Overview
Hexalobular socket screws, branded as Torx, feature a unique six-point star recess designed to maximize torque transfer and minimize driver slippage. Developed by Camcar Textron in 1967, they are now ISO-standardized (10664) and widely adopted in industries requiring high reliability. Unlike Phillips or slotted screws, their geometry distributes force evenly across the recess, reducing wear and tool damage. These screws are classified by size codes (e.g., T10, T25) and thread types (metric/imperial). Common materials include grade 8.8 carbon steel for general use and A2/A4 stainless steel for corrosive environments. Their tamper-resistant variants (Torx TR) feature a central pin for security applications.
Structure and Working Principle
The screw head contains a precisely machined six-lobed recess with 15° flank angles, creating greater surface contact with the driver bit. This design allows up to 10x higher torque transmission compared to Phillips screws while reducing radial forces that cause cam-out. Thread forms vary by application: coarse threads for soft materials (e.g., wood), fine threads for metal assemblies. The drive system's symmetry ensures balanced force distribution, preventing premature wear. Advanced versions include Torx Plus with shallower lobes for automated assembly and Torx Paralobe for extreme torque requirements.
Key Features
1. **Anti-Camout**: The 15° lobe angle prevents driver disengagement under high torque, critical for power tools and production lines. 2. **Durability**: Hardened steel variants (e.g., grade 12.9) withstand over 1,000 N·m of torque without recess deformation. 3. **Versatility**: Available in sizes from T1 (0.81mm) to T100 (25mm), with head styles including flat, pan, and button. Tamper-resistant models deter unauthorized access, while self-drilling types combine drilling and fastening in one operation. Corrosion-resistant coatings like zinc-nickel extend service life in harsh environments.
Application Areas
1. **Automotive**: Engine components, brake systems (e.g., BMW uses Torx exclusively for critical assemblies). 2. **Electronics**: Smartphone and laptop housings (Apple mandates T2–T8 sizes for repairability). 3. **Aerospace**: FAA-approved titanium Torx screws in airframe structures. Industrial machinery relies on large-format Torx (T30–T55) for bearing retention. Consumer applications include furniture (IKEA uses T15/T20) and bicycles. The medical sector prefers stainless Torx for MRI-compatible devices due to non-magnetic properties.
Maintenance and Precautions
Always use certified Torx bits matching the screw size – mismatched tools cause irreversible recess damage. For stuck screws, apply penetrating oil and use impact drivers with precisely fitted bits. Inspect screws for lobe rounding before reuse in critical assemblies. Storage should be in dry conditions; stainless variants may require anti-galling compounds during installation. When disassembling, apply steady axial pressure to maintain bit engagement. Tamper-resistant screws require specialized TR drivers – conventional bits will shear the security pin.
B2B Procurement Guide
1. **Specification Checklist**: Define thread (M3–M24), length (5–200mm), head style, and material (e.g., A2-70 stainless). 2. **Certifications**: ISO 10664 compliance is mandatory for aerospace/defense; RoHS for electronics. 3. **MOQ**: Standard sizes often have 1,000-unit MOQs; custom orders require 10,000+ units. Leading manufacturers include Würth, Bossard, and ITW Shakeproof. Bulk pricing breaks: 10,000 units at ~$0.08 (carbon steel T20). For OEM contracts, request hardness testing reports and salt spray test data (e.g., 500+ hours for outdoor use).
Related Manufacturers
- 主营：防水盖片、屋脊气楼、排烟天窗、标的螺钉、自钻螺钉、自攻螺钉、丁基不干胶、防水透汽膜、通风气楼、通风器、丁基胶带
- 主营：钻尾丝、预埋板、防松螺母、膨胀螺丝、双头螺丝、外六角螺丝、蓝白丝杠、六角螺母、花瓣螺母、光伏支架、法兰螺栓、法兰螺母、化学锚栓、膨胀螺栓、电力金具、弹簧垫片、地脚螺栓、一体盖母、扭剪螺栓、激光割板、抗震支架、钢结构螺栓、高强度螺栓、钢结构拉条、热镀锌拉条
- 主营：304不锈钢螺栓、2205不锈钢螺栓、310S不锈钢螺栓、304不锈钢螺丝、2205不锈钢螺丝、310S不锈钢螺丝、316不锈钢螺丝、热镀锌螺丝、达克罗螺丝、316不锈钢螺栓、304不锈钢螺母、热镀锌螺栓
- 主营：螺母、螺栓、垫圈、螺钉、铆钉、组合螺丝、自攻螺丝、钻尾螺丝、紧定螺丝、膨胀螺丝、螺丝钉、销轴、螺柱、牙条、挡圈、机械零件、索具、弹簧、车床加工
- 主营：外六角螺丝
- 主营：倒角器、扳手架、调压阀、梅花螺丝、打结刀、磨光机、电磁阀、测量仪、切管器、搅拌机、覆膜机、角磨机、电动机、打磨机、测亩仪、风速仪、割纱刀、热熔胶、减压阀、轴承座、铁皮剪、电链锯、干磨机、高速电机、电动球阀、铜管割刀
- 主营：非标螺栓、球拍螺栓、双头螺栓、球拍螺丝、非标螺丝、异形螺丝、家具螺丝、活接螺丝、手拧螺丝、母指螺丝、双头螺丝、马车螺丝、自攻螺丝、异形铆钉、台阶螺栓、法兰螺栓、四方螺栓、非标连接件、六角螺母、非标冷镦件、鱼眼垫圈
- 主营：焊接螺丝、预埋件、厂房电力铁塔
- 主营：六角螺栓、六角螺母、平垫、三组合螺钉、不锈钢螺丝、304 螺丝、内六角螺丝、弹垫、十字沉头
- 主营：六角螺栓、六角螺母、四方螺栓、铝合金铆钉、圆柱头螺丝、内六角螺丝、沉头螺丝、圆头螺钉、梅花螺钉、非标螺丝、自攻螺丝、T型螺丝、钻尾螺丝、方螺母、十字自攻、平垫、弹垫、紧定、活节螺栓、圆柱销、铆螺母、挡圈、牙条、牙棒
- 主营：达克罗螺丝、不锈钢螺栓、热镀锌螺栓
- 主营：复合螺丝、钻尾螺丝、涂层螺丝、螺丝垫片、自钻螺丝、梅花螺丝、跨标螺丝、十字螺丝、防腐螺丝、碳钢螺丝、不锈钢螺丝、六角缝合钉、盘头内梅花钻尾、复合钻尾
- 主营：不锈钢外六角螺栓、不锈钢双头螺栓、不锈钢六角钻尾丝、不锈钢内六角、轮毂螺栓、地脚螺栓等产品
- 主营：不锈钢螺栓、不锈钢车削件、不锈钢冲压件、盘头内六角、不锈钢原材料、不锈钢非标件、不锈钢折弯件、护舷预埋件、双头螺栓、U型螺栓
- 主营：纤维板、连接柱、摄像机、螺丝帽、木螺钉、螺丝柱、螺丝钉、具螺丝、自攻螺丝、沉头螺丝、木工螺钉、六角螺丝、电子螺钉、自攻螺钉、平头螺丝、塑料螺丝、平头螺栓、手拧螺母、六角铜柱、六角螺母、六角螺栓、螺栓螺帽、蝶形螺母、弹簧垫片、法兰螺母