diff --git a/api/src/opentrons/hardware_control/instruments/ot3/instrument_calibration.py b/api/src/opentrons/hardware_control/instruments/ot3/instrument_calibration.py
index d7f6926ea80..c5fe989c2dd 100644
--- a/api/src/opentrons/hardware_control/instruments/ot3/instrument_calibration.py
+++ b/api/src/opentrons/hardware_control/instruments/ot3/instrument_calibration.py
@@ -10,10 +10,12 @@
 from opentrons.types import Point, Mount
 
 # TODO change this when imports are fixed
-from opentrons.calibration_storage.ot3.pipette_offset import save_pipette_calibration
+from opentrons.calibration_storage.ot3.pipette_offset import (
+    save_pipette_calibration,
+    get_pipette_offset,
+)
 from opentrons.calibration_storage import (
     types as cal_top_types,
-    get_pipette_offset,
     ot3_gripper_offset,
 )
 from opentrons.hardware_control.types import OT3Mount
diff --git a/robot-server/robot_server/hardware.py b/robot-server/robot_server/hardware.py
index faaf63ce959..5c0deb148be 100644
--- a/robot-server/robot_server/hardware.py
+++ b/robot-server/robot_server/hardware.py
@@ -26,7 +26,7 @@
     feature_flags as ff,
 )
 from opentrons.util.helpers import utc_now
-from opentrons.hardware_control import ThreadManagedHardware, HardwareControlAPI
+from opentrons.hardware_control import ThreadManagedHardware, HardwareControlAPI, API
 from opentrons.hardware_control.simulator_setup import load_simulator_thread_manager
 from opentrons.hardware_control.types import (
     HardwareEvent,
@@ -50,6 +50,7 @@
 )
 from .errors.robot_errors import (
     NotSupportedOnOT2,
+    NotSupportedOnFlex,
     HardwareNotYetInitialized,
     HardwareFailedToInitialize,
 )
@@ -226,6 +227,17 @@ def get_ot3_hardware(
     return cast(OT3API, thread_manager.wrapped())
 
 
+def get_ot2_hardware(
+    thread_manager: ThreadManagedHardware = Depends(get_thread_manager),
+) -> "API":
+    """Get an OT2 hardware controller."""
+    if not thread_manager.wraps_instance(API):
+        raise NotSupportedOnFlex(
+            detail="This route is only available on an OT-2."
+        ).as_error(status.HTTP_403_FORBIDDEN)
+    return cast(API, thread_manager.wrapped())
+
+
 async def get_firmware_update_manager(
     app_state: AppState = Depends(get_app_state),
     thread_manager: ThreadManagedHardware = Depends(get_thread_manager),
diff --git a/robot-server/robot_server/service/pipette_offset/router.py b/robot-server/robot_server/service/pipette_offset/router.py
index c6e04dc2a45..e3229a0c3e7 100644
--- a/robot-server/robot_server/service/pipette_offset/router.py
+++ b/robot-server/robot_server/service/pipette_offset/router.py
@@ -1,15 +1,18 @@
 from starlette import status
-from fastapi import APIRouter
+from fastapi import APIRouter, Depends
 from typing import Optional
 
 from opentrons import types as ot_types
 from opentrons.calibration_storage.ot2 import pipette_offset, models
 
+from robot_server.hardware import get_ot2_hardware
 from robot_server.errors import ErrorBody
 from robot_server.service.pipette_offset import models as pip_models
 from robot_server.service.errors import RobotServerError, CommonErrorDef
 from robot_server.service.shared_models import calibration as cal_model
 
+from opentrons.hardware_control import API
+
 router = APIRouter()
 
 
@@ -45,7 +48,9 @@ def _format_calibration(
     response_model=pip_models.MultipleCalibrationsResponse,
 )
 async def get_all_pipette_offset_calibrations(
-    pipette_id: Optional[str] = None, mount: Optional[pip_models.MountType] = None
+    pipette_id: Optional[str] = None,
+    mount: Optional[pip_models.MountType] = None,
+    _: API = Depends(get_ot2_hardware),
 ) -> pip_models.MultipleCalibrationsResponse:
 
     all_calibrations = pipette_offset.get_all_pipette_offset_calibrations()
@@ -75,7 +80,7 @@ async def get_all_pipette_offset_calibrations(
     responses={status.HTTP_404_NOT_FOUND: {"model": ErrorBody}},
 )
 async def delete_specific_pipette_offset_calibration(
-    pipette_id: str, mount: pip_models.MountType
+    pipette_id: str, mount: pip_models.MountType, _: API = Depends(get_ot2_hardware)
 ):
     try:
         pipette_offset.delete_pipette_offset_file(
diff --git a/robot-server/robot_server/service/tip_length/router.py b/robot-server/robot_server/service/tip_length/router.py
index d79973039d6..2d6461e0b7f 100644
--- a/robot-server/robot_server/service/tip_length/router.py
+++ b/robot-server/robot_server/service/tip_length/router.py
@@ -1,15 +1,18 @@
 from starlette import status
-from fastapi import APIRouter
+from fastapi import APIRouter, Depends
 from typing import Optional
 
 from opentrons.calibration_storage import types as cal_types
 from opentrons.calibration_storage.ot2 import tip_length, models
 
+from robot_server.hardware import get_ot2_hardware
 from robot_server.errors import ErrorBody
 from robot_server.service.tip_length import models as tl_models
 from robot_server.service.errors import RobotServerError, CommonErrorDef
 from robot_server.service.shared_models import calibration as cal_model
 
+from opentrons.hardware_control import API
+
 
 router = APIRouter()
 
@@ -48,6 +51,7 @@ async def get_all_tip_length_calibrations(
     tiprack_hash: Optional[str] = None,
     pipette_id: Optional[str] = None,
     tiprack_uri: Optional[str] = None,
+    _: API = Depends(get_ot2_hardware),
 ) -> tl_models.MultipleCalibrationsResponse:
     all_calibrations = tip_length.get_all_tip_length_calibrations()
     if not all_calibrations:
@@ -79,7 +83,9 @@ async def get_all_tip_length_calibrations(
     "serial and tiprack hash",
     responses={status.HTTP_404_NOT_FOUND: {"model": ErrorBody}},
 )
-async def delete_specific_tip_length_calibration(tiprack_hash: str, pipette_id: str):
+async def delete_specific_tip_length_calibration(
+    tiprack_hash: str, pipette_id: str, _: API = Depends(get_ot2_hardware)
+):
     try:
         tip_length.delete_tip_length_calibration(tiprack_hash, pipette_id)
     except cal_types.TipLengthCalNotFound:
diff --git a/robot-server/tests/conftest.py b/robot-server/tests/conftest.py
index 1e30fb7c4a6..a414541f45f 100644
--- a/robot-server/tests/conftest.py
+++ b/robot-server/tests/conftest.py
@@ -30,7 +30,7 @@
 from opentrons.types import Point, Mount
 
 from robot_server import app
-from robot_server.hardware import get_hardware
+from robot_server.hardware import get_hardware, get_ot2_hardware
 from robot_server.versioning import API_VERSION_HEADER, LATEST_API_VERSION_HEADER_VALUE
 from robot_server.service.session.manager import SessionManager
 from robot_server.persistence import get_sql_engine, create_sql_engine
@@ -139,11 +139,23 @@ async def get_version_override() -> ComponentVersions:
     del app.dependency_overrides[get_versions]
 
 
+@pytest.fixture
+def _override_ot2_hardware_with_mock(hardware: MagicMock) -> Iterator[None]:
+    async def get_ot2_hardware_override() -> API:
+        """Override for the get_ot2_hardware FastAPI dependency."""
+        return MagicMock(spec=API)
+
+    app.dependency_overrides[get_ot2_hardware] = get_ot2_hardware_override
+    yield
+    del app.dependency_overrides[get_ot2_hardware]
+
+
 @pytest.fixture
 def api_client(
     _override_hardware_with_mock: None,
     _override_sql_engine_with_mock: None,
     _override_version_with_mock: None,
+    _override_ot2_hardware_with_mock: None,
 ) -> TestClient:
     client = TestClient(app)
     client.headers.update({API_VERSION_HEADER: LATEST_API_VERSION_HEADER_VALUE})
diff --git a/robot-server/tests/integration/test_pipette_offset_access.tavern.yaml b/robot-server/tests/integration/test_pipette_offset_access.tavern.yaml
index 4145c682740..ccf961aa06d 100644
--- a/robot-server/tests/integration/test_pipette_offset_access.tavern.yaml
+++ b/robot-server/tests/integration/test_pipette_offset_access.tavern.yaml
@@ -124,3 +124,26 @@ stages:
         mount: 'right'
     response:
         status_code: 200
+
+---
+test_name: Pipette calibrations inaccessible on flex
+marks:
+  - usefixtures:
+    - ot3_server_base_url
+    - set_up_pipette_offset_temp_directory
+stages:
+  - name: GET request 403s
+    request:
+      url: "{ot3_server_base_url}/calibration/pipette_offset"
+      method: GET
+    response:
+      status_code: 403
+  - name: DELETE request 403s
+    request:
+      url: "{ot3_server_base_url}/calibration/pipette_offset"
+      method: DELETE
+      params:
+        pipette_id: '321'
+        mount: 'right'
+    response:
+        status_code: 403
diff --git a/robot-server/tests/integration/test_tip_length_access.tavern.yaml b/robot-server/tests/integration/test_tip_length_access.tavern.yaml
index d8d2f009485..9b181e0877a 100644
--- a/robot-server/tests/integration/test_tip_length_access.tavern.yaml
+++ b/robot-server/tests/integration/test_tip_length_access.tavern.yaml
@@ -159,3 +159,22 @@ stages:
       method: DELETE
     response:
         status_code: 404
+---
+test_name: Tip length inaccessible on flex
+marks:
+  - ot3_only
+  - usefixtures:
+    - ot3_server_base_url
+stages:
+  - name: GET request 403s
+    request:
+      url: "{ot3_server_base_url}/calibration/tip_length"
+      method: GET
+    response:
+      status_code: 403
+  - name: DELETE request 403s
+    request:
+      url: "{ot3_server_base_url}/calibration/tip_length"
+      method: DELETE
+    response:
+        status_code: 403