The best 6K trailer axle kit depends on matching the axle’s hubface and spring-center measurements to your trailer. The four Trailer Parts Outlet kits below include a 6,000-pound idler axle and suspension hardware in different sizes; choose the one that matches your existing setup. The SEHNSUCHT kit is a spring-and-hardware option, not a complete axle replacement, and may suit buyers replacing suspension parts only.
| Product | Best For | Key Dimensions |
|---|---|---|
| Trailer Parts Outlet 85/70 | Compact, matching setups | 85-inch hubface, 70-inch spring center |
| Trailer Parts Outlet 89/74 | Mid-size, matching setups | 89-inch hubface, 74-inch spring center |
| Trailer Parts Outlet 73/58 | Narrower, matching setups | 73-inch hubface, 58-inch spring center |
| Trailer Parts Outlet 95/80 | Wider, matching setups | 95-inch hubface, 80-inch spring center |
| SEHNSUCHT Spring Kit | Spring and suspension repairs | 25-1/4-inch springs |
Trailer Parts Outlet 85-Inch Axle Kit
This complete single-axle kit has an 85-inch hubface and a 70-inch spring center. It includes a 6,000-pound idler axle, two 3,000-pound, 25.25-inch, five-leaf double-eye springs, a 6K U-bolt kit, and a double-eye hanger kit. The listed bolt pattern is 6×5.5.
Best for: Trailer owners whose existing axle and suspension measurements match 85 inches hubface and 70 inches spring center. It was selected as a complete replacement package, with running-gear components supplied together. The axle uses high-strength steel tube construction.
Check before ordering: Do not choose this kit based on capacity alone. A mismatch in either measurement or the bolt pattern can prevent a proper fit.
Trailer Parts Outlet 89-Inch Axle Kit
This 6K single-axle package measures 89 inches hubface to hubface and 74 inches between spring centers. The kit includes one 6K idler axle, two 3K five-leaf double-eye springs measuring 25.25 inches, a 6K U-bolt kit, and a double-eye hanger kit. It has a 6×5.5 bolt pattern.
Best for: Buyers replacing a setup with these specific dimensions who want the axle and suspension hardware packaged together. Its 89-by-74-inch sizing makes it a different fit from the 85/70 and 95/80 options, despite the same stated axle capacity.
Check before ordering: Confirm both measurements on the trailer. The package description does not establish fit for trailers with different hanger locations or wheel bolt patterns.
Trailer Parts Outlet 73-Inch Axle Kit
This is the narrowest complete axle option in this selection, with a 73-inch hubface and 58-inch spring center. Its package includes a 6,000-pound idler axle, two 3,000-pound 25.25-inch five-leaf double-eye springs, a 6K U-bolt kit, and a double-eye hanger kit. The bolt pattern is 6×5.5.
Best for: Owners whose trailer calls for the compact 73/58-inch layout and who need both an axle and suspension components. The included hardware and springs make it a more complete option than a spring-only repair kit.
Check before ordering: Its narrower dimensions are not interchangeable with the other axle kits just because all are rated at 6,000 pounds. Verify the trailer’s measurements and mounting arrangement first.
Trailer Parts Outlet 95-Inch Axle Kit
The 95/80 kit has the largest dimensions among the complete axle packages listed here: a 95-inch hubface and an 80-inch spring center. It includes one 6K idler axle, two 3K-rated 25.25-inch five-leaf double-eye springs, a 6K U-bolt kit, and a double-eye hanger kit. The listed bolt pattern is 6×5.5.
Best for: Buyers whose existing trailer requires the wider 95-inch hubface and 80-inch spring-center layout. It provides the same general component set as the other Trailer Parts Outlet kits, with measurements suited to a wider configuration.
Check before ordering: A wider axle is not an upgrade by default. Choose it only when its measurements match the trailer and wheel setup.
SEHNSUCHT Five-Leaf Spring Kit
This is a suspension replacement kit rather than a complete axle kit. It includes two 3,000-pound-capacity, five-leaf springs with 25.25-inch eye-to-eye length, plus two U-bolt kits. The listed spring width is 1.75 inches, with 9/16-inch bushings. The U-bolt hardware is specified for a 3-inch round axle and includes tie plates and nuts.
Best for: Owners replacing springs and related hardware while retaining a compatible axle. The product listing describes the springs as suitable for standard 5,200- to 6,000-pound trailer axles and as replacements for SW5 springs.
Check before ordering: This kit does not include a replacement axle. The listing also notes that the nuts should be tightened horizontally; confirm spring and axle dimensions before installation.
Buying Guide: How to Choose a 6K Trailer Axle Kit
Which measurements should you check?
Start with hubface and spring center. Hubface measures across the axle between the wheel-mounting surfaces; spring center measures between the centers of the leaf springs. Compare both figures with the trailer’s existing axle and suspension layout. The four complete kits differ in both measurements, so capacity by itself is not enough to identify the right option.
Do you need a complete axle or just suspension parts?
Choose a complete package if you need an axle as well as springs and mounting hardware. The four Trailer Parts Outlet options include a 6K idler axle, springs, a U-bolt kit, and a hanger kit. Choose the SEHNSUCHT kit only when replacing compatible springs and hardware; it does not include an axle.
How should you compare capacity and bolt pattern?
Check the trailer’s required axle capacity and wheel bolt pattern against the product information. The complete Trailer Parts Outlet kits list a 6×5.5 bolt pattern and a 6,000-pound axle capacity. The SEHNSUCHT listing describes two 3,000-pound springs, which is a separate component rating and does not make it a complete 6K axle package.
What should you confirm before ordering?
Verify hubface, spring center, spring length and width, axle diameter where relevant, and bolt pattern. Also confirm that the included hanger and U-bolt hardware matches the trailer’s arrangement. If measurements are uncertain, check the existing parts or consult a trailer service professional before selecting a replacement.
Frequently Asked Questions
What does a 6K trailer axle kit mean?
For the complete Trailer Parts Outlet kits listed here, 6K refers to the stated 6,000-pound axle capacity. It does not identify the axle’s dimensions or guarantee compatibility with every trailer.
Are the four Trailer Parts Outlet kits interchangeable?
No. They have different hubface and spring-center measurements. Select the kit that matches the trailer’s required dimensions.
Does the SEHNSUCHT kit include an axle?
No. It is a spring-and-hardware kit with two springs and two U-bolt kits, not a complete axle replacement.
What is the difference between an idler axle and a spring kit?
An idler axle is the axle component included in the complete kits. A spring kit replaces suspension parts but does not supply the axle itself.