UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 12b-25

NOTIFICATION OF LATE FILING

SEC File Number

001-12068

CUSIP Number

N/A

(Check One): o Form 10-K o Form 20-F o Form 11-K x Form 10-Q o Form 10-D o Form N-SAR o Form N-CSR

For Period Ended: October 1, 2006   

[  ]Transition Report on Form 10-K

[  ]Transition Report on Form 20-F

[  ]Transition Report on Form 11-K

[  ]Transition Report on Form 10-Q

[  ]Transition Report on Form N-SAR

For the Transition Period Ended: _________________________

Read Instruction (on back page) Before Preparing Form. Please Print or Type.

Nothing in this form shall be construed to imply that the Commission has verified any

information contained herein.

If the notification relates to a portion of the filing checked above, identify the Item(s) to which the notification relates: N/A

PART I — REGISTRANT INFORMATION

     Metaldyne Corporation

Full Name of Registrant

     MascoTech, Inc.

Former Name if Applicable

     47659 Halyard Drive

Address of Principal Executive Office (Street and Number)

     Plymouth, Michigan 48170-2429

City, State and Zip Code

PART II — RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate)

x (a)   The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense;

  x (b)   The subject annual report, semi-annual report, transition report on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or portion thereof, will be filed on or before the fifteenth calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q or subject distribution report on Form 10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and

o (c)   The accountant’s statement or other exhibit required by Rule 12b-25(c) has been attached if applicable.

PART III — NARRATIVE

State below in reasonable detail the reasons why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-SAR, N-CSR, or the transition report or portion thereof, could not be filed within the prescribed time period.

The Registrant’s Form 10-Q for the period ending October 1, 2006, which was due on November 15, 2006, was received by the Commission at 9:43 p.m. (EST) on November 15, 2006, and is currently available on EDGAR.

PART IV — OTHER INFORMATION

1.Name and telephone number of person to contact in regard to this notification

Jeffrey M. Stafeil(734) 207-6200

(Name) (Area Code) (Telephone Number)

2.Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If answer is no, identify report(s). x  Yes     No o

3.Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? o  Yes     No o

If so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made.

The Registrant’s Form 10-Q for the period ending October 1, 2006, was received by the Commission at 9:43 p.m. (EST) on November 15, 2006, and is currently available on EDGAR.

                  METALDYNE CORPORATION                 

(Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.

Date November 16, 2006 By:  /s/ Jeffrey M. Stafeil           Name:  Jeffrey M. Stafeil         Title:   Executive Vice President and Chief Financial Officer