N.Y. Comp. Codes R. & Regs. tit. 19, § 211.6 – Weighing in.

(a) The times and places of all weighing in ceremonies shall be as determined by the commission and all participants shall be weighed in on scales approved by the commission and in the presence of their opponent and representatives of the commission, unless otherwise directed or authorized by the commission. In the event of a postponement of a contest or exhibition for more than 24 hours for any reason, a second weigh-in and additional physical examination may be required by the commission on the day of or day prior to the date to which the contest or exhibition has been adjourned.

(b) The following weight classes, weight differences and glove weight guidelines shall be used for all professional boxing contests unless otherwise directed or authorized by the commission prior to commencement of the official weigh-in:

Weight class		Weight difference allowance	Glove weight
Junior Flyweight	Up to and including 108 pounds	Not more than 3 pounds	8 oz.
Flyweight	Over 108 to 112 pounds	Not more than 3 pounds	8 oz.
Junior Bantamweight	Over 112 to 115 pounds	Not more than 3 pounds	8 oz.
Bantamweight	Over 115 to 118 pounds	Not more than 3 pounds	8 oz.
Junior Featherweight	Over 118 to 122 pounds	Not more than 4 pounds	8 oz.
Featherweight	Over 122 to 126 pounds	Not more than 4 pounds	8 oz.
Junior Lightweight	Over 126 to 130 pounds	Not more than 4 pounds	8 oz.
Lightweight	Over 130 to 135 pounds	Not more than 5 pounds	8 oz.
Junior Welterweight	Over 135 to 140 pounds	Not more than 5 pounds	8 oz.
Welterweight	Over 140 to 147 pounds	Not more than 7 pounds	8 oz.
Junior Middleweight	Over 147 to 154 pounds	Not more than 7 pounds	10 oz.
Middleweight	Over 154 to 160 pounds	Not more than 7 pounds	10 oz.
Super Middleweight	Over 160 to 168 pounds	Not more than 7 pounds	10 oz.
Light Heavyweight	Over 168 to 175 pounds	Not more than 7 pounds	10 oz.
Cruiserweight	Over 175 to 200 pounds	Not more than 12 pounds	10 oz.
Heavyweight	Over 200 pounds	No limit	10 oz.

(c) The commission may, in its discretion, waive the weight difference allowance for a bout as provided in subdivision (b) of this section, so long as the official weight of both competitors is within the range allowed for the same weight class and both competitors consent to the waiver in writing.
(d) In nontitle bouts, boxers overweight under the terms of the contract may be suspended after the match for such period as the commission may decide.
(e) Whenever a recognized holder of a championship engages in a championship contest in this State, he must be at the weight required by the class for which he holds the championship except when a champion of one class competes as a contender for the championship in another class.