Specializing in the production of special precision screws and nuts of various standards such as Chinese standard GB, Japanese standard JIS, British BS, American ANSI and ISO.
At present, the smallest screw diameter that our company can produce is 0.4mm, the shortest is 0.4mm, and the longest is 300CM.
2025-06-28 16:13:09
The Torx screw system, developed by Camcar Textron in 1967, represents a significant advancement in fastener technology with its unique 6-point star-shaped pattern. Officially standardized as ISO 10664 and DIN 7500, Torx screws offer superior torque transmission compared to traditional Phillips or slotted screw designs.
Torx screws are characterized by several precise engineering specifications that distinguish them from other fastener types:
| Parameter | Specification |
|---|---|
| Drive Type | 6-point star pattern with 15° radial angle |
| Standard Sizes | T1 to T100 (common range T5-T50) |
| Torque Capacity | 20-30% greater than equivalent Phillips head |
| Material Hardness | Typically HRC 28-32 for standard steel variants |
| Thread Pitch | Varies by size (e.g., T20 commonly uses M4x0.7 thread) |
| Head Styles | Flat, pan, button, socket, and security (Tamper-Resistant) variants |
The critical dimensional relationship between the screw size (T-number) and actual measurements follows strict tolerances. For example, a T25 screw has a point-to-point diameter of 4.43 mm (±0.05 mm) and a maximum chamfer diameter of 4.70 mm. The depth of the recess typically measures 2.36 mm for standard sizes.
Torx screws exhibit several superior performance characteristics:
Torque Transmission: The 6-point contact distributes force evenly, allowing torque values up to 10 Nm for a T30 screw in steel applications.
Cam-out Resistance: The 15° flank angle prevents driver slippage, maintaining engagement at torque levels where Phillips screws would typically fail.
Precision Fit: Manufacturing tolerances of ±0.05 mm ensure consistent engagement with properly sized drivers.
Material Efficiency: The design allows for smaller head diameters compared to hex drives - typically 1.5 times the shank diameter versus 2.0 times for hex.
The unique characteristics of Torx screws make them ideal for numerous professional and industrial applications:
Automotive Manufacturing: Used extensively in engine components (valve covers at 8-12 Nm), transmission assemblies, and electronic control units where vibration resistance is critical. BMW and Mercedes-Benz specify Torx for over 60% of their fastener applications.
Aerospace: Titanium Torx screws (NASM21200 series) secure composite panels in aircraft with torque values precisely calibrated to 0.5 Nm increments.
Electronics: Miniature Torx (T3-T10) secure smartphone components, with Apple using pentalobe security variants in their iPhone assemblies.
Industrial Machinery: High-torque applications up to 150 Nm use Torx Plus variants (T40-T55) in heavy equipment.
Medical Devices: Stainless steel Torx screws (ASTM F138 compliant) assemble surgical instruments requiring frequent sterilization.
Proper maintenance ensures optimal performance and longevity of Torx fastening systems:
Tool Selection: Always use precisely sized Torx drivers - a T25 driver should measure 4.43 mm across points. Worn tools increase stripping risk by 300%.
Cleaning: Remove debris from screw heads using compressed air (60-80 psi) or nylon brushes. For corrosion, apply penetrating oil (WD-40 or equivalent) 15 miNutes before removal.
Lubrication: Apply thread locker (Loctite 242 for medium strength) or anti-seize compound (nickel-based for high temps >800°F) as appropriate for the application.
Torque Control: Use calibrated torque wrenches set to manufacturer specifications (typically 75% of proof load for steel fasteners).
Inspection: Check for worn drive features using optical comparators - replace screws showing >10% deformation in the star pattern.
Storage: Keep screws in controlled environments (30-50% RH) with VCI paper to prevent corrosion of unprotected steel variants.
The Torx system has evolved to meet specific technical requirements:
| Variant | Key Feature | Application |
|---|---|---|
| Torx Plus | Flatter 12° sidewalls, 20% higher torque | Automotive suspension components |
| Security Torx | Center post prevents standard driver engagement | Public infrastructure, vending machines |
| Torx Paralobe | Asymmetric lobes for one-way assembly | Military equipment |
| Torx TTAP | Combined Torx and hex drive | Emergency service vehicles |
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