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2-Hole Countersunk Security Machine Screw

These reusable security screws have a unique two-hole system, where two holes are drilled into the head – requiring a special insert bit to insert and remove the screws.

Ideal for low to medium torque applications and the fact that it is reusable makes it a great security fastener for applications where regular maintenance is required.

The two-pin drive is designed mainly to offer some security but also to maintain the aesthetics of the application that it has been used within.

More prone to cam-out than other security screws such as Pin Torx or 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 back-ups.

Tamper-resistant 2 Hole Security screws offer a medium security resistance against vandals and thieves at a relatively low cost, proving an economic and secure equilibrium.

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

Tamper Resistant 2 Hole 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.

Available in A2 Stainless Steel and A4 Stainless Steel from Fastenright, with both Metric and Imperial sizes available.

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

2 Hole Countersunk Machine Screw Technical Drawing

Metric Technical Information & Available Sizes
Thread Diameter M3 M3.5 M4 M5 M6
dk (mm) 6.0 6.6 8.4 10.4 12.4
k (mm) 1.75 1.9 2.4 2.95 3.45
Tool Size No. 4 No. 6 No. 8 No. 10 No. 14
Available Sizes M3 M3.5 M4 M5 M6
6mm marker-image marker-image marker-image marker-image
8mm marker-image marker-image marker-image marker-image
10mm marker-image marker-image marker-image marker-image marker-image
12mm marker-image marker-image marker-image marker-image marker-image
16mm marker-image marker-image marker-image marker-image marker-image
20mm marker-image marker-image marker-image marker-image marker-image
25mm marker-image marker-image marker-image marker-image marker-image
30mm marker-image marker-image marker-image marker-image marker-image
35mm marker-image marker-image marker-image marker-image
40mm marker-image marker-image marker-image marker-image
45mm marker-image marker-image marker-image marker-image
50mm marker-image marker-image marker-image marker-image marker-image
black icon image = Available
Size not listed? Please make an enquiry – we may be able to provide it.

 

Imperial Available Sizes
No.4 – 40 No.6 – 32 No.8 – 32 No.10 – 24 No.10 – 32 No.12 – 24 1/4″ – 20 1/4″ – 28 5/16″ – 18 3/8″ – 16
3/16″
1/4″ yellow triangle icon image
5/16″ yellow triangle icon image
3/8″ yellow triangle icon image yellow triangle icon image yellow triangle icon image yellow triangle icon image
1/2″ yellow triangle icon image yellow triangle icon image yellow triangle icon image yellow triangle icon image yellow triangle icon image
5/8″
7/8″
3/4″ yellow triangle icon image yellow triangle icon image yellow triangle icon image yellow triangle icon image
1″ yellow triangle icon image yellow triangle icon image yellow triangle icon image yellow triangle icon image
1. 1/4″ yellow triangle icon image yellow triangle icon image yellow triangle icon image
1. 1/2″ yellow triangle icon image yellow triangle icon image yellow triangle icon image
1. 3/4″ yellow triangle icon image
2″ yellow triangle icon image
2. 1/8″
2. 1/4″
2. 1/2″
3″
4″
= Stainless Steel // yellow triangle icon image = Brass
Size not listed? Please make an enquiry – we may be able to provide it.

2 Hole Countersunk Security Screw

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