1/2" × 28 TPI External (Bolt) Thread Specifications

ASME Unified National Constant Pitch (UN) per ASME B1.1 — bolt/screw dimensions

Applications

Automotive suspension
Structural framing
Agricultural machinery

Technical Specifications

Parameter	Notation	Value
Threads Per Inch	n	28.0 TPI
Pitch	P	0.0357 in
Major Diameter	d	0.4989 in
Pitch Diameter	d2	0.4757 in
UNR Minor Dia (Max)	d1_max	0.4564 in
Allowance	es	0.0011 in
Tolerance Class	Class	2A
Thread Height	H	0.0309 in
Thread Depth	h3	0.0219 in
Crest Width	f / (P/8)	0.0045 in
Root Width	r / (P/4)	0.0089 in
Tap Drill	Drill	0.4643 in

Related Thread Sizes

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