Exhibit 4.1

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LUFKIN INDUSTRIES, INC.



Reference is made to the Articles of Incorporation of the Corporation, and
all amendments thereto, now or hereafter on file with the Secretary of the State of Texas, for a statement of the designations, preferences, limitations, and relative rights of the shares of each class of stock authorized to be issued by the
Corporation, the authority of the Board of Directors to fix and determine the relative rights and preferences of series of stock, if any, the denial of pre-emptive rights of shareholders, and other restrictions on the transfer or other disposition
of shares of stock of the Corporation; and reference is also made to the resolution or resolutions of the Board of Directors of the Corporation, now or hereafter on file with such Secretary of State, for a statement of the variations in the relative
rights and preferences of the shares of each series of each preferred or special class of stock which the Corporation is authorized to issue so far as the same has or shall have been fixed and determined. The Corporation will provide a copy of the
Articles of Incorporation of the Corporation and the above referenced resolutions of the Board of Directors of the Corporation, if any, to the record holder of this certificate, without charge, on written request to the Corporation at its principal
place of business or registered office.



PRE-EMPTIVE RIGHTS. No
holders of any shares now or hereafter authorized to be issued by this corporation have any pre-emptive rights to subscribe to any class of shares issued or which may be issued.



CUMULATIVE VOTING. No holders of any shares now or hereafter authorized to be issued by this corporation are entitled to
cumulative votes in the election of directors.



SHAREHOLDER
RIGHTS PLAN. This certificate also evidences and entitles the holder hereof to certain Rights as set forth in the Rights Agreement between Lufkin Industries, Inc. and First City National Bank of Lufkin (the Rights Agent) dated as of May
4, 1987 (the Rights Agreement), the terms of which are hereby incorporated herein by reference and a copy of which is on file at the principal offices of the Rights Agent. Under certain circumstances, as set forth in the Rights
Agreement, such Rights will be evidenced by separate certificates and will no longer be evidenced by this certificate. The Rights Agent will mail to the holder of this certificate a Copy of the Rights Agreement, as in effect on the date of mailing,
without charge promptly              receipt of a written request therefor. Under certain circumstances set forth in the Rights Agreement, Rights issued to, or held by, any Person who
             was or becomes an Acquiring Person or any Affiliate or Associate thereof (as such terms are defined in the Rights Agreement), whether currently held by or on behalf of such
Person or by any subsequent holder, may become null and void.



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|The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or
regulations:
|TEN COM -  as tenants in common                                                                                                                                                                    |  | UNIF GIFT MIN ACT. Custodian  |  | ______________________
|TEN ENT -    as tenants by the entireties                                                                                                                                                          |  | (Cust)                        |  | (Minor)               
|JT TEN  -      as joint tenants with right of                                                                                                                                                      |  | under Uniform Gifts to Minors
|survivorship and
not as tenants in common                                                                                                                                                          |  | Act                           |  |                       
|                                                                                                                                                                                                   |  | (State)                       |  |                       



Additional
abbreviations may also be used though not in the above list.



FOR VALUE
RECEIVED,

HEREBY SELL, ASSIGN AND TRANSFER UNTO



Please show Assignees Social
Security or other

taxpayer identifying number



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______________________________________________________________________________________________________________________________

(Please Print or Typewrite Name and Address, Including Zip Code, of Assignee)



______________________________________________________________________________________________________________________________



______________________________________________________________________________________________________________________________



_________________________________________________________________________________________________Shares of the common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint



________________________________________________________________________________________________Attorney to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.



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|Dated _________________________ |  | NOTICE: |  | ____________________________________________________________                                                                                                                                                                                                                                                               
|                                |  |         |  | The signature(s) to this assignment must correspond with the name as written upon the face of the certificate in every particular without
                     or enlargement or any change whatever.                                                                                                                      
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|                                |  |         |  | SIGNATURE(S) GUARANTEED:                                                                                                                                                                                                                                                                                                   
|                                |  |         |  | The signature(s) must be guaranteed by a member                      one of the major U.S.
stock exchanges or a commercial Bank or Trust Company. signature Guarantee must be signed by an authorized officer for the guaranteeing institution. A notary acknowledgement or a Savings and Loan guarantee is not acceptable.