The Torx drive system was invented in 1967 by Camcar Textron. The original shorthand used by the inventors to designate sizes was simply the letter "T" followed by a number (e.g., T10, T15, T20, T25). The number correlates loosely to the dimension of the screw head, with larger numbers indicating larger drives. Because Camcar held the original patents, the "T" nomenclature became the globally recognized baseline standard. 2. The "TX" Branding and Regional Standards
Verdict: When we say "TX20" in common parlance, we mean . difference between t20 and tx20
The is a member of the standard Torx fastener family, officially designated as ISO 10664 . Invented by Camcar Textron in 1967, the Torx drive was revolutionary because it replaced the hex (Allen) head. Unlike hex heads, which experience "cam-out" (the bit slipping out under high torque), the straight vertical walls of the Torx design allowed for higher torque transfer. The Torx drive system was invented in 1967 by Camcar Textron