UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 22, 2013

Colfax Corporation

(Exact name of registrant as specified in its charter)

8170 Maple Lawn Boulevard, Suite 180

Fulton, MD 20759

(Address of Principal Executive Offices) (Zip Code)

(301) 323-9000

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 1.01. Entry into a Material Definitive Agreement.

On February 22, 2013, Colfax Corporation (the “Company”) entered into the Second Amendment to its credit agreement, as amended, by and among the Company, Colfax UK Holdings Ltd, the other subsidiaries of the Company party thereto, the lenders party thereto and Deutsche Bank AG New York Branch, as administrative agent (the “Second Amendment”). Pursuant to the Second Amendment, the Company amended its credit agreement to, among other things, (i) reallocate the borrowing capacities of the tranches of loans as follows: a $408.7 million term A-1 facility, a $380 million term A-2 facility, a €157.6 million term A-3 facility, a €105.3 million term A-4 facility, a $400 million term B facility and two revolving credit subfacilities which total $500 million in commitments, (ii) provide for an interest rate margin on the term A-1 facility, the term A-2 facility and the revolving credit subfacilities ranging from 0.75% to 1.50% per annum for base rate loans and 1.75% to 2.50% per annum for Eurocurrency rate loans, in each case, determined by the Company’s leverage ratio, (iii) provide for an interest rate margin on the term A-3 facility and the term A-4 facility ranging from 1.50% to 2.25% per annum for base rate loans and 2.50% to 3.25% per annum for Eurocurrency rate loans, in each case, determined by the Company’s leverage ratio and (iv) provide for an interest rate margin on the term B facility of 1.50% per annum for base rate loans and 2.50% per annum for Eurocurrency rate loans. Other amendments and modifications are more fully set forth in the full text of the Second Amendment.

The foregoing description of the Second Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Second Amendment, which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX