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
One-Way
This classic one-way design installs with a standard flathead but resists removal by camming out in reverse. It's low-cost, widely available, and simple to install—but also easy to defeat with pliers, extractor tools, or modified drivers. While it provides basic deterrence, it’s not suitable where determined tampering is a concern.
One-Way
- Low-Cost Deterrence
- Indoor Fixtures
- Short-Term Security
One-Way
- High-Security Installations
- Outdoor or Public Exposure
- Resistance to Basic Tools
One-Way
Widely available: One-way removal tools accessible to public.
One-Way
~85 in/lbs for 1/4-20x1
One-Way
Not specified; likely low (e.g., 100 pieces).
One-Way
Moderate: Removal possible with specialized tools.
One-Way
As low as $0.04
One-Way
Not Likely.
One-Way
One-way slotted drive.
One-Way
Minimal: Removal tools available to public.
One-Way
Button.
One-Way
Steel, stainless steel, brass.
One-Way
Non-reusable; one-way design.
One-Way
Moderate: One-way design resists casual tampering but not specialized tools.
One-Way
Compatible with one-way removal tools.
One-Way
Manual; one-way installation.
One-Way
Moderate: One-way drive signals tamper resistance.
One-Way
High: Removal tools increase risk.
One-Way
Not specified; Stock items ship quickly.
One-Way
