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| Brand Name: | XRTOOLS |
| Model Number: | M12*1.75 |
| MOQ: | 200PCS |
| Price: | $0.75-38.55/PCS |
| Delivery Time: | 45DAYS |
| Payment Terms: | L/C, D/P, T/T, Western Union |
In high-speed rotating machinery, standard right-hand (RH) threads can gradually unscrew due to centrifugal force, leading to catastrophic equipment failure. Finding high-precision LH dies in large diameters or fine pitches is often a major supply chain bottleneck for industrial maintenance teams. Operators often struggle with low-quality LH dies that lack clear directional marking, resulting in "backwards-threading" errors that destroy expensive workpieces.
Left-hand threading requires a perfect mirror image of the thread profile; any slight asymmetry in the grind will cause the thread to bind or strip. Because LH threads are often used in safety-critical rotating parts, the material is usually high-tensile, which quickly dulls standard carbon steel tools. Without specialized "Left-Hand" laser etching on the die face, it is easy to confuse LH tools with standard stock, leading to costly workshop mistakes.
Our HSS-M2 LH Dies are specifically engineered with reverse-helix geometry to produce flawless left-hand threads that resist vibration-induced loosening. Every die is 100% CNC-ground and features a specialized 3.5-thread lead-in chamfer optimized for counter-clockwise rotation. Constructed from vacuum-hardened High-Speed Steel (HRC 63-65), these tools provide the toughness required to thread through tough alloys used in rotating spindles.
| Size (LH) | Pitch (mm) | Outer Diameter (mm) | Thickness (mm) | Recommended Rod Ø |
| M3 LH | 0.50 | 20 mm | 5 mm | 2.88 mm |
| M4 LH | 0.70 | 20 mm | 5 mm | 3.85 mm |
| M5 LH | 0.80 | 20 mm | 7 mm | 4.85 mm |
| M6 LH | 1.00 | 20 mm | 7 mm | 5.82 mm |
| M8 LH | 1.25 | 25 mm | 9 mm | 7.78 mm |
| M10 LH | 1.50 | 30 mm | 11 mm | 9.76 mm |
| M12 LH | 1.75 | 38 mm | 14 mm | 11.72 mm |
| M16 LH | 2.00 | 45 mm | 18 mm | 15.68 mm |
| M20 LH | 2.50 | 45 mm | 18 mm | 19.62 mm |
| M24 LH | 3.00 | 55 mm | 22 mm | 23.55 mm |
| Size (LH) | TPI (UNC/UNF) | Outer Diameter (O.D.) | Thickness (H) | Best For... |
| 1/4" LH | 20 / 28 | 1" (25.4mm) | 9 mm | Bicycle/Small Parts |
| 5/16" LH | 18 / 24 | 1" (25.4mm) | 9 mm | Automotive Links |
| 3/8" LH | 16 / 24 | 1.5" (38.1mm) | 14 mm | Precision Spindles |
| 1/2" LH | 13 / 20 | 1.5" (38.1mm) | 14 mm | Industrial Shafts |
| 5/8" LH | 11 / 18 | 1.5" (38.1mm) | 14 mm | Heavy Machinery |
| 3/4" LH | 10 / 16 | 2" (50.8mm) | 16 mm | Marine Propellers |
| 1" LH | 8 / 12 | 2" (50.8mm) | 16 mm | Large Drive Shafts |
Rotating Machinery: Essential for manufacturing spindles, fans, and flywheels where clockwise rotation would loosen a standard thread.
Automotive Repair: Used for specialized suspension components, steering linkages, and bicycle left-side crank arms.
Gas Cylinder Valves: The industry standard for flammable gas connectors (like Acetylene) to prevent accidental connection to oxygen lines.
Industrial MRO: Crucial for restoring threads on specialized industrial shafts that utilize reverse-locking nut systems.
Clear Identification: Always look for the "LH" marking. Rotating an LH die in a clockwise direction will instantly ruin the cutting teeth.
Directional Start: Our LH dies feature a precision-ground lead-in chamfer on the side with the etched size; ensure this side faces the workpiece first.
Counter-Clockwise Rotation: To cut, rotate the die stock counter-clockwise. Remember: "Lefty-Tightly" for LH threads.
Lubrication: Use high-viscosity cutting oil to ensure a smooth, controlled cut during the reverse rotation process.
Q: Can I use a standard die stock with an LH die?
A: Yes. The outer diameters (20mm, 25mm, 38mm, etc.) are standard. You simply rotate the handle in the opposite direction.
Q: Do you offer LH dies in fine pitch (Metric Fine)?
A: Yes. We stock a full range of LH fine pitch dies (e.g., M10x1.0 LH, M12x1.25 LH) commonly used in automotive applications.
Q: Why choose HSS-M2 over Carbon Steel for LH threads?
A: LH threads are often used in high-stress parts made of tougher alloys. HSS-M2 provides the necessary "Red Hardness" to cut through these materials without dulling.
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