Overview
Fire engineering bolt connections are critical components in passive fire protection systems, designed to maintain structural stability during fires. Unlike standard bolts, they incorporate materials and coatings that resist high temperatures, preventing premature failure when exposed to flames. These connections are rigorously tested to meet international standards like EN 1363 or UL 263. In B2B contexts, they are typically supplied to construction firms, steel fabricators, and fire safety system integrators. Their usage is mandated in fire-rated assemblies such as load-bearing walls, seismic joints, and escape route structures where traditional fasteners would compromise safety.
Structure and Working Principle
These bolts feature a core of high-strength steel (e.g., Grade 8.8 or 10.9) with specialized fire-resistant treatments. Common designs include intumescent coatings that expand under heat to form an insulating layer, delaying heat transfer to the bolt's load-bearing core. Some variants use ceramic-based fillers within hollow bolt designs. The working principle relies on maintaining mechanical properties at elevated temperatures. For example, a 90-minute fire-rated bolt must sustain its rated load capacity for at least 90 minutes under standardized furnace testing. Critical parameters include thread engagement depth and washer compatibility to prevent thermal warping effects.
Key Features
Temperature resistance is the foremost feature, with premium grades sustaining functionality up to 1,000°C. Corrosion protection is equally vital, often achieved through hot-dip galvanization or stainless steel alloys to prevent degradation in harsh environments. Dimensional stability under thermal expansion is another critical attribute. Advanced designs incorporate thermal expansion joints or sliding mechanisms to accommodate structural movement during fires without losing tension. Manufacturers provide detailed load-deformation curves at various temperatures for engineering calculations.
Application Areas
Primary applications include steel-framed buildings where bolts connect beams to columns in fire compartments. They're also essential for securing fire doors, smoke barriers, and emergency staircases. Industrial settings like oil refineries or power plants use them in high-risk zones. In infrastructure projects, these bolts appear in tunnel constructions and bridge expansion joints. A niche application is in modular construction, where prefabricated fire-rated modules require on-site bolting without compromising their fire certifications.
Maintenance and Precautions
Regular inspections are mandatory, checking for coating damage or corrosion that could reduce fire resistance. Reapplication of intumescent coatings may be needed after 10–15 years depending on environmental exposure. Installation precautions include torque control to avoid over-tightening, which can crack fire-resistant coatings. Only trained personnel should handle these bolts, as improper installation voids fire ratings. Storage requires dry conditions to prevent moisture absorption by coatings before use.
B2B Procurement Guide
When sourcing, verify certifications from recognized bodies like UL, ETA, or CNAS. Technical datasheets should explicitly state fire resistance duration and temperature thresholds. Lead times are often longer than standard bolts (4–8 weeks) due to specialized manufacturing. Bulk pricing tiers typically start at quantities of 1,000 units, with discounts of 10–25% for large projects. Consider supplier audits to ensure consistent quality, as material composition directly impacts performance. Some manufacturers offer project-specific engineering support for load calculations.
Related Manufacturers
- 主营：电动卷帘门、防火卷帘门、抗曝晒卷帘门
- 主营：防火桥架、镀锌桥架、抗震支架、不锈钢桥架、铝合金桥架、玻璃钢桥架、热浸锌桥架、高分子桥架、成品支架、槽式桥架、梯式桥架、托盘式桥架、光伏支架、成品支吊架、机电综合支架、光伏配件、节能桥架、锌铝镁桥架、侧向抗震支架、双向抗震支架、水管支架、风管抗震支架、水管抗震支架、桥架抗震支架、风机抗震支架
- 主营：钢管杆、钢管塔、架线塔、地脚螺栓、电力地脚螺栓、锚筋地脚螺栓、钢结构地脚螺栓、电力钢杆、钢管电力塔、变电站构架、通讯塔、避雷针、电力塔、输电铁塔、电力监控塔、四柱角钢塔、直线角钢塔、110KV输电钢管杆、棱形钢管杆、35千伏钢管杆、电力构架塔、升压站变电站构架、110kv风电场构架、煤矿变电站构架、变电站通讯塔
- 主营：投光灯塔、雷达塔、监控塔、电力塔、广播电视塔、烟囱塔架、烟囱井子架、电力铁塔、视频监控塔、森林防火监控塔、监控塔厂家、风电杆、风力发电钢杆、烟囱塔、照明灯塔、防火监控塔、森林瞭望塔、防火瞭望塔、广播电视发射塔、烟筒塔、烟筒塔架、烟筒井子架、摄像监控塔、角钢监控塔、高压电线铁塔
- 主营：不锈钢阳极管、不锈钢圆钢、不锈钢冷轧、304不锈钢螺栓、不锈钢热轧、不锈钢阴极线、不锈钢喷淋、不锈钢滤网
- 主营：焊钉、环槽铆钉、桥梁焊钉、钢结构螺栓、扭剪螺栓、扭剪型螺栓、大六角螺栓、大六角头螺栓、高强度扭剪螺栓、圆柱头焊钉、栓钉、钢结构扭剪螺丝、剪力钉、钢结构剪力钉、楼承板用栓钉、哈克套环拉铆钉、哈克钉
- 主营：热镀锌丝杠、热镀锌丝杆、热浸锌丝杆、管片螺栓、钢结构大六角螺栓、高强度螺栓、双头弧形螺栓、地脚螺栓、达克罗盾构管片螺栓、地脚螺栓预埋件、9字螺栓、钢结构螺栓、m20高强度螺栓、10.9级摩擦型螺栓、螺栓扭剪型、热镀锌通丝吊杆m10、钢结构螺丝、钢结构大六角、大六角钢结构、热镀锌m8牙条、镀锌通丝吊杆、8厘吊杆、盾构隧道的管片、丝杆螺杆
- 主营：射钉、保温钉、塑料钉、保温射钉、一体化塑钢钉、塑料膨胀固定钉、门窗垫片、家具调平垫片、外墙保温钉、一体式保温钉、塑料保温钉、塑钢保温钉、小红帽保温钉、钢塑保温钉、非标保温钉、连体保温钉、网格布保温钉、分体保温钉、墙体保温钉、膨胀保温钉、飞机涨塞、一体钉、膨胀钢塑钉、外墙膨胀塑钢钉、浇筑保温钉
- 主营：10.9S钢结构螺栓、Q235B地脚螺栓、8.8级高强度外六角、Q355B预埋锚栓、3米镀锌丝杆
- 主营：钢结构大六角螺栓、钢结构扭剪型螺栓、热镀锌螺栓、热渗锌螺栓、地脚螺栓
- 主营：潜水泵、深井泵、浮筒泵、卧式潜水泵、潜水轴流泵、矿用潜水泵、污水泵、潜油电泵、热水泵、双吸泵、永磁泵、防汛泵车、管中泵、管道离心泵、漂浮泵、下吸式潜水泵、中吸泵、化工泵、立式潜水混流泵、矿井深井泵、农用清水泵、轴流潜水泵、潜水混流泵、流潜水电泵
- 主营：缓冲垫、清扫器、轴承座、防滑板、尼龙轮、密封条、旋流器、上托辊、聚氨酯、过浆管、输送机、黄色pu棒、橡胶软管、叶轮盖板、泥沙分离、橡胶缓冲、调心托辊、森钐橡塑、橡胶地辊、水泵叶轮、橡塑耐磨、直径套筒、配件尼龙、脱水筛网、过渡托辊
- 主营：波形护栏、波形护栏板、标杆标牌、护栏网、波形护栏配件、标志杆、标志牌
- 主营：锚杆测力计、气动阻车器、锚杆扭矩放大器、轨道连接板、司控道岔装置、局部通风机
- 主营：单体液压支柱、金属顶梁、尼龙柱鞋、连接环、铁柱鞋、气动葫芦、除铁器、防跑车装置、玻璃钢支柱、锚杆、U型钢支架、隔爆水袋、电缆挂钩、道岔、马丽散、无压风门、防水密闭门、避难硐室门、防火栅栏门、风筒、圆环链、三环链、阻车器、矿车、平板车
- 主营：避雷塔、避雷针塔、避雷塔架、消防训练塔、监控塔、电力塔、烟囱塔、测风塔、通讯塔、电力构架、瞭望塔、装饰避雷塔、角钢塔、单管塔、广播电视塔、仿生树塔、景观塔、拉线塔、监控杆、一体化基站