3/8" × 24 TPI Internal (Nut) Thread Specifications

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

Applications

Engine headers/intakes
Deck building
Light structural steel

Technical Specifications

Parameter	Notation	Value
Threads Per Inch	n	24.0 TPI
Pitch	P	0.0417 in
Major Diameter (MinRef)	D_min	0.375 in
Pitch Diameter	D2	0.3479 in
Minor Diameter	D1	0.3300 in
Tolerance Class	Class	2B
Thread Height	H	0.0361 in
Thread Depth	h3	0.0256 in
Crest Width	f	0.0104 in
Root Width	r	0.0052 in
Tap Drill	Drill	0.3333 in

Related Thread Sizes

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