NN (NNBR) 8-K/A Financial Statements and Exhibits

Exhibit 23.1

Consent of Independent Auditor

We consent to the incorporation by reference in the Registration Statements(No. 333-216737) on Form S-3 and (Nos.333-174519,333-130395,333-69588,333-50934, and333-216739) on Form S-8 of NN, Inc. of our report dated April 4, 2018 relating to the consolidated financial statements of PMG Intermediate Holding Corporation and Subsidiaries, appearing in this Current Report on Form8-K/A.

/s/ RSM US LLP

Elkhart, Indiana

June 4, 2018