High-Precision HSS RC & G Series Pipe Threading Dies | Professional Piping Solutions

Problem: Pressure Leaks and Poor Thread Sealing

In hydraulic and pneumatic systems, the slightest imperfection in an external pipe thread can lead to costly fluid leaks and system failure.

Standard dies often fail to produce the exact 1:16 taper required for RC threads, resulting in a loose fit that cannot be sealed with PTFE tape or sealant.

Furthermore, torn threads on G-series pipes lead to cross-threading, making it impossible to achieve a secure, vibration-resistant mechanical connection.

Cause: Inaccurate Taper Geometry and Low-Grade Steel

Many budget pipe dies lack the CNC-ground precision needed to maintain the consistent 55 degree Whitworth thread angle required for G and RC standards.

Standard carbon steel dies quickly lose their edge when cutting into galvanized or stainless pipes, leading to distorted thread profiles and "burred" crests.

Without a specialized lead-in chamfer, starting a die on a large-diameter pipe is difficult, often leading to crooked threads that compromise the entire joint.

Solution: Fully Ground HSS-M2 Pipe Die Technology

Our RC and G Series Dies are manufactured from vacuum-hardened HSS-M2 to ensure the sharpest possible cutting edges and extreme wear resistance.

The RC series features a precision-engineered 1:16 taper, while the G series maintains a strict Class A tolerance for perfect cylindrical mechanical fits.

Each die is 100% CNC-ground to ensure the 55 degreen flank angle is perfect, providing a mirror-like finish that ensures 100% leak-proof performance.

Technical Specifications: G & RC Series (Common Sizes)

Application: Engineered for Leak-Proof Connections

Hydraulic Maintenance: Essential for creating precision external threads on hydraulic hoses, couplings, and adaptors used in heavy machinery.

Oil & Gas Pipelines: Specialized RC tapered dies for on-site threading of high-pressure gas lines where a metal-to-metal seal is required.

Industrial Plumbing: A must-have for G-series mechanical fittings in food processing plants, chemical facilities, and water treatment centers.

HVAC Systems: Reliable threading for copper and steel pipes in large-scale cooling and heating systems requiring consistent pitch accuracy.

Selection Guide: Professional Integration

1. Standard Identification: Use G Series for parallel threads where the seal is made by a washer or O-ring; use RC Series for tapered sealing.

2. Pipe Preparation: Ensure the pipe end is square and deburred. For RC threads, a slight chamfer helps the die's 1:16 taper engage correctly.

3. Lubrication Priority: Pipe threading generates significant heat due to the wide surface area of the thread; always use heavy-duty cutting oil to protect the HSS-M2 edge.

4. O.D. Matching: Check the Outer Diameter (O.D.) of the die against your die stock to ensure a stable fit for large-diameter pipe work.

Professional FAQ (Expert Support)

Q: Can a G-series die be used on an RC-series pipe?

A: No. G threads are parallel and RC threads are tapered. Mixing them will result in a joint that cannot be sealed and will likely leak under pressure.

Q: Why do your pipe dies have more chip holes than standard dies?

A: Pipe threads are much wider than bolt threads. The extra chip holes allow for the massive volume of metal removed to evacuate without clogging or tearing.

Q: Do you offer NPT dies for the North American market?

A: Yes. While G and RC are 55 degree Whitworth standards, we also manufacture a full range of NPT 60 degree American Pipe Standard dies.