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2-Hole Countersunk Self Tapping Security Screw

2 Hole Countersunk Head Security Self Tapping Screws

Vandal resistant 2-way security screws, with a unique 2 hole drive, are tamper-proof, reusable security fixings.

  • An aesthetic security solution
  • An economic secure solution
  • Low / medium security resistance
  • Reusable 2-way drive
  • Usable for lower torque applications

Tamper Resistant 2-hole countersunk head self tapping screws are available off the shelf in stainless steel with other sizes and materials available to order.

Gauge / Length (mm) 1/4″ (6.5) 3/8″ (9.5) 1/2″ (13) 5/8″ (16) 3/4″ (19) 1″ (25) 1 1/4″ (32) 1 1/2″ (38) 1 3/4″ (45) 2″ (50) 2 1/2″ (63)
No.4 (2.9mm)
No.6  (3.5mm)
No.8  (4.2mm)
No.10  (4.8mm)
No.12  (5.5mm)
No.14  (6.3mm)

2 hole Security Screw Features

The 2 Hole Security Screw has 2 holes drilled into the head, requiring a special insert bit to insert and remove.  These two holes can be drilled at different distances (between centres), therefore it is advisable to always purchase the screws and corresponding bits from the same supplier.

The security drive design of the vandal resistant tamper 2 Hole security screw makes it suitable for low to medium torque applications and is a 2 way reusable fixings making it an ideal medium security fastener for applications where maintenance is required.

The two pin drive is designed to offer some security whilst presenting an aesthetically pleasing finish. The 2 Hole security drive is more prone to cam-out than other security screws such as Pin Hex security screws.  

Users of 2 Hole security screws should be aware that when tightening the screw, the drive bits can be prone to bending or breaking after prolonged use, so we recommend purchasing additional drive bits for back up purposes.

The 2 Hole security screws are generally used in areas where aesthetics is more important than the security usually seen on trains or in public lifts.  Within the industry, they are also known as Snake Eye Screws, Pig Nose Security Screws, Two Pin and Spanner Drive Screws.

For more information and technical data regarding tamper resistant 2 Hole security products please call our sales team.

Note: Special 2 Hole Security Screws can be made to order including small volume manufacture, modifications and custom parts to drawings.

2 Hole countersunk self tapper technical drawing

No.4 No.6 No.8 No.10 No.12 No.14
DK (mm) 5.5 6.6 7.8 8.9 10.1 12.3
K (mm) 1.7 2.1 2.5 3.0 3.4 3.9
TOOL SIZE No.4 No.6 No.8 No.10 No.12 No.14

*For guidance purposes only

2 Hole Countersunk Self Tapping Security Screw