Overview
Threadlocking screws with adhesive are engineered fasteners that address the persistent challenge of bolt loosening in mechanical systems. Unlike traditional locking methods like washers or nylon inserts, these screws incorporate a pre-applied adhesive compound (typically anaerobic) on their threads. When installed, the adhesive fills microscopic gaps between mating threads and cures into a tough plastic when deprived of oxygen, creating a chemical bond that resists vibrational forces. First developed for aerospace applications in the 1960s, these screws now see widespread industrial use where vibration or thermal cycling could compromise fastener integrity. Their effectiveness stems from combining mechanical thread engagement with adhesive bonding, offering superior performance compared to either method alone. Modern variants may include color-coded adhesives indicating different strength grades.
Structure and Working Principle
The screw's structure follows standard thread geometry (e.g., metric, UNC, or UNF) but includes precisely applied adhesive dots or stripes near the thread crests. Common adhesive placement patterns include 3-5 discrete dots spaced evenly around the circumference or continuous helical stripes. The adhesive remains inert until assembly, when thread engagement excludes oxygen and metal ions act as catalysts for polymerization. Anaerobic adhesives used in these screws cure within 10-30 minutes at room temperature, achieving full strength in 24 hours. Cured adhesive typically withstands temperatures from -55°C to 150°C while maintaining shear strengths of 10-25 MPa. Some premium formulations incorporate micro-encapsulated adhesive that activates only during installation, extending shelf life to 2-3 years compared to standard 1-year shelf life of exposed adhesive versions.
Key Features
Three primary features distinguish adhesive threadlocking screws from conventional fasteners. First, their vibration resistance outperforms mechanical locking methods, with testing showing 3-5 times greater resistance to self-loosening under ASTM D4724 vibration tests. Second, they distribute locking force evenly across all threads rather than concentrating stress at specific points like nylon insert locks. Third, these screws provide consistent locking performance regardless of surface finish variations, unlike friction-based methods. Additional advantages include inherent corrosion protection from the adhesive seal and elimination of loose locking components. However, they generally permit only one-time use and may require heat (>250°C) or special solvents for disassembly after curing.
Application Areas
Automotive manufacturers extensively use medium-strength versions (e.g., blue adhesive) for engine components, transmission housings, and chassis parts subject to constant vibration. Aerospace applications favor high-temperature variants (red/purple adhesives) for turbine components and airframe assemblies, where failure could be catastrophic. Industrial equipment applications include pump couplings, compressor assemblies, and heavy machinery where thermal cycling occurs. Electronics manufacturers employ low-strength formulations (green adhesive) for delicate components requiring occasional servicing. Emerging applications include wind turbine assemblies and high-speed rail components, where their maintenance-free reliability proves invaluable in hard-to-access locations.
Maintenance and Precautions
Proper installation requires careful torque control - under-tightening may prevent adhesive activation, while over-tightening can shear the uncured adhesive. Manufacturers typically recommend tightening to 75-90% of standard torque values, allowing the final 10-25% to develop through adhesive curing. Thread cleanliness is critical; oil or debris exceeding 5% coverage can reduce bond strength by 30-50%. For disassembly, gradual heating to 150-200°C softens most adhesives without damaging threads. Some formulations require specialized removers containing nitromethane or diketones. Reinstallation should use new screws, as residual adhesive compromises the bond strength of reused fasteners by approximately 60%. Storage should avoid high humidity and temperatures above 35°C to prevent premature adhesive degradation.
B2B Procurement Guide
Industrial buyers should specify four key parameters: adhesive strength grade (commonly low/medium/high, corresponding to disassembly torque requirements), environmental resistance (temperature range, chemical exposure), screw material/coating compatibility (some adhesives react poorly with zinc or cadmium platings), and cure speed requirements. Batch testing is advisable for critical applications - reputable suppliers provide samples for vibration testing per DIN 65151 or similar standards. MOQs typically start at 10,000 units for standard sizes, with lead times of 4-8 weeks for custom adhesive formulations. Cost-saving opportunities exist in bulk purchases of popular sizes (e.g., M6-M10 in steel), while small quantities of specialized variants (e.g., titanium screws with high-temp adhesive) may carry 100-300% premiums.
Related Manufacturers
- 主营：螺栓、螺钉、螺母、膨胀螺丝、幕墙螺丝、不锈钢螺丝、高强度螺丝、组合螺丝、螺丝、化学螺丝、三组合螺丝、防松螺母、化学锚栓、自攻钉、钻尾、牙棒、螺杆、注塑螺母、铜螺母、铜柱、门窗钻尾
- 主营：[]
- 主营：[]
- 主营：高强度螺栓、全螺纹螺柱、地脚螺栓、预埋钢板、预埋件、热镀锌拉条、镀锌拉条、栓钉、剪力钉、双头螺栓、螺栓、螺母、高强度螺母、焊板地脚螺栓
- 主营：高强度螺栓、预埋件、地脚螺栓、异形件
- 主营：不锈钢管片螺栓、不锈钢螺栓、管片螺栓、螺丝锚栓、地脚螺栓、预埋件、外六角螺栓、螺母 不锈钢螺母、光伏配件、抗震配件
- 主营：螺母、螺栓、螺钉、组合螺丝、自攻螺丝、钻尾螺丝、紧定螺丝、膨胀螺丝、螺丝钉、垫圈、铆钉、销轴、螺柱、牙条、挡圈、机械零件、索具、弹簧、车床加工
- 主营：铝合金铆钉、六角螺栓、六角螺母、圆柱头螺丝、内六角螺丝、沉头螺丝、非标螺丝、自攻螺丝、T型螺丝、钻尾螺丝、四方螺栓、方螺母、十字自攻、圆头螺钉、平垫、弹垫、梅花螺钉、紧定、活节螺栓、圆柱销、铆螺母、挡圈、牙条、牙棒
- 主营：高精密微型螺丝、非标螺丝定制、防水螺丝、点胶防松螺丝、特殊异型槽螺丝、CD纹螺丝、松不脱螺丝、子母工字螺丝、台阶螺丝、自攻螺丝、端子螺丝、手拧螺丝、铅封螺丝、铜螺丝定制、彩锌螺丝定制、防盗螺丝、烤漆螺丝、薄头螺丝、达克罗螺丝、组合螺丝、钛螺丝、真空螺丝、PVC塑木地板螺丝、甲板螺丝、螺母定制
- 主营：cnc数控、车床件、内六角、自攻螺丝、螺丝平头、电脑螺丝、烤漆螺丝、法兰螺丝、螺丝黄铜、对锁螺丝、沉头螺丝、膨胀螺丝、螺丝订做、五金车、led配件、羊角螺帽、轴芯零件、盖帽螺母、不锈钢带、六角螺母、铝车削件、注塑螺母、四方螺母、数控车床、固定插销
- 主营：三组合螺钉、六角螺栓、六角螺母、不锈钢螺丝、304 螺丝、内六角螺丝、平垫、弹垫、十字沉头
- 主营：螺母、紧固件、冲压件、螺丝、螺丝钉、自攻螺丝、特殊螺丝、非标螺丝、螺丝螺母、螺帽、弹簧、垫片、车床件
- 主营：钛螺丝、长螺丝、不锈钢螺丝、非标螺丝、台阶螺丝、机米螺丝
- 主营：组合螺栓、外六角螺栓、外六角组合件、外六角组合螺丝、外六角组合套装
- 主营：耐落涂胶、耐落胶、预涂胶、点胶螺丝、螺丝止退、螺丝防松涂胶、铆螺母涂胶
- 主营：DIN936外六角点胶螺丝、外六角螺钉
- 主营：内六角螺栓、外六角螺栓、沉头内六角螺栓、自攻螺丝、钻尾自攻螺丝、十字自攻螺丝、碳钢螺丝、黄铜螺丝、圆头内六角螺栓、高强度螺栓、法兰螺栓、304不锈钢、尼龙隔离柱、六角螺柱、法兰螺母、膨胀锚栓、T型螺母
- 主营：内六角螺丝、三组合螺丝、外六角螺丝、不锈钢螺丝、圆柱头、钻尾钉