TM-5-2330-325-13-P
SEMITRAILER, MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), 40 TON, M870A3
TECHNICAL MANUAL; OPERATOR AND FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JUNE 2014
TM-5-2330-325-13-P - Page 426 of 648
FASTENER SIZE AND THREAD PATTERN
NOTE
Unless followed with “LH” (e.g.,3/4-10 UNC-2A-LH), threads are right-hand.
Threaded fasteners are categorized according to diameter of fastener shank. Thread styles are divided into
broad groups, two most common being coarse (Unified Coarse-UNC) and fine (Unified Fine-UNF). These
groups are defined by the number of threads per inch in the bolt shanks. In addition, threads are categorized
by thread class, which is a measure of degree between threads of the bolt or screws (external threads) and
threads of attaching nut or tapped hole (internal threads). The most common thread class for bolts and
screws is Class 2.
NOMINAL SIZE
THREAD CLASS
THREAD SYMBOL
NO. THREADS/INCH
3/4
10
UNC
2A
2A
3A
1A
2B
3B
1B
MEDIUM FIT
CLOSE FIT
LOOSE FIT
INTERNAL
INTERNAL
EXTERNAL
Table H-4.
Thread Classes and Description.
466-0106
Figure 3.
Fastener Size.
THREAD
LENGTH
THREAD
RUNOUT
LENGTH
NOMINAL
DIAMETER
GRIP
LENGTH
HEIGHT
OF NUT
BODY
LENGTH
THICKNESS
OR HEIGHT
OF HEAD
LENGTH
(BOLT SHAFT)
466-0107
Figure 4.
Thread Pattern.
END OF TASK
END OF WORK PACKAGE
TM 5-2330-325-13&P
0095
0095-6
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