THE INJURED EE WAS TIGHTENING UP A NUT ON A BOLTSO THAT A HEATER FLANGE COULD BE INSTALLED. THE HEATER FLANGE (WT-15 LBS) WAS ON A PORTABLE HYDRAULIC JACK. ANOTHER EE WAS AT THE CONTROLS PRE MATURELY LOWERED THE FLANGE, CRUSHING THE INJURED EE LEFT INDEX FINGER. FRACTURE & LACERATION THAT REQUIRED SUTURES TO CLOSE. NO LT, WORK LIMITATIONS ONLY.