TIÊU CHUẨN NHÀ NƯỚC
TCVN 381 - 70
BẢNG TÍNH CHUYỂN INSƠ - MILIMÉT
TỪ 0,001 INSƠ ĐẾN 1 INSƠ
Tiêu chuẩn này áp dụng cho việc tính toán các kích thước độ dài khi cần tính chuyển các trị số từ đơn vị insơ sang đơn vị milimét trong phạm vi từ 0,001” đến 1” theo đẳng thức:
1” = 25,400 000 mm
Các trị số nêu trong bảng tính chuyển của tiêu chuẩn này được tính ở nhiệt độ 20oC.
Chú thích: Trong trường hợp cần tính thật chính xác thì không dùng bảng này mà tính theo tỷ lệ sau:
- Đối với hệ insơ Anh:
1” Anh = 25,399 956 mm
- Đối với hệ insơ Mỹ:
1” Mỹ = 25,400 051 mm
Insơ
Insơ
0,000
0,001
0,002
0,003
0,004
0,005
0,006
0,007
0,008
0,009
Milimet
0
0
0,0254
0,0508
0,0762
0,1016
0,1270
0,1524
0,1778
0,2032
0,2286
0,01
0,2540
0,2794
0,3048
0,3302
0,3556
0,3810
0,4064
0,4318
0,4572
0,4826
0,02
0,5080
0,5334
0,5588
0,5842
0,6096
0,6350
0,6604
0,6858
0,7112
0,7366
0,03
0,7620
0,7874
0,8128
0,8382
0,8636
0,8890
0,9144
0,9398
0,9652
0,9906
0,04
1,0160
1,0414
1,0668
1,0922
1,1176
1,1430
1,1684
1,1938
1,2192
1,2446
0,05
1,2700
1,2954
1,3208
1,3462
1,3716
1,3970
1,4224
1,4478
1,4732
1,4986
0,06
1,5240
1,5494
1,5748
1,6002
1,6256
1,6510
1,6764
1,7018
1,7272
1,7526
0,07
1,7780
1,8034
1,8288
1,8542
1,8796
1,9050
1,9304
1,9558
1,9812
2,0066
0,08
2,0320
2,0574
2,0828
2,1082
2,1336
2,1590
2,1844
2,2098
2,2352
2,2606
0,09
2,2860
2,3114
2,3368
2,3622
2,3876
2,4130
2,4384
2,4638
2,4892
2,5146
0,10
2,5400
2,5654
2,5908
2,6162
2,6416
2,6670
2,6924
2,7178
2,7432
2,7686
0,11
2,7940
2,8194
2,8448
2,8702
2,8956
2,9210
2,9464
2,9718
2,9972
3,0226
0,12
3,0480
3,0734
3,0988
3,1242
3,1496
3,1750
3,2004
3,2258
3,2512
3,2766
0,13
3,3020
3,3274
3,3528
3,3782
3,4036
3,4290
3,4544
3,4798
3,5052
3,5306
0,14
3,5560
3,5814
3,6068
3,6322
3,6576
3,6830
3,7084
3,7338
3,7592
3,7846
0,15
3,8100
3,8354
3,8608
3,8862
3,9116
3,9370
3,9624
3,9878
4,0132
4,0386
0,16
4,0640
4,0894
4,1148
4,1402
4,1656
4,1910
4,2164
4,2418
4,2672
4,2926
0,17
4,3180
4,3434
4,3688
4,3942
4,4196
4,4450
4,4704
4,4958
4,5212
4,5466
0,18
4,5720
4,5974
4,6228
4,6482
4,6736
4,6990
4,7244
4,7498
4,7752
4,8006
0,19
4,8260
4,8514
4,8768
4,9022
4,9276
4,9530
4,9784
5,0038
5,0292
5,0546
0,20
5,0800
5,1054
5,1308
5,1562
5,1816
5,2070
5,2324
5,2578
5,2832
5,3086
0,21
5,3340
5,3594
5,3848
5,4102
5,4356
5,4610
5,4864
5,5118
5,5372
5,5626
0,22
5,5880
5,6134
5,6388
5,6642
5,6896
5,7150
5,7404
5,7658
5,7912
5,8166
0,23
5,8420
5,8674
5,8928
5,9182
5,9436
5,9690
5,9944
6,0198
6,0452
6,0706
0,24
6,0960
6,1214
6,1468
6,1722
6,1976
6,2230
6,2484
6,2738
6,2992
6,3246
0,25
6,3500
6,3754
6,4008
6,4262
6,4516
6,4770
6,5024
6,5278
6,5532
6,5786
0,26
6,6040
6,6294
6,6548
6,6802
6,7056
6,7310
6,7564
6,7818
6,8072
6,8326
0,27
6,8580
6,8834
6,9088
6,9342
6,9596
6,9850
7,0104
7,0358
7,0612
7,0866
0,28
7,1120
7,1374
7,1628
7,1882
7,2136
7,2390
7,2644
7,2898
7,3152
7,3406
0,29
7,3660
7,3914
7,4168
7,4422
7,4676
7,4930
7,5184
7,5438
7,5692
7,5946
0,30
7,6200
7,6454
7,6708
7,6962
7,7216
7,7470
7,7724
7,7978
7,8232
7,8486
0,31
7,8740
7,8994
7,9248
7,9502
7,9756
8,0010
8,0264
8,0518
8,0772
8,1026
0,32
8,1280
8,1534
8,1788
8,2042
8,2296
8,2550
8,2804
8,3058
8,3312
8,3566
0,33
8,3820
8,4074
8,4328
8,4582
8,4836
8,5090
8,5344
8,5598
8,5852
8,6106
0,34
8,6360
8,6614
8,6868
8,7122
8,7376
8,7630
8,7884
8,8138
8,8392
8,8646
0,35
8,8900
8,9154
8,9408
8,9662
8,9916
9,0170
9,0424
9,0678
9,0932
9,1186
0,36
9,1440
9,1694
9,1948
9,2202
9,2456
9,2710
9,2964
9,3218
9,3472
9,3726
0,37
9,3980
9,4234
9,4488
9,4742
9,4996
9,5250
9,5504
9,5758
9,6012
9,6266
0,38
9,6520
9,6774
9,7028
9,7282
9,7536
9,7790
9,8044
9,8298
9,8552
9,8806
0,39
9,9060
9,9314
9,9568
9,9822
10,0076
10,0330
10,0584
10,0838
10,1092
10,1346
0,40
10,1600
10,1854
10,2108
10,2362
10,2616
10,2870
10,3124
10,3378
10,3632
10,3886
0,41
10,4140
10,4394
10,4648
10,4902
10,5156
10,5410
10,5664
10,5918
10,6172
10,6426
0,42
10,6680
10,6934
10,7188
10,7442
10,7696
10,7950
10,8204
10,8458
10,8712
10,8966
0,43
10,9220
10,9474
10,9728
10,9982
11,0236
11,0490
11,0744
11,0998
11,1252
11,1506
0,44
11,1760
11,2014
11,2268
11,2522
11,2776
11,3030
11,3284
11,3538
11,3792
11,4046
0,45
11,4300
11,4554
11,4808
11,5062
11,5316
11,5570
11,5824
11,6078
11,6332
11,6586
0,46
11,6840
11,7094
11,7348
11,7602
11,7856
11,8110
11,8364
11,8618
11,8872
11,9126
0,47
11,9380
11,9634
11,9888
12,0142
12,0396
12,0650
12,0904
12,1158
12,1412
12,1666
0,48
12,1920
12,2174
12,2428
12,2682
12,2936
12,3190
12,3444
12,3698
12,3952
12,4206
0,49
12,4460
12,4714
12,4968
12,5222
12,5476
12,5730
12,5984
12,6238
12,6492
12,6746
0,50
12,7000
12,7254
12,7508
12,7762
12,8016
12,8270
12,8524
12,8778
12,9032
12,9286
0,51
12,9540
12,9794
13,0048
13,0302
13,0556
13,0810
13,1064
13,1318
13,1572
13,1826
0,52
13,2080
13,2334
13,2588
13,2842
13,3096
13,3350
13,3604
13,3858
13,4112
13,4366
0,53
13,4620
13,4874
13,5128
13,5382
13,5636
13,5890
13,6144
13,6398
13,6652
13,6906
0,54
13,7160
13,7414
13,7668
13,7922
13,8176
13,8430
13,8684
13,8938
13,9192
13,9446
0,55
13,9700
13,9954
14,0208
14,0462
14,0716
14,0970
14,1224
14,1478
14,1732
14,1986
0,56
14,2240
14,2494
14,2748
14,3002
14,3256
14,3510
14,3764
14,4018
14,4272
14,4526
0,57
14,4780
14,5034
14,5288
14,5542
14,5796
14,6050
14,6304
14,6558
14,6812
14,7066
0,58
14,7320
14,7574
14,7828
14,8082
14,8336
14,8590
14,8844
14,9098
14,9352
14,9606
0,59
14,9860
15,0114
15,0368
15,0622
15,0876
15,1130
15,1384
15,1638
15,1892
15,2146
0,60
15,2400
15,2654
15,2908
15,3162
15,3416
15,3670
15,3924
15,4178
15,4432
15,4686
0,61
15,4940
15,5194
15,5448
15,5702
15,5956
15,6210
15,6464
15,6718
15,6972
15,7226
0,62
15,7480
15,7734
15,7988
15,8242
15,8496
15,8750
15,9004
15,9258
15,9512
15,9766
0,63
16,0020
16,0274
16,0528
16,0782
16,1036
16,1290
16,1544
16,1798
16,2052
16,2306
0,64
16,2560
16,2814
16,3068
16,3322
16,3576
16,3830
16,4084
16,4338
16,4592
16,4846
0,65
16,5100
16,5354
16,5608
16,5862
16,6116
16,6370
16,6624
16,6878
16,7132
16,7386
0,66
16,7640
16,7894
16,8148
16,8402
16,8656
16,8910
16,9164
16,9418
16,9672
16,9926
0,67
17,0180
17,0434
17,0688
17,0942
17,1196
17,1450
17,1704
17,1958
17,2212
17,2466
0,68
17,2720
17,2974
17,3228
17,3482
17,3736
17,3990
17,4244
17,4498
17,4752
17,5006
0,69
17,5260
17,5514
17,5768
17,6022
17,6276
17,6530
17,6784
17,7038
17,7292
17,7546
0,70
17,7800
17,8054
17,8308
17,8562
17,8816
17,9070
17,9324
17,9578
17,9832
18,0086
0,71
18,0340
18,0594
18,0848
18,1102
18,1356
18,1610
18,1864
18,2118
18,2372
18,2626
0,72
18,2880
18,3134
18,3388
18,3642
18,3896
18,4150
18,4404
18,4658
18,4912
18,5166
0,73
18,5420
18,5674
18,5928
18,6182
18,6436
18,6690
18,6944
18,7198
18,7452
18,7706
0,74
18,7960
18,8214
18,8468
18,8722
18,8976
18,9230
18,9484
18,9738
18,9992
19,0246
0,75
19,0500
19,0754
19,1008
19,1262
19,1516
19,1770
19,2024
19,2278
19,2532
19,2786
0,76
19,3040
19,3294
19,3548
19,3802
19,4056
19,4310
19,4564
19,4818
19,5072
19,5326
0,77
19,5580
19,5834
19,6088
19,6342
19,6596
19,6850
19,7104
19,7358
19,7612
19,7866
0,78
19,8120
19,8374
19,8628
19,8882
19,9136
19,9390
19,9644
19,9898
20,0152
20,0406
0,79
20,0660
20,0914
20,1168
20,1422
20,1676
20,1930
20,2184
20,2438
20,2692
20,2946
0,80
20,3200
20,3454
20,3708
20,3962
20,4216
20,4470
20,4724
20,4978
20,5232
20,5486
0,81
20,5740
20,5994
20,6248
20,6502
20,6756
20,7010
20,7264
20,7518
20,7772
20,8026
0,82
20,8280
20,8534
20,8788
20,9042
20,9296
20,9550
20,9804
21,0058
21,0312
21,0566
0,83
21,0820
21,1074
21,1328
21,1582
21,1836
21,2090
21,2344
21,2598
21,2852
21,3106
0,84
21,3360
21,3614
21,3868
21,4122
21,4376
21,4630
21,4884
21,5138
21,5392
21,5646
0,85
21,5900
21,6154
21,6408
21,6662
21,6916
21,7170
21,7424
21,7678
21,7932
21,8186
0,86
21,8440
21,8694
21,8948
21,9202
21,9456
21,9710
21,9964
22,0218
22,0472
22,0726
0,87
22,0980
22,1234
22,1488
22,1742
22,1996
22,2250
22,2504
22,2758
22,3012
22,3266
0,88
22,3520
22,3774
22,4028
22,4282
22,4536
22,4790
22,5044
22,5298
22,5552
22,5806
0,89
22,6060
22,6314
22,6568
22,6822
22,7076
22,7330
22,7584
22,7838
22,8092
22,8346
0,90
22,8600
22,8854
22,9108
22,9362
22,9616
22,9870
23,0124
23,0378
23,0632
23,0886
0,91
23,1140
23,1394
23,1648
23,1902
23,2156
23,2410
23,2664
23,2918
23,3172
23,3426
0,92
23,3680
23,3934
23,4188
23,4442
23,4696
23,4950
23,5204
23,5458
23,5712
23,5966
0,93
23,6220
23,6474
23,6728
23,6982
23,7236
23,7490
23,7744
23,7998
23,8252
23,8506
0,94
23,8760
23,9014
23,9268
23,9522
23,9776
24,0030
24,0284
24,0538
24,0792
24,1046
0,95
24,1300
24,1554
24,1808
24,2062
24,2316
24,2570
24,2824
24,3078
24,3332
24,3586
0,96
24,3840
24,4094
24,4348
24,4602
24,4856
24,5110
24,5364
24,5618
24,5872
24,6126
0,97
24,6380
24,6634
24,6888
24,7142
24,7396
24,7650
24,7904
24,8158
24,8412
24,8666
0,98
24,8920
24,9174
24,9428
24,9682
24,9936
25,0190
25,0444
25,0698
25,0952
25,1206
0,99
25,1460
25,1714
25,1968
25,2222
25,2476
25,2730
25,2984
25,3238
25,3492
25,3746
1” = 25,4000
(Tiếp theo)
Insơ
Milimet
Insơ
Milimet
Insơ
Milimet
Insơ
Milimet
1/64
0,015625
0,3969
17/64
0,109375
2,7781
33/64
0,515625
13,0969
49/64
0,765625
19,4469
1/32
0,03125
0,7938
9/32
0,28125
7,1438
17/32
0,53125
13,4938
25/32
0,78125
19,8438
3/64
0,046875
1,1906
19/64
0,296875
7,5406
35/64
0,546875
13,8906
51/64
0,796875
20,2406
1/16
0,0625
1,5875
5/16
0,3125
7,9375
9/16
0,5625
14,2875
13/16
0,8125
20,6375
5/64
0,078125
1,9844
21/64
0,328125
8,3344
37/64
0,578125
14,6844
53/64
0,828125
21,0344
3/32
0,09375
2,3813
11/32
0,34375
8,7313
19/32
0,59375
15,0813
27/32
0,84375
21,4313
7/64
0,109375
2,7781
26/34
0,359375
9,1281
39/64
0,609375
15,4781
55/64
0,859375
21,8281
1/8
0,125
3,1750
3/8
0,375
9,5250
5/8
0,625
15,8750
7/8
0,875
22,2250
9/64
0,140625
3,5719
25/64
0,390625
9,9219
41/64
0,640625
16,2719
57/64
0,890625
22,6219
5/32
0,15625
3,9688
13/32
0,40625
10,3188
21/32
0,65625
16,6688
29/32
0,90625
23,0188
11/64
0,171875
4,3656
27/64
0,421875
10,7156
43/64
0,671875
17,0656
59/64
0,921875
23,4156
3/16
0,1875
4,7625
7/16
0,4375
11,1125
11/16
0,6875
17,4625
15/16
0,9375
23,8125
13/64
0,203125
5,1594
29/64
0,453125
11,5094
45/64
0,703125
17,8594
61/64
0,953125
24,2094
7/32
0,21875
5,5563
15/32
0,46875
11,9063
23/32
0,71875
18,2563
31/32
0,96875
24,6063
15/64
0,234375
5,9531
31/64
0,484375
12,3031
47/64
0,734375
18,6531
63/64
0,984375
25,0031
1/4
0,25
6,3500
1/2
0,5
12,7000
3/4
0,75
19,0500
1”
25,4000