#4 × 48 TPI External (Bolt) Thread Specifications
ASME Unified National Fine (UNF) per ASME B1.1 — bolt/screw dimensions
Applications
Computer case fans
Electrical switches
Small appliances
Technical Specifications
Parameter
Notation
Value
Threads Per Inch
n
48.0 TPI
Pitch
P
0.0208 in
Major Diameter
d
0.1113 in
Pitch Diameter
d2
0.0978 in
UNR Minor Dia (Max)
d1_max
0.0865 in
Allowance
es
0.0007 in
Tolerance Class
Class
2A
Thread Height
H
0.0180 in
Thread Depth
h3
0.0128 in
Crest Width
f / (P/8)
0.0026 in
Root Width
r / (P/4)
0.0052 in
Tap Drill
Drill
0.0912 in
Related Thread Sizes
#4 × 40 TPI (UNC)
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