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.
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
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 - Heavy Duty Oil Tank Mounting Kit
Regular price
$97.95
Heavy Duty Oil Tank Mounting Kit
Use this kit to mount TC Bros. Oil Tanks to our Sportster Hardtail.
Can also be used for universal applications. Made in USA
TC Bros Weld-On Rear Fender Mounts
Regular price
$19.95
Premium Weld-On Rear Fender Mounts for Custom Motorcycles
TC Bros weld-on rear fender mounts provide secure, professional mounting solutions for rear fenders on custom motorcycle builds. These precision-manufactured steel mounts are designed to be welded onto your frame, offering three distinct styles to match your build requirements and aesthetic preferences.
Available Styles:
Single Hole - Minimalist design with single mounting hole for clean, simple installations
Standard - Classic dual-hole design for secure, traditional fender mounting
Ribbed - Enhanced design with ribbed reinforcement for maximum strength and distinctive styling
Key Features:
Durable Steel Construction - Built to withstand the rigors of motorcycle use
Precision Manufactured - Consistent quality and reliable fitment
Weld-On Design - Permanent, secure mounting to your frame
Multiple Styles - Choose the design that matches your build aesthetic
Professional Quality - Trusted by custom builders and fabricators
Versatile Applications - Compatible with various fender types and custom builds
Choosing the Right Style:
Single Hole: The minimalist single hole design is perfect for builders who want a clean, simple look with minimal hardware visible. Ideal for lightweight fenders and builds where simplicity is key. The single mounting point provides adequate support for most rear fender applications while maintaining a sleek profile.
Standard: The classic dual-hole design offers traditional styling with proven reliability. Two mounting holes provide secure attachment points for your fender struts or mounting hardware. This is the most versatile option, working well with virtually any custom build style from choppers to bobbers to cafe racers.
Ribbed: The ribbed design adds structural reinforcement through integrated ribs, providing maximum strength for heavy-duty applications. The ribbed pattern also adds a distinctive visual element that complements builds with other ribbed or finned components. Perfect for larger fenders, touring customs, or builds where extra strength is desired.
Specifications:
Material: Steel
Mounting Type: Weld-On
Styles: Single Hole, Standard (Dual Hole), Ribbed
Finish: Raw steel (ready for paint or powder coating)
Perfect For:
Custom motorcycle frame building
Chopper and bobber builds
Cafe racer and tracker conversions
Rear fender installations
Frame modifications and upgrades
Professional fabrication shops
DIY custom builders
Installation Notes:
These fender mounts are designed to be welded onto your motorcycle frame at the desired mounting location. Proper positioning and alignment are critical for correct fender fitment and appearance. We recommend:
Test-fit your fender and mounts before welding
Ensure proper clearance for tire, suspension travel, and chain/belt
Use appropriate welding techniques for your frame material
Clean and prep mounting area before welding
Paint or powder coat after installation to prevent rust
Professional installation is recommended if you're not experienced with welding and frame fabrication. Each TC Bros fender mount is manufactured to exacting standards for reliable performance on your custom motorcycle build.
Transform your Harley Sportster into a classic hardtail chopper or bobber with this precision-engineered weld-on hardtail kit. Designed for builders who demand quality and performance, this kit delivers a professional rigid frame conversion.
Accommodates 130-150mm tire widths - Versatile fitment for vintage and modern tire sizes
Precision-engineered weld-on design - Professional-grade construction for permanent installation
Complete hardtail conversion kit - Everything needed for a rigid frame transformation
Premium American steel construction - Built to TC Bros exacting quality standards
Classic chopper/bobber styling - Authentic hardtail profile for custom builds
Tire Compatibility
This hardtail kit works with a wide range of tire sizes including:
130mm width tires (130/90, 130/80)
140mm width tires (140/90, 140/80)
150mm width tires (150/80, 150/70)
What's Included
This complete kit includes all necessary components for your Sportster hardtail conversion. Professional welding skills and equipment required for installation.
Important Installation Note: This is a weld-on hardtail kit that requires permanent modification to your motorcycle frame. Professional fabrication and welding experience is strongly recommended. Ensure proper fitment and alignment before welding.
Build Your Dream Bike: Pair this hardtail with TC Bros fenders, sissy bars, and fabrication hardware to complete your custom Sportster build.
