UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

SCHEDULE 13G

(Under the Securities Exchange Act of 1934)
(Amendment No.)*

NATURAL GAS SERVICES GROUP
------------------------------------------------------
(Name of Issuer)

COMMON STOCK
--------------------------------------
(Title of Class of Securities)

63886Q109
-----------------------
(Cusip Number)

December 31, 2004
______________________________________
(Date of event which requires filing of this statement)

Check the appropriate box to designate the rule pursuant
to which this schedule is filed:

[X]  Rule 13d-1  (b)
[ ]  Rule 13d-1  (c)
[ ]  Rule 13d-1  (d)

*The remainder of this cover page shall be filled out for a
reporting person's initial filing of this form with respect to the
subject class of securities, and for any subsequent amendment
containing information which would alter the disclosures provided in
a prior cover page.

The information required in the remainder of this cover page shall
not be deemed to be "filed" for the purpose of Section 18 of the
Securities Exchange Act of 1934 ("Act") or otherwise subject to the
liabilities of that section of the Act, but shall be subject to all
other provisions of the Act (however, see the Notes.)

[Continued on the following page(s)]
Page 1 of 4 Pages

CUSIP No. 63886Q109  	2 of 4 Pages
----------------------------------------------------------------
1.	Name of reporting person
 	S.S. or I.R.S. identification no. of above person

	Babson Capital Management LLC
	51-0504477


2.	Check the appropriate box if a member of a group
	(a)(   )
	(b)( X )
----------------------------------------------------------------
3.	SEC use only

----------------------------------------------------------------
4.	Citizenship or place of organization
	Delaware
----------------------------------------------------------------

Number of shares beneficially owned by each reporting person with

5.  Sole Voting Power


      641,400
___________________

6.  Shared Voting Power

       10,300
__________________________

7.  Sole Dispositive Power

      651,700
_______________________________

8.	Shared Dispositive Power
	      0
 ---------------------------------------------------------------
9.	Aggregate amount beneficially owned by each reporting person

       651,700
---------------------------------------------------------------
10.	Check if the aggregate amount in row (9) excludes certain shares*

----------------------------------------------------------------

11. Percent of class represented by amount in row 9.

        10.74%
----------------------------------------------------------------

12.	Type of Reporting person
	IA











Page 3 of 4 Pages 					Cusip #: 63886Q109

SCHEDULE 13G


ITEM 1(A):  NAME OF ISSUER:

NATURAL GAS SERVICES GROUP


1(B):  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

2911 SCR 1260
Midland, TX   79706

ITEM 2(A):  NAME OF PERSON FILING:

Babson Capital Management LLC (Babson Capital)

ITEM 2(B):  ADDRESS OF PRINCIPAL BUSINESS OFFICE:

One Memorial Drive
Cambridge, Massachusetts  02142-1300

ITEM 2(C):  CITIZENSHIP:

See Item 4 of Cover Page

ITEM 2(D):  TITLE OF CLASS OF SECURITIES:

See Cover Page

ITEM 2(E):  CUSIP NUMBER:

See Cover Page

ITEM 3:  TYPE OF REPORTING PERSON:

If this statement is filed pursuant to Sections 240.13d-1 (b)
or 240.13d-2 (b) or (c), check whether the filing person is a:

(e) [x]  An investment adviser in accordance with
         Section 240.13d-1 (b) (1) (ii) (E)

ITEM 4:  OWNERSHIP:

(a)	AMOUNT BENEFICIALLY OWNED:  Babson Capital,in its capacity as
investment adviser, may be deemed the beneficial owner of 651,700
shares of common stock of the Issuer which are owned by investment
advisory client(s).

(b)	PERCENT OF CLASS:  10.74%




(c)	For information on voting and dispositive power with respect to the
above listed shares, see Items 5 - 8 of Cover Page.

Page 4 of 4 Pages				Cusip #:63886Q109

ITEM 5:  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

N/A

ITEM 6:  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

N/A

ITEM 7: IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

Not Applicable

ITEM 8:  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

Not Applicable

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 statement
is true, complete and correct.


		Date: February 8, 2005






		Signature:  --//Leslie A. Meinhart//--
		Name/Title:     LESLIE A. MEINHART
             		    Compliance Manager





February 8, 2005

Securities and Exchange Commission
Operations Center
Attn:  Stop 0-7
6432 General Green Way
Alexandria, VA 22312-2413


Re:	SCHEDULE 13G RELATING TO COMMON STOCK OF NATURAL GAS
      SERVICES GROUP FOR THE YEAR ENDING DECEMBER 31, 2004


Dear Sir or Madam:

Babson Capital Management LLC is filing today an initial Schedule
13G through the EDGAR system as required by Section 240.13d-1(b)
to reflect beneficial ownership of greater than 5% of the
outstanding stock of the above-mentioned issuer.

Please note that the shares as to which this Schedule is filed are
owned by various investment advisory clients of Babson Capital,
which may be deemed a beneficial owner of the shares only by virtue
of the direct or indirect investment discretion it possesses pursuant
to the provisions of investment advisory agreements with such clients.

A copy of the Schedule 13G is being sent to the issuer as required by
Rule 13d-7.

Comments or questions concerning the above may be directed to the
undersigned at (617) 761-3798.

Sincerely,



// Leslie A. Meinhart //
   LESLIE A. MEINHART
   Compliance Manager