Art.no.: W251100VZ820
Böllhoff standard 251 | Steel | Strength class 100 | zinc-plated | Cr (VI) - free | metric thread
The RIPP LOCK® self-locking screws are reliable fasteners for securing screw connections against loosening. The preload force is maintained even under high dynamic loads. With RIPP LOCK®, the screws have a special mechanical securing effect against automatic loosening of the connection. This is created by radial ribs that act on the component over the entire contact surface. During assembly, the radial ribs are impressed into the respective mating part by the applied preload force. The resulting form fit prevents the connection from turning loose. Additional safety devices, washers and lock washers are not required. The component surface of even sensitive materials is protected.
Advantages:
• Reliable anti-rotation device
• Preservation of the preload force even under high dynamic loads
• Saves washers, spring washers or other additional safety devices
The RIPP LOCK® self-locking screws are reliable fasteners for securing screw connections against loosening. The preload force is maintained even under high dynamic loads. With RIPP LOCK®, the screws have a special mechanical securing effect against automatic loosening of the connection. This is created by radial ribs that act on the component over the entire contact surface. During assembly, the radial ribs are impressed into the respective mating part by the applied preload force. The resulting form fit prevents the connection from turning loose. Additional safety devices, washers and lock washers are not required. The component surface of even sensitive materials is protected.
Advantages:
• Reliable anti-rotation device
• Preservation of the preload force even under high dynamic loads
• Saves washers, spring washers or other additional safety devices
Dimension: M8 x 20
a max.:
3,75
b:
28
Diameter (d):
M8
d2 max.:
9,4
d2 min.:
9,2
dc max.:
17
dc min.:
16
dk max.:
14
dk min.:
13
e min.:
6,86
ECLASS 7.1:
23110629
k max.:
8
k min.:
7,64
Length (l):
20
l max. A:
20,42
l min. A:
19,58
Material:
Steel
DIN/ISO:
B 251
Surface:
zinc-plated
Pitch (P):
1,25
s:
6
s max.:
6,14
s min.:
6,02
Packaging unit (pcs.):
200
Tool size:
SW 6
Cr(VI) Note:
Cr(VI)-free
Flange/washer:
with flange
Risk hydrogen embrittlement:
Thread type:
Metric thread
Head shape:
Cylinder head with flange
Force application:
Hexagon socket
Installation method:
Screw into place with tool
Application:
Joining by bolt, joining by screw
Product type:
Cap screw with internal driving feature
Product group:
Screws
RoHS conformal:
Material:
Steel
Fastening and assembly technology: Products and services
The Manual of fastening Technology: 8th edition
Böllhoff bulletin: Changeover to Cr6+-free protective zinc layers for fasteners
RIPP LOCK® screw lock: Efficient and secure
