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2-Hole Raised Countersunk Security Machine Screw

2 hole raised countersunk security machine screws

Typically used in the electrical trade, these tamper resistant machine screws are ideal for use in access control panels, prisons, hospitals, mental health facilities, schools, trains, lifts and other public areas.

  • Pig nose security screws – 2 holes drilled into screw head
  • Tamper resistant screw with aesthetic appearance
  • Low / medium security resistance
  • Reusable fixing using special insert bit

The screw’s design makes it suitable for low to medium torque applications and is a reusable fixing, ideal for applications where maintenance is required.
Within the industry 2 Hole security screws are also referred to by other names including Snake Eye, Pig Nose, Two Pin and Spanner Drive Screws.

Pig nose machine screws can be used with Security Wave Nuts, Shear Nuts, Kinmar Reusable Nuts, Kinmar Permanent Nuts, 4-Hole Nuts or Pin Torx Barrel Nuts for added security.

2-hole screws installation guidance

The two holes can be drilled at different distances between centres, so we advise purchasing the screws and corresponding bits / drivers from the same supplier.

2-hole screws are more prone to cam-out than other security screws such as Pin Hex security screws. Users should also be aware that when tightening the screw the drive bits are prone to bending or breaking after prolonged use, so we recommend purchasing additional drive bits as backup.

Machine screws, supplied from stock in A2 stainless steel, other sizes and materials to order.

Special 2-hole security screws can be made to order including small volume manufacture, modifications and custom parts to drawings.

Thread / Length (mm) 12 25 30 40 50
M3.5 Pllaceholder image Placeholder image Placeholder image Placeholder image Placeholder image

2 Hole raised countersunk technical drawing

DK (mm) K (mm) Tool Size
M3.5 6.4 1.9 No.6

*For guidance purposes only

2 Hole Raised Countersunk Security Screws for the Electrical Industry