diff --git a/box/box.py b/box/box.py
index 8252643..235eeb8 100644
--- a/box/box.py
+++ b/box/box.py
@@ -1021,7 +1021,7 @@ def to_yaml(
             default_flow_style: bool = False,
             encoding: str = "utf-8",
             errors: str = "strict",
-            width: int = 120,
+            width: int = 0,
             **yaml_kwargs,
         ):
             """
@@ -1031,7 +1031,7 @@ def to_yaml(
             :param default_flow_style: False will recursively dump dicts
             :param encoding: File encoding
             :param errors: How to handle encoding errors
-            :param width: Line width for YAML output
+            :param width: Line width for YAML output (0 for no limit)
             :param yaml_kwargs: additional arguments to pass to yaml.dump
             :return: string of YAML (if no filename provided)
             """
@@ -1084,7 +1084,7 @@ def to_yaml(
             default_flow_style: bool = False,
             encoding: str = "utf-8",
             errors: str = "strict",
-            width: int = 120,
+            width: int = 0,
             **yaml_kwargs,
         ):
             raise BoxError('yaml is unavailable on this system, please install the "ruamel.yaml" or "PyYAML" package')
diff --git a/box/converters.py b/box/converters.py
index bb91ba6..db7adda 100644
--- a/box/converters.py
+++ b/box/converters.py
@@ -197,23 +197,24 @@ def _to_yaml(
     errors: str = "strict",
     ruamel_typ: str = "rt",
     ruamel_attrs: dict | None = None,
-    width: int = 120,
+    width: int = 0,
     **yaml_kwargs,
 ):
     if not ruamel_attrs:
         ruamel_attrs = {}
+    effective_width = width if width else None
     if filename:
         _exists(filename, create=True)
         with open(filename, "w", encoding=encoding, errors=errors) as f:
             if ruamel_available:
                 yaml_dumper = YAML(typ=ruamel_typ)
                 yaml_dumper.default_flow_style = default_flow_style
-                yaml_dumper.width = width
+                yaml_dumper.width = effective_width
                 for attr, value in ruamel_attrs.items():
                     setattr(yaml_dumper, attr, value)
                 return yaml_dumper.dump(obj, stream=f, **yaml_kwargs)
             elif pyyaml_available:
-                return yaml.dump(obj, stream=f, default_flow_style=default_flow_style, width=width, **yaml_kwargs)
+                return yaml.dump(obj, stream=f, default_flow_style=default_flow_style, width=effective_width, **yaml_kwargs)
             else:
                 raise BoxError(MISSING_PARSER_ERROR)
 
@@ -221,14 +222,14 @@ def _to_yaml(
         if ruamel_available:
             yaml_dumper = YAML(typ=ruamel_typ)
             yaml_dumper.default_flow_style = default_flow_style
-            yaml_dumper.width = width
+            yaml_dumper.width = effective_width
             for attr, value in ruamel_attrs.items():
                 setattr(yaml_dumper, attr, value)
             with StringIO() as string_stream:
                 yaml_dumper.dump(obj, stream=string_stream, **yaml_kwargs)
                 return string_stream.getvalue()
         elif pyyaml_available:
-            return yaml.dump(obj, default_flow_style=default_flow_style, width=width, **yaml_kwargs)
+            return yaml.dump(obj, default_flow_style=default_flow_style, width=effective_width, **yaml_kwargs)
         else:
             raise BoxError(MISSING_PARSER_ERROR)