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Trailer Parts and Axles // Trailer Axles // Dust Caps for Trailer Hubs and Drums // Oil Caps

Oil Caps

Looking for high-quality and reliable oil caps for your trailers? Southwest Wheel® is your trusted source for a wide range of top-rated oil caps, with over 100 years of experience in the wheel and trailer part industry.

Choose from a variety of oil caps such as the Dexter® General Duty Trailer Axle Oil Caps or the Lippert® Trailer Axle Oil and Dust Cap with Set Screw designed for durability and performance.

Explore our selection of oil caps and find the perfect fit for your trailer at Southwest Wheel® today! Don't compromise on quality when it comes to your trailer maintenance.

Steel Grease Cap designed for bolt-on medium-duty grease applications with axle capacities between 9,000 lbs. and 12,000 lbs. This robust cap is crafted from 11-gauge stamped steel and features a corrosion-resistant Zinc coating, making it ideal for challenging environments Axles produced after October 2023 come with an updated 9,000 – 12,000 lb. hub series designed for a bolt-on style. Please be aware that aftermarket bolt-on grease caps are NOT compatible with legacy thread-in hubs and will ONLY fit Dexter hubs with a bolt-on design.Made In The USA
Dexter 9,000 lbs. – 12,000 lbs. Bolt-On Steel Grease Cap K21-307-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Dexter 9,000 lbs. – 12,000 lbs. Bolt-On Steel Grease Cap K21-307-00
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Price: $42.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Bolt-On Aluminum Cap - 9,000 - 12,000 lbs. K21-259-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 9,000 - 12,000 lbs. Dexter Axles #13G, #13D, #14, #14T, D90, D100G, D100, D120
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Price: $41.99
Dexter® 6 bolt and utility hubs, 2⁵⁄₈"-12 thread Oil Cap - 021-040-00Made In The USA
Dexter® 6 bolt and utility hubs, 2⁵⁄₈"-12 thread Oil Cap - 021-040-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits Dexter 6 bolt and utility hubs, 2⁵⁄₈"-12 thread
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25% Off Inventory Reduction Sale Auto Applied at Checkout
Price: $22.99
Lippert® Threaded Dust Cap with Rubber Plug & O-Ring, 2-7/8" Diameter, 8,000-lb. Axles - 85373929
Lippert® Threaded Dust Cap with Rubber Plug & O-Ring, 2-7/8" Diameter, 8,000-lb. Axles - 85373929
$9.99  FedEx  Flat Rate Shipping Per Order
Lippert® Threaded Dust Cap with Rubber Plug & O-Ring, 2-7/8" Diameter, 8,000-lb. Axles #85373929 Keeps dust and debris out, maintaining hub performance Compatible with 8,000-lb
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Price: $46.99
Pair of Oil Caps for Dexter® 10,000 lbs. General Duty Trailer Axle - K71-704-00Made In The USA
Pair of Oil Caps for Dexter® 10,000 lbs. General Duty Trailer Axle - K71-704-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits Dexter 9K and 10K GD uni-cast hub-drum
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Price: $47.99
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear - 85373928
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear - 85373928
$9.99  FedEx  Flat Rate Shipping Per Order
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear #85373928 Keeps dust and debris out, maintaining hub performance Compatible with 8,000-lb. axles with a thr
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Price: $49.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Threaded Cap - 5,200 - 8,000 lbs. K21-303-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 5,200 - 8,000 lbs. (Dexter, Rockwell & Lippert Axles)
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Price: $44.99
TruRyde® Defender Oil Cap for 8K Axle - DC-O-288
TruRyde® Defender Oil Cap for 8K Axle - DC-O-288
$9.99  FedEx  Flat Rate Shipping Per Order
TruRyde® Defender Oil Cap for 8K Axle - DC-O-288
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Price: $46.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Threaded Cap - 9,000 - 10,000 lbs. GD K21-302-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 9,000 - 10,000 lbs. GD (Dexter Axles)
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Price: $39.99
Lippert® Trailer Axle Oil and Dust Cap - 10,000 to 16,000 lbs. Clear - 693935
Lippert® Trailer Axle Oil and Dust Cap - 10,000 to 16,000 lbs. Clear - 693935
$9.99  FedEx  Flat Rate Shipping Per Order
  Easy, screw-in installation Designed for 8,000-lb. axle hubs O-ring and plug included for a complete seal Clear cap allows for better retention and visua
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Price: $15.99
Lippert® Threaded Dust Cap with Rubber Plug, O-Ring, 4" Diameter, 10,000-16,000-lb. Axles - 85373829
Lippert® Threaded Dust Cap with Rubber Plug, O-Ring, 4" Diameter, 10,000-16,000-lb. Axles - 85373829
$9.99  FedEx  Flat Rate Shipping Per Order
Lippert® Threaded Dust Cap with Rubber Plug, O-Ring, 4" Diameter, 10,000-16,000-lb. Axles #85373829 Keeps dust and debris out, maintaining hub performance Compatible with 10,000-16
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Price: $53.99
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear - 85373828
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear - 85373828
$9.99  FedEx  Flat Rate Shipping Per Order
Lippert® Trailer Axle Oil and Dust Cap with Set Screw - 8,000 lbs. Clear #85373828 Keeps dust and debris out, maintaining hub performance Compatible with 10,000-16,000-lb. axles wi
(Images, descriptions, volume discounts, find out more...)
Price: $53.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Threaded Cap - 10,000 - 16,000 lbs. K21-304-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 10,000 - 16,000 lbs. (Rockwell & AL-KO Axles)
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Price: $40.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Threaded Cap - 10,000 - 16,000 lbs. K21-305-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 10,000- 16,000 lbs. (Lippert Axles)
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Price: $39.99
TruRyde® Defender Oil Cap for 10K Axles - DC-O-375
TruRyde® Defender Oil Cap for 10K Axles - DC-O-375
$9.99  FedEx  Flat Rate Shipping Per Order
TruRyde® Defender Oil Cap for 10K Axles - DC-O-375
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Price: $49.99
Save Time & Effort Featuring a larger, conveniently accessible side fill/drain plug, this innovative product streamlines maintenance tasks. Whether for oil or grease applications, the Fortress Oil Cap adapts to your needs. Backed by Dexter's 5-year warranty, it guarantees reliability and peace of mind. Upgrade your trailer with the Fortress Oil Cap and experience unparalleled convenience and performance. Protect Your Investment Backed by over 60 years of known and trusted technology, Fortress offers a complete line of aluminum caps. Engineered and designed by Dexter as a bona fide superior bearing protection solution for several Dexter axle capacities. Fortress bolt-on caps are available on Dexter axle capacities 9K through 12K, offering industrial-grade fortification similar to comparable heavy truck and trailer applications. Fortress threaded caps are available on Dexter axle capacities 7K through 8K and 15K through 16K. With durability in every detail, hit the road knowing your equipment is fortified with next-level bearing protection.
Dexter Fortress Threaded Cap - 10,000 HD - 15,000 lbs. K21-301-00
$9.99  FedEx  Flat Rate Shipping Per Order
Dexter Fortress Threaded Cap Fits - 10,000 HD - 15,000 lbs. (Dexter Axles)
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Price: $43.99
TruRyde® Defender Oil Cap for 10K - 16K Axles - DC-O-400
TruRyde® Defender Oil Cap for 10K - 16K Axles - DC-O-400
$9.99  FedEx  Flat Rate Shipping Per Order
TruRyde® Defender Oil Cap for 8K Axle - DC-O-288
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Price: $49.99
Lippert® Trailer Axle Oil and Dust Cap - 8,000 lbs. Clear - 695814
Lippert® Trailer Axle Oil and Dust Cap - 8,000 lbs. Clear - 695814
$9.99  FedEx  Flat Rate Shipping Per Order
  Easy, screw-in installation Designed for 8,000-lb. axle hubs O-ring and plug included for a complete seal Clear cap allows for better retention and visua
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Price: $16.99
Dexter 6K and 8K Screw-in and Dexter 9K (prior to 10/89) - K71-038-00Made In The USA
Dexter 6K and 8K Screw-in and Dexter 9K (prior to 10/89) - K71-038-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits Dexter 6K and 8K screw-in and Dexter 9K (prior to 10/89) 2⁷⁄₈"-12 thread. Replaced 021-029-00 oil cap. Dx Part No Quantity Descriptio
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Price: $29.99
Dexter 9K (after 10/89) and 10K, 12K, 15K, 4"-12 Threads Oil Cap - K71-148-00Made In The USA
Dexter 9K (after 10/89) and 10K, 12K, 15K, 4"-12 Threads Oil Cap - K71-148-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits Dexter 9K (after 10/89) and 10K, 12K, 15K, 4"-12 threads. Dx Part No Quantity Description
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Price: $41.99
Fits AL-KO and Hayes Axle 8K axles 1997 and newer. (K363587) - K71-845-00Made In The USA
Fits AL-KO and Hayes Axle 8K axles 1997 and newer. (K363587) - K71-845-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits AL-KO and Hayes Axle 8K axles 1997 and newer. (K363587)
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Price: $31.99
Fits Dexter 6 bolt and utility hubs, 2⁵⁄₈"-12 thread - K71-747-00Made In The USA
Fits Dexter 6 bolt and utility hubs, 2⁵⁄₈"-12 thread - K71-747-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits Dexter 6 bolt and utility hubs, 2⁵⁄₈"-12 thread
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Price: $51.99
Oil Cap for AL-KO and Hayes Axle 10,000 lbs. to 16,000 lbs. Trailer Axles - K71-859-00Made In The USA
Oil Cap for AL-KO and Hayes Axle 10,000 lbs. to 16,000 lbs. Trailer Axles - K71-859-00
$9.99  FedEx  Flat Rate Shipping Per Order
Made In The USA
Fits all AL-KO and Hayes Axle, 10K - 16K axles. (K568220)
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Price: $40.99
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