NI version - Stainless steel, European Standard No. 1.4301 (American Standard Series 304)
A4 version - Stainless steel, European Standard No. 1.4401 (American Standard Series 316)
AL version - Aluminum, weldable, 3.3206
Pin and washer: European Standard No. 1.4405 (American Standard Series 303)
Both dimensions, inch and metric, are interchangeable
GN 128 hinges are produced from drawn weldable profiled stainless
steel or aluminum extrusions.
The hinge pin is retained in the lower half.