ANSI and SAE Mounting Flanges
2 bolt flanges
ANSI Flange	SAE No.	SAE HP Rating	MTG Bolt Circle	MTG Hole Diam	Pilot Diam inch
50-2	na	na	3.250	.406	2.000
82-2	A	10	4.188	.438	3.250
101-2	B	25	5.750	.562	4.000
127-2	C	50	7.125	.688	5.000
152-2	D	100	9.000	.812	6.000
165-2	E	200	12.500	1.062	6.500
177-2	F	300	13.781	1.062	7.000
4 Bolt Flanges
ANSI Flange	SAE No.	SAE HP Rating	MTG Bolt Circle	MTG Hole Diam	Pilot Diam inch
101-4	B	25	5.000	.562	4.000
127-4	C	50	6.375	.562	5.000
152-4	D	100	9.000	.812	6.000
165-4	E	200	12.500	.812	6.500
177-4	F	300	13.78	1.063	7.000
Straight Shafts With Threads
Shaft Code	Shaft Diam	Str Shaft Length	Thread Size	Thread Length	Key Width
13-2	.500	.750	3/8-24	.562	.125
16-2	.625	.938	1/2-20	.719	.156
22-2	.875	1.312	5/8-18	.906	.250
25-2	1.000	1.500	3/4-16	1.062	.250
32-2	1.250	1.875	1"-12	1.219	.312
38-2	1.500	2.125	1 1/8-12	1.375	.375
44-2	1.750	2.625	1 1/4-12	1.562	.437
Tapered Shafts With Threads
Shaft Code	Shaft Diam	Tprd Shaft Lgth	Thrd Shaft Lgth	Thread Size	Key Width
13-3	.500	.688	.500	5/16-32	.125
16-3	.625	.688	.719	1/2-20	.156
22-3	.875	1.125	.906	5/8-18	.250
25-3	1.000	1.375	1.062	3/4-16	.250
32-3	1.250	1.375	1.219	1"-12	.312
38-3	1.500	1.875	1.375	1 1/8-12	.375
44-3	1.750	2.125	1.562	1 1/4-12	.437
50-3	2.000	2.875	1.562	1 1/4-12	.500