inch External Size 尺寸 Thread Designation 螺 紋規格名稱 Class Max Min Max Min Max 0.0118 30-318 UNM 2A 0.0118 0.0112 0.0098 0.0092 0.0080 0.0138 35-282 UNM 2A 0.0138 0.0131 0.0115 0.0109 0.0095 0.0157 40-254 UNM 2A 0.0157 0.0150 0.0132 0.0126 0.0110 0.0177 45-254 UNM 2A 0.0177 0.0170 0.0152 0.0145 0.0130 0.0197 50-203 UNM 2A 0.0197 0.0189 0.0165 0.0158 0.0138 0.021 0000-160 NS 2A 0.021 0.0195 0.0169 0.01