Fabrication Parts

TC Bros Tophat Style Bung - 3/8-16 Blind Threaded Weld-On Mount

Create professional, leak-free mounts for gas tanks, oil tanks, and custom fabrication projects with these precision-engineered tophat bungs.

Key Features

• Blind threaded design - 3/8-16 internal thread prevents leaks, ideal for fluid-tight applications
• Premium 1018 cold rolled steel - American-made material welds easily and provides superior strength
• Tophat profile - 7/8" diameter flange creates a clean, professional finish
• Easy installation - Insert into 5/8" diameter hole and weld around the flange
• Versatile mounting solution - Perfect for tanks, risers, controls, and custom fabrication

Specifications

• Thread: 3/8-16 blind (internal)
• Installation hole diameter: 5/8"
• Flange diameter: 7/8"
• Material: 1018 cold rolled steel
• Quantity: Pack of 4
• Made in USA

Applications

These tophat bungs are essential hardware for custom motorcycle builders and fabricators. Use them for mounting gas tanks, oil tanks, battery boxes, fenders, or any component requiring a secure, leak-proof threaded connection.

Pro Tip: The blind thread design means the threaded hole doesn't go all the way through, making these bungs ideal for applications where you need a watertight or fuel-tight seal.

TC Bros Horseshoe Oil Tank - 1982-2003 Sportster Hardtail Kit

Complete your Sportster hardtail build with this classic horseshoe-style oil tank. Precision-engineered for 1982-2003 Harley Sportster hardtail conversions, this tank delivers authentic chopper styling with reliable performance.

Fitment

• Application: Harley-Davidson Sportster 1982-2003 (hardtail conversions)
• Compatibility: Designed specifically for TC Bros Sportster Hardtail Kits
• Style: Horseshoe profile
• Weight: 1.5 lbs

Key Features

• Classic horseshoe design - Iconic chopper styling that defines the hardtail aesthetic
• Sportster-specific engineering - Precision-designed for 1982-2003 Sportster hardtail conversions
• Complete mounting solution - Includes all necessary hardware for installation
• Premium American construction - Built to TC Bros quality standards
• Made in USA - American craftsmanship and quality control
• Perfect companion to TC Bros hardtail kits - Engineered to work seamlessly with TC Bros Sportster hardtail frames

Why Choose a Horseshoe Oil Tank?

The horseshoe oil tank is a defining element of classic chopper and bobber builds. Its distinctive curved shape not only looks incredible but also provides practical oil capacity for your Sportster's dry-sump lubrication system. When you convert to a hardtail, you need a reliable external oil tank solution—this horseshoe tank delivers both form and function.

What's Included

• Horseshoe oil tank
• Mounting hardware
• Installation instructions

Installation Notes

This oil tank is designed to mount to TC Bros Sportster hardtail kits for 1982-2003 models. Professional installation recommended to ensure proper oil system function and leak-free operation.

Complete Your Sportster Hardtail Build

This horseshoe oil tank pairs perfectly with the TC Bros Sportster Hardtail Kit for 1982-2003. Browse our complete selection of TC Bros Sportster parts, fenders, and fabrication hardware to complete your custom build.

5/16" Counterbore Bungs

These bungs are sold as a pair and can be purchased as mild or stainless steel and allow for the head of an allen bolt to sit flush inside. 

Outside measurements are as follows:

• 3/4" diameter
• .625" long

1/8" NPT Steel Bung

TC Bros. 1/8" NPT (National Pipe Thread) bungs are most commonly used for oil tank fittings or when building custom fuel level sight gauges.

Proudly made in the USA from premium American 1018 cold rolled steel for easy welding.

Note: NPT threads are tapered. They are only designed to be used with corresponding NPT threaded fittings or pipe. The tapered design allows the threads to create a leak-proof seal when tightened. They are not to be used with standard bolts or hardware. These bungs install easily by inserting into a 5/8" diameter hole and welding around the 7/8" diameter flange. See photos for all dimensions.

Sold in pairs.

Weld-On Kick Stand for 1-1/8" Frame Tubing - Chrome

Get rid of your ugly stock kickstand and replace it with TC Bros. super clean black kickstand with hidden spring.

Kit includes a chrome kickstand and weldable steel block coped to fit 1-1/8" tubing on your frame.

*not for use on kick-start models  

Weld-On Kick Stand for 1-1/4" Frame Tubing - Chrome

Get rid of your ugly stock kickstand and replace it with TC Bros. super clean black kickstand with hidden spring.

Kit includes a chrome kickstand and weldable steel block coped to fit 1-1/4" tubing on your frame.

*not for use on kick-start models  

Gas Tank Sight Glass Kit (with steel weld in bung)

Want a sight gauge on your gas or oil tank but don't want bulky lines and fittings hanging off the side. TC Bros. has the solution! Crystal clear glass viewing lens sealed tight into a CNC machined brass housing. Also included is a forged 3/4" NPT mild steel bung for easy welding.