Dome Nut
Overview
A dome nut is a specialized fastener featuring a rounded, closed top that covers the end of a threaded bolt. It combines functionality with safety and aesthetics, often used in applications where exposed threads could pose hazards or detract from visual appeal. Also called acorn nuts or cap nuts, these components are standardized under metrics like DIN 1587 or ASME B18.2.2. Their design eliminates sharp edges, making them ideal for furniture, automotive interiors, and public infrastructure.
Structure and Working Principle
Dome nuts consist of two primary parts: a hexagonal base for tool engagement (e.g., wrenches) and a spherical cap that encloses the bolt tip. The internal threads match standard bolt sizes, typically ranging from M3 to M24 in metric or #4–1" in imperial. When tightened, the nut’s dome compresses against the bolt’s end, creating a flush surface. Nylon variants may include a built-in washer to enhance vibration resistance, while metal types rely on thread-locking compounds if needed.
Key Features
The domed design prevents injury from protruding bolt ends, a critical feature in high-traffic areas like playgrounds or escalators. Corrosion-resistant materials (e.g., 304 stainless steel) extend lifespan in outdoor or humid environments. Electroplated finishes (zinc, chrome) offer added protection and aesthetic customization. Some dome nuts include serrated flanges beneath the hex base to resist loosening under vibration, commonly seen in automotive applications.
Application Areas
Dome nuts are ubiquitous in industries prioritizing safety and finish quality. In automotive manufacturing, they secure seat belts and trim components. Construction projects use them for handrails and lighting fixtures. Consumer electronics employ miniature nylon dome nuts to insulate internal wiring. The food processing sector favors stainless steel versions for easy cleaning and compliance with hygiene standards.
Maintenance and Precautions
Regular inspection is advised for nuts in high-vibration settings to detect loosening. Reapply thread-locker compounds if disassembly occurs. Avoid using steel dome nuts on aluminum bolts to prevent galvanic corrosion. For nylon dome nuts, torque should not exceed 0.5 N·m to prevent thread stripping. Store metal variants in dry conditions to avoid oxidation, especially for unplated brass or carbon steel.
B2B Procurement Guide
Bulk purchases typically reduce per-unit costs by 15–30%. Verify certifications like ISO 9001 for consistency. Lead times vary: stainless steel orders may take 2–4 weeks, while nylon stocks are often readily available. Customization options include laser etching for branding or non-standard thread pitches. For export, ensure compliance with regional standards (e.g., REACH for Europe, RoHS for electronics). Sample testing is recommended to confirm load ratings and finish durability.
Related Manufacturers
- 主营：建筑螺栓、地脚螺栓、不锈钢螺栓、半圆球头螺帽、建筑配件
- 主营：不锈钢螺栓、不锈钢索具、不锈钢螺母、半圆球头螺帽、不锈钢钻尾钉、不锈钢膨胀螺栓、平键销、轴销钉、收紧器、骑马卡、合螺丝、接地线、避雷针、支撑架、固定销、螺丝帽、护栏母、斜拉杆、套筒母、预埋件、圆螺母、扁螺母、靠背销、山形卡、定位销、球面垫
- 主营：不锈钢管片螺栓、不锈钢螺栓、管片螺栓、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、螺丝锚栓
- 主营：螺母、螺栓、螺钉、垫圈、铆钉、组合螺丝、自攻螺丝、钻尾螺丝、紧定螺丝、销轴、膨胀螺丝、螺柱、牙条、挡圈、机械零件、索具、螺丝钉、弹簧、车床加工
- 主营：高强度螺栓、热打螺栓、防松螺母、半圆头螺母、螺母、定制地脚螺栓、高强度螺丝、高强度螺母、膨胀螺丝、U型丝、不锈钢螺丝、方垫、幕墙配件、钢结构螺丝、定制异形螺丝、热镀锌螺丝、热镀锌螺母、热打螺母、木螺丝、钻尾丝、销轴、铆钉、垫片、高强度双头、不锈钢螺栓
- 主营：不锈钢螺栓、不锈钢螺母、膨胀螺栓、半圆球头螺帽、光伏支架、钻尾丝、高强度螺栓、热镀锌螺栓、全螺纹丝杆
- 主营：地脚螺栓、高强度螺栓、热镀锌螺栓、半圆球头螺帽、热打螺栓、U型螺栓、风力锚栓、桥梁预埋螺栓、预埋件、化学锚栓、伞把地脚丝、不锈钢螺栓
- 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：纤维板、铝合金、螺丝帽、螺栓螺帽、连接柱、木螺钉、螺丝柱、子母钉、螺丝钉、螺母柱、摄像机、具螺丝、自攻螺丝、平头螺栓、手拧螺母、六角铜柱、六角螺母、六角螺栓、木工螺钉、沉头螺丝、电子螺钉、蝶形螺母、自攻螺钉、平头螺丝、塑料螺丝
- 主营：内六角、内梅花、外六角、球头螺帽、圆柱头、挡圈、铆钉、销钉、自攻螺丝、螺母、膨胀螺栓、垫圈、弹垫、牙条、组合螺丝、木螺丝、钻尾螺丝、丝杆、平垫、紧定、开口销、牙棒
- 主营：铝合金铆钉、六角螺栓、六角螺母、碳钢螺帽、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
- 主营：铆螺母、卡式螺母、压铆螺柱、六角一体盖型螺帽、铆接螺栓、平头不锈钢拉母、不锈钢拉铆螺柱、拉铆螺母、拉帽、通孔铆螺母、盲孔铆螺母、铝制铆螺母、不锈钢铆螺母、沉头铆螺母、平头条纹铆螺母、非标螺母、蓝白锌铆螺母、压铆螺母、碳钢铆螺母、锂电拉铆枪、灯笼铆螺母、通孔压铆螺母、碳钢铆螺柱、平头圆柱压铆螺母、不锈钢拉铆螺母
- 主营：钻尾丝、预埋板、预埋件、自攻丝、连接件、扣丝杠、扣丝杆、自攻螺丝、镀锌丝杆、防水支架、镀锌牙条、镀锌丝杠、六角螺栓、法兰螺母、六角螺丝、化学锚栓、自攻螺钉、钢筋套筒、螺栓定制、弹簧垫片、穿墙丝杠、一体盖母、穿墙螺杆、光伏配件、膨胀螺栓
- 主营：紧固件、螺丝、螺母、异形件
- 主营：钢结构、内六角、热镀锌、紧螺帽、自锁螺帽、大螺母、外六角、m36地脚、m20地脚、12.9地脚、板式地脚、单头螺栓、镀锌地脚、六角螺母、化工螺栓、地铁螺栓、锚板地脚、细牙螺母、化学锚栓、螺栓圆头、细扣螺母、法兰螺母、粗牙螺母、预埋地脚、螺丝红达
- 主营：锁线扣、吊灯线扣、电缆固定夹、球头装饰盖、压线扣、压线片、塑胶螺丝、接线端子、接线盒、灯饰塑胶配件、电缆固定头