40-Pc SAE Tap & Die Set #4–1/2" | Internal & External Threading

Professional 40-Piece SAE Tap & Die Set – Precision Hand Threading for Every Project

Whether you're a seasoned machinist, a dedicated DIYer, or a professional tradesperson, this 40-Piece SAE Tap and Die Set delivers the versatility and precision you need for clean, accurate internal and external threading. Covering sizes #4 through 1/2" (SAE Inch), this comprehensive kit is the go-to solution for cutting new threads or restoring damaged ones on bolts, nuts, pipes, and more.

Made in Mainland China.

Why Choose This Tap & Die Set?

• Complete 40-Piece Kit: Includes taps, dies, and a hand threading wrench — everything you need for both internal and external threading jobs in one organized set.
• SAE Inch Sizing (#4 to 1/2"): Covers the most commonly used thread sizes in American standard (SAE) applications, ideal for automotive, plumbing, machinery, and general metalworking.
• Durable Construction: Crafted from high-quality alloy steel for long-lasting sharpness, strength, and wear resistance — built to handle repeated use on steel, iron, aluminum, and other materials.
• Precision-Cut Threads: Each tap and die is precision machined to deliver clean, accurate threads with minimal effort, reducing the risk of cross-threading or stripping.
• Ergonomic Hand Threading Wrench: The included wrench provides comfortable, controlled torque for smooth operation on both taps and dies.
• Organized Storage Case: Keeps all 40 pieces neatly stored and easy to locate, protecting your tools and making transport hassle-free.
• Versatile Applications: Perfect for automotive repair, plumbing, HVAC, manufacturing, hobbyist metalworking, and general maintenance tasks.

What's Included

• Taps: Full range from #4 to 1/2" SAE sizes (UNC & UNF)
• Dies: Matching external thread dies for each size
• Hand threading T-handle wrench
• Die stock handle/wrench
• Organized carry case

Technical Specifications

• Thread Standard: SAE Inch (UNC/UNF)
• Size Range: #4 to 1/2"
• Piece Count: 40 pieces
• Material: High-quality alloy steel
• Application: Internal threading (taps) & external threading (dies)
• Power Source: Manual / hand-operated
• Origin: Mainland China

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Learn More About Thread Standards

For more information on threading standards and tool safety, visit the OSHA Hand & Power Tools Safety Resource — an authoritative guide for safe hand tool use in professional and home workshop settings.

Frequently Asked Questions

Q: What thread standard does this SAE tap and die set use?

A: This 40-piece set is built to SAE Inch standards, covering both UNC (Unified National Coarse) and UNF (Unified National Fine) thread types in sizes ranging from #4 to 1/2". It is not metric — for metric applications, a separate metric tap and die set would be needed.

Q: What materials can these taps and dies cut threads in?

A: The alloy steel construction allows these taps and dies to cut threads in a wide range of materials, including mild steel, cast iron, aluminum, brass, copper, and most plastics. For hardened steel or stainless steel, extra care and cutting fluid are recommended for best results.

Q: Is a cutting fluid or lubricant required when using the set?

A: While not included, using a cutting fluid or tapping oil is strongly recommended for best performance and longevity. Lubricant reduces friction, improves thread quality, and extends the life of the taps and dies — especially when working with harder metals.

Q: Does the set include storage for all 40 pieces?

A: Yes! The set comes with an organized carry case that holds all 40 pieces securely. Each tap and die has a designated slot, making it easy to keep your tools sorted and protected between uses.