Threadlocker Selection and Assembly Guide螺纹锁固胶选型与装配指南

What a threadlocker does螺纹锁固胶的作用

Anaerobic threadlockers stay liquid in air and cure only when confined between metal threads without air. The cured adhesive fills the gaps between the threads.螺纹锁固胶是厌氧胶：在空气中保持液态，只有在隔绝空气的金属螺纹之间才会固化。固化后的胶把螺纹间的间隙填满。

• Prevents loosening from vibration and shock防止振动和冲击引起的松动
• Seals the thread against leakage密封螺纹，防止渗漏
• Protects the thread from rust and fretting corrosion防止螺纹生锈和微动腐蚀

Choosing the strength按强度选型

Example: the KEMA KemLock® AS range.以 KEMA KemLock® AS 系列为例。

• Will be removed for maintenance: choose medium strength (AS-43 is the most versatile).日后需要维修拆卸：选中强度，AS-43 最通用。
• Permanent, not to be removed: choose high strength (AS-70 / AS-75).永久固定、不打算拆：选高强度 AS-70 / AS-75。
• Small adjusting or set screws: choose low strength (AS-22).小螺钉、调整螺钉：选低强度 AS-22。

Assembly step by step装配步骤

1. Clean and degrease the threads. Oil and dirt slow or prevent curing (AS-43 tolerates light oil).清洁螺纹并除油。油污会让胶固化变慢甚至不固化（AS-43 可容忍少量油）。
2. On inactive surfaces (stainless steel, zinc-plated, zinc-flake, anodised aluminium), cure is slow or incomplete: use a primer, or test first and allow longer cure time.惰性表面（不锈钢、镀锌、锌铝涂层、阳极氧化铝）上固化慢或固化不完全：先涂底剂，或先做试验并延长固化时间。
3. Through hole: apply to the bolt thread where it will engage the nut. Blind hole: put drops into the bottom of the tapped hole, otherwise trapped air pushes the adhesive out.通孔：涂在螺栓与螺母啮合的那几扣螺纹上。盲孔：要滴到孔底的内螺纹里，否则拧入时孔底空气会把胶顶出来。
4. Use just enough to fill the engaged threads. More adhesive does not add strength.用量以填满啮合螺纹为准，多涂不会更牢。
5. Tighten to final torque in one go, within the handling time (5–30 min depending on grade).在可调整时间内（视型号 5–30 分钟）一次拧到最终扭矩。
6. Allow cure before loading: functional strength after about ½–3 h, full cure after 1–10 h (KemLock AS, room temperature). Cure is slower in the cold.承载前留出固化时间：功能强度约 ½–3 小时，完全固化 1–10 小时（KemLock AS，室温）。低温时固化更慢。

Points to watch注意事项

• Torque and preload: the liquid adhesive lubricates during tightening, so the same torque can give a different preload. For critical joints, check the torque with the actual parts.扭矩与预紧力：拧紧时液态胶起一定润滑作用，同样扭矩下预紧力会变化。关键连接请用实际零件确认扭矩。
• Temperature: KemLock AS is rated −55 °C to +150 °C. Strength drops above this range.温度：KemLock AS 使用温度 −55 °C 至 +150 °C，超出后强度下降。
• Disassembly: low and medium grades come apart with hand tools. High-strength joints usually need local heating to about 230–315 °C and should be undone while still hot.拆卸：低、中强度用普通工具即可。高强度一般需局部加热到约 230–315 °C，趁热拆卸。
• Plastics: anaerobic adhesives can stress-crack some thermoplastics. Test before use on plastic parts.塑料件：厌氧胶可能使部分热塑性塑料应力开裂，用于塑料件前请先试验。
• Inspection: KemLock adhesives are fluorescent, so missing adhesive can be spotted under UV light on the assembly line.检查：KemLock 带荧光，流水线上用紫外灯即可查出漏涂。

More on tightening: Torque and Preload.拧紧扭矩详见：扭矩与预紧力。

Pre-applied coatings on fasteners紧固件预涂工艺

Instead of liquid adhesive on the line, the locking function can be applied to the fastener in advance:除了在装配线上涂液态胶，也可以在紧固件出厂前预先做好防松处理：

• Microencapsulated adhesive coating (DIN 267-27): Adhesive is pre-applied to the thread at the factory. The capsules break when the screw is tightened and the adhesive then cures. No adhesive handling on the line; for one-time assembly.微胶囊预涂胶（DIN 267-27）：出厂前把胶预涂在螺纹上，拧紧时胶囊破裂后开始固化。装配线上不用再涂胶，适合一次性装配。
• Polyamide locking coating (DIN 267-28): A polyamide patch on the thread creates friction that resists loosening. It does not cure, so the fastener can be reassembled a limited number of times.尼龙防松涂层（DIN 267-28）：在螺纹上涂一块尼龙，靠摩擦阻力防松。它不固化，紧固件可以有限次地重复拆装。

KemLock AS data from the current KEMA technical data sheets (M10 × 20 bolt, grade 8.8 zinc-plated, DIN 54454). General guidance only; follow the adhesive data sheet and your drawing.KemLock AS 数据取自 KEMA 现行技术数据表（M10 × 20 螺栓，8.8 级镀锌，DIN 54454）。本指南为通用参考，请以胶粘剂技术数据表和图纸为准。