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梅花型承穴的螺絲英文專利名稱為 Torx Drive

它的規範都是出自於CAMCAR, 不過也有別的公司把CAMCAR的規範套上自己的LOGO變成自己的規範 你所問的T4,T5, 承穴的尺寸差異只有0.127mm, 這要以肉眼判斷是T4或T5是很困難的, 另外, 它的頭型規格相當多. CAMCAR的TORX頭型規範LIST如下 :
TXH 2.0 1999Torx Recess Fallaway Specification
TXH 201 1986External Washer Head (Hex Washer Head Bearing Surface)
TXH 201.1 1999Round Washer Head
TXH 202 1999Pan Head
TXH 202B 1999Pan Head - Struck Slot
TXH 203 1999Flat Head
TXH 203A 1999Standard Trailer Floor Screw
TXH 203B 1999Flat Head - Tamper Resistant
TXH 204 1999Hex Head
TXH 205 1999Hex Washer Head
TXH 206 1999Truss Head
TXH 207 1999Fillister Head
TXH 208 1999Oval Head
TXH 210 1999High Strengyh Head for Structural Applications
TXH 301 1999100° Flat Head
TXH 401 1999Socket Head Cap Screw
TXH 401A 1999Low Head Socket Cap
TXH 402 1999Socket Flat Head
TXH 403 1999Socket Butter Head
TXH 403A 1999Socket Button Head - Tamper Resistant
TXH 403B 1999High Socket Button Head Cap Screw (Torxalign Compatible)
TXH 404 1999Shoulder Screw Head
TXH 405 1993Socket Set Screw