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Page Title:
Table III. Semitrailer chassis dimensions and clearances. |
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|  MIL-S-62076B(AT)
without splices or joints. Where frame members are spliced on gooseneck chassis, joints shall be
reinforced to fulfill the dynamic loading requirements of 3.3.1. Splices shall be designed to
avoid stress concentration. Splice welds shall be continuous. The frame shall support the weight
of the fully loaded container(s) specified in table II. Model A, B and C semitrailer chassis shall
have the dimensions and clearances specified in table III. Container-chassis interface shall be in
accordance with ANSI MH5.6-1978.
TABLE III. Semitrailer chassis dimensions and clearances.
Description
Model A
Model B
Model C
14
14
Ground clearance (minimum), inches
14
Upper fifth wheel height, from ground to
underside of upper fifth wheel plate, inches,
48
48
plus or minus one inch
48
Distance from vertical centerline of kingpin
to front end of semitrailer (minimum),
36
36
inches
18
Swing radius from vertical centerline of kingpin
to most difficult point of semitrailer nose
60
60
(maximum), inches
60
3.4.1.1 Bolsters. The semitrailer chassis frame shall include full-width, steel front and rear
bolsters. Model C semitrailer chassis shall, in addition, include a mid-center, full-width, steel
bolster. Rear bolsters may serve as rear crossmembers. Twist lock and pin lock devices
specified in 3.4.1.2 shall be installed at the bolster ends. Bolsters shall be reinforced as
necessary in accordance with manufacturer's standard commercial practice.
3.4.1.2 Locking devices. The semitrailer chassis shall be equipped with twist-lock devices
on the frame bolsters to engage and secure the lower corner fittings of the container(s). Model A
and B chassis shall be provided with four twist-lock devices, one at each corner of the frame
front and rear bolsters, or with two pin-lock devices on the front bolster of the frame and with
two twist-lock devices on the rear bolster of the frame. Model C chassis shall be provided with
four twist-lock devices, one at each corner of the frame front and rear bolsters and with four
retractable twist-lock devices at the mid-center bolster for securing two 20 foot containers. The
locking devices shall be designed to preclude unintentional release. The locking devices and
their locations shall be in accordance with ANSI MH5.6-1978, and the devices shall meet the
requirements of Federal Motor Carrier Safety Regulation 393.100(e).
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