diff --git a/scrapy/pipelines/files.py b/scrapy/pipelines/files.py
index b1b8404bb..338286092 100644
--- a/scrapy/pipelines/files.py
+++ b/scrapy/pipelines/files.py
@@ -213,14 +213,11 @@ class FilesPipeline(MediaPipeline):
     """
 
     MEDIA_NAME = "file"
-    EXPIRES = 90
     STORE_SCHEMES = {
         '': FSFilesStore,
         'file': FSFilesStore,
         's3': S3FilesStore,
     }
-    DEFAULT_FILES_URLS_FIELD = 'file_urls'
-    DEFAULT_FILES_RESULT_FIELD = 'files'
 
     def __init__(self, store_uri, download_func=None):
         if not store_uri:
@@ -235,9 +232,9 @@ class FilesPipeline(MediaPipeline):
         s3store.AWS_SECRET_ACCESS_KEY = settings['AWS_SECRET_ACCESS_KEY']
         s3store.POLICY = settings['FILES_STORE_S3_ACL']
 
-        cls.FILES_URLS_FIELD = settings.get('FILES_URLS_FIELD', cls.DEFAULT_FILES_URLS_FIELD)
-        cls.FILES_RESULT_FIELD = settings.get('FILES_RESULT_FIELD', cls.DEFAULT_FILES_RESULT_FIELD)
-        cls.EXPIRES = settings.getint('FILES_EXPIRES', 90)
+        cls.FILES_URLS_FIELD = settings.get('FILES_URLS_FIELD')
+        cls.FILES_RESULT_FIELD = settings.get('FILES_RESULT_FIELD')
+        cls.EXPIRES = settings.getint('FILES_EXPIRES')
         store_uri = settings['FILES_STORE']
         return cls(store_uri)
 
diff --git a/scrapy/pipelines/images.py b/scrapy/pipelines/images.py
index ff73b44b7..1f6b0c7e7 100644
--- a/scrapy/pipelines/images.py
+++ b/scrapy/pipelines/images.py
@@ -36,24 +36,19 @@ class ImagesPipeline(FilesPipeline):
     """
 
     MEDIA_NAME = 'image'
-    MIN_WIDTH = 0
-    MIN_HEIGHT = 0
-    THUMBS = {}
-    DEFAULT_IMAGES_URLS_FIELD = 'image_urls'
-    DEFAULT_IMAGES_RESULT_FIELD = 'images'
 
     @classmethod
     def from_settings(cls, settings):
-        cls.MIN_WIDTH = settings.getint('IMAGES_MIN_WIDTH', 0)
-        cls.MIN_HEIGHT = settings.getint('IMAGES_MIN_HEIGHT', 0)
-        cls.EXPIRES = settings.getint('IMAGES_EXPIRES', 90)
-        cls.THUMBS = settings.get('IMAGES_THUMBS', {})
+        cls.MIN_WIDTH = settings.getint('IMAGES_MIN_WIDTH')
+        cls.MIN_HEIGHT = settings.getint('IMAGES_MIN_HEIGHT')
+        cls.EXPIRES = settings.getint('IMAGES_EXPIRES')
+        cls.THUMBS = settings.get('IMAGES_THUMBS')
         s3store = cls.STORE_SCHEMES['s3']
         s3store.AWS_ACCESS_KEY_ID = settings['AWS_ACCESS_KEY_ID']
         s3store.AWS_SECRET_ACCESS_KEY = settings['AWS_SECRET_ACCESS_KEY']
 
-        cls.IMAGES_URLS_FIELD = settings.get('IMAGES_URLS_FIELD', cls.DEFAULT_IMAGES_URLS_FIELD)
-        cls.IMAGES_RESULT_FIELD = settings.get('IMAGES_RESULT_FIELD', cls.DEFAULT_IMAGES_RESULT_FIELD)
+        cls.IMAGES_URLS_FIELD = settings.get('IMAGES_URLS_FIELD')
+        cls.IMAGES_RESULT_FIELD = settings.get('IMAGES_RESULT_FIELD')
         store_uri = settings['IMAGES_STORE']
         return cls(store_uri)
 
diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index d449c4891..843506741 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -159,6 +159,9 @@ FEED_EXPORTERS_BASE = {
 }
 
 FILES_STORE_S3_ACL = 'private'
+FILES_EXPIRES = 90
+FILES_URLS_FIELD = 'file_urls'
+FILES_RESULT_FIELD = 'files'
 
 HTTPCACHE_ENABLED = False
 HTTPCACHE_DIR = 'httpcache'
@@ -175,6 +178,13 @@ HTTPCACHE_GZIP = False
 
 HTTPPROXY_AUTH_ENCODING = 'latin-1'
 
+IMAGES_MIN_WIDTH = 0
+IMAGES_MIN_HEIGHT = 0
+IMAGES_EXPIRES = 90
+IMAGES_THUMBS = {}
+IMAGES_URLS_FIELD = 'image_urls'
+IMAGES_RESULT_FIELD = 'images'
+
 ITEM_PROCESSOR = 'scrapy.pipelines.ItemPipelineManager'
 
 ITEM_PIPELINES = {}