Hex socket flat countersunk head screws fully threaded

BN 21

DIN 7991

(Standard withdrawn)

~ISO 10642

~UNI 5933

Headform	Headform Countersunk head 90°
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

All features

Product variants

Features

DIN 7991 (Standard withdrawn) ~ISO 10642 ~UNI 5933

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.

Headform	Headform Countersunk head 90°
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

CAD-Download

Alternative products

BN 1422 - DIN 7991 - ~ISO 10642

Hex socket flat countersunk head screws fully threaded - Steel - 010.9 / 10.9 (The head marking is determining) - Zinc flake coated ISO 10683/flZnL/nc/480h/C (µ=0.12-0.18)

BN 2102 - ISO 10642 - ~DIN 7991

Hex socket flat countersunk head screws fully threaded - Steel - 010.9 / 10.9 (The head marking is determining) - zinc plated blue

BN 2103 - ISO 10642 - ~DIN 7991

Hex socket flat countersunk head screws fully threaded - Steel - 010.9 / 10.9 (The head marking is determining) - Zinc flake coated ISO 10683/flZnL/nc/480h/C (µ=0.12-0.18)