| Specification | T20 (Torx) | TX20 (Torx Plus) | | :--- | :--- | :--- | | Standard | ISO 10664 | ISO 10664 (Annex A) | | Lobe Profile | Circular arc | Square drive segment | | Contact Angle | 30 degrees | 0 degrees (flat) | | Screw Head Strength | Moderate (risk of cracking) | Very High | | Tool Wear | High (tips break) | Low (flat surfaces) | | Cam-out risk | Low (but exists if worn) | Zero | | Back-out ability | Good | Excellent (can remove rusted bolts) | | Industry | General assembly | Aerospace, Automotive safety |
The TX20 is a member of the Torx Plus family, an improved version introduced later. The "TX" stands for Torx Plus. Do not mistake this for a brand name; it is a distinct mechanical standard.
This depends entirely on your trade.
This is the most dangerous part of the "T20 vs TX20" debate. Because the size number (20) is identical, many DIYers assume they are interchangeable. They are not, but they do fit poorly. difference between t20 and tx20
If you go to the hardware store, you need to know that a standard "Torx Bit Set" will contain T1 through T60. A "Torx Plus Bit Set" will be clearly labeled as TX or Torx Plus.
Do not rely on color coding. Many cheap Chinese sets paint bits black or gold regardless of type.
What to look for on the packaging:
Recommended buying strategy: Buy a combo rail. Brands like Wiha, Wera, or Tekton sell "Torx & Torx Plus" combo sets because manufacturers know users confuse them.
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