Exhibit 5.1

Gibson, Dunn & Crutcher LLP

811 Main Street

Houston, TX 77002-6117

Tel 346.718.6600

gibsondunn.com

June 11, 2024

Forum Energy Technologies, Inc.

10344 Sam Houston Park Drive, Suite 300

Houston, Texas 77064

Re:    Forum Energy Technologies, Inc.
Registration Statement on Form S-3

Ladies and Gentlemen:

    We have acted as counsel to Forum Energy Technologies, Inc., a Delaware corporation (the “Company”), in connection with the preparation and filing with the U.S. Securities and Exchange Commission (the “Commission”) of a Registration Statement on Form S-3 (the “Registration Statement”) under the Securities Act of 1933, as amended (the “Securities Act”), relating to the registration under the Securities Act of the proposed offering and sale from time to time pursuant to Rule 415 under the Securities Act by the selling stockholders named therein, together or separately, of up to 1,946,038 shares (the “Shares”) of the Company’s common stock, par value $0.01 per share.

    In arriving at the opinion expressed below, we have examined originals, or copies certified or otherwise identified to our satisfaction as being true and complete copies of the originals, of such documents, corporate records, certificates of officers of the Company and of public officials and other instruments as we have deemed necessary or advisable to enable us to render the opinion expressed below. In our examination, we have assumed, without independent investigation, the genuineness of all signatures, the legal capacity and competency of all natural persons, the authenticity of all documents submitted to us as originals and the conformity to original documents of all documents submitted to us as copies. As to any facts material to this opinion, we have relied to the extent we deemed appropriate and without independent investigation upon statements and representations of officers and other representatives of the Company and others.

    Based upon the foregoing, and subject to the assumptions, exceptions, qualifications and limitations set forth herein, we are of the opinion that the Shares are validly issued, fully paid and non-assessable.

    We render no opinion herein as to matters involving the laws of any jurisdiction other than the Delaware General Corporation Law. We are not admitted to practice in the State of Delaware; however, we are generally familiar with the Delaware General Corporation Law as currently in effect and have made such inquiries as we consider necessary to render this

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Forum Energy Technologies, Inc.

June 11, 2024

Page 2

opinion. This opinion is limited to the effect of the current state of the laws of the State of Delaware, to the limited extent set forth above, and the facts as they currently exist. We assume no obligation to revise or supplement this opinion in the event of future changes in such laws or the interpretations thereof or such facts.

    We consent to the filing of this opinion as an exhibit to the Registration Statement, and we further consent to the use of our name under the caption “Legal Matters” in the Registration Statement and the prospectus that forms a part thereof. In giving these consents, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission promulgated thereunder.

Very truly yours,

/s/ Gibson, Dunn & Crutcher LLP