EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-104242) and Form S-8 (Nos. 2-56437, 2-91285, 33-20932, 33-30229, 33-91758, 33-27339, 333-41398, 333-88518, 333-57658, 333-112869 and 333-115333) of Barnes Group Inc. of our reports dated February 25, 2005 relating to the financial statements, financial statement schedule, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appear in this Annual Report on Form 10-K.

/s/    PRICEWATERHOUSECOOPERS LLP                      

PricewaterhouseCoopers LLP

Hartford, Connecticut

February 25, 2005