Description of Tamper Resistant Screws for the Engineers

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About Tamper Resistant Screws

Tamper Resistant Screws require specific tools to fasten and remove. Commercial screwdrivers and wrenches cannot fasten or remove these screws.
They are also referred to as anti-theft or tamper-proof screws.

Advantages of using of Tamper Resistant Screws

Tampering can be prevented by using our tamper resistant screws for situations in which only specific workers may alter equipment and screws.
They are also effective in theft prevention.

Examples of Use

For theft prevention

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Product Lineup

Theft Prevention Nuts

Theft Prevention Nuts can be easily fastened with commercially available tools. However, these nuts can only be removed with tools specific to this product. This allows a time-efficient fastening process even for high security applications.

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Flat Head Bolts with Hexalobular Socket (with Pin)

Use in combination with washers allows flat head bolts to be fastened without countersinking.
Even when trying to grasp the screw periphery with a special tool, the washer turns and prevents the screw from coming off.
As it comes with a pin, the bolt itself cannot be removed without a special tool, making it effective in tamper prevention.

Flat Head Bolts with Hexalobular Socket (with Pin)SRFXS
Rosette Washers SWAS-RW
Flat Head Bolts with Hexalobular Socket (with Pin) Rosette Washer Set SRFXS-SET

Captive Button Head Cap Bolts with Hexalobular Socket (with Pin)

Our tamper resistant captive screws prevent the falling-out and loss of screws.
They are designed to fix protective and inspection covers that are frequently installed and removed.

One Side Pan Head Machine Screws

Our One Side Pan Head Machine Screws can be fastened but not removed by commercially available flat head screwdrivers due to its peculiar head shape. To remove these screws, a dedicated tool is needed. These are also referred to as ‘one-way screws.’ One Side Pan Head Machine Screws are ideal for interlock devices.  See more details >

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Button Head Cap Screw with Three-Lobe Holes (with Pin)

Button head cap screws with pin at the center of the three groove holes.
Preventing mounting and removing with regular tools.

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Triangular Socket Button Head Cap Screw

Button head cap screws with triangular socket.
Preventing mounting and removing with regular tools.

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Triwing Flat Head Machine Screw

Preventing mounting and removing with regular tools.

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Hex Socket Flat Head Bolt (with Pin)

Flat head bolts with pin at the center of their socket.
Preventing mounting and removing with regular tools.

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Other Tamper Resistant Screws

Length Adjustment

Screws can be cut to your desired length in 1mm increments.






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Vibration Resistance

Anti-loosening treatments for screws are available. This is beneficial for applications requiring anti-loosening screw measures or sealing. Our anti-loosening treatments save you the trouble of applying adhesive or sealing tape.

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Cleanroom Services

We can wash and pack your products in a cleanroom. This is suggested for products used in FPD production devices, semiconductor manufacturing devices, medical equipment, food and beverage machinery and even products that will be used in cleanrooms.

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Sold by the Piece

Products from e-nedzi.com® are available in a fixed quantity per pack. We also accept orders by piece or in quantities of less than one pack.



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Captive Processing

Screws can be provided with relief cut and fall-out prevention functions originally designed to fix protective and inspection covers that are frequently installed and removed.


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