SCHEDULE 13G 

Amendment No. 3  
CompX International Incorporated  
Class A Common Stock  
Cusip # 20563P101                 

Cusip # 20563P101            
Item 1:Reporting Person - FMR Corp. 
Item 4:Commonwealth of Massachusetts 
Item 5:217,700  
Item 6:0  
Item 7:785,266  
Item 8:0  
Item 9:785,266  
Item 11:12.77%  
Item 12:    HC 

Cusip # 20563P101     
Item 1:Reporting Person - Edward C. Johnson 3d  
Item 4:United States of America 
Item 5:0  
Item 6:0  
Item 7:785,266  
Item 8:0  
Item 9:785,266  
Item 11:12.77%  
Item 12:IN  

Cusip # 20563P101       
Item 1:Reporting Person - Abigail P. Johnson  
Item 4:United States of America 
Item 5:None  
Item 6:None  
Item 7:785,266  
Item 8:None  
Item 9:785,266  
Item 11:12.77%  
Item 12:    IN 

SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 

Item 1(a).Name of Issuer: 

CompX International Incorporated  

Item 1(b).Name of Issuer's Principal Executive Offices: 

200 Old Mill Road 
Mauldin, SC 29662   

Item 2(a).Name of Person Filing:  

FMR Corp. 

Item 2(b).Address or Principal Business Office or, if None,  
Residence: 

82 Devonshire Street, Boston, Massachusetts  02109 

Item 2(c).Citizenship: 

Not applicable 

Item 2(d).Title of Class of Securities: 

Class A Common Stock  

Item 2(e).CUSIP Number:   

20563P101  

Item 3.This statement is filed pursuant to Rule 13d-1(b) or 13d- 
2(b) and the person filing, FMR Corp., is a parent  
holding company in accordance with Section 240.13d- 
1(b)(ii)(G).  (Note:  See Item 7). 

Item 4.Ownership 

(a)Amount Beneficially Owned: 
785,266  

(b)Percent of Class: 
12.77%  

(c)Number of shares as to which such person has:   

(i)sole power to vote or to direct the vote: 
217,700  

(ii)shared power to vote or to direct the vote: 
0  

(iii)sole power to dispose or to direct the  
disposition of:785,266  

(iv)shared power to dispose or to direct the  
disposition of:0  

Item 5.Ownership of Five Percent or Less of a CommonStock. 

Not applicable. 

Item 6.Ownership of More than Five Percent on Behalf of Another  
Person. 

Various persons have the right to receive or the  
power to direct the receipt of dividends from, or  
the proceeds from the sale of, the Class A Common  
Stock of CompX International Incorporated.  No one  
person's interest in the Class A Common Stock of  
CompX International Incorporated is more than five  
percent of the total outstanding Class A Common  
Stock. 

Item 7.Identification and Classification of the Subsidiary Which  
Acquired the Security Being Reported on By the Parent  
Holding Company. 

See attached Exhibit(s) A, B.  

Item 8.Identification and Classification of Members of the  
Group. 

Not Applicable. See attached Exhibit A.  

Item 9.Notice of Dissolution of Group. 

Not applicable. 

Item 10.Certification. 

By signing below I certify that, to the best of my  
knowledge and belief, the securities referred to  
above were acquired in the ordinary course of  
business and were not acquired for the purpose of  
and do not have the effect of changing or  
influencing the control of the issuer of such  
securities and were not acquired in connection with  
or as a participant in any transaction having such  
purpose or effect. 

Signature 

After reasonable inquiry and to the best of my  
knowledge and belief, I certify that the information  
set forth in this Schedule 13G in connection with  
FMR Corp.'s beneficial ownership of the Class A  
Common Stock of CompX International Incorporated at  
December 31, 1999 is true, complete and correct.  

February 14, 2000  
Date 

/s/Eric D. Roiter 
Signature 

Eric D. Roiter 
Duly authorized under  
Power of Attorney 
dated December 30, 1997,  
by and on behalf 
of FMR Corp. and its  
direct and indirect 
subsidiaries 

SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 

Pursuant to the instructions in Item 7 of Schedule 13G,  
Fidelity Management & Research Company ("Fidelity"), 82  
Devonshire Street, Boston, Massachusetts 02109, a wholly-owned  
subsidiary of FMR Corp. and an investment adviser registered  
under Section 203 of the Investment Advisers Act of 1940, is the  
beneficial owner of 567,566 shares or 9.23% of the Class A Common  
Stock outstanding of CompX International Incorporated  ("the  
Company") as a result of acting as investment adviser to various  
investment companies registered under Section 8 of the Investment  
Company Act of 1940. 

Edward C. Johnson 3d, FMR Corp., through its control of  
Fidelity, and the funds each has sole power to dispose of the  
567,566 shares owned by the Funds. 

Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR  
Corp., has the sole power to vote or direct the voting of the  
shares owned directly by the Fidelity Funds, which power resides  
with the Funds' Boards of Trustees.  Fidelity carries out the  
voting of the shares under written guidelines established by the  
Funds' Boards of Trustees. 

Fidelity Management Trust Company, 82 Devonshire Street,  
Boston, Massachusetts 02109, a wholly-owned subsidiary of FMR  
Corp. and a bank as defined in Section 3(a)(6) of the Securities  
Exchange Act of 1934, is the beneficial owner of 217,700 shares  
or 3.54% of the Class A Common Stock outstanding of the Company  
as a result of its serving as investment manager of the  
institutional account(s).  

Edward C. Johnson 3d and FMR Corp., through its control of  
Fidelity Management Trust Company, each has sole dispositive  
power over 217,700 shares and sole power to vote or to direct the  
voting of 217,700 shares of Class A Common Stock owned by the  
institutional account(s) as reported above. 

Strategic Advisers, Inc., 82 Devonshire Street, Boston, MA  
02109, a wholly-owned subsidiary of FMR Corp. and an investment  
adviser registered under Section 203 of the Investment Advisers  
Act of 1940, provides investment advisory services to  
individuals. It does not have sole power to vote or direct the  
voting of shares of certain securities held for clients and has  
sole dispositive power over such securities. As such, FMR Corp.'s  
beneficial ownership may include shares beneficially owned  
through Strategic Advisers, Inc. 

Members of the Edward C. Johnson 3d family are the  
predominant owners of Class B shares of common stock of FMR  
Corp., representing approximately 49% of the voting power of FMR  
Corp.  Mr. Johnson 3d owns 12.0% and Abigail Johnson owns 24.5%  
of the aggregate outstanding voting stock of FMR Corp.  Mr.  
Johnson 3d is Chairman of FMR Corp. and Abigail P. Johnson is a  
Director of FMR Corp.  The Johnson family group and all other  
Class B shareholders have entered into a shareholders' voting  
agreement under which all Class B shares will be voted in  
accordance with the majority vote of Class B shares.   
Accordingly, through their ownership of voting common stock and  
the execution of the shareholders' voting agreement, members of  
the Johnson family may be deemed, under the Investment Company  
Act of 1940, to form a controlling group with respect to FMR  
Corp. 

. 

SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS 
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) 
RULE 13d-1(f)(1)  AGREEMENT 

The undersigned persons, on February 14, 2000, agree and  
consent to the joint filing on their behalf of this Schedule 13G  
in connection with their beneficial ownership of the Class A  
Common Stock of CompX International Incorporated at December 31,  
1999. 

FMR Corp. 

By   /s/Eric D. Roiter    
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by and on  
behalf 
of FMR Corp. and its direct and  
indirect  
subsidiaries 

Edward C. Johnson 3d 

By   /s/Eric D. Roiter    
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by and on  
behalf 
of Edward C. Johnson 3d 

Abigail P. Johnson 

By   /s/Eric D. Roiter    
Eric D. Roiter 
Duly authorized under Power of  
Attorney 
dated December 30, 1997, by and on  
behalf 
of Abigail P. Johnson 

Fidelity Management & Research  
Company 

By   /s/Eric D. Roiter    
Eric D. Roiter 
Senior V.P. and General Counsel