Exhibit 3.33

State of Delaware

Secretary of State

Division of Corporations

Delivered 01:32 PM 09/17/2009

FILED 01:20 PM 09/17/2009

SRV 090863056 - 4731791 FILE

CERTIFICATE OF FORMATION

OF

METALDYNE SINTERED RIDGWAY, LLC

This Certificate of Formation is being executed as of September 17, 2009, for the purpose of forming a limited liability company pursuant to the Delaware Limited Liability Company Act, 6 Del. C. § 18-201, et seq.

The undersigned, being duly authorized to execute and file this Certificate, does hereby certify as follows:

1.Name. The name of the limited liability company is Metaldyne Sintered Ridgway, LLC (the “Company”).

2.Registered Office and Registered Agent. The Company’s registered office in the State of Delaware is located at 1209 Orange Street, City of Wilmington, New Castle County, Delaware 19801. The registered agent of the Company for service of process at such address is The Corporation Trust Company.

IN WITNESS WHEREOF, the undersigned has duly executed this Certificate of Formation as of the day and year first above written.

By:	/s/ Cindy Oberdorff
	Cindy Oberdorff, an Authorized Person