diff --git a/trytond/model/fields/__init__.py b/trytond/model/fields/__init__.py
index 529b3e9451..bbb52c3855 100644
--- a/trytond/model/fields/__init__.py
+++ b/trytond/model/fields/__init__.py
@@ -5,7 +5,6 @@ from .field import *
 from .boolean import *
 from .integer import *
 from .char import *
-from .sha import *
 from .text import *
 from .float import *
 from .numeric import *
diff --git a/trytond/model/fields/sha.py b/trytond/model/fields/sha.py
deleted file mode 100644
index 2df89d3ea6..0000000000
--- a/trytond/model/fields/sha.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# This file is part of Tryton.  The COPYRIGHT file at the top level of
-# this repository contains the full copyright notices and license terms.
-import hashlib
-from sql import Query, Expression
-
-from ... import backend
-from .field import SQLType
-from .char import Char
-
-
-class Sha(Char):
-    '''
-    Define a sha field (``unicode``) of len 40.
-    '''
-    _type = 'sha'
-
-    def sql_format(self, value):
-        if value is not None and not isinstance(value, (Query, Expression)):
-            if isinstance(value, unicode):
-                value = value.encode('utf-8')
-            value = hashlib.sha1(value).hexdigest()
-        return super(Sha, self).sql_format(value)
-
-    def sql_type(self):
-        db_type = backend.name()
-        if db_type == 'mysql':
-            return SQLType('CHAR', 'VARCHAR(40)')
-        return SQLType('VARCHAR', 'VARCHAR(40)')