Clutch Head One Way Screws

Clutch head one way security screws are cleverly designed to provide a permanent fixing. Available in wing and pozidrive style formats, a standard cross head or flat bladescrewdriver (as appropriate) is used to install the screws which operate in a clockwise direction only.

Standard slot head (wing type) clutch head screws

Sentinel (posidrive head type) clutch head woodscrews

Clutch Head Security Screws are also known as 'One Way Screws' provide a permanent fixing yet can be installed using an ordinary screwdriver. In both pozidrive and slot wing formats, the head of the screw has a normal drive face and a chamfered rear face which prevents the screwdriver gaining any purchase when trying to undo the screws. Once installed therefore these screws will typically have to be drilled out to remove them.

Clutch Slot Head - Countersunk Woodscrews and Self Tappers
    Woodscrews available in BZP (bright zinc plate) finish (box quantity 200)
    Self-tapping screws are manufactured from A2 stainless steel (box quantity 100)

	Stock sizes as indicated belowWoodscrews Self Tappers
Length >	3/8"	1/2"	5/8"	3/4"	1"	1 1/4"	1 1/2"	2"	2 1/2"	3"
Gauge  mm	9.5 mm	13 mm	16 mm	19 mm	25 mm	32 mm	38 mm	50 mm	63 mm	76 mm
4 2.9 mm
6 3.5 mm
8 4.2 mm
104.8 mm
12 5.5 mm
14 6.3 mm

 
Sentinel Clutch Posidrive Head Countersunk Woodscrews (box quantity 200)
  Countersunk Posidrive Twinthread Woodscrews available in BZP (bright zinc plate) finish

	Stock sizes as indicated below Woodscrews
Length >	3/8"	1/2"	5/8"	3/4"	1"	1 1/4"	1 1/2"	2"	2 1/2"	3"
Gauge  mm	9.5 mm	13 mm	16 mm	19 mm	25 mm	32 mm	38 mm	50 mm	63 mm	76 mm
4 2.9 mm
6 3.5 mm
8 4.2 mm
104.8 mm
12 5.5 mm

Sentinel Clutch Posidrive Countersunk & Button Head machine screws (box quantity 100)
  Countersunk Machine screws are available in BZP (bright zinc plate) finish
  Button Head Machine screws are available in BZP (bright zinc plate) finish

	Stock sizes   Countersunk     Buttonhead
Length >	10 mm	12 mm	16 mm	20 mm	25 mm	30 mm	40 mm	50 mm
Gauge  mm
M4
M6
M6
M8

back to Security Screws and Fastenings index