Hex socket flat countersunk head screws fully threaded
BN 21
DIN 7991 (Standard withdrawn)
~ISO 10642
~UNI 5933
| Headform |
Headform
Countersunk
|
| Drive |
Drive
Hexagon socket
|
| Thread |
Thread
fully threaded
|
All features
Additional 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.
The general change-over from DIN 7991 to ISO 10642 in the practice requires a verification of the application.
Features
| Headform |
Headform
Countersunk
|
| Drive |
Drive
Hexagon socket
|
| Thread |
Thread
fully threaded
|
| Material |
Material
Steel
|
| Strength class |
Strength 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 in the introduction section.
BN 1422 - DIN 7991 (Standard withdrawn)
Hex socket flat countersunk head screws fully threaded - Steel - 010.9 / 10.9 (The head marking is determining) - zinc flake coated
BN 2102 - ISO 10642
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
Hex socket flat countersunk head screws fully threaded - Steel - 010.9/10.9 (The head marking is determining) - zinc flake coated GEOMET® 500 A