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Hex socket flat countersunk head screws fully threaded

BN 21

DIN 7991

(Standard withdrawn)

~ISO 10642

~UNI 5933



Headform
Headform Countersunk head
Drive
Drive Hexagon socket
Thread
Thread fully threaded
Material
Material Steel
Property class
Property class 010.9 / 10.9 (The head marking is determining)
Surface
Surface zinc plated blue

Alla funktioner


Norm

DIN 7991 (Standard withdrawn) ~ISO 10642 ~UNI 5933

Mer information

Fasteners to the given specification have a reduced loadability due to the head geometry according to ISO 898-1.
The general change-over from DIN 7991 to ISO 10642 in the practice requires a verification of the application.

Funktioner

Headform
Headform Countersunk head
Drive
Drive Hexagon socket
Thread
Thread fully threaded
Material
Material Steel
Property class
Property class 010.9 / 10.9 (The head marking is determining)
Surface
Surface zinc plated blue

Warnings

ISO 4042
Quenched and tempered fasteners ≥ 360 HV and tempered case-hardened fasteners with electroplated coatings: Susceptible to hydrogen embrittlement!
Further notice to residual risks can be found on our web page: Notes on use