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 ASME B16.20 - API 6A

For Flanges:
API 6B

ASME-ANSI ISO 2000# 3000# 5000#
1/2" 15      
3/4" 20      
1" 25 R 16 R 16 R 16
1 1/4" 32 R 18 R 18 R 18
1 1/2" 40 R 20 R 20 R 20
2" 50 R 23 R 24 R 24
2 1/2" 65 R 26 R 27 R 27
3" 80 R 31 R 31 R 35
3 1/2" 90     R 37
4" 100 R 37 R 37 R 39
5" 125 R 41 R 41 R 44
6" 150 R 45 R 45 R 46
8" 200 R 49 R 49 R 50
10" 250 R 53 R 53 R 54
12" 300 R 57 R 57  
14" 350 R 61 R 61  
16" 400 R 65 R 66  
18" 450 R 69 R 70  
20" 500 R 73 R 74  

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RTJ tabel type R

Find "R" no or dimension here.

ASME B16.20 - API 6A

For Flanges:
ASME/ANSI B16.5 - ISO/DIS7005 - ASME B16.47 Series A (MSS SP44)

ASME-ANSI ISO 150# 3/600# 900# 1500# 2500#
     PN20 PN50/100 PN150 PN250 PN420
1/2" 15   R 11 R 12 R 12 R 13
3/4" 20   R 13 R 14 R 14 R 16
1" 25 R 15 R 16 R 16 R 16 R 18
1 1/4" 32 R 17 R 18 R 18 R 18 R 21
1 1/2" 40 R 19 R 20 R 20 R 20 R 23
2" 50 R 22 R 23 R 24 R 24 R 26
2 1/2" 65 R 25 R 26 R 27 R 27 R 28
3" 80 R 29 R 31 R 31 R 35 R 32
3 1/2" 90 R 33 R 34      
4" 100 R 36 R 37 R 37 R 39 R 38
5" 125 R 40 R 41 R 41 R 44 R 42
6" 150 R 43 R 45 R 45 R 46 R 47
8" 200 R 48 R 49 R 49 R 50 R 51
10" 250 R 52 R 53 R 53 R 54 R 55
12" 300 R 56 R 57 R 57 R 58 R 60
14" 350 R 59 R 61 R 62 R 63  
16" 400 R 64 R 65 R 66 R 67  
18" 450 R 68 R 69 R 70 R 71  
20" 500 R 72 R 73 R 74 R 75  
22" 550 R 80 R 81      
24" 600 R 76 R 77 R 78 R 79  
26" 650   R 93 R 100    
28" 700   R 94 R 101    
32" 800   R 96 R 103    
30" 750   R 95 R 102    
34" 850   R 97 R 104    
36" 900   R 98 R 105