Overview
Fine rolled threaded steel bars, also known as precision-rolled rebar, are cold-formed steel bars with continuous external threading for high-strength structural connections. They are manufactured through a controlled rolling process to ensure dimensional accuracy and mechanical properties. Unlike hot-rolled rebar, these bars undergo additional precision rolling to create uniform threading patterns, enabling direct use with coupling sleeves without secondary processing. This makes them ideal for prefabricated construction and modular building techniques.
Structure and Working Principle
The bar consists of a cylindrical steel core with helical ridges rolled onto its surface at precise pitch intervals. The threading geometry is standardized (e.g., metric or imperial) to ensure compatibility with coupling systems. When installed, the threaded ends connect via couplers to transfer axial and shear loads. The cold-working process during rolling increases yield strength (typically 500-700 MPa) while maintaining ductility. Some variants feature corrosion-resistant coatings like epoxy or galvanization for harsh environments.
Key Features
1. **Dimensional Precision**: Threads are rolled to tolerances of ±0.1 mm, eliminating the need for on-site threading. 2. **High Strength-to-Weight Ratio**: Cold working enhances strength without adding material weight. 3. **Seamless Connectivity**: Compatible with standardized couplers for rapid assembly. Additional features may include anti-loosening notch designs or ultrasonic testing certification for critical applications. The bars comply with international standards such as ASTM A615 or ISO 6935-2.
Application Areas
Primary applications include high-rise building cores, bridge piers, and seismic-resistant structures where threaded connections outperform traditional lap splicing. They are also used in precast concrete elements for quick assembly, tunnel lining supports, and temporary shoring systems. In mechanical engineering, they serve as tie rods in press machines or as anchor bolts for heavy equipment foundations.
Maintenance and Precautions
Store bars horizontally on wooden pallets to prevent thread damage. Outdoor storage requires waterproof covers to avoid rust contamination of threads. During installation, apply thread lubricants if specified by the manufacturer. Avoid impact loads during handling, as dents may compromise coupling integrity. Regular inspection for thread wear or corrosion is recommended in exposed applications.
B2B Procurement Guide
1. **Specification Checklist**: Confirm required diameter (commonly 12-40 mm), thread pitch, and coating type (bare, galvanized, or epoxy). 2. **Certifications**: Request mill test reports for tensile strength and chemical composition per ASTM/ISO standards. 3. **Logistics**: Bars are typically bundled in 2-3 ton packs; verify straightness tolerance (≤1 mm/m). Leading manufacturers include ArcelorMittal, Nippon Steel, and local producers with rolling mill certifications. Sample testing is advisable for large projects.
Related Manufacturers
- 主营：建筑钢材、盘螺、线材、螺纹钢、三级螺纹钢、四级螺纹钢、抗震钢材、热镀锌角铁、宝钢矩形钢管、建筑材料钢材、韶钢、桂万钢、钢筋、高强度钢筋、钢筋加工、型材、钢材价格、钢材市场
- 主营：镀锌管、工字钢、镀锌钢板、精轧螺纹钢、不锈钢板、外架焊管、耐磨钢板、热轧钢板、防滑钢板、薄壁焊管、铺路钢板、供水焊管、螺旋焊管、焊接焊管、冷轧钢板、止水钢板、无缝钢管、二手钢板、热轧h型钢、国标h型钢、立柱h型钢、焊接h型钢、低合金钢板、桁架楼承板、防腐彩钢瓦、大口径焊管
- 主营：钢绞线、电动油泵、金属波纹管、精轧螺纹钢、精轧钢筋螺母、塑料波纹管、桥梁多孔锚具、预应力锚杆、锚索张拉机油泵
- 主营：挖藕机、划线机、劈石机、修剪机、除雪机、铁水包、铜水包、凿岩机、呼吸器、地钻、水带、灭火器、播种机、U型钢支架、高倍数泡沫机、钢筋机械、园林机械、轨道机械、搅拌机、开槽机、矿车、调度绞车、耙斗装岩机
- 主营：矿用风门、钻孔轨迹仪、钻孔定向仪、精轧螺纹钢、测斜仪、矿用钢丝绳探伤仪、矿用掘进机、矿用采煤机、矿用装载机、刮板机、输送机、给煤机、绞车、矿车、混凝土搅拌机、混凝土输送泵、喷浆机、履带钻机、潜孔钻机、单体液压支柱、防爆风机、钻孔成像仪、铁路钢轨、变压器、螺旋支柱
- 主营：喷射器、高压软管、聚能管、精轧螺纹钢、船用风机、速凝剂、气浮搬运车、螺旋千斤顶、手拉葫芦、牵引绞索、道口栏木机、矿用风门、树篦子、临时支护、叉车吊、皮带硫化机、链轮组件、矿用密闭门、电动卷扬机、翻车机、拆缸机、洗靴机、电动搬运坦克车、矿车轮对、搬运气垫、裤管风机
- 主营：螺纹钢、钢板桩
- 主营：镀锌槽钢、工字钢、角钢、螺纹钢、槽钢、方管、扁钢、C型钢、镀锌卷、钢板桩、焊管、花纹板、冷轧板、螺旋管、容器板、铜包钢、无缝管、圆钢、中厚板、型材、板材、管材
- 主营：开坯机、250五排连轧、250角钢轧机、螺纹钢轧机、轧钢机、带肋钢筋冷轧轧机、热轧机、型钢轧机、辊上调整、辊下调整、机械冷弯、二辊轧机、圆钢轧钢、机械带钢、四辊轧机、机械废钢、机械热轧、机械棒材、二辊闭口、轧钢设备、胚机轧钢、机械自控、配件定制、机械扁钢、机械连铸
- 主营：消防机器人、履带运输车、漏电探测仪、精轧螺纹钢、巡检机器人、消防箱、消防服、破拆工具组、干粉灭火器、打药喷雾机、传感器、电磁阀、保护器、电动脚手架、装载机电子秤、砌筑升降平台、光伏板升降机、内撑吊具、混凝土振动棒、打标机、裁剪机、研磨机、压铆机、小型装载机、洗消剂、防爆风机
- 主营：H型钢(国标/外标)、工字钢(国标/外标)、槽钢(国标/外标)、螺纹钢、角钢、方管、无缝管、焊管、钢管、无缝钢管、扁钢、方钢、开平板、花纹板、中厚板、圆钢、特钢、不锈钢管、热轧卷
- 主营：无缝管、合金管、锅炉管、管线管、镀锌管、镀锌方管、角钢、槽钢、工字钢、H型钢、钢板、钢绞线、镀锌板、镀锌钢绞线、Q235B镀锌花纹板、预应力钢绞线、镀锌管生产厂家、热浸镀锌无缝钢管、环氧树脂钢筋、Q235B热镀锌角钢、低温板、Q235GJ镀锌卷、木纹彩涂板、止水钢板桩、环氧涂层钢筋
- 主营：不锈钢螺栓、不锈钢索具、不锈钢螺母、精轧螺纹钢、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：建筑螺栓、地脚螺栓、不锈钢螺栓、精轧螺纹钢、建筑配件
- 主营：不锈钢螺栓、不锈钢螺母、膨胀螺栓、精轧螺纹钢、光伏支架、钻尾丝、高强度螺栓、热镀锌螺栓、全螺纹丝杆
- 主营：钢结构大六角螺栓、热镀锌丝杠、钢结构扭剪型螺栓、钢结构螺栓、管片螺栓、高强度螺栓、热浸锌牙条、热镀锌丝杆、弧形双头螺栓、地脚螺栓、预埋件、地脚螺栓预埋件、钢结构预埋件、M16地脚螺丝、m24地脚螺栓预埋件、m8吊顶丝杆、地铁管片螺栓、达克罗盾构管片螺栓、10.9S高强度螺栓、大六角螺栓、国标螺栓10.9级、钢结构大六角、热镀锌m8牙条、热镀锌通丝吊杆m10、10.9S螺栓
- 主营：无缝钢管、钢板桩、不锈钢管、精密钢管、精制钢方管、无缝管、化肥专用管、管线管、石油裂化管、锅炉管、高压锅炉管、镀锌钢管、镀锌管、螺旋钢管、合金钢管、钢绞线、20G无缝钢管、角钢、槽钢、工字钢、H型钢、钢板、Q235B角钢、镀锌螺旋管、防腐钢管
- 主营：sa675gr70、f11圆钢、f92圆钢、HRB400螺纹钢筋、f51圆钢、f91圆钢、34crnimo6、60si2crva、30crmntih、20crnimoa、b16圆钢、20crmnmoa、25#圆钢、30crnimo8、17crnimo6、h13圆钢、f53圆钢、f52圆钢、30crmnsia、40crmnmoa、f55圆钢、a36圆钢、f22圆钢、20crni2mo、f60圆钢、35crmnsia