Product family

Inch ASME Flat Head Square Neck Bolts

ASME B18.5

Available variants

Compare variations by dimension, color, finish, and material.

Part Number	Thread Size	Diameter	Diameter (Min.)	Diameter (Max.)	Thread Pitch	Length	Thread Length	Head Diameter (Min.)	Head Diameter (Max.)	Head Height(Min.)	Head Height (Max.)	Collar Diameter	Collar Height	Head Type	Neck Style	Thread Direction	Thread Amount	Measurement System	Specification
IAFHSQNB003-1420X112X15	1/4"-20	0.25	0.237	0.26	20	1.5	1.344	0.59	0.64	0.078	0.098	0.26	0.156	Flat Head	Square Neck	Right Hand	Full Thread	Inch	ASME B18.5
IAFHSQNB003-1420X114X125	1/4"-20	0.25	0.237	0.26	20	1.25	1.094	0.59	0.64	0.078	0.098	0.26	0.156	Flat Head	Square Neck	Right Hand	Full Thread	Inch	ASME B18.5
IAFHSQNB003-1420X178	1/4"-20	0.25	0.237	0.26	20	1.875	1.719	0.59	0.64	0.078	0.098	0.26	0.156	Flat Head	Square Neck	Right Hand	Full Thread	Inch	ASME B18.5
IAFHSQNB003-1420X212	1/4"-20	0.25	0.237	0.26	20	2.5	2.344	0.59	0.64	0.078	0.098	0.26	0.156	Flat Head	Square Neck	Right Hand	Full Thread	Inch	ASME B18.5
IAFHSQNB003-1420X214	1/4"-20	0.25	0.237	0.26	20	2.25	2.094	0.59	0.64	0.078	0.098	0.26	0.156	Flat Head	Square Neck	Right Hand	Full Thread	Inch	ASME B18.5
IAFHSQNB025-1420X78	1/4"-20	0.25	0.237	0.26	20	0.875	0.75	0.969	1.008	0.078	0.098	0.28	0.219	Flat Head	Square Neck	Right Hand	Standard Thread Length	Inch	ASME B18.5
IAFHSQNB025-51618X34	5/16"-18	0.3125	0.298	0.324	18	0.75	0.5	1.188	1.227	0.094	0.114	0.342	0.25	Flat Head	Square Neck	Right Hand	Standard Thread Length	Inch	ASME B18.5
IAFHSQNB025-3816X234	3/8"-16	0.375	0.36	0.388	16	2.75	1	1.312	1.352	0.125	0.145	0.405	0.25	Flat Head	Square Neck	Right Hand	Standard Thread Length	Inch	ASME B18.5