When the back end of your suspension needs a solid mount, this spring keeper bolt gives you the strength and fit you can count on. The 1/2" diameter steel bolt attaches the leaf spring to the rear hanger so the slipper spring slides in smoothly and rests exactly where it should. It keeps the setup stable, letting the suspension move the way it’s designed to without shifting or binding.
Suspension hardware takes a beating over time, especially when the trailer is loaded heavy or runs rough roads. This 4-1/2" long, Grade 2 bolt holds up under pressure to keep the rear slipper spring connection tight and consistent. The 1/2"-20 threading gives a secure bite when paired with the matching locknut (sold separately), ensuring the spring stays locked in place mile after mile.
When worn or rusted bolts need swapping, this one fits right in. Designed specifically for mounting slipper springs inside rear hangers, it’s an easy way to bring the suspension back to full strength. Just slide the spring into place, run the bolt through, and secure it with the locknut. It’s a straightforward fix that keeps your trailer tracking straight and riding steady.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Speaker 1: Today we're gonna take a look at the four and a half inch-long spring keeper bolt for heavy-duty axles. This is a half-inch diameter spring retainer bolt. It's used to mount slipper springs inside the rear hanger. Basically, the slipper spring will slide into the hanger and rest on this bolt. Now there is a lock nut that's required. We do sell that separately, and it is listed on our website under this product as a related part.
It's part number 12N-Z. Now this bolt is designed for use on 10,000 pound, 12,000 pound, and 15,000 pound heavy-duty axles.A few specs on this bolt. It is a grade 2 bolt. The diameter again is half-inch diameter. It's 20 threads per inch, and a few measurements on this.
The length, which is measured from under the head to the very end of the bolt is four and a half inches in length. The threaded section is one and a quarter inches.But that should do it for the review on the four and a half inch-long spring keeper bolt for heavy-duty axles.
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