Overview
The M26 hex socket head cap screw is a heavy-duty mechanical fastener designed for applications requiring high clamping force and compact drive systems. Its internal hexagonal socket allows torque application via an Allen key, making it ideal for confined spaces. Standardized under ISO 4762 or DIN 912, these screws are prevalent in industries like automotive, aerospace, and structural engineering. With a nominal diameter of 26 mm, this screw size accommodates substantial loads. Manufacturers often offer customization in thread length, head height, and material grades to suit specific engineering requirements, ensuring compatibility with diverse operational environments.
Structure and Working Principle
The screw consists of a cylindrical head with an embedded hex socket and a threaded shank. The head’s flat underside distributes pressure evenly, reducing surface damage. The hex drive system transfers torque more efficiently than Phillips or slotted drives, minimizing cam-out risks. During installation, the Allen key engages the socket to rotate the screw, advancing the threads into a pre-tapped hole or nut. The design ensures a flush finish, eliminating protrusions that could interfere with adjacent components. Critical dimensions include the socket depth (typically 15–18 mm for M26) and thread pitch, which must match mating parts.
Key Features
Hex socket head cap screws excel in tensile strength, with Grade 10.9 variants offering up to 1,040 MPa ultimate strength. Stainless steel versions (A2/A4) provide corrosion resistance, suitable for marine or chemical environments. Their low-profile head design is space-efficient, while the internal drive reduces tool slippage. Some variants include underhead serrations for vibration resistance or PTFE coatings to prevent galling. For reference, an M26 screw’s head diameter is approximately 39 mm, with a socket size of 10 mm.
Application Areas
These screws are indispensable in heavy machinery, such as hydraulic presses and wind turbines, where vibration resistance and load-bearing capacity are critical. In automotive systems, they secure engine blocks and transmission housings. Construction applications include steel framework connections and bridge assemblies. The aerospace sector relies on titanium alloy variants for weight savings. For high-temperature environments, alloy steels with thermal coatings (e.g., black oxide) are preferred.
Maintenance and Precautions
Regular inspection for thread wear or head deformation is advised, especially in dynamic loads. Use thread-locking compounds (e.g., Loctite) in vibration-prone setups. Clean sockets of debris to prevent tool rounding. Avoid mixed material pairings (e.g., steel screw in aluminum) without anti-corrosion measures. Torque values should adhere to manufacturer guidelines—for instance, an M26 Grade 8.8 screw typically requires 900–1,100 N·m with lubrication.
B2B Procurement Guide
Bulk buyers should specify material grade, coating, and thread length (e.g., 50 mm for M26). MOQs often start at 1,000 units, with discounts for volumes exceeding 10,000. Lead times vary from 2–6 weeks for custom orders. Reputable suppliers provide mill test reports (MTRs) for material verification. Consider logistics: palletized shipments reduce handling costs for large orders. For OEMs, private labeling and packaging options are commonly available.
Related Manufacturers
- 主营：锁紧盘、联轴器、蛇形弹簧联轴器、内六角、鼓形齿联轴器、安全联轴器、胀紧套、皮带轮、扭力限制器、弹簧、梅花联轴器、星形联轴器、链条联轴器、膜片联轴器、柱销联轴器、轮胎联轴器、高弹联轴器、十字滑块联轴器、万向联轴器、万向节、球笼联轴器、锥套皮带轮、Z9胀紧套、Z8胀紧套、凸缘联轴器、SWC联轴器
- 主营：高强度螺栓、全螺纹螺柱、地脚螺栓、内六角、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：弹簧扣、开口销、标准件、自攻螺钉、十字螺钉、焊接螺钉、开槽螺钉、皇冠螺钉、肩螺丝、斜垫圈、紧固件、自攻钉、斜垫片、安全螺母、两用扳手、六角螺母、防盗螺丝、止动垫圈、焊接螺母、蝶形螺丝、弓形卸扣、钢丝螺套、手拧螺丝、法兰螺丝、喉箍挂件
- 主营：预埋件、焊接螺丝、厂房电力铁塔、内六角、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：内六角组合螺栓、化学螺栓、预埋螺栓、钢结构螺栓
- 主营：组合螺栓、外六角螺栓、外六角组合件、开槽平端紧定螺钉、外六角组合套装、外六角组合螺丝
- 主营：防水盖片、屋脊气楼、排烟天窗、标的螺钉、自钻螺钉、自攻螺钉、丁基不干胶、防水透汽膜、通风气楼、通风器、丁基胶带
- 主营：8.8级高强度外六角、10.9S钢结构螺栓、Q235B地脚螺栓、哈迪威镀锌内六角、Q355B预埋锚栓、3米镀锌丝杆
- 主营：地脚螺栓、镀锌勾头螺栓、镀锌六角钻尾丝、内六角、不锈钢全螺纹螺柱、不锈钢沉头钻尾、不锈钢六角内膨胀、镀锌膨胀螺栓、钢结构拉条、高强度双头螺栓、焊钉、车修壁虎、高强度弹垫、高强度平垫、不锈钢干挂件、化学锚栓、镀锌干挂件、镀锌化学锚栓、铝合金挂件、热镀锌机械锚栓、热镀锌预埋件、穿山刺砌块螺丝、国标地脚螺栓、窗式壁虎、机械锚栓、膨胀六角螺栓
- 主营：卸扣、钢丝绳卡头、花篮螺栓、不锈钢内六角螺丝、开体花兰螺丝、吊环螺栓螺母、鸡心环、吊装带、万向旋转吊环、光伏螺栓、链条
- 主营：钻尾丝、预埋板、防松螺母、盘头内六角螺钉批发、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：钻尾丝、预埋板、预埋件、自攻螺钉、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、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：铝合金铆钉、六角螺栓、六角螺母、内六角螺丝、圆头螺钉、梅花螺钉、四方螺栓、方螺母、圆柱头螺丝、十字自攻、沉头螺丝、平垫、弹垫、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：内六角螺钉、六角螺栓、螺母、紧固件
- 主营：建筑螺栓、地脚螺栓、不锈钢螺栓、内六角自攻、建筑配件