Seal O Ring (O型圈): A circular sealing element with a round cross-section, used to prevent leakage of fluids or gases. 安装在各种液压和气动系统中，用于密封液体或气体。Example Keyword: Caterpillar CAT 320D Seal O Ring (卡特彼勒CAT 320D O型圈)

Pin-Spring (弹簧销): A type of fastener that uses a spring action to hold components together. 用于连接和固定机械部件。Example Keyword: Caterpillar CAT D8T Pin-Spring (卡特彼勒CAT D8T 弹簧销)

Gasket (垫片): A material placed between two surfaces to create a static seal, preventing leakage. 用于发动机、泵等部件之间的密封。Example Keyword: Caterpillar CAT 140G Gasket (卡特彼勒CAT 140G 垫片)

Bolt (螺栓): A threaded fastener used with a nut to hold materials together. 用于连接各种机械结构的部件。Example Keyword: Caterpillar CAT 777D Bolt (卡特彼勒CAT 777D 螺栓)

Washer (垫圈): A thin plate with a hole that is used to distribute the load of a threaded fastener or to prevent loosening. 用于螺栓和螺母之间，增大接触面积或防止松动。Example Keyword: Caterpillar CAT 966H Washer (卡特彼勒CAT 966H 垫圈)

Nut (螺母): A threaded fastener that screws onto a bolt to secure components. 与螺栓配合使用，用于紧固连接。Example Keyword: Caterpillar CAT 330C Nut (卡特彼勒CAT 330C 螺母)

Capscrew (内六角螺钉): A type of screw with a hexagonal head, typically tightened with an Allen wrench. 一种头部为六边形的螺钉，通常使用内六角扳手拧紧。Example Keyword: Caterpillar CAT 416D Capscrew (卡特彼勒CAT 416D 内六角螺钉)

Ring-Retaining (挡圈): A type of fastener that fits into a groove on a shaft or in a bore to prevent axial movement of components. 安装在轴或孔的槽中，用于防止部件轴向移动。Example Keyword: Caterpillar CAT D6R Ring-Retaining (卡特彼勒CAT D6R 挡圈)

Screw (螺钉): A threaded fastener that is inserted into a material by turning it. 通过旋转插入材料中的一种螺纹紧固件。Example Keyword: Caterpillar CAT 12G Screw (卡特彼勒CAT 12G 螺钉)

Lock (锁片): A component used to prevent fasteners from loosening due to vibration or movement. 用于防止紧固件因振动或移动而松动。Example Keyword: Caterpillar CAT 740B Lock (卡特彼勒CAT 740B 锁片)