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The High-Strength Penta Head Bolt is a specialized structural fastening solution designed to provide secure and reliable connections in demanding construction applications.
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The external pentagonal bolt is a specialized anti-theft fastener with an irregularly shaped pentagonal head, completely different from conventional internal pentagonal, internal hexagonal, and Phillips head screws. It achieves its anti-tamper function through the pentagonal shape of the bolt head and requires a dedicated external pentagonal socket tool for installation and removal. This product is forged from silicon bronze and other bronze materials in one piece, undergoing multiple precision processes including cold heading, precision thread rolling, hardening and tempering, and surface protection treatment. The overall structure is robust, the threads are precise, and the dimensional tolerances are small. The exposed external pentagonal design is suitable for various exposed installations, outdoor equipment, and public facility assembly scenarios, avoiding the drawbacks of internal pentagonal screws such as easy slippage, slippage, and inability to tighten with sufficient force. It also supports
standard national specifications and various non-standard sizes, special head shapes, extended shafts, and special plating customizations. It is widely applicable to security fastening scenarios in municipal security, transportation facilities, new energy equipment, outdoor engineering, and other fields, and is a core specialized accessory for anti-theft and anti-tampering of exposed industrial equipment.
Featuring an exposed, external pentagonal head design, this screw is impossible to engage with or disassemble using any common wrenches, sockets, or screwdrivers on the market. There are no universal replacement tools available, making its anti-theft and anti-tampering performance far superior to ordinary standard screws. Compared to internal pentagonal bolts, the external pentagonal structure has a larger stress area, is less prone to chipping, and less prone to slippage, making it extremely difficult to disassemble by force. This fundamentally prevents the unauthorized dismantling, malicious damage, and theft of parts from public equipment and outdoor facilities, providing superior equipment security.
Designed specifically for exposed installation conditions, the exposed bolt head engages with the tool, allowing it to withstand high torque tightening operations. It provides ample tightening force and a secure lock, completely resolving industry pain points such as the inability to fully tighten internal anti-theft screws, insufficient tightening, and equipment loosening. Suitable for various exposed assembly scenarios requiring high-strength tightening, high-frequency vibration, and harsh outdoor conditions, it offers convenient installation, even force distribution, and exceptional stability.
The product is manufactured using a solid, one-piece forging process, with no seams or weak points. Combined with quenching and tempering hardening treatment, it is available in different strength grades: 4.8, 8.8, 10.9, and 12.9, depending on requirements. The product is resistant to tension, shear, impact, and wear, and can withstand long-term outdoor exposure to wind, rain, salt spray corrosion, high-frequency vibration from equipment, and external impacts and pressure. It is not easily broken, deformed, or chipped, and its service life is significantly longer than that of ordinary anti-theft screws.
The fully automated precision thread rolling process produces full and regular thread profiles, uniform pitch, and no chipped, burr-free, or damaged threads. The thread engagement is precise and smooth, and repeated disassembly and assembly do not easily lead to stripping or wear. The external pentagonal head has high symmetry, regular edges and corners, and uniform dimensions. The tool engagement is tight and does not wobble, resulting in high assembly accuracy. It is suitable for industrial batch assembly and effectively improves the equipment's assembly qualification rate and stability.
We support full-dimensional non-standard customization services, and can customize parameters such as bolt diameter, total length, thread length, coarse/fine thread, head thickness, pentagonal outer diameter, surface treatment, hardness and strength as needed. We can tailor-make one-to-one according to customer drawings, samples and equipment conditions, without the need for secondary processing by customers, and directly adapt to various niche, special and precision industrial assembly scenarios.
External pentagonal anti-theft structure: Exclusive external pentagonal head shape, no universal disassembly tools required, maximum anti-disassembly, anti-theft, and anti-tampering performance, difficult to forcibly disassemble, and high level of security protection.
Solid one-piece forging quality: It is formed as a whole, with a dense structure without air holes, sand holes, or cracks. It has undergone strict hardness testing and tensile testing, with stable mechanical properties, strong load-bearing capacity, and is not easy to break.
High-precision thread technology: Precision rolling forming, consistent thread depth, tight engagement, and compliant tolerances. It is shock-resistant, prevents loosening, and locks firmly. It is not easy to loosen or fall off under long-term vibration conditions and is suitable for precision equipment assembly.
High-quality surface protection treatment: Supports various processes such as white zinc plating, color zinc plating, blackening, nickel plating, passivation and rust prevention. The surface is smooth and flat, free of oxidation black spots and rust. It is resistant to acids and alkalis, salt spray, and aging, and is suitable for long-term outdoor use.
Exclusive design for exposed installation: The head structure is prominent with ample interlocking space, providing high torque locking without slippage. It is compatible with all exposed installation points, does not hide holes or accumulate dust, and is easy to maintain and clean later.
All-condition adaptability: It has multiple characteristics such as high strength, rust prevention, wear resistance, shock resistance and impact resistance, and can be stably adapted to complex working conditions such as indoor precision equipment, outdoor open-air projects, vibrating machinery, and humid and corrosive conditions.
Leveraging the core advantages of external pentagonal bolts—high strength anti-theft, high torque locking, and outdoor durability—the product is precisely adapted to various exposed, public, and security-management-required assembly scenarios, covering multiple industry sectors:
Traffic safety facilities: Exposed and securely fastened road guardrails, traffic signs, traffic light brackets, monitoring poles, speed measuring equipment, and road warning facilities effectively prevent human dismantling and damage, ensuring the integrity and stability of traffic facilities.
Municipal outdoor engineering: municipal street lights, outdoor lighting fixtures, garden railings, public leisure facilities, outdoor signs and billboards, and urban steel structure fastening systems. These products are corrosion resistant, prevent unauthorized dismantling, and reduce municipal maintenance costs.
New energy and power equipment: charging pile shells, photovoltaic brackets, outdoor distribution boxes, power cabinets, and power transmission auxiliary accessories are exposed and assembled, which are anti-theft and anti-dismantling, and are suitable for complex outdoor working conditions such as high and low temperatures, wind and rain, and humidity.
Industrial automation equipment: large-scale production line equipment, outdoor industrial control equipment, large machinery housings, and external equipment brackets are secured with high strength, shock resistance, and anti-loosening features to adapt to long-term vibration conditions during equipment operation.
Security monitoring equipment: Outdoor camera brackets, PTZ camera bases, security fences, and security enclosures are secured with exposed screws to prevent unauthorized disassembly, relocation, or damage, ensuring the stable operation of the security equipment.
Special Equipment and Auto Parts: External accessories for large construction machinery, protective shells for special equipment, anti-theft fasteners for external structural components of new energy vehicles, high strength and durability, suitable for harsh industrial conditions.
Product Name: External Pentagonal Anti-theft Bolt, Exposed Pentagonal Special-shaped Screw, External Pentagonal Anti-tamper Fastener
Main materials: silicon bronze, etc.
Standard specifications/Thread standard: GB, ASME, DIN, etc.
Standard length: 10mm-200mm (custom lengths and lengths are available upon request)
Strength level: 4.8, 8.8, etc.
Key features: external five-corner anti-theft design, high torque locking, anti-loosening and shock-resistant, rust-proof and corrosion-resistant, and not prone to corner chipping.
Professional graded protective packaging: All external pentagonal bolts undergo manual sorting and dust removal quality inspection before leaving the factory to prevent defective products from being mixed in. The products are sealed in anti-static bags to prevent moisture and oxidation; thickened hard cardboard boxes with multiple layers of stretch film provide protection, and large orders are reinforced with solid wood pallets for packaging, effectively avoiding bumps and scratches on the edges and corners of the external pentagonal bolts, thread wear, and bolt deformation during transportation, ensuring that the product's appearance and precision remain intact.
Efficient Transportation Across Multiple Scenarios: Customized orders are tracked by dedicated personnel to ensure quality, quantity, and on-time delivery. We can adapt to various transportation methods such as express delivery, dedicated logistics, full truckload freight, and expedited delivery according to customer needs. This fully adapts to various procurement scenarios, including sample purchases, bulk orders, and project procurement, ensuring efficient delivery and traceable logistics throughout the entire process.
A municipal transportation engineering customer: "We've been purchasing these external pentagonal bolts for fixing road guardrails and road signs. Compared to internal pentagonal bolts, these external pentagonal ones are stronger. Even with heavy tightening, they won't chip or slip. They offer excellent anti-theft protection, virtually eliminating the possibility of unauthorized disassembly or damage. The outdoor galvanizing process makes them highly corrosion-resistant; they won't rust even after years of exposure to wind and rain. They are standardized, easy to install, and have stable bulk supply. They are a reliable fastener for municipal engineering projects."
A new energy equipment manufacturer: "These external pentagonal anti-theft bolts are specifically designed for charging pile equipment. The exposed installation perfectly matches our equipment structure, making them impossible to remove with ordinary tools, effectively preventing unauthorized disassembly and tampering. The bolts are highly durable, preventing loosening even under outdoor vibrations. The precision threads ensure smooth assembly." "Non-standard customized dimensions are precise, fully meeting mass production requirements."
A security monitoring purchaser stated: "External pentagonal bolts are the first choice for exposed points on monitoring brackets. They have a robust structure, a secure fit, and prevent stripping even under high torque. Their anti-theft performance far surpasses that of ordinary screws. The workmanship is meticulous, burr-free, and the surface coating is uniform and rust-proof. They do not deform or corrode even after long-term outdoor use. They offer high cost-effectiveness, and we have a long history of repurchases due to their stable quality."
A large machinery manufacturing customer said: "These external pentagonal bolts are excellent for external vibration-prone parts of equipment. The high-strength material is impact-resistant and not easily broken. The sturdy pentagonal head is durable and will not chip or break. Customized delivery is fast, and the high precision of the product greatly improves the overall safety and stability of the equipment."
