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Clutch Head - Countersunk Twinthread Woodscrew - BZP Hardened Steel
The Clutch Head Screw is the original one way security screw, which is installed using a standard flat blade screwdriver and once installed cannot be easily removed.
Clutch Head Countersunk Twinthread Woodscrews are almost impossible to remove without drilling them out, making them a popular choice as a security screw for permanent installations.
Obviously, a two way screw such as one of our Security Torx screws would be a better choice if you think you may ever need to remove the screws again to release the item they are securing.
Other Security Clutch Head Screws available from stock -
Clutch Head Machine Screws -
Round Head Machine Screws
Clutch Head Wood Screws and Self Tapping Screws -
Countersunk Twin Thread Woodscrews
Countersunk Self Tapping Screws
Round Head Self Tapping Screws
Note: These one way screws are installed with a standard flat bladed screwdriver
A posidrive style clutch head screw is also available - see Sentinel Screws
...for other types of Security Fasteners - click on the individual links across the top of the page
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Step 3 - now select the size you need by clicking on the appropriate 'Eye' logo (stock items) below:
LENGTH
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
GAUGE
19mm)
25mm)
32mm)
38mm)
50mm)
63mm)
75mm)
6
(3.5
8
(4.2
10
(4.8
12
(5.5