diff --git a/apps/explorer/lib/explorer/chain/import.ex b/apps/explorer/lib/explorer/chain/import.ex
index c4f0ffe779..4ea5d7b0c2 100644
--- a/apps/explorer/lib/explorer/chain/import.ex
+++ b/apps/explorer/lib/explorer/chain/import.ex
@@ -26,10 +26,6 @@ defmodule Explorer.Chain.Import do
   @type changeset_function_name :: atom
   @type on_conflict :: :nothing | :replace_all
   @type params :: [map()]
-  @type block_second_degree_relations_options :: %{
-          required(:params) => params,
-          optional(:timeout) => timeout
-        }
   @type internal_transactions_options :: %{
           required(:params) => params,
           optional(:timeout) => timeout
@@ -69,7 +65,7 @@ defmodule Explorer.Chain.Import do
           optional(:addresses) => Import.Addresses.options(),
           optional(:address_coin_balances) => Import.Address.CoinBalances.options(),
           optional(:blocks) => Import.Blocks.options(),
-          optional(:block_second_degree_relations) => block_second_degree_relations_options,
+          optional(:block_second_degree_relations) => Import.Block.SecondDegreeRelations.options(),
           optional(:broadcast) => boolean,
           optional(:internal_transactions) => internal_transactions_options,
           optional(:logs) => logs_options,
@@ -87,9 +83,7 @@ defmodule Explorer.Chain.Import do
              optional(:addresses) => Import.Addresses.imported(),
              optional(:address_coin_balances) => Import.Address.CoinBalances.imported(),
              optional(:blocks) => Import.Blocks.imported(),
-             optional(:block_second_degree_relations) => [
-               %{required(:nephew_hash) => Hash.Full.t(), required(:uncle_hash) => Hash.Full.t()}
-             ],
+             optional(:block_second_degree_relations) => Import.Block.SecondDegreeRelations.imported(),
              optional(:internal_transactions) => [
                %{required(:index) => non_neg_integer(), required(:transaction_hash) => Hash.Full.t()}
              ],
@@ -113,7 +107,6 @@ defmodule Explorer.Chain.Import do
 
   @transaction_timeout 120_000
 
-  @insert_block_second_degree_relations_timeout 60_000
   @insert_internal_transactions_timeout 60_000
   @insert_logs_timeout 60_000
   @insert_token_transfers_timeout 60_000
@@ -122,7 +115,6 @@ defmodule Explorer.Chain.Import do
   @insert_transactions_timeout 60_000
   @insert_transaction_forks_timeout 60_000
 
-  def block_second_degree_relations_timeout, do: @insert_block_second_degree_relations_timeout
   def transactions_timeout, do: @insert_transactions_timeout
   def transaction_forks_timeout, do: @insert_transaction_forks_timeout
 
@@ -174,7 +166,8 @@ defmodule Explorer.Chain.Import do
       * `:timeout` - the timeout for inserting all blocks. Defaults to `#{Import.Blocks.timeout()}` milliseconds.
     * `:block_second_degree_relations`
       * `:params` - `list` of params `for `Explorer.Chain.Block.SecondDegreeRelation.changeset/2`.
-      * `:timeout` - the timeout for inserting all uncles found in the params list.
+      * `:timeout` - the timeout for inserting all uncles found in the params list.  Defaults to
+        `#{Import.Block.SecondDegreeRelations.timeout()}` milliseconds.
     * `:broadcast` - Boolean flag indicating whether or not to broadcast the event.
     * `:internal_transactions`
       * `:params` - `list` of params for `Explorer.Chain.InternalTransaction.changeset/2`.
@@ -310,7 +303,7 @@ defmodule Explorer.Chain.Import do
     |> Import.Addresses.run(ecto_schema_module_to_changes_list_map, full_options)
     |> Import.Address.CoinBalances.run(ecto_schema_module_to_changes_list_map, full_options)
     |> Import.Blocks.run(ecto_schema_module_to_changes_list_map, full_options)
-    |> run_block_second_degree_relations(ecto_schema_module_to_changes_list_map, full_options)
+    |> Import.Block.SecondDegreeRelations.run(ecto_schema_module_to_changes_list_map, full_options)
     |> run_transactions(ecto_schema_module_to_changes_list_map, full_options)
     |> run_transaction_forks(ecto_schema_module_to_changes_list_map, full_options)
     |> run_internal_transactions(ecto_schema_module_to_changes_list_map, full_options)
@@ -481,51 +474,6 @@ defmodule Explorer.Chain.Import do
     end
   end
 
-  defp run_block_second_degree_relations(multi, ecto_schema_module_to_changes_list, options)
-       when is_map(ecto_schema_module_to_changes_list) and is_map(options) do
-    case ecto_schema_module_to_changes_list do
-      %{Block.SecondDegreeRelation => block_second_degree_relations_changes} ->
-        Multi.run(multi, :block_second_degree_relations, fn _ ->
-          insert_block_second_degree_relations(
-            block_second_degree_relations_changes,
-            %{
-              timeout:
-                options[:block_second_degree_relations][:timeout] || @insert_block_second_degree_relations_timeout
-            }
-          )
-        end)
-
-      _ ->
-        multi
-    end
-  end
-
-  @spec insert_block_second_degree_relations([map()], %{required(:timeout) => timeout}) ::
-          {:ok, %{nephew_hash: Hash.Full.t(), uncle_hash: Hash.Full.t()}} | {:error, [Changeset.t()]}
-  defp insert_block_second_degree_relations(changes_list, %{timeout: timeout}) when is_list(changes_list) do
-    # order so that row ShareLocks are grabbed in a consistent order
-    ordered_changes_list = Enum.sort_by(changes_list, &{&1.nephew_hash, &1.uncle_hash})
-
-    insert_changes_list(ordered_changes_list,
-      conflict_target: [:nephew_hash, :uncle_hash],
-      on_conflict:
-        from(
-          block_second_degree_relation in Block.SecondDegreeRelation,
-          update: [
-            set: [
-              uncle_fetched_at:
-                fragment("LEAST(?, EXCLUDED.uncle_fetched_at)", block_second_degree_relation.uncle_fetched_at)
-            ]
-          ]
-        ),
-      for: Block.SecondDegreeRelation,
-      returning: [:nephew_hash, :uncle_hash],
-      timeout: timeout,
-      # block_second_degree_relations doesn't have timestamps
-      timestamps: %{}
-    )
-  end
-
   @spec insert_internal_transactions([map], %{required(:timeout) => timeout, required(:timestamps) => timestamps}) ::
           {:ok, [%{index: non_neg_integer, transaction_hash: Hash.t()}]}
           | {:error, [Changeset.t()]}
diff --git a/apps/explorer/lib/explorer/chain/import/block/second_degree_relations.ex b/apps/explorer/lib/explorer/chain/import/block/second_degree_relations.ex
new file mode 100644
index 0000000000..3490cfa7e4
--- /dev/null
+++ b/apps/explorer/lib/explorer/chain/import/block/second_degree_relations.ex
@@ -0,0 +1,68 @@
+defmodule Explorer.Chain.Import.Block.SecondDegreeRelations do
+  @moduledoc """
+  Bulk imports `t:Explorer.Chain.Block.SecondDegreeRelation.t/0`.
+  """
+
+  require Ecto.Query
+
+  import Ecto.Query, only: [from: 2]
+
+  alias Ecto.{Changeset, Multi}
+  alias Explorer.Chain.{Block, Hash, Import}
+
+  @timeout 60_000
+
+  @type options :: %{
+          required(:params) => Import.params(),
+          optional(:timeout) => timeout
+        }
+  @type imported :: [
+          %{required(:nephew_hash) => Hash.Full.t(), required(:uncle_hash) => Hash.Full.t()}
+        ]
+
+  def run(multi, ecto_schema_module_to_changes_list, options)
+      when is_map(ecto_schema_module_to_changes_list) and is_map(options) do
+    case ecto_schema_module_to_changes_list do
+      %{Block.SecondDegreeRelation => block_second_degree_relations_changes} ->
+        Multi.run(multi, :block_second_degree_relations, fn _ ->
+          insert(
+            block_second_degree_relations_changes,
+            %{
+              timeout: options[:block_second_degree_relations][:timeout] || @timeout
+            }
+          )
+        end)
+
+      _ ->
+        multi
+    end
+  end
+
+  def timeout, do: @timeout
+
+  @spec insert([map()], %{required(:timeout) => timeout}) ::
+          {:ok, %{nephew_hash: Hash.Full.t(), uncle_hash: Hash.Full.t()}} | {:error, [Changeset.t()]}
+  defp insert(changes_list, %{timeout: timeout}) when is_list(changes_list) do
+    # order so that row ShareLocks are grabbed in a consistent order
+    ordered_changes_list = Enum.sort_by(changes_list, &{&1.nephew_hash, &1.uncle_hash})
+
+    Import.insert_changes_list(ordered_changes_list,
+      conflict_target: [:nephew_hash, :uncle_hash],
+      on_conflict:
+        from(
+          block_second_degree_relation in Block.SecondDegreeRelation,
+          update: [
+            set: [
+              uncle_fetched_at:
+                fragment("LEAST(?, EXCLUDED.uncle_fetched_at)", block_second_degree_relation.uncle_fetched_at)
+            ]
+          ]
+        ),
+      for: Block.SecondDegreeRelation,
+      returning: [:nephew_hash, :uncle_hash],
+      timeout: timeout,
+      # block_second_degree_relations doesn't have timestamps
+      timestamps: %{}
+    )
+  end
+end
diff --git a/apps/explorer/lib/explorer/chain/import/blocks.ex b/apps/explorer/lib/explorer/chain/import/blocks.ex
index 7903bbc999..dbd71c0de8 100644
--- a/apps/explorer/lib/explorer/chain/import/blocks.ex
+++ b/apps/explorer/lib/explorer/chain/import/blocks.ex
@@ -56,7 +56,7 @@ defmodule Explorer.Chain.Import.Blocks do
             blocks,
             %{
               timeout:
-                options[:block_second_degree_relations][:timeout] || Import.block_second_degree_relations_timeout(),
+                options[:block_second_degree_relations][:timeout] || Import.Block.SecondDegreeRelations.timeout(),
               timestamps: timestamps
             }
           )
diff --git a/apps/indexer/lib/indexer/block/fetcher.ex b/apps/indexer/lib/indexer/block/fetcher.ex
index 29e80907b5..7c5ec0f37b 100644
--- a/apps/indexer/lib/indexer/block/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/fetcher.ex
@@ -26,7 +26,7 @@ defmodule Indexer.Block.Fetcher do
                 addresses: Import.Addresses.options(),
                 address_coin_balances: Import.Address.CoinBalances.options(),
                 blocks: Import.Blocks.options(),
-                block_second_degree_relations: Import.block_second_degree_relations_options(),
+                block_second_degree_relations: Import.Block.SecondDegreeRelations.options(),
                 broadcast: boolean,
                 logs: Import.logs_options(),
                 receipts: Import.receipts_options(),