Kinmar® Bolt - M8 x 40mm Permanent Bolt - Galv

Permanent Kinmar® Security Bolts - High Security Anti-Tamper Bolts | One-Way Security Fixings | Vital Parts - KINMAR-P-M8-40-GEO

Introducing Permanent Kinmar® Security Bolts, engineered to deliver the ultimate in tamper-proof security for critical applications across the UK. They work using a drive system that is only able to be tightened in one direction, creating a secure and permanent fixture. The drive system that allows secure tightening using specialised tools but prevents removal once installed.  Designed for permanent installation, these anti-theft boltsfeature a unique  making them the ideal choice for valuable outdoor equipment, safety-critical installations, and high-risk environments where unauthorised tampering poses significant security concerns.

What are Permanent Kinmar® Security Bolts?

Permanent Kinmar® security bolts represent the pinnacle of tamper-proof fastening technology, designed specifically for applications requiring the highest level of security protection. Unlike conventional fixings that can be easily removed with standard tools, these patented security fixings incorporate a sophisticated one-way clutch mechanism that permits installation and re-torquing using matching driver sockets but prevents unauthorised removal. The innovative design eliminates the vulnerabilities associated with traditional shear bolts by providing operator-controlled torque settings without creating unplated surfaces or rough edges that could compromise the finish or structural integrity. Each nut features precision-engineered drive patterns that engage exclusively with proprietary tools, ensuring that once properly installed, the fastening becomes permanently secure against tampering attempts.

Please note that to preserve the integrity of our security products, the relevant tooling is not available online.

It is available by request, and only to registered businesses.

Key Applications and Industries:

• Public Infrastructure Security: Essential for securing street lighting columns, traffic signals, highway signage, and electrical street furniture where unauthorised access could compromise public safety or create liability issues.
• Electric Vehicle Charging Points: Protecting valuable EV charging infrastructure from theft and vandalism, particularly in unsupervised outdoor locations where equipment represents significant investment.
• Solar Panel Installations: Preventing theft of expensive solar panels and mounting hardware, providing long-term security for renewable energy installations on commercial and residential properties.
• Public Realm Furniture: Securing benches, playground equipment, handrails, and safety barriers in parks, schools, and public spaces where safety-critical fixings must remain tamper-proof.
• Transport Infrastructure: Railway platforms, bus stations, underground facilities, and transport hubs where security nuts prevent unauthorised modification of safety-critical installations.

Why Choose Our Permanent Kinmar® Security Bolts?

Uncompromising Security: The patented one-way mechanism ensures that once installed, removal becomes virtually impossible even with the correct tooling, providing permanent protection against theft and tampering.

Superior Torque Control: Unlike shear nuts with predetermined breaking points, operators maintain full control over installation torque, ensuring optimal fastening strength whilst preserving the integrity of the protective coating.

Professional Finish: Clean, smooth surfaces with no protruding elements or rough edges make these nuts suitable for public areas where safety and aesthetics are paramount considerations.

Advanced Materials: Available in corrosion-resistant A2 stainless steel for marine environments, zinc-plated hardened steel for general applications, and Geomet coating for extreme weather resistance with up to 1000 hours salt spray protection.

Restricted Tooling Access: Matching driver sockets are exclusively available to purchasers of Kinmar® products, maintaining the security integrity of the system by preventing unauthorised tool acquisition.

Key Features and Benefits:

• Matching nuts available
• Patented one-way clutch design prevents removal even with correct tooling once properly torqued
• Available in multiple thread sizes from M5 to M12 to suit diverse applications
• Choice of premium finishes: A2 stainless steel, bright zinc plated, and Geomet 500 coating
• Operator-controlled torque settings eliminate shear point limitations and coating damage
• Smooth, professional finish suitable for high-visibility public installations

Target Market and Users:

Permanent Kinmar® security bolts are primarily utilised by professional contractors, local authorities, facilities managers, and security specialists throughout the UK who require guaranteed tamper-proof fastening solutions. Key purchasers include electrical contractors installing street lighting and EV charging infrastructure, construction companies working on public realm projects, renewable energy installers securing solar panel systems, and maintenance teams responsible for transport hubs and critical infrastructure. These nuts are particularly valued by procurement professionals in local government, utilities companies, and facilities management organisations who specify security fasteners for high-value assets in accessible locations where conventional fixings would present unacceptable security risks.

What materials and finishes are available?

Bright Zinc Plated (CR-3): Case hardened steel with electroplated zinc finish providing bright silver appearance and reliable corrosion protection. Salt spray testing demonstrates 6 hours white rust resistance and 48 hours red rust protection, suitable for most standard applications.

Geomet 500 Coating: Advanced zinc-aluminium coating delivering superior corrosion protection comparable to heavy galvanising but with smoother, more consistent application. Provides exceptional durability with 240 hours white rust resistance and 1000 hours red rust protection in salt spray testing.

Product Specifications:

• Thread Size: M8
• Length: 40mm
• Head Diameter: 16.1mm
• Head Height: 7.3mm
• Material: Hardened Steel - Galvanised

fasteners provide the definitive solution for permanent, tamper-proof fixings. The combination of advanced materials, precision engineering, and restricted tooling access makes these nuts the preferred choice for security-conscious professionals throughout the UK.

Why Buy from Vital Parts? 

As a trusted UK supplier of high-quality fasteners and industrial components, Vital Parts offers a customer-first experience with benefits that include: 

• Same-Day Dispatch: Fast and reliable shipping to keep your projects on track. 

• Competitive Trade Pricing: Enjoy bulk discounts on larger orders to save more. 

• Expert Technical Support: Our knowledgeable team is here to help with product selection and application advice. 

If you need assistance selecting the right size or would like to discuss custom options, contact our expert team at 01233 713581.