Exhibit 5.1

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August 14, 2025

SPX Technologies, Inc.

6325 Ardrey Kell Road, Suite 400

Charlotte, North Carolina 28277

Re:  Registration Statement No. 333-289489; 3,058,511 shares of Common Stock, par value $0.01 per share

To the addressee set forth above:

We have acted as special counsel to SPX Technologies, Inc., a Delaware corporation (the “Company”), in connection with the issuance of up to 3,058,511 shares (the “Shares”) of common stock, par value $0.01 per share (the “Common Stock”). The Shares are included in a registration statement on Form S–3 under the Securities Act of 1933, as amended (the “Act”), filed with the Securities and Exchange Commission (the “Commission”) on August 11, 2025 (Registration No. 333–289489) (as so filed and as amended, the “Registration Statement”), including a base prospectus dated August 11, 2025 (the “Base Prospectus”), a preliminary prospectus supplement dated August 11, 2025 filed with the Commission pursuant to Rule 424(b) under the Act (together with the Base Prospectus, the “Preliminary Prospectus”), and a prospectus supplement dated August 12, 2025 filed with the Commission pursuant to Rule 424(b) under the Act (together with the Base Prospectus, the “Prospectus”).  The shares are being sold pursuant to an underwriting agreement, dated August 12, 2025, by and among the Company and, BofA Securities, Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein (the “Underwriting Agreement”). This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement, the Preliminary Prospectus or related Prospectus, other than as expressly stated herein with respect to the issue of the Shares.

As such counsel, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter.  With your consent, we have relied upon certificates and other assurances of officers of the Company and others as to factual matters without having independently verified such factual matters.  We are opining herein as to General Corporation Law of the State of Delaware, and we express no opinion with respect to any other laws.

August 14, 2025

Page 2

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, when the Shares shall have been duly registered on the books of the transfer agent and registrar therefor in the name or on behalf of the purchasers, and have been issued by the Company against payment therefor (not less than par value) in the circumstances contemplated by the Underwriting Agreement, the issue and sale of the Shares will have been duly authorized by all necessary corporate action of the Company, and the Shares will be validly issued, and the Shares will be fully paid and nonassessable.  In rendering the foregoing opinion, we have assumed that the Company will comply with all applicable notice requirements regarding uncertificated shares provided in the General Corporation Law of the State of Delaware.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act.  We consent to your filing this opinion as an exhibit to the Company’s Current Report on Form 8-K filed with the Commission on August 14, 2025 and to the reference to our firm in the Prospectus under the heading “Legal Matters.”  In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

Sincerely,

/s/ Latham & Watkins LLP