FORM 11-K


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549




[X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES  EXCHANGE ACT OF
1934

For the fiscal year ended December 31, 1998

                                       OR

[ ] TRANSITION  REPORT  PURSUANT TO SECTION 15(d) OF THE  SECURITIES  EXCHANGE
ACT OF 1934

For the transition period from ____________ to ____________


Commission file number 1-475


A.     Full title of the plan and the  address of the plan,  if  different  from
       that of the issuer named below:


                   A. O. Smith Profit Sharing Retirement Plan



B.     Name of  issuer  of the  securities  held  pursuant  to the  plan and the
       address of its principal executive office:

                             A. O. Smith Corporation
                              11270 West Park Place
                               Milwaukee, WI 53224










                              REQUIRED INFORMATION



1.     Not Applicable.

2.     Not Applicable.

3.     Not Applicable.

4.     The A. O. Smith Profit Sharing Retirement Plan (the "Plan") is subject to
       the requirements of the Employee  Retirement  Income Security Act of 1974
       ("ERISA").  Attached  hereto  is a copy  of  the  most  recent  financial
       statements  and  schedules of the Plan  prepared in  accordance  with the
       financial reporting requirements of ERISA.


Exhibits
- --------

23.1  Consent of Independent Auditors







                                   SIGNATURES


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
trustees (or other persons who administer the Plan) have duly caused this annual
report to be signed by the undersigned thereunto duly authorized.

                                    A. O. Smith Profit Sharing Retirement Plan



Date:      06/25/1999               By:  /s/Duane R. Carlson
                                    Duane R. Carlson
                                    Manager Pension and Savings Plan













                                    CONTENTS




A. O. Smith Profit Sharing Retirement Plan:



Independent Auditors' Report
- ----------------------------


Financial Statements
- --------------------

  Statement of Net Assets Available for Benefits                       1

  Statement of Changes in Net Assets Available for Benefits            2

  Notes to Financial Statements                                     3-12


Supplementary Information
- -------------------------

  A schedule of  party-in-interest  transactions has not been presented  because
  there were no  party-in-interest  transactions  which are  prohibited by ERISA
  Section 406 and for which there is no statutory or administrative exemption.














                          INDEPENDENT AUDITORS' REPORT


Benefits Committee
A. O. Smith Profit Sharing
  Retirement Plan
Milwaukee, Wisconsin

We have audited the accompanying statements of net assets available for benefits
of the A. O. Smith Profit  Sharing  Retirement  Plan as of December 31, 1998 and
1997, and the related  statement of changes in net assets available for benefits
for the years then ended.  These financial  statements are the responsibility of
the  Plan's  management.  Our  responsibility  is to express an opinion on these
financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements,  referred to above, of the A. O. Smith
Profit  Sharing  Retirement  Plan as of December 31, 1998 and 1997,  and for the
years  then ended  present  fairly,  in all  material  respects,  the net assets
available for benefits of the A. O. Smith Profit Sharing  Retirement  Plan as of
December  31,  1998 and 1997,  and the changes in its net assets  available  for
benefits  for the  years  then  ended  in  conformity  with  generally  accepted
accounting principles.








June 24, 1999                           REILLY, PENNER & BENTON LLP
Milwaukee, Wisconsin









                   A. O. SMITH PROFIT SHARING RETIREMENT PLAN

                 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS



                                                          December 31,
                                                 -------------------------------
Assets:                                              1998             1997
                                                 --------------  ---------------

    Investment in A. O. Smith Master
      Trust at fair value (Notes 2 and 3)        $ 174,643,787    $ 153,090,013
    Participant loans at estimated fair value        3,113,126        2,518,338
                                                 --------------  ---------------
           Total                                   177,756,913      155,608,351

    Receivables:
      Interest income                                   19,494           94,200
      Company contribution                           3,495,846        3,512,891
      Participant contribution                         173,362                -
                                                 --------------  ---------------

         Total receivables                           3,688,702        3,607,091
                                                 --------------  ---------------

           Total Assets                            181,445,615      159,215,442

Liabilities:

    Due to broker for securities purchased             221,370           76,073
                                                 --------------  ---------------

Net assets available for benefits                $ 181,224,245    $ 159,139,369
                                                 ==============  ===============




            The accompanying notes to the financial statements are an
                        integral part of this statement.


                                       1








                   A. O. SMITH PROFIT SHARING RETIREMENT PLAN

            STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS


Years ended December 31 ------------------------------- Increases: 1998 1997 -------------- -------------- Investment in A. O. Smith Master Trust at fair value: Net investment income $ 1,260,859 $ 2,483,372 Realized gain on investment transactions 20,939,144 33,671,864 Unrealized appreciation (depreciation) on investments 4,472,555 (2,049,251) -------------- -------------- Total 26,672,558 34,105,985 Interest income from participant loans 182,271 290,009 -------------- -------------- Total investment income 26,854,829 34,395,994 Contributions: Company 3,495,846 3,512,891 Participants 5,096,618 5,596,596 Rollovers 255,310 1,286,032 -------------- -------------- Total contributions 8,847,774 10,395,519 Total increases 35,702,603 44,791,513 Decreases: Benefit and withdrawal payments 14,102,221 14,249,182 -------------- -------------- Net increase before transfers 21,600,382 30,542,331 Transfers from (to) other plans 484,494 (53,337,450) -------------- -------------- Increase (decrease) in net assets available for benefits 22,084,876 (22,795,119) Net assets available for benefits: Beginning of the year 159,139,369 181,934,488 -------------- -------------- End of the year $ 181,224,245 $ 159,139,369 ============== ==============
The accompanying notes to the financial statements are an integral part of this statement. 2 A. O. SMITH PROFIT SHARING RETIREMENT PLAN NOTES TO FINANCIAL STATEMENTS December 31, 1998 and 1997 1. Basis of presentation and significant accounting policies General - The A. O. Smith Profit Sharing Retirement Plan was established in 1956 to cover salaried or commissioned nonunion employees of the A. O. Smith Corporation, its subsidiaries and affiliates. Employees are eligible to participate in the Plan if they are scheduled to complete 1,000 hours of service in a Plan year. Employees elect to participate by designating a portion of their salary to be contributed to an account maintained on behalf of the participant. Investment valuation - All of the Plan's investments are invested in the A. O. Smith Profit Sharing Retirement Master Trust (Master Trust) (Note 2) which are valued at their market price. The financial statements of the Master Trust are presented separately and are incorporated by reference to the financial statements of this Plan. The investment in the A. O. Smith Stable Asset Income Fund is valued at the redemption price established by the trustee. Participant loans receivable are valued at cost which approximates fair value. Contributions and benefit and withdrawal payments - The Plan is a defined contribution plan to which participants may make contributions of not less than 1% or more than 16% of their compensation. The Plan provides for all participant contributions to be made with tax-deferred dollars under Section 401(k) of the Internal Revenue Code. These contributions are excluded from the participant's current wages for federal income tax purposes. The Internal Revenue Code has set a maximum of $10,000 and $9,500 for tax-deferred contributions that may be excluded for any individual participant in 1998 and 1997, respectively. No federal income tax is paid on the tax-deferred contributions and growth thereon until the participant withdraws them from the Plan. Contributions from participants are recorded when A. O. Smith Corporation (the Company) makes payroll deductions from Plan participants. Contributions from the Company are accrued in the period in which they become obligations of the Company in accordance with terms of the Plan. For each $1.00 of 401(k) Tax-Deferred contributions, up to 6% of a participant's salary, the Company guarantees a contribution of $.35. Additional Company contributions in excess of $.35 will be based on the Company's return on net worth. The additional Company matching contribution amount is $.05 times the return on net worth between 5% and 10%, plus $.10 times the return on net worth in excess of 10% up to a maximum of 18%. Therefore, the guaranteed and additional contributions can combine for a maximum Company contribution of $1.40 of participant contributions up to 6% of salary. 3 1. Basis of presentation and significant accounting policies (continued) Vesting - Participants of the Plan are 0% vested in employer contributions with less than two years of participation, 40% vested after two years, 60% after three years, 80% after four years and fully vested after five years of participation. Participants are always fully vested in their own contributions. A separate account is maintained for each participant. The separate account balances are adjusted periodically as follows: a. Semi-monthly for participant's contributions. b. Annually for Company contributions. c. Daily for a proportionate share of increases and decreases in the fair value of Plan assets. d. The accounts are periodically adjusted for forfeitures which are reallocated to participants in the same manner as if they were a Company matching contribution for the Plan year. e. Daily for benefit and withdrawal payments which consist of the following: i. Upon retirement, death, disability, or termination of employment resulting from permanent reduction of personnel, an employee may withdraw any amount or the entire account balance for any reason. One withdrawal of this type is allowed per calendar year, up to age 70 1/2. At 70 1/2 an account distribution election must be made. ii. Upon termination of employment for other reasons, the balance in the separate account (reduced for nonvested Company contributions and growth thereon based on years of service) may be paid in a lump sum. iii.An active participant age 59 1/2 or older may withdraw the balance in the separate account. The balance in the separate account is paid to the participant in a lump sum. iv. A participant may withdraw all or any portion of the principal balance attributable to after-tax contributions and earnings and rollover contributions and earnings. All or any portion of the balance attributable to Company contributions and earnings may also be withdrawn if the participant has five full years of employment with the Company. 4 1. Basis of presentation of significant accounting policies (continued) v. A participant may withdraw at any time any amount attributable to participant contributions and growth to purchase, prevent eviction from or foreclosure on, a principal residence or to pay certain expenses (namely post-secondary education and unreimbursed medical expenses). Withdrawals may not include earnings on 401(k) contributions posted to a participant's account after 1988. vi. No lump sum cash distribution in excess of $5,000 will be made without the consent of the participant. f. Daily for investment allocation changes made by participants. Participants should refer to the Plan document for a more complete description of the Plan's provisions. Realized gains and losses - The realized gains and losses recognized on the financial statements are calculated by comparing the sales proceeds to the original cost of the investment as prescribed by generally accepted accounting principles. The realized gains and losses recognized in the Form 5500 (annual federal filing) are recalculated by comparing the sales proceeds to the value of the investment at the beginning of the plan year. If the investment is purchased in the same year as the sale, the gain or loss is calculated by comparing the sales proceeds to the purchase price. 2. A. O. Smith Profit Sharing Retirement Master Trust The Plan assets are held in the A. O. Smith Profit Sharing Retirement Master Trust at the Marshall and Ilsley Trust Company. The Plan offers eight investment vehicles in which participants may invest their account balances. The amount of Master Trust assets, income and change in value which is allocated to the Plan is determined by the ratio of participant account balances in the Plan to the total participant account balances of all participating plans. The defined contribution plans participating in the Master Trust at December 31, 1998, are the A. O. Smith Profit Sharing Retirement Plan and the A. O. Smith Corporation Savings Plan. 5 2. A. O. Smith Profit Sharing Retirement Master Trust (continued) Significant information related to the investments in the Master Trust as of and for the year ended December 31, 1998, is as follows:
December 31, 1998 1998 Change 1998 Balance Income in Value --------------------- ------------------- ---------------------- a. Registered Investment Company Mutual Funds: American EuroPacific Growth Fund $ 3,143,960 $ 483,112 $ (164,779) * Firstar Growth and Income Fund 24,928,210 4,805,025 3,724,128 Fidelity Aggressive Equity Portfolio 54,809,424 13,350,136 6,005,498 Vanguard Institutional Index Trust Fund 22,594,131 4,849,448 6,801,280 Vanguard Fixed Income Short-term Corp. Fund 3,934,366 217,164 1,030,319 American Balanced Fund 9,752,324 954,398 917,960 --------------------- ------------------- ---------------------- Subtotal 119,162,415 24,659,283 18,314,406 --------------------- ------------------- ---------------------- b. Common/Collective Trusts: A. O. Smith Stock Fund 3,204,849 (553,467) 740,063 A. O. Smith Stable Asset Income Fund 60,173,052 3,050,555 29,558,769 --------------------- ------------------- ---------------------- Subtotal 63,377,901 2,497,088 30,298,832 --------------------- ------------------- ---------------------- c. Short-term, High quality liquid securities: A. O. Smith Income Fund - 269,178 (21,267,664) --------------------- ------------------- ---------------------- d. Cash (66,066) - (66,066) --------------------- ------------------- ---------------------- Total $ 182,474,250 $ 27,425,549 $ 27,279,508 ===================== =================== ======================
* Portico Growth & Income Fund became Firstar Growth & Income Fund during 1998. 2. A. O. Smith Profit Sharing Retirement Master Trust (continued) Significant information related to the investments in the Master Trust as of and for the year ended December 31, 1997, is as follows:
December 31, 1997 1997 Change 1997 Balance Income in Value --------------------- ------------------- ---------------------- a. Registered Investment Company Mutual Funds: American EuroPacific Growth Fund $ 3,308,738 $ 573,595 $ (3,791,930) Firstar Growth and Income Fund 21,204,082 6,717,437 (8,843,942) Fidelity Aggressive Equity Portfolio 48,803,925 16,690,296 (47,408,098) Vanguard Institutional Index Trust Fund 15,792,851 4,887,792 (5,881,172) Vanguard Fixed Income Short- term Corp. Fund 2,904,048 258,695 (4,536,895) American Balanced Fund 8,834,364 1,938,404 (7,312,409) --------------------- ------------------- ---------------------- Subtotal 100,848,008 31,066,219 (77,774,446) --------------------- ------------------- ---------------------- b. Common/Collective Trusts: A. O. Smith Stock Fund 2,464,786 698,209 1,415,710 A. O. Smith Stable Asset Income Fund 30,614,283 1,957,453 (19,415,303) --------------------- ------------------- ---------------------- Subtotal 33,079,069 2,655,662 (17,999,593) --------------------- ------------------- ---------------------- c. Short-term, High quality liquid securities: A. O. Smith Income Fund 21,267,665 1,554,005 (41,034,025) --------------------- ------------------- ---------------------- d. Cash 18,200 - 18,200 --------------------- ------------------- ---------------------- Total $155,212,942 $35,275,886 $(136,789,864) ===================== =================== ======================
At December 31, 1998 and 1997, the Plan was allocated 95.701% and 98.632%, respectively, of the Master Trust assets. 7 3. Investments Investments held by the Plan at December 31, are as follows:
1998 1997 -------------------------------------------- -------------------------------------------- Fair Fair Cost Value Cost Value -------------------- --------------------- --------------------- --------------------- Investments: A. O. Smith Profit Sharing Retirement Master Trust: Cash $ (49,218) $ (49,218) $ 15,086 $ 15,086 American EuroPacific Growth Fund 3,006,103 3,127,368 3,349,632 3,297,575 A. O. Smith Stock Fund 3,332,591 3,204,849 2,088,401 2,464,786 A. O. Smith Income Fund - - 19,703,210 19,703,210 (1) * Portico Growth and Income Fund 20,395,692 24,647,005 (1) 16,158,520 21,063,483 (1) Fidelity Aggressive Equity Portfolio 33,768,100 53,470,170 (1) 32,663,677 48,600,401 (1) Vanguard Institutional Index Trust Fund 16,256,965 20,901,926 (1) 12,342,664 15,704,496 (1) Vanguard Fixed Income Short-Term Corp. Fund 3,883,144 3,890,406 2,880,398 2,900,137 American Balanced Fund 8,848,245 8,955,555 (1) 8,465,120 8,780,279 (1) A. O. Smith Stable Asset Income Fund 53,791,788 56,495,726 (1) 28,485,483 30,560,560 (1) -------------------- --------------------- --------------------- --------------------- Total $ 143,233,410 $ 174,643,787 $ 126,152,191 $ 153,090,013 ==================== ===================== ===================== ===================== (1) - Investments representing at least 5% of the net assets available for benefits.
* Portico Growth & Income became Firstar Growth & Income during 1998. 8 3. Investments (continued) During 1998 and 1997, the Plan's investments appreciated (depreciated) in fair value by $4,472,555 and ($2,049,251), respectively as follows:
1998 1997 -------------------- ------------------- Investments: A. O. Smith Profit Sharing Retirement Master Trust: American EuroPacific Growth Fund $ 173,322 $ (301,107) A. O. Smith Stock Fund (504,126) 313,180 A. O. Smith Income Fund - - * Portico Growth and Income Fund (653,650) 1,778,512 Fidelity Aggressive Equity Portfolio 3,765,346 (4,419,766) Vanguard Institutional Index Trust Fund 1,283,129 858,203 Vanguard Fixed Income Short-Term Corp. Fund (12,477) 5,461 American Balanced Fund (207,849) (14,611) A. O. Smith Stable Asset Income Fund 628,860 (269,123) -------------------- ------------------- Total $ 4,472,555 $ (2,049,251) ==================== ===================
* Portico Growth & Income became Firstar Growth & Income during 1998. 9 3. Investments (continued) The Plan provides that contributions to the Plan will be invested in certain individual programs as directed by each participant. Amounts included in net assets and changes in net assets in the accompanying financial statements by investment programs at December 31, are as follows:
1998 ----------------------------------------------------------------------------------------- Investment Benefits at Fair Investment Paid to Value Income Contributions Participants -------------------- -------------------- -------------------- --------------------- Cash $ (49,218) $ - $ - $ - American EuroPacific Growth Fund 3,127,368 482,423 189,683 253,817 A. O. Smith Stock Fund 3,204,849 (553,467) 277,223 73,751 Vanguard Fixed Income Short-term Corp. Fund 3,890,406 216,358 167,740 193,184 Fidelity Aggressive Equity Portfolio 53,470,170 13,171,411 2,543,480 3,888,932 A. O. Smith Stable Asset Income Fund 56,495,726 2,921,622 1,862,533 5,968,503 Vanguard Institutional Index Trust Fund 20,901,926 4,647,343 1,003,064 1,461,287 A. O. Smith Income Fund - 280,150 1,104,132 652,870 American Balanced Fund 8,955,555 920,373 484,094 227,852 * Firstar Growth and Income Fund 24,647,005 4,768,616 1,215,825 1,382,025 -------------------- -------------------- -------------------- --------------------- Total $ 174,643,787 $ 26,854,829 $ 8,847,774 $ 14,102,221 ==================== ==================== ==================== =====================
* Portico Growth & Income Fund became Firstar Growth & Income Fund during 1998. 10 3. Investments (continued)
1997 ----------------------------------------------------------------------------------------- Investment Benefits at Fair Investment Income Paid to Value Contributions Participants -------------------- -------------------- -------------------- --------------------- Cash $ 15,086 $ - $ - $ - American EuroPacific Growth Fund 3,297,575 557,578 244,934 326,806 A. O. Smith Stock Fund 2,464,786 698,209 192,129 65,441 Vanguard Fixed Income Short-term Corp. Fund 2,900,137 251,680 183,497 570,706 Fidelity Aggressive Equity Portfolio 48,600,401 16,309,168 3,198,871 3,833,643 A. O. Smith Stable Asset Income Fund 30,560,560 1,941,677 1,439,489 3,822,278 Vanguard Institutional Index Trust Fund 15,704,496 4,798,346 1,023,585 560,106 A. O. Smith Income Fund 19,703,210 1,372,228 2,258,541 2,651,060 American Balanced Fund 8,780,279 1,868,376 604,442 897,757 Portico Growth and Income Fund 21,063,483 6,598,732 1,250,031 1,521,385 -------------------- -------------------- -------------------- --------------------- Total $ 153,090,013 $ 34,395,994 $ 10,395,519 $ 14,249,182 ==================== ==================== ==================== =====================
11 4. Income tax status The Plan obtained its latest determination letter on April 27, 1995, in which the Internal Revenue Service stated the Plan as then designed, was in compliance with the applicable requirements of the Internal Revenue Code. The Plan has been amended since receiving the determination letter. However, the Plan administrator and the Plan's tax counsel believe that the Plan is currently designed and being operated in compliance with the applicable requirements of the Internal Revenue Code. Therefore, no provision for income taxes has been included in the Plan's financial statements. 5. Plan termination While the Company has not expressed any intent to terminate the Plan, it is free to do so at any time. In the event of termination, each participant automatically becomes vested to the extent of the balance in his separate account. 6. Use of estimates The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts in the financial statements. Actual results could differ from those estimates. 7. Sale of a major division On April 18, 1997, A. O. Smith Corporation sold its Automotive Products Company to Tower Automotive. All account balances of the Automotive Products Company employees, which had been previously invested in the A. O. Smith Profit Sharing Retirement Master Trust, including in addition all accounts of the A. O. Smith Employee Savings Plan, the A. O. Smith Employee 401(k) Savings Plan, and the A. O. Smith Saving and Investment Plan, were transferred to Tower Automotive's defined contribution plan by September 30, 1997. 12


                                                                    EXHIBIT 23.1


CONSENT OF REILLY, PENNER & BENTON LLP


We consent to the incorporation by reference in the Registration Statement (Form
S-8 No. 333-05799)  pertaining to the A. O. Smith Profit Sharing Retirement Plan
(the Plan) of our report  dated June 24,  1999,  with  respect to the  financial
statements  and schedules of the Plan included in this Annual Report (Form 11-K)
for the year ended December 31, 1998.






  Milwaukee, Wisconsin                 REILLY, PENNER & BENTON LLP
  June 24, 1999



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