diff --git a/features/fedramp_extensions.feature b/features/fedramp_extensions.feature
index 45e828a81..873957004 100644
--- a/features/fedramp_extensions.feature
+++ b/features/fedramp_extensions.feature
@@ -121,6 +121,7 @@ Examples:
   | interconnection-security |
   | inventory-item-allows-authenticated-scan |
   | inventory-item-and-component-has-public |
+  | inventory-item-has-hardware-model |
   | inventory-item-has-valid-mac-address |
   | inventory-item-has-vendor-name |
   | inventory-item-or-component-has-asset-id |
@@ -376,6 +377,8 @@ Examples:
   | inventory-item-allows-authenticated-scan-PASS.yaml |
   | inventory-item-and-component-has-public-FAIL.yaml |
   | inventory-item-and-component-has-public-PASS.yaml |
+  | inventory-item-has-hardware-model-FAIL.yaml |
+  | inventory-item-has-hardware-model-PASS.yaml |
   | inventory-item-has-valid-mac-address-FAIL.yaml |
   | inventory-item-has-valid-mac-address-PASS.yaml |
   | inventory-item-has-vendor-name-FAIL.yaml |
diff --git a/src/content/rev5/examples/ssp/xml/fedramp-ssp-example.oscal.xml b/src/content/rev5/examples/ssp/xml/fedramp-ssp-example.oscal.xml
index e70c03786..24e254cfe 100644
--- a/src/content/rev5/examples/ssp/xml/fedramp-ssp-example.oscal.xml
+++ b/src/content/rev5/examples/ssp/xml/fedramp-ssp-example.oscal.xml
@@ -2305,6 +2305,7 @@ approved.</p>
       <description>
         <p>Legacy Example (No implemented-component).</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-01"/>
       <prop name="ipv4-address" value="10.1.1.1"/>
       <prop name="ipv6-address" value="2001:db8:3333:4444:5555:6666:7777:8888"/>
@@ -2359,6 +2360,7 @@ approved.</p>
       <description>
         <p>Component Inventory Example</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-02"/>
       <prop name="ipv4-address" value="10.2.2.2"/>
       <prop name="ipv6-address" value="0000:0000:0000:0000:0000:ffff:0a02:0202"/>
@@ -2398,6 +2400,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-03"/>
       <prop name="asset-type" value="web-server"/>
       <prop name="virtual" value="yes"/>
@@ -2414,6 +2417,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-04"/>
       <prop name="asset-type" value="appliance"/>
       <prop name="virtual" value="yes"/>
@@ -2429,6 +2433,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-05"/>
       <prop name="asset-type" value="firewall"/>
       <prop name="ipv4-address" value="10.5.5.5"/>
@@ -2444,6 +2449,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-06"/>
       <prop name="ipv4-address" value="10.6.6.6"/>
       <prop name="ipv6-address" value="0000:0000:0000:0000:0000:ffff:0a06:0606"/>
@@ -2462,6 +2468,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-07"/>
       <prop name="asset-type" value="switch"/>
       <prop name="ipv4-address" value="10.7.7.7"/>
@@ -2477,6 +2484,7 @@ approved.</p>
       <description>
         <p>None.</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-08"/>
       <prop name="asset-type" value="web-server"/>
       <prop name="ipv4-address" value="10.8.8.8"/>
@@ -2495,6 +2503,7 @@ approved.</p>
       <description>
         <p>Email-Service</p>
       </description>
+      <prop name="hardware-model" value="model"/>
       <prop name="asset-id" value="unique-asset-ID-09"/>
       <prop name="asset-type" value="email-server"/>
       <prop name="ipv4-address" value="10.10.10.100"/>
diff --git a/src/validations/constraints/content/ssp-inventory-item-has-hardware-model-INVALID.xml b/src/validations/constraints/content/ssp-inventory-item-has-hardware-model-INVALID.xml
new file mode 100644
index 000000000..08c896ed1
--- /dev/null
+++ b/src/validations/constraints/content/ssp-inventory-item-has-hardware-model-INVALID.xml
@@ -0,0 +1,7 @@
+<system-security-plan xmlns="http://csrc.nist.gov/ns/oscal/1.0" uuid="11111111-2222-4000-8000-000000000000">
+  <system-implementation>
+    <inventory-item uuid="11111111-2222-4000-8000-011000000001">
+      <!-- <prop name="hardware-model" value="model"/> Missing "hardware-model" prop. -->
+    </inventory-item>
+  </system-implementation>
+</system-security-plan>
\ No newline at end of file
diff --git a/src/validations/constraints/fedramp-external-constraints.xml b/src/validations/constraints/fedramp-external-constraints.xml
index f24d6cc41..87a0edb80 100644
--- a/src/validations/constraints/fedramp-external-constraints.xml
+++ b/src/validations/constraints/fedramp-external-constraints.xml
@@ -663,6 +663,11 @@
         <metapath target="/system-security-plan/system-implementation/inventory-item"/>
         <constraints>
             <let var ="component-uuid" expression="implemented-component/@component-uuid"/>
+             <expect id="inventory-item-has-hardware-model" target="." test="count(prop[@name='hardware-model' ]) >= 1 or count(../component[@uuid=$component-uuid]/prop[@name='hardware-model' ]) >= 1" level="ERROR">
+                <formal-name>Inventory Item Has Hardware Model</formal-name>
+                <prop namespace="https://docs.oasis-open.org/sarif/sarif/v2.1.0" name="help-url" value="https://automate.fedramp.gov/documentation/ssp/5-attachments/#system-inventory-approach"/>
+                <message>In a FedRAMP SSP, each inventory item MUST provide the hardware model either in the inventory item itself or within the linked component.</message>
+            </expect>
              <expect id="inventory-item-has-valid-mac-address" target=".[prop[@name='mac-address']]/prop[@name='mac-address']" test="matches(@value, '^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})|([0-9a-fA-F]{4}\\.[0-9a-fA-F]{4}\\.[0-9a-fA-F]{4})$')" level="ERROR">
                 <formal-name>Inventory Item Has Valid Mac Address</formal-name>
                 <prop namespace="https://docs.oasis-open.org/sarif/sarif/v2.1.0" name="help-url" value="https://automate.fedramp.gov/documentation/ssp/5-attachments/#system-inventory-approach"/>
diff --git a/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-FAIL.yaml b/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-FAIL.yaml
new file mode 100644
index 000000000..bd3ccafde
--- /dev/null
+++ b/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-FAIL.yaml
@@ -0,0 +1,9 @@
+test-case:
+  name: Negative Test for inventory-item-has-hardware-model
+  description: >-
+    This test case validates the behavior of constraint
+    inventory-item-has-hardware-model
+  content: ../content/ssp-inventory-item-has-hardware-model-INVALID.xml
+  expectations:
+    - constraint-id: inventory-item-has-hardware-model
+      result: fail
diff --git a/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-PASS.yaml b/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-PASS.yaml
new file mode 100644
index 000000000..f6fff17c8
--- /dev/null
+++ b/src/validations/constraints/unit-tests/inventory-item-has-hardware-model-PASS.yaml
@@ -0,0 +1,9 @@
+test-case:
+  name: Positive Test for inventory-item-has-hardware-model
+  description: >-
+    This test case validates the behavior of constraint
+    inventory-item-has-hardware-model
+  content: ../../../content/rev5/examples/ssp/xml/fedramp-ssp-example.oscal.xml
+  expectations:
+    - constraint-id: inventory-item-has-hardware-model
+      result: pass