5/8" × 18 TPI Internal (Nut) Thread Specifications

ASME Unified National Fine (UNF) per ASME B1.1 — nut/tapped hole dimensions

Applications

Trailer hitches
Highway guardrails
Heavy machinery

Technical Specifications

Parameter	Notation	Value
Threads Per Inch	n	18.0 TPI
Pitch	P	0.0556 in
Major Diameter (MinRef)	D_min	0.625 in
Pitch Diameter	D2	0.5889 in
Minor Diameter	D1	0.5650 in
Tolerance Class	Class	2B
Thread Height	H	0.0481 in
Thread Depth	h3	0.0341 in
Crest Width	f	0.0139 in
Root Width	r	0.0069 in
Tap Drill	Drill	0.5694 in

Related Thread Sizes

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