PARTS FOR HIGH-STRENGTH STRUCTURAL BOLTING

Standard reference	Material	Hardness range
EN 14399-6	carbon steel	HV 300÷370
UNI 5716/DIN 6918	carbon steel	HV 300÷370
UNI 6598/DIN 434	steel	HV 100÷250
DIN 7989-1	steel	HV 100÷250
DIN 7349	steel	t<=6 HV 200÷300
DIN 7967	spring steel	HV 350÷425