GREASE CAPS | AXLE CAPS

CUSTOM SIZING • GALVANIZED • ZINC AVAILABLE

axle grease caps

Buy Grease Caps / Axle Caps Direct From The Manufacturer

Wedge has over 64 presses with capacity from 3 to 400 tons.

Wedge has served as a manufacturer of grease caps for more than 20 years. Our durable axle caps are produced in the USA from quality galvanized steel and plain steel, and we offer them with a wide variety of plating options available.

  • Serving the Recreation Vehicle & Trailer Market
  • Sizes and Shapes to Your Specifications!
  • All Caps are Galvanized on Both Sides
  • Zinc Plated Caps Available

Beyond the standard grease caps and axle caps we list, we have the full capability to custom design and manufacture a cap that fits Your Custom Specifications.

By supporting the Boat Trailer, Utility Trailer, and Recreational Vehicle markets, we recognize that your inventories are critical, which is why we provide fast turnaround on grease caps and stocking programs to meet your demands.

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Grease Cap Customers

  • Monitor Manufacturing
  • Industrial Axle
  • Dexter Marine
  • Martin Wheel
  • QDS
  • Briggs & Stratton
  • MTD
  • Cequent Trailer Products
  • E-Z GO Textron
  • Snapper
  • Secondary Machining
  • Tie-Down Engineering
  • Dexter Axle
  • Redneck Trailer Supply
  • Martin Wheel
  • QDS

Grease Cap Specifications

Find the right fit for your trailer, browse our range of trailer grease cap sizes and specifications to match your axle and hub requirements.

A B C
Grease Cap Specifications Part
No.		 Diameter Length
Under Flange		 Overall
Height		 Mat
Thickness
trailer dust cap Note: Can be furnished
with 1-3/16″ diameter hole. * R = .650		 21-2 1.781 .27 .875 .03
21-3B 1.985 .31 1.20 .03
21-3A 1.990 .31 1.25 .03
21-1A 2.450 .25 1.34 .03
21-4 2.705 .533 2.063 .03
21-6 2.841 .37 1.12 .042
21-8 3.630 .50 1.875 .03
Rubber Plugs for Lube Caps
boat trailer grease caps 1478 Call for
available price/quantity breaks.
Wedge Rubber Plugs – Now Available In RED and YELLOW
A B C
Grease Cap Specifications Part
No.		 Diameter Length
Under Flange		 Overall
Height		 Mat
Thickness
grease caps, dust caps 21-41-1 1.990 .31 1.400 .03
21-42-1 2.450 .31 1.525 .03
21-43-1 2.725 .31 1.525 .03
21-44-1 3.630 .50 1.625 .03
A B C
Grease Cap Specifications Part
No.		 Diameter Length
Under Flange		 Overall
Height		 Mat
Thickness
grease caps, dust caps 21-39 2.720 .31 1.34 .06
1005 3.160 .38 1.78 .06
21-40 4.734 .236 1.811 .06
21-50 5.667 .437 1.656 .03

Ultimately, the choice between metal and plastic dust caps depends on the specific requirements of the application. If durability, heat resistance, and a longer lifespan are critical, metal dust caps may be the preferred choice. On the other hand, if corrosion resistance, lightweight design, and cost-effectiveness are more important, plastic dust caps might be a better fit. It’s essential to consider the environmental conditions, the level of stress the dust cap will undergo, and any specific requirements dictated by the application.

Axle Grease Cap FAQs

A grease cap, also known as a dust cap or hub cap, is a protective covering used in automotive and machinery applications to safeguard wheel bearings from contaminants and to retain lubricating grease within the bearing assembly.

No, trailer dust caps are not universally the same size. The size of trailer dust caps varies depending on the specific trailer axle and wheel assembly. Different trailer types and manufacturers use different hub and bearing setups, which means selecting the right wheel bearing dust cap by size is essential to ensure a proper fit and reliable protection.

The choice between metal and plastic dust caps depends on various factors, including the specific application, environmental conditions, and personal preferences. Both metal and plastic dust caps have their advantages and disadvantages.

Metal Dust Caps:

Durability: Metal dust caps, often made of steel or aluminum, tend to be more durable and resistant to wear and tear. They are less likely to crack or break under stress or harsh conditions.

Temperature Resistance: Metal dust caps typically have better heat resistance compared to plastic. This can be an important factor in applications where high temperatures are a consideration.

Longevity: Due to their durability, metal dust caps may have a longer lifespan, making them suitable for heavy-duty or high-impact environments.

Plastic Dust Caps:

Corrosion Resistance: Plastic dust caps are generally more resistant to corrosion, making them a good choice for applications where exposure to moisture or chemicals is a concern.

Lightweight: Plastic dust caps are lighter than metal ones, which may be advantageous in situations where minimizing weight is a priority, such as in certain automotive or aerospace applications.

Cost: Plastic dust caps are often less expensive than metal ones, making them a cost-effective choice, especially for applications where budget considerations are important.

Our wide selection of trailer dust cap sizes ensures a proper fit for a variety of trailer models. Each trailer axle grease cap is designed to protect wheel bearings from dirt, moisture, and other contaminants, helping to extend the life of your axle components and maintain smooth trailer operation.

We provide accurate bearing dust cap sizes to make maintenance and replacements simple and efficient. Using the correct trailer axle grease cap prevents corrosion, reduces wear on critical components, and keeps trailers running safely under heavy loads.

Choosing the right trailer dust cap sizes and bearing dust cap sizes is essential for long-term durability and reliable trailer performance. Our high-quality trailer axle grease cap products are built for a secure fit, protecting bearings and ensuring consistent performance over time.

Boat trailer grease caps protect wheel bearings by sealing the hub to prevent contamination from water, dirt, and debris, which is especially important for trailers frequently exposed to submersion and harsh environments.

A trailer dust cap is a small, round metal cover that fits tightly over the end of the hub. It typically has a smooth or slightly grooved finish and they also may sit flush with the hub or extend out a bit, depending on if it’s a drive-in or threaded type.
trailer dust cap sizes

An Aerospace
Certified Stamper

Certified to AS9100 Rev. D, Wedge Products is an experienced aerospace parts manufacturer providing stamped metal components to the aerospace, military and industry.

Durable Grease & Axle Caps

Protect wheel bearings with galvanized or zinc-plated caps made to fit your exact trailer or RV specs.