Head Depths Reference Chart

A.S.M.E., Standard, Shallow, Flanged & Dished

OD	A.S.M.E. F & D		STANDARD F & D		SHALLOW F & D		MAX. SF	CIRCUMFERENCES
	IDD	KR	IDD	KR	IDD	KR
24	4 5/16	2	4 5/16	2	3 7/16	2	1/2	6′ – 3 13/32″
26	4 5/8	2	4 5/8	2	3 5/8	2	1	6′ – 9 11/16″
28	4 7/8	2	4 7/8	2	3 13/16	2	1	7′ – 3 31/32″
30	5 1/8	2	5 1/8	2	3 15/16	2	1	7′ – 10 1/4″
32	5 3/8	2	5 3/8	2	4 1/8	2	1	8′ – 4 17/32″
34	6 1/4	3	5 11/16	2	4 5/16	2	1	8′ – 10 13/16″
36	6 9/16	3	5 15/16	2	4 1/2	2	1	9′ – 5 3/32″
38	6 13/16	3	6 3/16	2	4 5/8	2	1 1/2	9′ – 11 3/8″
40	7 1/16	3	6 7/16	2	4 13/16	2	1 1/2	10′ – 5 21/32″
42	7 5/16	3	6 3/4	2	5	2	1 1/2	10′ – 11 15/16″
44	7 5/8	3	7	2	5 3/16	2	1 1/2	11′ – 6 7/32″
46	7 7/8	3	7 1/4	2	5 5/16	2	1 1/2	12′ – 1/2″
48	8 1/8	3	7 1/2	2	5 1/2	2	1 1/2	12′ – 6 25/32″
50	8 3/8	3	7 13/16	2	5 11/16	2	1 1/2	13′ – 1 3/32″
52	9 1/4	4	8 1/16	2	5 7/8	2	1 1/2	13′ – 7 3/8″
54	9 1/2	4	8 5/16	2	6	2	1 1/2	14′ – 1 21/32″
56	9 13/16	4	8 5/8	2	6 3/16	2	1 1/2	14′ – 7 15/16″
58	10 1/16	4	8 7/8	2	6 3/8	2	1 1/2	15′ – 2 7/32″
60	10 5/16	4	9 1/8	2	6 1/2	2	1 1/2	15′ – 8 1/2″
62	10 5/8	4	9 3/8	2	6 11/16	2	1 1/2	16′ – 2 25/32″
64	10 7/8	4	9 11/16	2	6 7/8	2	1 1/2	16′ – 9 1/16″
66	11 1/8	4	9 15/16	2	7 1/16	2	1 1/2	17′ – 3 11/32″
68	12	5	10 3/16	2	7 3/16	2	1 1/2	17′ – 9 5/8″
70	12 1/4	5	10 7/16	2	7 3/8	2	1 1/2	18′ – 3 29/32″
72	12 1/2	5	10 3/4	2	7 /16	2	1 1/2	18′ – 10 3/16″
74	12 13/16	5	11	2	7 3/4	2	1/2	19′ – 4 15/32″
76	13 1/16	5	11 1/4	2	7 7/8	2	1 1/2	19′ – 10 3/4″
78	13 5/16	5	11 9/16	2	8 1/16	2	1 1/2	20′ – 5 1/32″
80	13 5/8	5	11 13/16	2	8 1/4	2	1 1/2	20′ – 11 5/16″
82	13 7/8	5	12 1/16	2	8 7/16	2	1 1/2	21′ – 5 5/8″
84	14 3/4	6	12 5/16	2	8 9/16	2	1 1/2	21′ – 11 29/32″
86	15	6	12 5/8	2	8 3/4	2	1 1/2	22′ – 6 3/16″
88	15 1/4	6	12 7/8	2	8 15/16	2	1 1/2	23′ – 15/32″
90	15 1/2	6	13 1/8	2	9 1/8	2	1 1/2	23′ – 6 3/4″
92	15 13/16	6	13 7/16	2	9 1/4	2	1 1/2	24′ – 1 1/32″

*Note: OAH = IDD + SF + THK  (Actual measurements may vary)