1 3/8" × 12 TPI External (Bolt) Thread Specifications
ASME Unified National Fine (UNF) per ASME B1.1 — bolt/screw dimensions
Applications
General purpose
Industrial (US)
Technical Specifications
Parameter
Notation
Value
Threads Per Inch
n
12.0 TPI
Pitch
P
0.0833 in
Major Diameter
d
1.3731 in
Pitch Diameter
d2
1.3190 in
UNR Minor Dia (Max)
d1_max
1.2739 in
Allowance
es
0.0019 in
Tolerance Class
Class
2A
Thread Height
H
0.0722 in
Thread Depth
h3
0.0511 in
Crest Width
f / (P/8)
0.0104 in
Root Width
r / (P/4)
0.0208 in
Tap Drill
Drill
1.2917 in
Related Thread Sizes
1 3/8" × 6 TPI (UNC)
1 3/8" × 18 TPI (UNEF)
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