#1 × 64 TPI External (Bolt) Thread Specifications

ASME Unified National Coarse (UNC) per ASME B1.1 — bolt/screw dimensions

Applications

General purpose
Industrial (US)

Technical Specifications

Parameter	Notation	Value
Threads Per Inch	n	64.0 TPI
Pitch	P	0.0156 in
Major Diameter	d	0.0724 in
Pitch Diameter	d2	0.0623 in
UNR Minor Dia (Max)	d1_max	0.0538 in
Allowance	es	0.0006 in
Tolerance Class	Class	2A
Thread Height	H	0.0135 in
Thread Depth	h3	0.0096 in
Crest Width	f / (P/8)	0.0020 in
Root Width	r / (P/4)	0.0039 in
Tap Drill	Drill	0.0574 in

Related Thread Sizes

#1 × 72 TPI (UNF)

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