[LETTERHEAD OF MORRIS, NICHOLS, ARSHT & TUNNELL]


                                  June 10, 1996



Greenfield Capital Trust
c/o Greenfield Industries, Inc.
2743 Perimeter Parkway
Building 100, Suite 100
Augusta, Georgia  30909

                  Re:  Greenfield Capital Trust

Ladies and Gentlemen:

                  We have  acted  as  special  Delaware  counsel  to  Greenfield
Capital Trust, a Delaware statutory business trust (the "Trust"),  in connection
with certain  matters  relating to the  preparation of a Registration  Statement
(and the  Prospectus  forming a part  thereof)  on Form S-3 to be filed with the
Securities  and  Exchange   Commission  (the  "Commission")  by  the  Trust  and
Greenfield  Industries,  Inc.  (the  "Company") on or about the date hereof (the
"Registration  Statement"),  relating to the registration with the Commission of
the Preferred Securities of the Trust.

                  The Preferred  Securities  have been issued  pursuant to (i) a
Purchase  Agreement  dated April 18, 1996 (the  "Purchase  Agreement")  among CS
First Boston  Corporation,  as  representative  of the several  Purchasers  (the
"Representative"),  the Trust and the Company and (ii) the Amended and  Restated
Declaration  of Trust of the Trust  dated as of April 1,  1996  (the  "Governing
Instrument"). Capitalized terms used herein and not otherwise herein defined are
used as defined in the Governing Instrument.

                  In rendering  this  opinion,  we have examined and relied upon
copies of the following  documents in the forms provided to us: the  Certificate
of Trust of the Trust as filed in the  Office of the  Secretary  of State of the
State of Delaware (the "State Office") on December 7, 1995 (the  "Certificate");
a Declaration  of Trust of the Trust dated as of December 7, 1995 (the "Original
Governing  Instrument");  the Governing  Instrument;  the Forms and Specimens of
Preferred  Security and Common Security;  the Terms of Preferred  Securities and
Common  Securities;  the form of Indenture dated as of April 1, 1996 between the
Company and The Bank of New York, as


Trustee; the Preferred Securities Guarantee
Agreement by the Company and The Bank of New York, as Trustee, dated as of April
24, 1996; the Common Securities  Guarantee  Agreement by the Company dated as of
April 24, 1996; the Purchase  Agreement;  the Trust's  Confidential  Preliminary
Offering Circular dated April 3, 1996 relating to the Preferred Securities;  the
Trust's  Confidential  Offering  Circular  dated April 18, 1996  relating to the
Preferred  Securities  (the  "Offering   Circular");   the  Registration  Rights
Agreement   dated  April  24,  1996  among  the  Trust,   the  Company  and  the
Representative;  the Registration Statement;  and a certificate of good standing
of the  Trust  obtained  as of a recent  date  from the  State  Office.  In such
examinations,  we have assumed the genuineness of all signatures, the conformity
to original  documents of all  documents  submitted to us as drafts or copies or
forms of documents to be executed and the legal  capacity of natural  persons to
complete the  execution of  documents.  We have further  assumed for purposes of
this opinion:  (i) the due formation or  organization,  valid existence and good
standing  of each  entity  (other  than the Trust) that is a party to any of the
documents  reviewed by us under the laws of the  jurisdiction  of its respective
formation or organization;  (ii) the due  authorization,  execution and delivery
by,  or on  behalf  of,  each of the  parties  thereto  of the  above-referenced
documents (including,  without limitation, the due authorization,  execution and
delivery of the Governing  Instrument  and the Purchase  Agreement  prior to the
first  issuance  of  Preferred  Securities);  (iii)  that no event has  occurred
subsequent to the filing of the  Certificate  that would cause a dissolution  or
liquidation  of  the  Trust  under  the  Original  Governing  Instrument  or the
Governing Instrument, as applicable;  (iv) that the activities of the Trust have
been and will be conducted in accordance with the Original Governing  Instrument
or the Governing Instrument, as applicable, and the Delaware Business Trust Act,
12 Del. C. ss.ss.  3801 et seq. (the  "Delaware  Act");  (v) that each Holder of
Preferred Securities has made payment of the required consideration therefor and
received  a  Preferred  Securities   Certificate  in  consideration  thereof  in
accordance  with the terms  and  conditions  of the  Governing  Instrument,  the
Offering Circular and the Purchase Agreement; (vi) that the Preferred Securities
have  been  issued  and  sold to,  and held or  transferred  by,  the  Preferred
Securities Holders (and any subsequent transferee),  and all transfers have been
made, in accordance with the terms, conditions,  requirements and procedures set
forth in the  Governing  Instrument,  the  Offering  Circular  and the  Purchase
Agreement;  (vii)  none  of  the  Preferred  Securities  have  been  called  for
redemption,  redeemed,  converted  or  canceled  (except  in  connection  with a
permitted transfer) and all of the Preferred Securities remain outstanding;  and
(viii) that the documents  examined by us are in full force and effect,  express
the entire  understanding  of the parties  thereto  with  respect to the subject
matter thereof and have not been modified,  supplemented  or otherwise  amended,
except as herein  referenced.  No  opinion  is
                                       2


expressed  with  respect  to the
requirements  of, or compliance  with,  federal or state  securities or blue sky
laws. We have not participated in the preparation of the Registration  Statement
or any other  offering  materials  relating to the Preferred  Securities  and we
assume no  responsibility  for their  contents.  As to any fact  material to our
opinion,   other  than  those  assumed,   we  have  relied  without  independent
investigation  on the  above-referenced  documents and  certificates  and on the
accuracy, as of the date hereof, of the matters therein contained.

                  Based on and  subject  to the  foregoing,  and  limited in all
respects to matters of Delaware law, it is our opinion that:

                  1.  The  Trust  is  a  duly  organized  and  validly  existing
statutory  business  trust  in  good  standing  under  the  laws of the State of
Delaware.

                  2. The Preferred  Securities  constitute  validly  issued and,
subject to the  qualifications  set forth in  paragraph 3 below,  fully paid and
nonassessable beneficial interests in the Trust.

                  3.  Under  the  Delaware  Act and the  terms of the  Governing
Instrument,  each Preferred Security Holder of the Trust, in such capacity, will
be entitled to the same  limitation  of personal  liability as that  extended to
stockholders  of private  corporations  for profit  organized  under the General
Corporation  Law of the State of  Delaware;  provided,  however,  we  express no
opinion with respect to the liability of any Preferred  Security  Holder who is,
was or may become a named Trustee of the Trust.  Notwithstanding  the foregoing,
we note that pursuant to Section 11.04 of the  Governing  Instrument,  the Trust
may  withhold  amounts  otherwise  distributable  to a Holder  and pay over such
amounts to the applicable  jurisdictions  in accordance with federal,  state and
local law and any amount  withheld  will be deemed to have been  distributed  to
such Holder and that, pursuant to the Governing  Instrument,  Preferred Security
Holders may be obligated to make payments or provide indemnity or security under
the circumstances set forth therein.

                  We hereby  consent to the filing of this opinion as an exhibit
to the  Registration  Statement  and to the use of our name  under  the  heading
"Legal  Matters" in the  Prospectus.  In giving this consent,  we do not thereby
admit that we come  within the  category  of persons  whose  consent is required
under  Section 7 of the  Securities  Act of 1933,  as amended,  or the rules and
regulations  of the  Commission  thereunder.  This opinion speaks only as of the
date hereof and is based on our  understandings  and  assumptions  as to present
facts, and on our review of the  above-referenced  documents and the application
of Delaware  law as the same exist as of the date  hereof,  and we  undertake no
obligation  to update or
                                       3


supplement  this opinion after the date hereof for the
benefit of any person or entity with respect to any facts or circumstances  that
may  hereafter  come to our  attention  or any  changes in facts or law that may
hereafter occur or take effect.  This opinion is intended solely for the benefit
of the addressee hereof in connection with the matters  contemplated  hereby and
may not be  relied on by any  other  person  or entity or for any other  purpose
without our prior written consent.

                                            Very truly yours,

                                            /s/ MORRIS, NICHOLS, ARSHT & TUNNELL
                                       4