Tie Down Engineering Fluted Shackle Bolt 86250, 3/8 in. X 3 in. Grade 5 Zinc-Plated Bolts with Nuts, Pair

The Tie Down Engineering Fluted Shackle Bolt (86250) is a 3/8 in. X 3 in. Grade 5 zinc-plated bolt set designed for use with trailer spring hanger brackets and equalizers. Each bolt features a fluted shank, a design engineered to prevent the bolt from turning inside the hanger bracket during installation or use. A bolt that spins in place can wear out the hanger bracket over time, so the fluting keeps the bolt fixed while the nut is tightened, protecting the bracket and helping the connection stay secure.

Built from Grade 5 steel with a zinc-plated finish, this bolt set resists corrosion in the wet, road-splash, and marine-adjacent environments common to boat trailer axles. The 86250 is sold as a pair, with each bolt shipping alongside a matching nut, giving you both fasteners needed for a spring hanger bracket or equalizer replacement in one package. This makes it a straightforward maintenance or upgrade part for trailer owners replacing worn, rusted, or damaged shackle hardware.

Specifications

• Brand: Tie Down Engineering
• Manufacturer Part Number: 86250
• Product Name: Fluted Shackle Bolt
• Bolt Size: 3/8 in. X 3 in.
• Material: Alloy Steel
• Grade Rating: Grade 5
• Finish: Zinc Plated
• Design: Fluted shank (prevents bolt from turning)
• Includes: Matching nuts
• Quantity: 2 bolts and 2 nuts (pair)
• Weight: 0.7 pounds
• UPC: 081628862508
• Package Dimensions: 6.75 x 3.75 x 1.63 inches

Fitment

• For use with trailer spring hanger brackets and equalizers

Frequently Asked Questions

What size is the Tie Down Engineering 86250 shackle bolt? The 86250 is a 3/8 in. X 3 in. Bolt, made from Grade 5 steel with a zinc-plated finish.

What is the 86250 shackle bolt used for? It is used with trailer spring hanger brackets and equalizers, providing the pivot bolt and nut needed to secure the bracket connection.

Why does the bolt have a fluted shank? The fluted design on the Tie Down Engineering 86250 keeps the bolt from turning while the nut is being tightened, which prevents the bolt from spinning and wearing out the hanger bracket.

How many bolts come in one package of the 86250? The 86250 is sold as a pair, so each package includes 2 fluted shackle bolts and 2 matching nuts.

Are nuts included with the 86250 shackle bolt? Yes, each bolt in the Tie Down Engineering 86250 set comes with a matching nut, so no separate nuts need to be purchased.

What material and grade is the 86250 bolt made from? It is made from Grade 5 alloy steel with a zinc-plated finish for corrosion resistance.

How much does the 86250 shackle bolt set weigh? The Tie Down Engineering 86250 pair weighs 0.7 pounds.

Will the 86250 fit any spring hanger bracket? The 86250 fluted shackle bolt is designed for use with spring hanger brackets and equalizers generally; it is not tied to a specific vehicle or trailer model in the manufacturer's listing.

Is the 86250 a genuine Tie Down Engineering part? Yes, 86250 is Tie Down Engineering's own part number for this fluted shackle bolt and nut set, not an aftermarket equivalent.

What is the difference between the 86250 and a standard hex bolt for a shackle? Unlike a plain hex bolt, the 86250's fluted shank resists turning once installed, which reduces wear on the spring hanger bracket over repeated use.

What is the UPC for the Tie Down Engineering 86250? The UPC for the 86250 fluted shackle bolt pair is 081628862508.