< HOME back to technical data

Square Kellys, Hexagon Kellys

Kelly Specifications

A.P.I. Nom. Size	Max. Bore A	Across Flats B	Across Corner C	Radius R	Radius Rc*
2-1/2	1-1/4	2-1/2	3-9/32	5/16	1-5/8
3	1-3/4	3	3-15/16	3/8	1-15/16
3-1/2	2-1/4	3-1/2	4-17/32	1/2	2-7/32
4-1/4	2-3/4	4-1/4	5-9/16	1/2	2-3/4
5-1/4	3-1/2	5-1/4	6-29/32	5/8	3-3/8
**6	3-1/2	6	7-7/8	3/4	–

A.P.I. St’d. Size	Alternate	Max. Bore A	Across Flats B	Across Corner C	Radius R	Radius Rc*
3	–	1-1/2	3	3-3/8	1/4	1-11/16
3-1/2	–	1-3/4	3-1/2	3-31/32	1/4	1-31/32
–	3-1/2	2-1/4	3-3/4	4-1/4	5/16	–
4-1/4	–	2-1/4	4-1/4	4-13/16	5/16	2-25/64
–	4-1/2	3-1/4	4-27/32	5-1/2	5/16
5-1/4	–	3-1/4	5-1/4	5-31/32	3/8	2-61/64
–	5-9/16	4	5-31/32	6-3/4	3/8	–
6	–	4	6	6-13/16	3/8	3-13/32
	6-5/8	4-1/4	6-27/32	7-3/4	1/2	–