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Stainless NPT Bungs
NPTss$3.75 - $5.50Stainless Steel NPT Weld-In Bungs – Precision Machined These stainless steel NPT weld-in bungs are machined from solid stainless steel bar stock, then drilled and tapped to -
Aluminum NPT Bungs
NPTal$3.75 - $5.506061 Aluminum NPT Weld-In Bungs – Lightweight & Corrosion-Resistant These NPT weld-in bungs are precision-machined from solid 6061-T6 aluminum bar stock and tapped to -
Stepped NPT bungs
SNPT$4.25 - $8.001018 Mild Steel NPT Weld-In Bungs – Multiple Thread Sizes Available These weld-in NPT threaded bungs are precision-machined from solid 1018 cold rolled mild steel round stock -
Stainless Stepped NPT bungs
SNPT-SS$4.95 - $11.95Stainless Steel NPT Weld-In Bungs – Multiple Sizes Available Our premium 300 series stainless steel NPT threaded weld-in bungs are precision-machined from solid round stock and tapped to your... -
Aluminum Stepped NPT bungs
SNPT-AL$4.25 - $5.75Aluminum NPT Weld-In Bungs – 6061-T6 – Multiple Sizes Available Our 6061-T6 aluminum NPT weld-in bungs are expertly machined from high-strength round stock and tapped to your selected NPT thread size...
Description
1018 Mild Steel NPT Weld-In Bungs – Multiple Sizes Available
These NPT weld-in bungs are precision-machined from solid 1018 cold rolled mild steel bar stock, then drilled and tapped to National Pipe Thread (NPT) standards for secure, leak-free fittings. Designed to be welded directly into fuel tanks, oil bags, and fluid reservoirs, they’re ideal for custom fabrication projects in automotive, motorcycle, and industrial applications.
Known for its excellent weldability and strength, 1018 mild steel is a reliable choice for builders who demand clean welds and durable performance. Available in multiple lengths and outer diameters based on thread size, including a longer 2" option for extended applications, like petcocks on a frisco style tank.
Available Sizes & Pricing:
| Part # | NPT Thread | Length | Material | Outer Diameter | Price |
|---|---|---|---|---|---|
| NPT186 | 1/8" NPT | 0.650" | 1018 Cold Rolled Steel | 5/8" | $3.00 |
| NPT147 | 1/4" NPT | 0.750" | 1018 Cold Rolled Steel | 3/4" | $3.75 |
| NPT381 | 3/8" NPT | 0.500" | 1018 Cold Rolled Steel | 7/8" | $4.50 |
| NPT382 | 3/8" NPT | 2.000" | 1018 Cold Rolled Steel | 7/8" | $5.50 |
Key Features:
Made from 1018 cold rolled mild steel for superior weldability
Tapped to standard NPT threads for use with common fittings
Weld-in design for custom fuel, oil, and overflow tank applications
Multiple sizes, including long-length option for deep wall assemblies
Ideal for motorcycles, hot rods, off-road builds, and more
Whether you're building a Harley oil tank, a hot rod fuel system, or a custom off-road reservoir, these bungs deliver dependable results and a clean professional finish.