Security Fastener
Our Thoughts
Good For
Not Good For
Driver Availability
Maximum Torque (MFG Claim)
Minimum Quantity
Average Break-In Time
Cost Per Fastener
Samples Available
Keyway Type
Tool Control
Head Style Options
Material Options
Reusability
Tamper Resistance
Tool Compatibility
Installation Method
Visual Deterrence Level
Removal Risk if Tool Leaks
Lead Time to Purchase
Where to Buy
Kinmar Permanent by Hafren Security Fasteners
The Kinmar Permanent screw is a true one-way fastener designed for permanent installations where no future access is needed. Its unique shape makes unauthorized removal extremely difficult without specialized tooling or destruction. However, its broad, flat top offers limited resistance to physical attacks like grinding or gripping tools. The overall security relies more on deterrence than invulnerability.
Kinmar Permanent
- Permanent Fixtures
- Low-Maintenance Installations
- Visual Deterrence
Kinmar Permanent
- Applications Requiring Maintenance
- High-Tool Exposure Environments
- Resistance to Physical Destruction
Kinmar Permanent
None: One-way design, no driver for removal.
Kinmar Permanent
Not specified; high torque before shearing.
Kinmar Permanent
Not specified; likely moderate (e.g., 100 pieces).
Kinmar Permanent
Extremely high: Permanent, resists all removal attempts.
Kinmar Permanent
$1.62 - $5.35
Kinmar Permanent
Not specified; likely available for bulk orders.
Kinmar Permanent
One-way keyway, shears after installation.
Kinmar Permanent
None: Permanent design, no removal tools.
Kinmar Permanent
Button.
Kinmar Permanent
Steel, stainless steel; A2, A4 options.
Kinmar Permanent
Non-reusable; permanent installation.
Kinmar Permanent
Extremely high: One-way design prevents removal.
Kinmar Permanent
No tools for removal; one-way design.
Kinmar Permanent
Manual or power-driven; shears after installation.
Kinmar Permanent
High: One-way design signals permanence.
Kinmar Permanent
None: No removal tools exist.
Kinmar Permanent
Not specified; likely 1–4 weeks.
Kinmar Permanent
Snake-Eye
This fastener is widely available and lacks meaningful tool control or tamper resistance. While often marketed as a "security screw," it does not meet our standards for the security classification. It may deter casual tampering but offers very little protection against intentional removal.
Snake-Eye
Widely available; sold in stores and online.
Snake-Eye
~70 in/lbs for 1/4-20x1
Snake-Eye
Low: Often available in small packs.
Snake-Eye
Low: Easily removed in minutes.
Snake-Eye
Low: Varies by supplier, size, and material.
Snake-Eye
Likely available from distributors.
Snake-Eye
Standard, not proprietary.
Snake-Eye
N/A: Bits widely available to public.
Snake-Eye
Button, flat, pan, socket; varies by supplier.
Snake-Eye
Steel, stainless steel (e.g., 304, 316), sometimes brass or zinc-plated—depends on supplier.
Snake-Eye
Reusable with matching bit; integrity depends on torque and material.
Snake-Eye
Low: Easily defeated with standard bits or modified tools.
Snake-Eye
Compatible with standard bits; widely available tools.
Snake-Eye
Manual or power-driven with bit; standard installation process.
Snake-Eye
Low: Recognizable shape signals basic security, not highly deterrent.
Snake-Eye
N/A: Tool/Bit is widely available.
Snake-Eye
N/A: Commonly stocked item.
Snake-Eye
