New York Codes, Rules and Regulations › Title 15 - Department of Motor Vehicles › Chapter I - REGULATIONS OF THE COMMISSIONER › Subchapter D - Equipment › Part 57 - Trailer Hitches › Section 57.5 - Tables and figures

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
Table
				  1.
TABLE 1-LIGHT SERVICE DEVICES BREAKING STRENGTH FOR
					 COUPLINGS AND BALLS
Trailer Classification
Trailer Coupling
								  Designation
Minimum Ball Diameter-Inches
								  (where ball-type hitch is used)
Minimum Breaking Point
								  Requirements
Pounds
Class 1 (2,000 lbs. Maximum GTW)
No. 1
1*7/8
Longitudinal tension:
6,000
Longitudinal compression:
6,000
Transverse thrust:
2,000
Vertical tension:
2,500
Vertical compression:
2,500
Class 2 (3,500 lbs. Maximum GTW)
No. 2
2
Longitudinal tension:
10,500
Longitudinal compression:
10,500
Transverse thrust:
3,000
Vertical tension:
3,900
Vertical compression:
4,500
Class 3 (5,000 lbs. Maximum GTW)
No. 3
2
Longitudinal tension:
15,000
Longitudinal compression:
15,000
Transverse thrust:
4,000
Vertical tension:
3,900
Vertical compression:
7,000
Class 4 (5,000 +thru 10,000 lbs. Maximum
								GTW)
No. 4
Ball and bolt shall be of such size and
								strength as to conform to the minimum breaking strength requirements of the
								mating coupling required for the specific load of Class 4 Trailer.
Longitudinal tension: Max. GTW x 3
Longitudinal compression: Max. GTW * 3
Transverse thrust: Max. GTW * 1
Vertical tension: 3,800 +Max GTW ÷ 50
Vertical compression: Max. GTW * 1.4
(b)
Table 2.
TABLE 2-HITCH TEST FORCES
STEP
WEIGHT CARRYING
								  HITCH
WEIGHT DISTRIBUTING
								  HITCH
Force
Direction
Force
Direction
a
V = .47R + 480
Downward
V = .045R + 1650
Downward
L = .47R + 480
Compressive
M = 51,000
See Figure 1
b
L = .23R + 1530
Tensile
L = .067R + 2070
Tensile
V = .15R
Downward
V = .15R
Downward
c
Compressive
L = .067R + 2070
Compressive
Downward
V = .15R
Downward
d
T = .20R + 500
Leftward
T = .20R + 500
Leftward
e
T = .20R + 500
Rightward
T = .20R + 500
Rightward
f
Not Applicable
Not Applicable
M = 112,000
See Figure 1
V = .15R
Downward
_____________________________________________________
V = Vertical Force (lbs.)
L = Longitudinal Force (lbs.)
T = Transverse Force (lbs.)
M = Spring Bar Moment (inch-lbs.)
R = Hitch Rating in Terms of GVWR (lbs.)
_____________________________________________________
Click
					 to view image
(a) Apply the
				  specified downward vertical force concurrently with the specified compressive
				  longitudinal force or movement.
(b)
				  Apply the specified tensile longitudinal force concurrently with the specified
				  downward vertical force.
(c) Apply
				  the specified compressive longitudinal force concurrently with the specified
				  downward vertical force.
(d) Apply
				  the specified leftward transverse force.
(e) Apply the specified rightward transverse
				  force.
(f) For htiches with weight
				  distributing capability, apply the specified spring bar, or levelling moment,
				  concurrently with the specified downward vertical force.
All forces in steps (a) through (e) are to be applied along
					 an axis which intersects the center of the ball. All forces are to be applied
					 with an onset rate of not more than 150 pounds per second, and maintained at
					 the maximum specified force level for at least five seconds.
(3) Each hitch, when tested as specified
				  above, shall be capable of withstanding the forces applied in accordance with
				  note (2), immediately above, without causing permanent deformation of the ball
				  platform, such that the final position of the ball axis shall not depart more
				  than five degrees from its original, nominally vertical,
				  position.