Race （軸承內，外，座）圈；競賽，賽跑，全速行駛，發動機空轉；種族
Raceabout（美）賽車
Rack 齒條,導軌,支架
Rack and pinion 齒輪齒條
Rack and pinion jack 齒輪齒條式千斤頂
Rack link 齒條聯接桿
Rack nut 齒條螺母
Rack shaft 齒條
Rack-type steering gear 齒條式轉向器
Radial bearing 向心軸承
Radial brush 徑向電刷
Radial engine 星形發動機
Radial flow type converter 徑流式轉化器
Radial piston pump 徑向活塞泵
Radial ply tire 子午線輪胎
Radial roller bearing 向心滾子軸承
Radial run-out 徑向跳動
Radial spoke 徑向輻條
Radial stiffness (車輪)徑向剛度
Radial turret head 六角刀架
Radian 孤度(角)的單位
Radiant heat 輻射熱
Radiating fin 散熱片
Radiation dryer 輻射式干燥器
Radiation of heat 熱輻射
Radiation pollution 輻[放]射污染
Radiation protection 輻[放]射防護
Radiator 散熱器,水箱
Radiator cap 散熱器蓋
Radiator case frame 散熱器框架
Radiator cleaner 散熱器清洗器
Radiator core 散熱器芯
Radiator cover 散熱器面罩
Radiator cowling 散熱器罩
Radiator flush 散縶器沖洗器
Radiator hose clip 散熱器軟管夾
Radiator insulation 散熱器隔振墊
Radiator mascot 散熱器蓋口裝飾性標志
Radiator of airconditioner 空氣調節系統散熱器
Radiator overflow 散熱器溢流管
Radiator protecting plate 散熱器護板
Radiator repair stand 散熱器修理架
Radiator shell 散熱器外殼
Rear apron 后檔板
Rear axle 后軸,后橋
Rear axle casing（獨立懸掛）后橋軸殼
Rear axle housing 后軸殼
Rear axle bousing cover 后軸殼蓋
Rear axle radius rod 后軸縱向位桿
Rear axle shaft 后橋半軸
Rear axle tube 后軸半軸套管
Rear bearing cover 后軸承蓋
Rear bearing cover packing 后軸承蓋填料
Rear brake 后軸制動器
Rear brake lever 后制動器桿
Rear brake lining 后制動器摩擦片
Rear bumper 后保險桿
Rear bumper height 后保險杠高
Rear engine 后置發動機
Rear-engined bus 后置發動機客機
Rear engine rear drive 后置發動機后輪驅動
Rear engine support 發動機后支架
Rear servo-brake 后助力制動分室
Rear shelf 后窗臺板
Rear side member 后縱梁
Rear spoiler 后擾流板
Rear spring 后彈簧
Rear spring bracket 后鋼板彈簧架
Rear stabilizer bar 后穩定桿
Rear support bracket 后支承架
Rear support insulator bolt 后支架軟墊螺栓