The best tri-axle trailer suspension choice depends on whether you need to replace worn parts, refresh an EQ-310 system, or install spring hangers. The EQ-104 rebuild kit is suited to standard eye-to-eye springs and lists a 21,000-pound maximum GVW; the greaseable wet-bolt kit is a fit for owners prioritizing serviceable bolts. Match spring width, equalizer dimensions, and suspension style before ordering.
| Product | Best For | Key Detail |
|---|---|---|
| EQ-104 Rebuild Kit | Standard tri-axle wear-part replacement | Wet bolts, bronze bushings, and equalizers |
| 3-Inch Shackle Bolt Kit | Matching a specific shackle layout | For 1-3/4-inch springs |
| Spring Hanger Kit | Hanger-focused repairs | Corrosion-resistant material claimed |
| EQ-310 Greaseable Kit | EQ-310 system maintenance | Greaseable fittings |
| Greaseable Wet-Bolt Kit | Eye-to-eye spring wear parts | For standard 1-3/4-inch springs |
EQ-104 Tri-Axle Wet-Bolt Rebuild Kit
Best for: Owners replacing common wear components on a standard tri-axle suspension with eye-to-eye springs. This kit lists compatibility with standard 1-3/4-inch-wide leaf springs and trailers up to 21,000 pounds GVW.
Its listed contents include 24 hardened 9/16-by-3-inch wet bolts, 24 locking flange nuts, four EQ-104 equalizers, 24 bronze bushings, and 16 spring shackle straps. The equalizers measure 5.75 inches bolt-to-bolt wide and 2 inches from centerline to bolt hole.
Why it stands out: The substantial parts list supports replacing multiple suspension wear components together. Limitation: It is specified for eye-to-eye springs, not slipper springs, and the equalizer dimensions should be checked against the existing setup.
Tri-Axle Kit With 3-Inch Shackle Bolts
Best for: Buyers looking for a tri-axle rebuild kit specified for standard 1-3/4-inch-wide springs. The listing identifies the manufacturer part number as SRK-3A-SB-LE and gives a 4.75-inch hole-center measurement from the top hole to either side hole.
Why it was selected: Those measurements provide a starting point for comparing the kit with an existing suspension layout. Check the bolt pattern and component dimensions before purchase rather than relying on the general “tri-axle” description alone.
Limitation: The supplied product details do not list a complete parts inventory or state that the bolts are greaseable. Confirm the included components if you need a full-system replacement.
Tri-Axle Spring Hanger Kit
Best for: Trailer owners searching for a spring hanger component for a triple-axle leaf-suspension setup. The listing describes the product as a heavy-duty accessory for utility, boat, camper, and cargo trailers.
The supplied features say the material is high-strength and corrosion-resistant, intended to withstand exposure to rain, mud, road salt, and UV rays. The listing also claims the component helps limit wobbling, shifting, and unnecessary movement during transport.
Why it was selected: It addresses hanger-related repairs rather than only bolt or bushing replacement. Limitation: The provided details do not give dimensions, mounting-hole spacing, or a specific axle-weight rating. Verify fitment details with the seller before choosing it for a particular trailer.
EQ-310 Greaseable Tri-Axle Rebuild Kit
Best for: Owners whose tri-axle suspension uses EQ-310 equalizers and who want a rebuild kit with greaseable fittings. The listing describes it as a complete kit for restoring the suspension, though it does not enumerate every included part in the supplied specifications.
Why it was selected: Its EQ-310-specific fit and greaseable design make it a clearer choice for matching that equalizer system than a general-purpose kit. Greaseable fittings allow routine lubrication of the relevant components.
Limitation: The listed details do not specify all dimensions or the kit’s complete contents. Confirm that your current equalizer is EQ-310 and check the shackle measurements before ordering.
Greaseable Tri-Axle Wet-Bolt Kit
Best for: Owners of standard tri-axle systems with eye-to-eye springs who want a rebuild kit that includes greaseable wet bolts. The listing specifies standard 1-3/4-inch-wide leaf springs and says the kit replaces common suspension wear components.
Why it was selected: The stated spring type and width make its intended application easy to compare with a trailer’s existing setup. Greaseable wet bolts are the defining feature for buyers planning regular lubrication.
Limitation: It is not intended for slipper-style springs. The supplied details do not list exact bolt lengths, equalizer dimensions, or a complete parts count, so verify those specifications when they matter to your repair.
Buying Guide: How To Choose Tri-Axle Suspension Parts
What suspension style does your trailer use?
Start by identifying whether the trailer uses eye-to-eye leaf springs or slipper springs. Several kits above explicitly specify eye-to-eye springs and are not listed for slipper-style systems. A tri-axle label alone does not guarantee the kit matches your suspension design.
Do spring width and equalizer dimensions match?
Measure the spring width, bolt diameter and length, shackle length, and equalizer hole spacing. Compare those numbers with the product specifications and your existing parts. The 1-3/4-inch spring width appears in multiple listings, but equalizer dimensions differ or are not provided.
Should you choose wet bolts or a system-specific kit?
Wet bolts are greaseable fasteners intended to support routine lubrication. Choose a wet-bolt kit when its stated spring type, dimensions, and included parts match your trailer. For an EQ-310 suspension, prioritize a kit specifically identified for EQ-310 rather than assuming a general kit will fit.
When is a hanger kit the better option?
A hanger-focused product may suit a repair involving hanger components, but confirm the mounting measurements and rating first. If the repair also involves equalizers, bushings, or shackles, check whether those parts are included or need to be sourced separately.
Frequently Asked Questions
Can any tri-axle suspension kit fit any triple-axle trailer?
No. Spring style, spring width, equalizer design, bolt measurements, and hanger layout all affect fitment.
Are eye-to-eye and slipper springs interchangeable?
No. The listed kits that specify eye-to-eye springs should not be assumed to fit slipper springs.
What is a wet bolt?
A wet bolt is a greaseable suspension bolt. The product listings describe greaseable fittings as a way to lubricate suspension components.
What should I measure before ordering?
Check spring width, bolt dimensions, shackle length, equalizer spacing, and hanger mounting dimensions against the specific kit details.