Seat Hardware

STAINLESS STEEL SEAT HINGE - POLISHED

Overview: This investment-cast stainless steel seat hinge from Biltwell may very well outlast the rest of your motorcycle. Cast in stainless steel and polished, it fits all solo seat pans with protruding hardware in the nose. Two long slots provide a broad range of fore/aft adjustability. This seat hinge features a steel frame bung with self-lubricating bronze pivot bushings. Finished off with a chrome-plated shoulder bolt to fasten the unit to your moto.

• Cast stainless steel
• Mirror polished
• Raw steel frame bung w/ bronze bushings
• Cast Biltwell logo
• Chrome shouldered Allen bolt included

Install Tip: For added insurance, use a drop of your favorite threadlocker when installing the pivot bolt.

Build Your Dream Custom Seat with Professional-Grade Mounting Hardware

Transform your bobber or chopper build with TC Bros' precision-engineered Weld On Solo Seat Spring Mounts. These CNC-machined mounts deliver the rock-solid foundation your custom seat deserves, combining old-school craftsmanship with modern manufacturing precision.

Why Riders Choose These Mounts

Imagine the satisfaction of a perfectly mounted solo seat that moves with you on every ride—no rattles, no flex, just smooth suspension action from your torsion springs. These aren't stamped sheet metal brackets that'll fail after a season. They're machined from solid 1018 cold rolled steel, built to handle years of hard riding.

Key Features

• CNC Machined Precision: Crafted from 1018 cold rolled steel for superior strength and durability
• Universal Fit Design: 1 1/8" radius cope fits both 1" and 1 1/4" cross tubes seamlessly
• Stainless Hardware: 5/16"-18 stainless steel studs resist corrosion and maintain clamping force
• Torsion Spring Compatible: Engineered specifically for torsion-style seat springs
• Weld-Ready Finish: Clean steel surface ready for your torch—no prep work needed
• Complete Kit: Includes 2 mounts, 2 stainless washers, 2 studs, and 2 nylock nuts

Technical Specifications

• Material: 1018 Cold Rolled Steel
• Stud Thread: 5/16"-18
• Base Diameter: 1"
• Cope Radius: 1 1/8"
• Tube Compatibility: 1" and 1 1/4" cross tubes
• Finish: Raw steel (weld-ready)
• Country of Origin: USA

What's in the Box

• 2 × CNC Machined Steel Mounts
• 2 × Stainless Steel Studs
• 2 × Stainless Steel Washers
• 2 × Nylock Nuts

Note: Seat springs sold separately

Installation Made Simple

The pre-coped radius means these mounts sit flush against your frame tube right out of the box. Position them where you want your seat, tack them in place, check your alignment, then lay down a solid bead. The universal design gives you complete freedom to position your seat exactly where it feels right for your build.

Built by Builders, for Builders

TC Bros understands what custom motorcycle fabricators need because they're fabricators themselves. These mounts represent the same quality and attention to detail you'll find throughout their entire line of chopper and bobber components.

Ready to mount your custom seat the right way? Add these professional-grade spring mounts to your cart and take the next step in your build.

Chrome Seat Springs (pair)

Frame Mount Solo Seat Kit

• Designed for installing Drag Specialties large and small spring solo seats
• Includes spring mount bracket with 3" chrome springs, seat bracket, leather frame cover, and instructions
• Mount is black powder-coated, steel spring mount studs are stainless steel and all other hardware is zinc coated
• Height is determined based on spring style
• Made in the U.S.A.
• Fits 04-06, 10-20 XL
• Mounting kit only. Seat not included

Seat Thumb Screw 1/4 - 20

• Chrome one-piece steel construction
• Wide, deep radiused slot accepts quarter or flat screwdrivers
• Raised diamond knurl on edge
• 1/8" longer for easier seat installation with saddlebags or luggage racks
• Includes nylon washer
• Made in the U.S.A.

FXST and FLST Knurled Seat Bolt Kit - Chrome

• Includes two chrome 1/2"-13 x 5/8" knurled head finger bolts with O-rings

Add a nice billet touch to your ride by changing your cheap stock Phillips head seat bolt with our all-new OG Billet Seat Screw. Includes a matching billet cup washer with a built-in rubber damper specifically designed to reduce the likelihood of loosening over time, ensuring a more secure fit. Comes with our OG Billet Bottle Opener Keychain allowing you to easily install and remove the seat screw due to its mating machined socket. Available in all our anodized and chrome finishes.

Features

• Available in all our Anodized colors & Chrome finishes


• 
  Matching Billet Seat Screw Cup Washer included
  


• Built-in rubber vibration damper specifically designed to reduce the likelihood of loosening over time


• Machined OG logo


• Grooved contour for easy "on the go" installation using the supplied Keychain or standard socket


• 1/4-20 thread
  
  

Fitment

• Fit most late Harley-Davidson models

Installation

Click here for installation instructions

Premium Solo Seat Springs for Custom Motorcycle Builds

Upgrade your motorcycle's solo seat with these precision-engineered 2" seat springs, designed specifically for choppers, bobbers, and custom builds. Crafted from special gauge spring steel and carefully coiled to deliver the perfect balance of support and comfort on every ride.

Important: Springs are sold separately - Order the quantity you need for your specific seat configuration (most solo seats require 2 springs).

Key Features

• Special Gauge Spring Steel - Engineered for durability and long-lasting performance
• Precision Coiled - Carefully manufactured to ensure optimal tension and consistent ride quality
• 2" Spring Height - Ideal dimensions for solo seat applications
• Black Finish - Sleek appearance that complements custom builds
• Universal Fit - Compatible with most solo seat pans and mounting hardware

Perfect For

Whether you're building a custom chopper, restoring a classic bike, or upgrading your bobber's seat, these springs provide the reliable suspension you need. The black finish integrates seamlessly with most seat hardware and pan configurations.