, dust, dirty, under both sever hot and cold ambient conditions. They are UL / CSA certified for Class I Groups BCD, Class I Zone 1 & 2 IIB+H2, Class II Groups EFG, Class III, Type 4 & 4X. Also, ATEX, IEC Ex, Ex db IIC, Ex e IIC, Ex tb IIIC T4…T3 IP66 with suffix “C”. Supplied with (3) ¾”NPT conduit openings, additional openings are available. HKBX series is made of die cast copper-free aluminum (less than 4/10 of 1%), supplied standard with a Nitrile (BUNA-N) O-Ring, internal external ground (earth) screws, stainless steel tamper proof locking set screw and electrostatically applied grey powder paint. Internal “X” pad for mounting instruments or terminals.