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Notes

Inch & Metric Equivalents

Fractional in Decimal in Closest mm Δ in Δ mm
1/16   1.5 0.0034 0.087
  **0.1** **2.5** **0.0016** **0.040**
  0.2 5 0.0031 0.080
  0.3 7.5 0.0047 0.120
5/16   8 0.0025 0.063
**3/8**   **9.5** **0.0010** **0.025**
7/16   11 0.0044 0.112
5/8   16 0.0049 0.125
**11/16**   **17.5** **0.0015** **0.038**
**3/4**   **19** **0.0020** **0.050**
1 1 25.5 0.0039 0.100
**1 1/16**   **27** **0.0005** **0.013**
  1.1 28 0.0024 0.060
1 1/8   28.5 0.0030 0.075
  **1.2** **30.5** **0.0008** **0.020**
  **1.3** **33** **0.0008** **0.020**
1 3/8   35 0.0030 0.075
  1.4 35.5 0.0024 0.060
**1 7/16**   **36.5** **0.0005** **0.012**
1 1/2 1.5 38 0.0039 0.100
**1 3/4**   **44.5** **0.0020** **0.050**
**1 13/16**   **46** **0.0015** **0.037**
1 7/8   47.5 0.0049 0.125
2 1/16   52.5 0.0044 0.113
**2 1/8**   **54** **0.0010** **0.025**
2 3/16   55.5 0.0025 0.063
  2.2 56 0.0047 0.120
  2.3 58.5 0.0031 0.080
  **2.4** **61** **0.0016** **0.040**
2 7/16   62 0.0034 0.088
**2 1/2** **2.5** **63.5** **0.0000** **0.000**
2 9/16   65 0.0034 0.087
  **2.6** **66** **0.0016** **0.040**
  2.7 68.5 0.0031 0.080
  2.8 71 0.0047 0.120
2 13/16   71.5 0.0025 0.063
**2 7/8**   **73** **0.0010** **0.025**
2 15/16   74.5 0.0044 0.112
3 1/8   79.5 0.0049 0.125
**3 3/16**   **81** **0.0015** **0.038**
**3 1/4**   **82.5** **0.0020** **0.050**
3 1/2 3.5 89 0.0039 0.100
**3 9/16**   **90.5** **0.0005** **0.013**
  3.6 91.5 0.0024 0.060
3 5/8   92 0.0030 0.075
  **3.7** **94** **0.0008** **0.020**
  **3.8** **96.5** **0.0008** **0.020**
3 7/8   98.5 0.0030 0.075
  3.9 99 0.0024 0.060
**3 15/16**   **100** **0.0005** **0.012**
4 4 101.5 0.0039 0.100
**4 1/4**   **108** **0.0020** **0.050**
**4 5/16**   **109.5** **0.0015** **0.037**
4 3/8   111 0.0049 0.125
4 9/16   116 0.0044 0.113
**4 5/8**   **117.5** **0.0010** 0.025
4 11/16   119 0.0025 0.063
  4.7 119.5 0.0047 0.120
  4.8 122 0.0031 0.080
  **4.9** **124.5** **0.0016** **0.040**
4 15/16   125.5 0.0034 0.088
**5** **5** **127** **0.0000** **0.000**
5 1/16   128.5 0.0034 0.088
  **5.1** **129.5** **0.0016** **0.040**
  5.2 132 0.0031 0.080
  5.3 134.5 0.0047 0.120
5 5/16   135 0.0025 0.063
**5 3/8**   **136.5** **0.0010** **0.025**
5 7/16   138 0.0044 0.112
5 5/8   143 0.0049 0.125
**5 11/16**   **144.5** **0.0015** **0.037**
**5 3/4**   **146** **0.0020** **0.050**
6 6 152.5 0.0039 0.100
**6 1/16**   **154** **0.0005** **0.013**
  6.1 155 0.0024 0.060
6 1/8   155.5 0.0030 0.075
  **6.2** **157.5** **0.0008** **0.020**
  **6.3** **160** **0.0008** **0.020**
6 3/8   162 0.0030 0.075
  6.4 162.5 0.0024 0.060
**6 7/16**   **163.5** **0.0005** **0.012**
6 1/2 6.5 165 0.0039 0.100
**6 3/4**   **171.5** **0.0020** **0.050**
**6 13/16**   **173** **0.0015** **0.037**
6 7/8   174.5 0.0049 0.125
7 1/16   179.5 0.0044 0.113
**7 1/8**   **181** **0.0010** **0.025**
7 3/16   182.5 0.0025 0.063
  7.2 183 0.0047 0.120
  7.3 185.5 0.0031 0.080
  **7.4** **188** **0.0016** **0.040**
7 7/16   189 0.0034 0.088
**7 1/2** **7.5** **190.5** **0.0000** **0.000**
7 9/16   192 0.0034 0.087
  **7.6** **193** **0.0016** **0.040**
  7.7 195.5 0.0031 0.080
  7.8 198 0.0047 0.120
7 13/16   198.5 0.0025 0.063
**7 7/8**   **200** **0.0010** **0.025**
7 15/16   201.5 0.0044 0.112
8 1/8   206.5 0.0049 0.125
**8 3/16**   **208** **0.0015** **0.038**
**8 1/4**   **209.5** **0.0020** **0.050**
8 1/2 8.5 216 0.0039 0.100
**8 9/16**   **217.5** **0.0005** **0.013**
  8.6 218.5 0.0024 0.060
8 5/8   219 0.0030 0.075
  **8.7** **221** **0.0008** **0.020**
  **8.8** **223.5** **0.0008** **0.020**
8 7/8   225.5 0.0030 0.075
  8.9 226 0.0024 0.060
**8 15/16**   **227** **0.0005** **0.012**
9 9 228.5 0.0039 0.100
**9 1/4**   **235** **0.0020** **0.050**
**9 5/16**   **236.5** **0.0015** **0.037**
9 3/8   238 0.0049 0.125
9 9/16   243 0.0044 0.113
**9 5/8**   **244.5** **0.0010** **0.025**
9 1/16   246 0.0025 0.063
  9.7 246.5 0.0047 0.120
  9.8 249 0.0031 0.080
  **9.9** **251.5** **0.0016** **0.040**
9 15/16   252.5 0.0034 0.088
**10** **10** **254** **0.0000** **0.000**