TC Bros Counterbore Steel Bungs for Socket Head Bolts (5/16" & 3/8")
Premium TC Bros Counterbore Steel Bungs for Socket Head Bolts
TC Bros counterbore steel bungs are precision-engineered fabrication components specifically designed for socket head bolt applications. These American-made bungs feature a recessed counterbore that allows socket head cap screws to sit flush with the surface, creating a clean, low-profile installation. Perfect for custom motorcycle builds where aesthetics and functionality are equally important.
Available Sizes:
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5/16" Counterbore - For 5/16" socket head cap screws (pack of 4)
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3/8" Counterbore - For 3/8" socket head cap screws (pack of 4)
Key Features:
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Counterbore Design - Recessed cavity allows socket head bolts to sit flush for clean appearance
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Made in USA - Quality American manufacturing from 1018 cold rolled steel
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Precision Machined - Accurate counterbore dimensions for perfect bolt fitment
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Low-Profile Installation - Socket head sits flush, eliminating protruding bolt heads
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Professional Quality - Manufactured to TC Bros' exacting standards
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Pack of 4 - Convenient quantity for most mounting applications
Why Choose Counterbore Bungs:
Counterbore bungs are the preferred choice when you want a clean, finished appearance without protruding bolt heads. The recessed counterbore allows the socket head cap screw to sit flush with or below the surface, creating a sleek, professional look. This design is especially popular for visible mounting points on gas tanks, seat pans, and other components where aesthetics matter.
Common Applications:
- Gas tank mounting with flush bolts
- Seat pan mounting
- Fender mounting
- Battery box mounting
- Visible mounting points where clean appearance is important
- Custom fabrication projects requiring low-profile fasteners
Other Fabrication Hardware Options:
Depending on your specific application, you might need a different style of bung or mounting solution:
Alternative Bung Styles:
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Standard Threaded Steel Bungs - Traditional flat-base bungs with standard internal threads. Best for applications using hex head bolts or where flush mounting isn't required. Available in more length options (1/2", 1", 1.5").
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Coped Steel Bungs - Feature a curved notch that fits flush on round tubing. Perfect when welding to frame tubes or round bars for a professional appearance.
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Radius Style Steel Bungs - Feature a radiused base for improved weld penetration and strength. Best choice for high-stress applications.
Non-Threaded Mounting Solutions:
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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: 1018 Cold Rolled Steel
- Sizes: 5/16" or 3/8" counterbore
- Quantity: Pack of 4
- Made in USA
- Designed for socket head cap screws
- Finish: Raw steel (ready for welding and finishing)
Perfect For:
- Custom motorcycle frame building
- High-end custom builds where aesthetics matter
- Chopper and bobber builds
- Cafe racer and tracker conversions
- Professional fabrication shops
- DIY custom builders seeking professional results
Installation Notes:
These counterbore bungs are designed to be welded onto your motorcycle components at the desired mounting location. The counterbore must face outward to accept the socket head cap screw. We recommend:
- Verify correct counterbore size for your socket head bolts before ordering
- Test-fit socket head cap screws before welding bungs in place
- Ensure counterbore faces the correct direction for bolt installation
- Use appropriate welding techniques for your 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 counterbore steel bung is precision-manufactured in the USA to exacting standards for reliable performance and professional appearance on your custom motorcycle build.
