Premium TC Bros Coped Steel Bungs for Round Tubing
TC Bros coped steel bungs are precision-engineered fabrication components designed specifically for welding to round tubing. These bungs feature a curved notch (cope) that fits flush against round frame tubes, creating a professional, finished appearance with maximum weld surface area. Perfect for custom motorcycle builds where you're mounting components to round tubing.
Available Options:
Thread Sizes: 5/16-18 or 3/8-16 Lengths: 1/2", 1", or 1.5"
5/16-18 Thread / 1/2" Long - Compact size for tight spaces on round tubing
5/16-18 Thread / 1" Long - Standard length for most round tube applications
5/16-18 Thread / 1.5" Long - Extended length for thicker materials or additional thread engagement
3/8-16 Thread / 1/2" Long - Larger thread for heavier components on round tubing
3/8-16 Thread / 1" Long - Most popular size for general round tube fabrication
3/8-16 Thread / 1.5" Long - Maximum strength for heavy-duty round tube applications
Key Features:
Coped Design - Curved notch fits flush on round tubing for professional appearance
Maximum Weld Surface - Curved base provides more contact area for stronger welds
Precision Threading - Clean, accurate threads for reliable fastener engagement
Multiple Sizes - Six configurations to match your specific needs
Quality Steel Construction - Durable materials for long-lasting performance
Professional Quality - Manufactured to TC Bros' exacting standards
Why Choose Coped Bungs:
Coped bungs are the preferred choice when welding to round tubing (frame tubes, handlebars, sissy bars, etc.). The curved notch matches the radius of the tubing, allowing the bung to sit flush against the surface. This creates a cleaner appearance than standard flat-base bungs and provides more weld surface area for a stronger, more reliable connection.
Common Applications:
Mounting to round frame tubes
Sissy bar mounting on round tubing
Handlebar mounting points
Fender strut mounting to round bars
Luggage rack mounting to round tubing
Any application where you're welding to round tubing
Other Fabrication Hardware Options:
Depending on your specific application, you might need a different style of bung or mounting solution:
Alternative Bung Styles:
Standard Threaded Steel Bungs - Traditional flat-base bungs for welding to flat surfaces or when coping isn't required. Best for gas tanks, seat pans, and flat mounting surfaces.
Counterbore Steel Bungs - Designed specifically for socket head bolts with a recessed counterbore for flush, low-profile installations. Ideal for visible mounting points where clean appearance matters.
Radius Style Steel Bungs - Feature a radiused base for improved weld penetration and strength. Best choice for high-stress applications on flat or slightly curved surfaces.
Non-Threaded Mounting Solutions:
Weld-On Steel Mounting Tabs - When you need to mount brackets, fenders, or accessories without threaded fasteners, our mounting tabs provide secure weld-on mounting points in 7 different styles.
Specifications:
Material: Steel
Thread Sizes: 5/16-18 or 3/8-16
Lengths: 1/2", 1", or 1.5"
Style: Coped (curved notch for round tubing)
Finish: Raw steel (ready for welding and finishing)
Perfect For:
Custom motorcycle frame building with round tubing
Chopper and bobber builds
Cafe racer and tracker conversions
Hardtail frame fabrication
Sissy bar installations
Professional fabrication shops
DIY custom builders
Installation Notes:
These coped bungs are designed to be welded onto round tubing at the desired mounting location. The curved notch should fit flush against the tubing for maximum weld surface area. We recommend:
Verify the cope matches your tubing diameter for proper fitment
Test-fit components before welding bungs in place
Ensure proper clearance for fasteners and moving parts
Use appropriate welding techniques for your material
Clean and prep mounting area before welding
Paint or powder coat after installation to prevent rust
Use correct thread size for your application (5/16-18 for lighter components, 3/8-16 for heavier)
Professional installation is recommended if you're not experienced with welding and frame fabrication. Each TC Bros coped steel bung is precision-manufactured to exacting standards for reliable performance and professional appearance on your custom motorcycle build.
TC Bros Universal Frisco Gas Tank Mounting Kit - Stainless Hardware with Tophat Bungs
Regular price
$56.95
🚚 Free Canada-wide shipping on orders over $199
TC Bros Universal Frisco Gas Tank Mounting Kit
Mount your gas tank with confidence using this complete Frisco-style mounting kit. Everything you need for a professional, secure installation on custom choppers and bobbers.
Complete Kit Includes
3/8-16 stainless steel button head bolts - Corrosion-resistant hardware for long-lasting durability
1018 mild steel tophat bungs - Precision-engineered weld-on mounts for secure tank attachment
Leather cushion washers - Protect your tank finish and dampen vibration
Stainless steel washers - Complete the professional installation
Key Features
Universal Frisco-style design - Classic mounting solution for custom gas tanks
Premium materials - Stainless steel fasteners resist rust and corrosion
Complete hardware package - No need to source individual components
Professional finish - Button head bolts provide a clean, low-profile look
Vibration dampening - Leather washers protect tank paint and reduce metal-to-metal contact
Applications
This mounting kit is ideal for custom motorcycle builders working on choppers, bobbers, and cafe racers. The Frisco-style mounting system is a time-tested solution that provides secure tank attachment while maintaining the clean lines of a custom build.
Installation Note: Tophat bungs require welding to the frame. Ensure proper fitment and alignment before welding.
TC Bros.-Leather Cushion Washers with 3/8 inch Hole 10 pack
Regular price
$13.95
🚚 Free Canada-wide shipping on orders over $199
Leather Cushion Washers with 3/8 inch Hole 10 pack
These leather washers are perfect for protecting your paint and are more durable than rubber. The cushioning & dampening effect that these washers provide is perfect for installing between your frame and mounting tabs found on gas tanks, fenders, oil tanks, or anything else you want to protect from vibration. Also great for use under solo seat springs to prevent squeaking. Dimensions are 1 inch diameter x 3/8 inch hole x 1/8 inch thick. Sold in pack of 10 washers.
TC Bros - Weld On Solo Seat Mount
Regular price
$77.95
🚚 Free Canada-wide shipping on orders over $199
Weld On Solo Seat Spring Mounts
TC Bros. Choppers pair of Custom Weld on Chopper/Bobber Solo Seat Spring mounts.
Great for torsion style seat springs.
CNC Machined from 1018 cold rolled steel and are ready to weld on. Stainless Steel Studs are 5/16"-18 thread and base is 1" diameter with a 1 1/8" radius coped into the mount. Easily fits 1" and 1 1/4" cross tubes.
TC Bros. bungs are perfect for building custom riser-less handlebars. Proudly made in the USA from premium American 1018 cold rolled steel for easy welding.
These bungs are designed to fit inside 1" outer diameter steel tubing with a maximum wall thickness of .120" (11 gauge). A machined chamfer allows for proper weld penetration. These bungs feature 1/2-13 internal threads for mounting to Harley Davidson® style triple trees. Your handlebar mounting bolts pass through the bottom of the triple trees and thread into these bungs for a much cleaner installation as compared to traditional clamp style risers.
The 1" diameter is a perfect match to your tubing and the 1-1/4" overall length allows for sufficient thread engagement. See photos for all dimensions.
