RIGID HITCH 5-Bolt 4-1/2 Inch Bolt Circle 10 Inch Hub Drum with Hydraulic Brake Assembly - Driver Side - Heavy Duty Trailer Axle Replacement for Towing & Hauling" 优化说明： 1. 符合SEO规范：保留核心关键词（5-Bolt, 4-1/2 Inch, Hub Drum, Hydraulic Brake等），去掉冗余品牌名（INCORPORATED），结构清晰。 2. 增加使用场景：补充"**Heavy Duty Trailer Axle Replacement for Towing & Hauling**"，明确适用于拖车/货运场景，提升搜索相关性。 3. 简洁易读：删除重复表述（如"Bolt on"简化为"Bolt"），用连词符优化可读性。

Product Description

This hub/drum assembly contains everything you need to replace your hub/drum & brake on the drivers side of your trailer. This assembly works for a spindle that has a 1-3/8" inner bearing surface to a 1-1/16" bearing surface. The 10" x 2-1/2" hub/drum has a 5 bolt on 4-1/2" bolt circle with a 1,750 lbs capacity PER side. Fits 3,500 lb axles. This also includes a 4-bolt hydraulic backing plate that mounts directly onto your axle's drivers side flange. The 4-bolt hole spacing is 2-7/8" apart with a 3" center hole diameter. Rated at 1,750 lbs each / 3,500 lbs per pair. (4)- 7/16"-14 x 1-1/2" bolts, nuts and lock washers are included. Also include the bearings & seal. Seal included is a double lip SL-172 with a 2.561" outside diameter and a 1.719 inside diameter, .50" thickness. (1) L-68149 inner bearing (1.378" I.D), (1) L-44649 outer bearing (1.0625" I.D), (1) cotter pin, (1) dust cap and (5) 1/2"-20 lug nuts. The races are preinstalled in the hub/drum for your convenience. Please note: Castle nut or grease are not included in this assembly.