Overview
Locking nuts are specialized fasteners engineered to resist loosening caused by vibration or dynamic loads. Unlike standard nuts, they incorporate design features such as nylon inserts, elliptical shapes, or flange bearings to increase friction and maintain tension. Widely used in automotive, aerospace, and heavy machinery, these nuts are critical for safety and reliability in high-stress applications. Chinese manufacturers like Zhongkuang Wuzi produce locking nuts that meet international standards such as DIN 985 and ISO 7040. These components are typically sold in bulk to industrial buyers, with customization options for thread size, material grade, and locking mechanism type.
Structure and Working Principle
A locking nut's anti-loosening capability stems from its unique structural adaptations. Nylon-insert nuts (e.g., Nyloc) use a polymer ring that deforms against the bolt threads, creating constant friction. All-metal designs may feature tapered threads or eccentric grooves that induce binding tension when tightened. Flange-type locking nuts integrate a serrated bearing surface that bites into the mating material, resisting rotation. The effectiveness depends on correct installation torque—typically 25-30% higher than standard nuts—to activate the locking mechanism without damaging threads. Industrial users should verify compatibility with existing bolt grades to prevent galvanic corrosion.
Key Features
Premium locking nuts offer vibration resistance up to 5,000 cycles under DIN 65151 testing standards. High-temperature variants use metallic locking elements (e.g., stainless steel inserts) for environments exceeding 250°C, while nylon-based types suit -40°C to 120°C ranges. Corrosion-resistant coatings like zinc-nickel plating or Dacromet treatment extend service life in harsh conditions. Buyers should note that reusable options (e.g., distorted thread nuts) maintain 70-80% effectiveness after multiple installations, whereas nylon inserts are typically single-use. Leading manufacturers provide certifications including RoHS and REACH compliance for global supply chains.
Application Areas
In automotive manufacturing, locking nuts secure critical components like wheel bearings, transmission mounts, and engine brackets. Aerospace applications require nuts with NASM 25027 or MS21042 specifications, often made from A286 stainless steel for fatigue resistance. Industrial machinery uses them in motor mounts, conveyor systems, and hydraulic pumps. Construction equipment employs large-diameter flange nuts for structural steel connections. Recent trends include lightweight aluminum alloys for electric vehicles and smart nuts with embedded sensors for tension monitoring in Industry 4.0 systems.
Maintenance and Precautions
Regular inspection should check for nylon insert degradation (cracking or hardening) or metal thread deformation. Re-torquing after initial 50-100 hours of operation is recommended for high-vibration setups. Avoid using thread-locking compounds with nylon inserts, as solvents may damage the polymer. For disassembly, heat above 120°C can melt nylon elements—use induction heaters cautiously. Storage should prevent moisture absorption in humidity-controlled environments, especially for unplated carbon steel variants prone to rust.
B2B Procurement Guide
Bulk purchases (1,000+ units) typically reduce costs by 15-30%. Request samples to test compatibility with your bolt inventory—key parameters include thread pitch (metric/imperial), proof load (e.g., 8.8 grade), and prevailing torque values. Leading Chinese suppliers offer MOQs from 5,000 pieces with 15-30 day lead times. For OEM projects, custom packaging (e.g., barcoded bags) and private labeling are negotiable. Verify supplier certifications like ISO 9001 and IATF 16949 for automotive applications. Sea freight is cost-effective for orders over 2 tons, while air shipping suits urgent small batches.
Related Manufacturers
- 主营：螺栓、螺钉、螺母、膨胀螺丝、化学锚栓、自攻钉、钻尾、牙棒、螺杆、注塑螺母、铜螺母、铜柱、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、门窗钻尾、防松螺母
- 主营：[]
- 主营：自攻螺丝、燕尾螺钉、圆形弹垫、自钻螺钉、螺母垫片、活节螺丝、螺栓螺丝、六角螺母、六角螺栓、法兰螺母、加大平垫、六角螺丝、法兰螺帽、化学锚栓、压板螺母、自钻螺丝、钻尾螺钉、拉铆螺母、导向螺钉、焊接螺栓、钻尾螺丝、螺栓垫片、双头螺栓、注塑螺栓、螺丝螺母
- 主营：预埋件、缩梗螺栓、扭剪螺栓、双头螺栓、预埋螺栓、大六角螺栓、全螺纹螺柱、高强度螺栓、双头螺纹螺栓、地脚螺栓
- 主营：k3给煤机、矿用风门、矿用支柱、中矿物资、锚杆钻机、调度绞车、气动闭锁、电缆桥架、煤矿单体、检验装置、dw单体液压、防水密闭门、玻璃钢电缆、气体测定器、玻璃钢格栅、防火密闭门、无损检测仪、履带挖掘机、避难硐室门、矿灯充电柜、玻璃钢复合、爆性测定仪、刮板输送机
- 主营：铆螺母、铆钉机、连接件、螺母枪、通体板、铆钉枪、紧固件、海马钉、单鼓铆钉、非标螺丝、六角螺母、铆接工具、灯笼铆钉、拉丝铆钉、镀锌螺钉、镀锌螺母、双锁铆钉、折叠灯笼、六角螺帽、开花拉钉、防松螺母、汽车铆钉、双鼓铆钉、实心铆钉、防腐螺帽
- 主营：法兰视镜、法兰对夹视镜、长条视镜、直通视镜、四通视镜、挖孔玻璃、防爆玻璃、高压锅炉、人孔常压、超白玻璃、人孔锅炉、人孔法兰、锅炉配件、玻璃视镜、球阀两片、压力视镜、法兰带刷、压力容器、球阀二片、丝扣球阀、快装球阀、条形视镜、人孔内开、接线端子、DN40丝扣管道视镜
- 主营：BOM铆钉、哈克铆钉、结构型铆钉、灯笼拉钉、拉丝铆钉、灯笼铆钉、抽芯铆钉、拉丝型铆钉、铝铁拉铆钉、不锈钢单鼓铆钉、双锁铆钉、口杯型铆钉、铆螺母、双鼓型铆钉、拉铆钉、拉钉、盲铆钉、环槽铆钉、铆钉枪、气动铆钉枪、铆螺母枪、电动铆钉枪
- 主营：软连接、单法兰、管接头、epdm橡胶、单球金属、防水套管、出口橡胶、管道变径、橡胶接头、密闭套管、橡胶弯头、预埋密闭、法兰橡胶、橡胶扣槽、耐酸碱橡胶、全密封橡胶、不锈钢橡胶、密闭通风管、橡胶减震器、大翻边橡胶、耐酸碱卡箍、柔性通风管、性防护密闭、密闭钢套管、球镀锌法兰
- 主营：预埋件、焊接螺丝、厂房电力铁塔、地脚螺栓、不锈钢薄螺母、镀铜焊接螺母、防松螺母、高强度螺母、家具锥形螺母、卡式螺母、盲孔压铆螺母螺柱、内外牙螺母、热镀锌螺母、台阶螺母、四爪螺母、外六角钻尾螺丝、304不锈钢喉箍、羊眼螺栓、T型螺丝、不锈钢方形卡箍、T型螺母、法兰带垫螺母、马车螺丝、外六角内膨胀螺丝、不锈钢弹垫垫圈
- 主营：钻尾丝、预埋板、防松螺母、膨胀螺丝、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、双头螺丝、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、外六角螺丝、高强度螺栓、钢结构拉条、热镀锌拉条
- 主营：不锈钢高强度紧固件、高温合金紧固件、低温合金紧固件、锁紧螺母、哈氏合金紧固件、钛合金紧固件、双相不锈钢紧固件
- 主营：螺栓、螺母、光伏、热镀锌、高强度、光伏配件
- 主营：高强度螺栓、预埋件、地脚螺栓、异形件
- 主营：不锈钢螺栓、不锈钢螺母、膨胀螺栓、光伏支架、钻尾丝、高强度螺栓、热镀锌螺栓、全螺纹丝杆
- 主营：圆柱销、止退垫、防松螺母、销轴卡簧、膨胀螺丝、轴承卡簧、镀锌丝杠、螺纹丝棒、薄头螺钉、开口挡圈、尼龙螺母、膨胀螺栓、吊环螺栓、花篮螺栓、弹性挡圈、工业齿条、法兰螺母、轴用卡簧、五金垫片、碳钢螺丝、六角铜螺母、热镀锌垫片、不锈钢平键、不锈钢牙条、钢丝绳卡头
- 主营：8.8级高强度外六角、10.9S钢结构螺栓、Q235B地脚螺栓、Q355B预埋锚栓、3米镀锌丝杆
- 主营：u型螺栓、方u型卡、单头螺栓、电缆挂钩、精轧垫板、异形钩子、9字地脚螺栓、高强度地脚螺栓、地脚螺栓、预埋钢板、双头螺栓、电缆支架、角钢支架、钻尾丝
- 主营：铝合金铆钉、六角螺栓、六角螺母、四方螺栓、方螺母、圆柱头螺丝、内六角螺丝、十字自攻、沉头螺丝、圆头螺钉、平垫、弹垫、梅花螺钉、非标螺丝、紧定、自攻螺丝、活节螺栓、T型螺丝、圆柱销、铆螺母、钻尾螺丝、挡圈、牙条、牙棒