Collection: Weld on fittings - Speedflow

Speedflow Weld-On Fittings - AN, NPT, ORB & O2 Sensor Weld Bungs

SS Racetech stocks a comprehensive range of Speedflow weld-on fittings — essential components for creating robust, leak-free connections in custom automotive fabrication. Whether you're building a fuel tank, oil system, coolant circuit, or custom headers, weld bungs give you a permanent, professional-grade port that accepts standard AN, NPT, or ORB fittings. Available in 6061-T6 aluminium and stainless steel to suit your application.

Female Weld Bungs

• 990 Series Female ORB Weld Bung: Available in steel or aluminium. A reliable O-ring Boss port weld bung for professional fabrication — ideal for oil systems and hydraulic lines
• 997 Series Female NPT Weld Bung: Precision-machined for a secure, leak-free NPT connection. The go-to choice for custom setups and existing system upgrades

Male Weld Bungs

• 999 Series AN Male Weld Bungs: Precision-machined for superior corrosion resistance — weld into tanks, sumps, and reservoirs for a clean AN port
• 999 Series AN Male Hex Weld Bung — Aluminium: Lightweight 6061-T6 aluminium with superior weldability and corrosion resistance. Hex body for easy installation with a spanner

Speciality Weld Fittings

• Filler Cap & Weld Bung Assemblies: Non-vented cap with internal O-ring for a secure, hand-tightened seal. Ergonomic finger grips for easy operation — ideal for tanks, oil fillers, and custom dry sump applications
• 989 Series O2 Sensor Weld Bung: M18 x 1.5 weld fitting designed to accept standard M18 O2 sensors. Perfect for custom headers, engine management, and data logging applications

Related Components

Complete your custom fabrication with complementary components:

• Speedflow AN Fittings: Complete range of AN hose ends and adapters to pair with your weld bungs
• Speedflow Braided Hose: Stainless braided hose for fuel, oil, and coolant lines
• AN to NPT Adapters: 816 Series AN flare to NPT adapters for connecting AN lines to NPT ports
• Fuel Systems: Fuel pumps, regulators, filters, and complete AN plumbing components
• Engine Accessories: Complete range of performance engine components