Exhibit 3.1

Amendment to the

Restated By-Laws of

NN, Inc.

Effective: November 11, 2014

The Restated By-Laws of NN, Inc., as amended, are further amended as follows:

1. Article II, Section 10 of the Corporation’s By-Laws be, and it hereby is, amended to read in its entirety as follows:

“Section (10) Procedure for Election of Directors; Required Vote; Resignation Policy.

(a) Except as set forth below, election of directors at all meetings of the stockholders at which directors are to be elected shall be by ballot, and, subject to the rights of the holders of any series of Preferred Stock to elect directors under specified circumstances, a majority of votes cast at any meeting for the election of directors at which a quorum is present shall elect directors. For purposes of this By-Law, a majority of votes cast shall mean that the number of shares voted “for” a director’s election must exceed the number of votes cast “against” the election of that director. Votes cast shall include direction to withhold authority in each case and exclude abstentions with respect to that director’s election. Notwithstanding the foregoing, in the event of a “contested election” of directors, directors shall be elected by the vote of a plurality of the votes cast at any meeting for the election of directors at which a quorum is present. For purposes of these Bylaws, a “contested election” shall mean any election of directors where, as of the tenth (10th) day preceding the date on which the Corporation first mails its notice of meeting, for the meeting at which directors are being elected, the number of nominees for director exceeds the number of directors to be elected. Except as otherwise provided by law, the Certificate of Incorporation, or these By-Laws, in all matters other than the election of directors, the affirmative vote of a majority of the shares present in person or represented by proxy at the meeting and entitled to vote on the matter shall be the act of the stockholders.

(b) If a nominee for director who is an incumbent director is not elected and no successor has been elected at such meeting, the director shall promptly tender his or her resignation to the Board of Directors. The Governance Committee shall make a recommendation to the Board of Directors as to whether to accept or reject the tendered resignation, or whether other action should be taken. The Board of Directors shall act on the tendered resignation, taking into account the Governance Committee’s recommendation, and publicly disclose (by a press release, a filing with the Securities and Exchange Commission or other broadly disseminated means of communication) its decision regarding the tendered resignation and the rationale behind the decision within 90 days from the date of the certification of the election results. The Governance Committee in making its recommendation, and the Board of Directors in making its decision, may each consider any factors or other information that it considers appropriate and relevant. The director who tenders his or her resignation shall not participate in the recommendation of the Governance Committee or the decision of the Board of Directors with respect to his or her resignation. If such incumbent director’s resignation is not accepted by the Board of Directors, such director shall continue to serve until his or her successor is duly elected, or his or her earlier

resignation or removal. If a director’s resignation is accepted by the Board of Directors pursuant to these By-Laws, or if a nominee for director is not elected and the nominee is not an incumbent director, then the Board of Directors, in its sole discretion, may fill any resulting vacancy or may decrease the size of the Board of Directors pursuant to the provisions of these By-laws.”