Bolts
Anti-Theft / Security Bolt
Accurate Fastners supplies cold forged anti-theft security bolts in stainless steel grades SS 202, SS 304 and SS 316, covering diameters M6 to M12 and lengths from 10 mm to 100 mm. The tamper-resistant head design is intended to limit unauthorised removal in public, commercial and industrial installations.
- Standard
- —
- Grades
- 304 / 316 / 202
- Size
- M6 – M12
- Length
- 10 mm – 100 mm
Overview
What is the Anti-Theft / Security Bolt?
An anti-theft or security bolt is a threaded fastener engineered specifically to resist removal by standard tools. Unlike conventional hex or socket bolts, the head geometry is designed so that common spanners, Allen keys or screwdrivers cannot engage with it effectively. This characteristic makes them a practical choice wherever unauthorised disassembly, vandalism or pilferage is a concern, such as public infrastructure, enclosures, panels and equipment housings.
Accurate Fastners produces these bolts by cold forging, a process in which the head and shank are formed under pressure at ambient temperature rather than being machined from bar stock. Cold forging refines the grain structure of the stainless steel, which may contribute to improved mechanical consistency across the fastener body. The metric thread is formed to suit standard nuts and threaded inserts, and the tamper-resistant security head requires a matching proprietary driver for installation and, when intended, for controlled removal.
The available size range of M6 to M12 in diameter and 10 mm to 100 mm in length gives specifiers flexibility across a variety of joint thicknesses and clamping requirements. Three stainless steel grades—SS 202, SS 304 and SS 316—are offered, allowing selection to reflect the corrosion demands of the installation environment. Accurate Fastners has supplied fastener products for over 21 years from its base in Ahmedabad, Gujarat, serving both domestic and international customers across several industrial sectors.
In Depth
Product description
Construction & Geometry
Each bolt is cold forged from stainless steel bar, producing a one-piece shank and head without welded or assembled components. The shank carries a metric thread compatible with standard nuts, inserts and tapped holes within the M6 to M12 diameter range. Lengths from 10 mm to 100 mm accommodate a broad spread of grip lengths and countersunk or through-hole configurations.
The defining feature is the tamper-resistant security head profile. This head form does not accept a conventional hexagon spanner, open-ended wrench or standard socket. Installation and intentional removal require a matching proprietary bit or key, which limits opportunistic interference. The cold forging process aligns the material grain along the fastener axis, which is generally associated with good structural consistency in the finished bolt.
Functional Behaviour in an Assembly
In a bolted joint, a security bolt functions identically to a conventional fastener in terms of clamping load and thread engagement. The distinction lies solely in access control: once tightened with the appropriate driver, the head offers no practical grip surface to standard hand tools. This makes the joint resistant to casual removal while remaining serviceable by authorised personnel who hold the matching driver.
Because the metric thread is standard, the bolt may be paired with ordinary stainless steel nuts, washers or threaded inserts already present in an assembly. The tamper resistance is therefore concentrated at the head rather than requiring any modification to the mating components. Specifiers should verify that the driver bit for the chosen head pattern is readily available to maintenance personnel to avoid access difficulties during authorised servicing.
How It Differs from Similar Fasteners
A conventional hex bolt and a security bolt share the same thread form and clamping function; the head is the sole point of difference. Standard bolts prioritise universal tool access, whereas the security bolt intentionally restricts it. This places security bolts in a different category from tamper-evident fasteners, which show visible signs of attempted removal but do not actively resist it.
Security bolts also differ from break-away or shear bolts, where the drive feature fractures after installation to make removal permanently impractical. The bolts supplied by Accurate Fastners retain a functional head that authorised drivers can engage, making them suitable for applications requiring periodic maintenance access under controlled conditions, rather than permanent, irreversible fastening.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
Accurate Fastners offers these security bolts in SS 202, SS 304 and SS 316. SS 202 is an austenitic grade with a lower nickel content than SS 304, and is commonly used in less aggressive environments where cost efficiency is a consideration. SS 304, often regarded as a general-purpose austenitic stainless steel, offers broad resistance to atmospheric corrosion and is widely used across food, pharmaceutical and general industrial applications.
SS 316 contains molybdenum, which typically enhances resistance to chloride-containing environments compared with SS 304, making it a common choice for coastal, marine-influenced or chemically demanding installations. Selection among the three grades should be based on the specific environmental exposure, cleaning regimes and service life requirements of the application. The Accurate Fastners sales team can assist in confirming the most appropriate grade for a given installation condition.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Bolt – Anti-Theft / Security Bolt |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Nominal diameter / size | M6 – M12 |
| Length | 10 mm – 100 mm |
| Thread type | Metric |
| Head / form | Tamper-resistant security head |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M6 – M12
Documented length range
10 mm – 100 mm
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Energy Installations
Mounting panels and structural frames on rooftops or open land can be vulnerable to theft. Security bolts in SS 304 or SS 316 may help restrict unauthorised dismantling of solar array support structures and junction enclosures.
Food & Beverage Processing Equipment
Hygienic enclosures, guards and access panels on processing lines may require fasteners that limit casual removal. Stainless steel security bolts support access control without introducing corrosion risk into a washdown environment.
Pharmaceutical Machinery
Equipment housings and control panel covers in pharmaceutical facilities benefit from restricted access. Security bolts help ensure that only authorised maintenance personnel can open machine guards or enclosures during production cycles.
LED Lighting Structures
Street and architectural LED luminaire housings mounted in public spaces may be targeted for vandalism. Stainless steel security bolts on fixture covers and mounting brackets can reduce opportunistic disassembly in outdoor settings.
RO Water Purifier Units
Enclosures and service panels on commercial or industrial water purification systems may require access control. Security bolts help ensure that internal components remain accessible only to trained service personnel.
Features & Selection
Features and selection considerations
Design features
Tamper-Resistant Head
The proprietary head profile does not accept standard spanners, hex keys or screwdrivers, meaning that removal requires a matching driver held by authorised personnel, limiting opportunistic interference.
Cold Forged Construction
Forming by cold forging rather than machining refines the grain structure of the stainless steel throughout the shank and head, which may contribute to consistent mechanical properties across the bolt.
Standard Metric Thread
The metric thread form is compatible with conventional nuts, washers and tapped inserts, so no special mating components are needed; tamper resistance is confined entirely to the head geometry.
Three Stainless Steel Grades
Availability in SS 202, SS 304 and SS 316 allows specifiers to match the grade to the corrosion demands of the environment, from general indoor use to more aggressive atmospheric or chemical conditions.
Wide Size Range
Diameters from M6 to M12 and lengths from 10 mm to 100 mm provide flexibility across a variety of joint thicknesses, panel materials and clamping length requirements within a single product family.
Before you order
Grade & Environment
Choose SS 202 for dry or mildly humid indoor settings, SS 304 for general outdoor or washdown environments, and SS 316 where chloride exposure or chemical contact is anticipated. Confirm grade suitability with the Accurate Fastners team.
Diameter & Length
Select diameter (M6–M12) based on the load, joint material and tapped hole specification. Length (10–100 mm) should account for total grip thickness plus sufficient thread engagement in the nut or insert to achieve the required clamping.
Driver Bit Availability
Confirm that the matching proprietary driver for the chosen head pattern will be available to your maintenance team before ordering. Without the correct bit, authorised servicing becomes impractical and may create unintended access difficulties.
Mating Components & Documentation
Identify whether standard stainless steel nuts and washers of matching grade are required. For procurement records, note the grade, diameter, length and head type on your purchase order to ensure accurate supply and traceability at delivery.
FAQs
Frequently asked questions
What makes a security bolt different from a standard bolt?
The only structural difference is the head geometry. A security bolt uses a proprietary head profile that standard spanners or keys cannot engage, whereas the shank and metric thread are identical in function to those of a conventional bolt. Removal requires a matching proprietary driver.
Which stainless steel grades are available for these security bolts?
Accurate Fastners offers anti-theft security bolts in SS 202, SS 304 and SS 316. Each grade has different corrosion-resistance characteristics; the most suitable grade depends on the operating environment. The sales team can advise based on your specific installation conditions.
What sizes are available?
Security bolts are available in diameters from M6 to M12 and lengths from 10 mm to 100 mm. If your project requires a size outside this range or a specific combination, please contact the Accurate Fastners team directly to discuss options.
Do these bolts conform to any published standard?
Accurate Fastners' fastener range is manufactured in compliance with standards including IS, BS and DIN where applicable. Whether a specific published standard governs a particular security head pattern should be confirmed with the sales team at the time of enquiry, as head geometries may vary.
Can I use standard nuts and washers with these bolts?
Yes. The metric thread on these security bolts is standard, so they are compatible with ordinary stainless steel nuts and washers of the corresponding size and grade. Tamper resistance applies only to the bolt head and does not affect the mating thread components.
How can I request a quotation?
You may request a quotation by completing the enquiry form on the Accurate Fastners website, sending details by email to export@accuratefastners.com, or contacting the team directly via WhatsApp. Please include grade, diameter, length, head type and required quantity for an accurate and prompt response.
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