ASME B18.5 Flat Countersunk Head Elevator Bolts

Dimensions of Flat Countersunk Head Elevator Bolts (Inch)
Nominal Size or Basic Bolt Diameter [Note (1)]		Body Diameter, E		Head Diameter, A			Head Angle,C(Ref.)	Max. Flat on Min. Dia. Head,F	Head Height, H		Square Width, O		Square Depth,P		Maximum Corner Radius on Square,Q	Maximum Fillet Radius,R[Note(2)]
Nominal Size or Basic Bolt Diameter [Note (1)]		Max.	Min.	Max. Edge Sharp	Min. Edge Sharp	Min. Edge Flat	Head Angle,C(Ref.)	Max. Flat on Min. Dia. Head,F	Max.	Min.	Max.	Min.	Max.	Min.	Maximum Corner Radius on Square,Q	Maximum Fillet Radius,R[Note(2)]
No.10	0.19	0.199	0.182	0.79	0.75	0.74	9	0.025	0.082	0.062	0.21	0.185	0.125	0.094	0.031	0.031
1/4	0.25	0.26	0.237	1.008	0.969	0.938	9	0.035	0.098	0.078	0.28	0.245	0.219	0.188	0.031	0.031
5/16	0.3125	0.324	0.298	1.227	1.188	1.157	9	0.035	0.114	0.094	0.342	0.307	0.25	0.219	0.031	0.031
3/8	0.375	0.388	0.36	1.352	1.312	1.272	11	0.04	0.145	0.125	0.405	0.368	0.25	0.219	0.047	0.031
7/16	0.4375	0.452	0.421	1.477	1.438	1.397	13	0.04	0.176	0.156	0.468	0.431	0.281	0.25	0.047	0.031
1/2	0.5	0.515	0.483	1.602	1.562	1.522	12	0.04	0.176	0.156	0.53	0.492	0.281	0.25	0.047	0.031

GENERAL NOTE: For additional requirements, refer to section 2, General Data.
NOTES:
(1) Where specifying nominal size in decimals, zeros preceding decimal and in the four th decimal place shall be omitted.
(2) The minimum radius is one half of the value shown.