UNC-2B
1
7/22/2019 UNC-2B http://slidepdf.com/reader/full/unc-2b 1/1 3.04.2 2008/1 ISO INCH THREAD WITH A STANDARD UNC-2B TOLERANCE Ref. ASME B1.1 1989 Unified Inch Screw Threads Relationship between the tolerances mm to ins . / 25,4 ins. to mm x 25,4 Tolerance class 2A is the foundation 1A = 1,500 x 2A 2A = 1,000 3A = 0,750 x 2A 1B = 1,950 x 2A 2B = 1,300 x 2A 3B = 0,975 x 2A Example : On a ½-13 U NC-2A screw the pitch diameter tolerance is 0,127 mm Allowance from the nominal pitch diameter for 2A and 1A is 0,127 x 0,3 = 0,038 i.e. 0.3 x 2A pitch diameter tolerance 1A is 0,127 x 1,5= 0,1905 1B is 0,127 x 1,950 = 0,248 2B is 0,127 x 1,300 = 0,165 3A is 0,127 x 0,75= 0,095 3B is 0,127 x 0,975 = 0,124 Denomination or D mm (nom.) D 2 nom D 2 min D 2 max 3-48 UNC 4-40 UNC 5-40 UNC 6-32 UNC 8-32 UNC 10-24 UNC 12-24 UNC ¼-20 UNC 5 / 16 -18 UNC 3 / 8 -16 UNC 7 / 16 -14 UNC ½-13 UNC 9 / 16 -12 UNC 5 / 8 -11 UNC ¾-10 UNC 7 / 8 -9 UNC 1-8 UNC 1 1 / 8 -7 UNC 1 1 / 4 -7 UNC 1 3 /8-6 UNC 1 1 / 2 -6 UNC 1 3 / 4 -5 UNC 2-4 1 / 2 UNC 2 1 / 4 -4 1 / 2 UNC 2 1 / 2 -4 UNC 2 3 / 4 -4 UNC 3 -4 UNC 3 1 / 4 -4 UNC 3 1 / 2 -4 UNC 3 3 / 4 -4 UNC 4-4 UNC 0,099-48 UNC 0,112-40 UNC 0,125-40 UNC 0,138-32 UNC 0,164-32 UNC 0,190-24 UNC 0,216-24 UNC 0,250-20 UNC 0,3125-18 UNC 0,375-16 UNC 0,4375-14 UNC 0,500-13 UNC 0,5625-12 UNC 0,625-11 UNC 0,750-10 UNC 0,875-9 UNC 1,000-8 UNC 1,125-7 UNC 1,250-7 UNC 1,375-6 UNC 1,500-6 UNC 1,750-5 UNC 2,000-4 1 / 2 UNC 2,250-4 1 / 2 UNC 2,500-4 UNC 2,750-4 UNC 3,000-4 UNC 3,250-4 UNC 3,500-4 UNC 3,750-4 UNC 4,000-4 UNC 2,515 2,845 3,175 3,505 4,166 4,826 5,486 6,350 7,937 9,525 11,112 12,700 14,288 15,875 19,050 22,225 25,400 28,575 31,750 34,925 38,100 44,450 50,800 57,150 63,500 69,850 76,200 82,550 88,900 92,250 101,600 2,172 2,433 2,764 2,990 3,650 4,138 4,798 5,525 7,021 8,494 9,934 11,430 12,913 14,376 17,399 20,391 23,338 26,218 29,393 32,174 35,349 41,151 47,135 53,485 59,375 65,725 74,615 78,425 87,775 91,125 97,475 2,172 2,433 2,764 2,990 3,650 4,138 4,798 5,525 7,021 8,494 9,934 11,430 12,913 14,376 17,399 20,391 23,338 26,218 29,393 32,174 35,349 41,151 47,135 53,485 59,375 65,725 74,615 78,425 87,775 91,125 97,475 2,248 2,517 2,847 3,084 3,746 4,247 4,910 5,649 7,155 8,639 10,089 11,595 13,086 14,559 17,595 20,599 23,561 26,457 29,637 32,438 35,616 41,445 47,450 53,805 59,718 66,073 72,428 78,783 85,138 91,493 97,848 WWW.F-M-S.DK
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Transcript of UNC-2B
7/22/2019 UNC-2B
http://slidepdf.com/reader/full/unc-2b 1/1
3.04.2 2008/1
ISO INCH THREAD WITH A STANDARD UNC-2B TOLERANCERef. ASME B1.1 1989 Unified Inch Screw Threads
Relationship between the tolerances
mm to ins . / 25,4
ins. to mm x 25,4 Tolerance class 2A is the foundation
1A = 1,500 x 2A2A = 1,0003A = 0,750 x 2A
1B = 1,950 x 2A2B = 1,300 x 2A3B = 0,975 x 2A
Example :
On a ½-13 UNC-2A screw the pitch diameter tolerance is 0,127 mm
Allowance from the nominal pitch diameter for 2A and 1Ais 0,127 x 0,3 = 0,038 i.e. 0.3 x 2A pitch diameter tolerance
1A is 0,127 x 1,5= 0,1905 1B is 0,127 x 1,950 = 0,248
2B is 0,127 x 1,300 = 0,165
3A is 0,127 x 0,75= 0,095 3B is 0,127 x 0,975 = 0,124
Denomination or D mm (nom.) D2 nom D2 min D2 max 3-48 UNC4-40 UNC5-40 UNC6-32 UNC
8-32 UNC
10-24 UNC
12-24 UNC
¼-20 UNC5/16-18 UNC
3/8-16 UNC
7/16-14 UNC
½-13 UNC9/16-12 UNC
5/8-11 UNC
¾-10 UNC7/8-9 UNC
1-8 UNC1
1/8-7 UNC
11/4-7 UNC
13/8-6 UNC1
1/2-6 UNC
13/4-5 UNC
2-41/2 UNC
21/4 -4
1/2 UNC
21/2 -4 UNC
23/4 -4 UNC
3 -4 UNC3
1/4 -4 UNC
31/2 -4 UNC
33/4 -4 UNC
4-4 UNC
0,099-48 UNC0,112-40 UNC0,125-40 UNC0,138-32 UNC
0,164-32 UNC
0,190-24 UNC
0,216-24 UNC
0,250-20 UNC0,3125-18 UNC
0,375-16 UNC
0,4375-14 UNC
0,500-13 UNC0,5625-12 UNC
0,625-11 UNC0,750-10 UNC0,875-9 UNC
1,000-8 UNC1,125-7 UNC1,250-7 UNC
1,375-6 UNC1,500-6 UNC
1,750-5 UNC
2,000-41/2 UNC
2,250-41/2 UNC
2,500-4 UNC2,750-4 UNC
3,000-4 UNC3,250-4 UNC3,500-4 UNC
3,750-4 UNC
4,000-4 UNC
2,5152,8453,1753,505
4,166
4,826
5,486
6,3507,937
9,525
11,112
12,70014,288
15,87519,05022,225
25,40028,57531,750
34,92538,100
44,450
50,80057,150
63,50069,850
76,20082,55088,900
92,250
101,600
2,1722,4332,7642,990
3,650
4,138
4,798
5,5257,021
8,494
9,934
11,43012,913
14,37617,39920,391
23,33826,21829,393
32,17435,349
41,151
47,13553,485
59,37565,725
74,61578,42587,775
91,125
97,475
2,1722,4332,7642,990
3,650
4,138
4,798
5,5257,021
8,494
9,934
11,43012,913
14,37617,39920,391
23,33826,21829,393
32,17435,349
41,151
47,13553,485
59,37565,725
74,61578,42587,775
91,125
97,475
2,2482,5172,8473,084
3,746
4,247
4,910
5,6497,155
8,639
10,089
11,59513,086
14,55917,59520,599
23,56126,45729,637
32,43835,616
41,445
47,45053,805
59,71866,073
72,42878,78385,138
91,493
97,848
WWW.F-M-S.DK
