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2-Hole Truss Head Self Tapping Security Screw

2-Hole Truss Head Security Screws have two holes drilled into the head, which led to them also being known as Pig Nose or Snake Eye screws. They require a special insert bit for installation and removal.

The two holes can be drilled at different distances (between centres), therefore it is advisable to purchase the corresponding bits from the same supplier as the screws.

Suitable for low to medium torque applications, these reusable fixings have a low profile domed head and are difficult to remove without the special tool.

2-Hole Truss Head Security Screws are an ideal fastener for applications where maintenance is required, as the two-pin drive is designed to offer some security and also help in maintaining the aesthetics of the application it is used in. They may be 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 and should plan to purchase additional drive bits as backup.

They are suitable for use in areas where aesthetics are more important than security, such as trains or public lifts.

Please note that these two holes can be drilled at different distances (between centres), therefore it is always advisable to purchase the corresponding bits from the same supplier as the screws.

Non-standard sizes and materials are available to order as specials, including custom parts made to drawings.

2 Hole raised countersunk self tapper technical drawing

Metric Technical Information & Available Sizes
Thread Diameter No. 8 No. 10
dk (mm) 9.5 10.5
k (mm) 2.2 2.75
Tool Size No. 8 No. 10
Available Sizes No. 8 (4.2mm) No. 10 (4.8mm)
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1. 1/2″ (38mm) marker-image marker-image
2″ (50mm) marker-image
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Size not listed? Please make an enquiry – we may be able to provide it.

 

Imperial Available Sizes
  No.6 – 32 No.8 – 32 No.10 – 24 No.10 – 32 1/4″ – 20 5/6″ – 18 3/8″ – 16
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3. 1/2″ marker-image
black icon image = Available
Size not listed? Please make an enquiry – we may be able to provide it.

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