diff --git a/app/scripts/controllers/network/pending-middleware.test.js b/app/scripts/controllers/network/pending-middleware.test.js
index 49e60aaa4..9d89e59f1 100644
--- a/app/scripts/controllers/network/pending-middleware.test.js
+++ b/app/scripts/controllers/network/pending-middleware.test.js
@@ -1,4 +1,5 @@
 import { strict as assert } from 'assert';
+import { GAS_LIMITS } from '../../../../shared/constants/gas';
 import { txMetaStub } from '../../../../test/stub/tx-meta-stub';
 import {
   createPendingNonceMiddleware,
@@ -55,7 +56,7 @@ describe('PendingNonceMiddleware', function () {
       blockHash: null,
       blockNumber: null,
       from: '0xf231d46dd78806e1dd93442cf33c7671f8538748',
-      gas: '0x5208',
+      gas: GAS_LIMITS.SIMPLE,
       gasPrice: '0x1e8480',
       hash:
         '0x2cc5a25744486f7383edebbf32003e5a66e18135799593d6b5cdd2bb43674f09',
diff --git a/app/scripts/controllers/transactions/index.js b/app/scripts/controllers/transactions/index.js
index 9b7011a66..fa7c46a2b 100644
--- a/app/scripts/controllers/transactions/index.js
+++ b/app/scripts/controllers/transactions/index.js
@@ -23,6 +23,7 @@ import {
   TRANSACTION_TYPES,
 } from '../../../../shared/constants/transaction';
 import { METAMASK_CONTROLLER_EVENTS } from '../../metamask-controller';
+import { GAS_LIMITS } from '../../../../shared/constants/gas';
 import TransactionStateManager from './tx-state-manager';
 import TxGasUtil from './tx-gas-utils';
 import PendingTransactionTracker from './pending-tx-tracker';
@@ -30,7 +31,6 @@ import * as txUtils from './lib/util';
 
 const hstInterface = new ethers.utils.Interface(abi);
 
-const SIMPLE_GAS_COST = '0x5208'; // Hex for 21000, cost of a simple send.
 const MAX_MEMSTORE_TX_LIST_SIZE = 100; // Number of transactions (by unique nonces) to keep in memory
 
 /**
@@ -366,7 +366,7 @@ export default class TransactionController extends EventEmitter {
       }
 
       // This is a standard ether simple send, gas requirement is exactly 21k
-      return { gasLimit: SIMPLE_GAS_COST };
+      return { gasLimit: GAS_LIMITS.SIMPLE };
     }
 
     const {
@@ -404,7 +404,7 @@ export default class TransactionController extends EventEmitter {
         from,
         to: from,
         nonce,
-        gas: customGasLimit || '0x5208',
+        gas: customGasLimit || GAS_LIMITS.SIMPLE,
         value: '0x0',
         gasPrice: newGasPrice,
       },
diff --git a/shared/constants/gas.js b/shared/constants/gas.js
new file mode 100644
index 000000000..03f8e29f7
--- /dev/null
+++ b/shared/constants/gas.js
@@ -0,0 +1,9 @@
+import { addHexPrefix } from 'ethereumjs-util';
+import { decimalToHex } from '../../ui/helpers/utils/conversions.util';
+
+export const GAS_LIMITS = {
+  // maximum gasLimit of a simple send
+  SIMPLE: addHexPrefix(decimalToHex(21_000)),
+  // a base estimate for token transfers.
+  BASE_TOKEN_ESTIMATE: addHexPrefix(decimalToHex(100_000)),
+};
diff --git a/test/stub/tx-meta-stub.js b/test/stub/tx-meta-stub.js
index 0af67dd20..bb1fc4f99 100644
--- a/test/stub/tx-meta-stub.js
+++ b/test/stub/tx-meta-stub.js
@@ -1,3 +1,4 @@
+import { GAS_LIMITS } from '../../shared/constants/gas';
 import {
   TRANSACTION_STATUSES,
   TRANSACTION_TYPES,
@@ -16,7 +17,7 @@ export const txMetaStub = {
       type: TRANSACTION_TYPES.SENT_ETHER,
       txParams: {
         from: '0xf231d46dd78806e1dd93442cf33c7671f8538748',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x1e8480',
         to: '0xf231d46dd78806e1dd93442cf33c7671f8538748',
         value: '0x0',
@@ -197,7 +198,7 @@ export const txMetaStub = {
   type: TRANSACTION_TYPES.SENT_ETHER,
   txParams: {
     from: '0xf231d46dd78806e1dd93442cf33c7671f8538748',
-    gas: '0x5208',
+    gas: GAS_LIMITS.SIMPLE,
     gasPrice: '0x1e8480',
     nonce: '0x4',
     to: '0xf231d46dd78806e1dd93442cf33c7671f8538748',
diff --git a/ui/components/app/gas-customization/gas-modal-page-container/gas-modal-page-container.container.js b/ui/components/app/gas-customization/gas-modal-page-container/gas-modal-page-container.container.js
index 4dbbeec22..0c1597fe3 100644
--- a/ui/components/app/gas-customization/gas-modal-page-container/gas-modal-page-container.container.js
+++ b/ui/components/app/gas-customization/gas-modal-page-container/gas-modal-page-container.container.js
@@ -56,6 +56,7 @@ import {
 import { MIN_GAS_LIMIT_DEC } from '../../../../pages/send/send.constants';
 import { calcMaxAmount } from '../../../../pages/send/send-content/send-amount-row/amount-max-button/amount-max-button.utils';
 import { TRANSACTION_STATUSES } from '../../../../../shared/constants/transaction';
+import { GAS_LIMITS } from '../../../../../shared/constants/gas';
 import GasModalPageContainer from './gas-modal-page-container.component';
 
 const mapStateToProps = (state, ownProps) => {
@@ -73,7 +74,7 @@ const mapStateToProps = (state, ownProps) => {
   const txParams = selectedTransaction?.txParams
     ? selectedTransaction.txParams
     : {
-        gas: send.gasLimit || '0x5208',
+        gas: send.gasLimit || GAS_LIMITS.SIMPLE,
         gasPrice: send.gasPrice || getAveragePriceEstimateInHexWEI(state, true),
         value: sendToken ? '0x0' : send.amount,
       };
@@ -82,7 +83,7 @@ const mapStateToProps = (state, ownProps) => {
   const value = ownProps.transaction?.txParams?.value || txParams.value;
   const customModalGasPriceInHex = getCustomGasPrice(state) || currentGasPrice;
   const customModalGasLimitInHex =
-    getCustomGasLimit(state) || currentGasLimit || '0x5208';
+    getCustomGasLimit(state) || currentGasLimit || GAS_LIMITS.SIMPLE;
   const customGasTotal = calcGasTotal(
     customModalGasLimitInHex,
     customModalGasPriceInHex,
diff --git a/ui/components/app/transaction-activity-log/transaction-activity-log.util.test.js b/ui/components/app/transaction-activity-log/transaction-activity-log.util.test.js
index af7adee79..50a221a9e 100644
--- a/ui/components/app/transaction-activity-log/transaction-activity-log.util.test.js
+++ b/ui/components/app/transaction-activity-log/transaction-activity-log.util.test.js
@@ -1,3 +1,4 @@
+import { GAS_LIMITS } from '../../../../shared/constants/gas';
 import {
   ROPSTEN_CHAIN_ID,
   ROPSTEN_NETWORK_ID,
@@ -34,7 +35,7 @@ describe('TransactionActivityLog utils', () => {
                 from: '0x50a9d56c2b8ba9a5c7f2c08c3d26e0499f23a706',
                 to: '0xc5ae6383e126f901dcb06131d97a88745bfa88d6',
                 value: '0x2386f26fc10000',
-                gas: '0x5208',
+                gas: GAS_LIMITS.SIMPLE,
                 gasPrice: '0x3b9aca00',
               },
               type: TRANSACTION_TYPES.STANDARD,
@@ -82,7 +83,7 @@ describe('TransactionActivityLog utils', () => {
           time: 1543958845581,
           txParams: {
             from: '0x50a9d56c2b8ba9a5c7f2c08c3d26e0499f23a706',
-            gas: '0x5208',
+            gas: GAS_LIMITS.SIMPLE,
             gasPrice: '0x3b9aca00',
             nonce: '0x32',
             to: '0xc5ae6383e126f901dcb06131d97a88745bfa88d6',
@@ -105,7 +106,7 @@ describe('TransactionActivityLog utils', () => {
                 from: '0x50a9d56c2b8ba9a5c7f2c08c3d26e0499f23a706',
                 to: '0xc5ae6383e126f901dcb06131d97a88745bfa88d6',
                 value: '0x2386f26fc10000',
-                gas: '0x5208',
+                gas: GAS_LIMITS.SIMPLE,
                 gasPrice: '0x3b9aca00',
                 nonce: '0x32',
               },
@@ -176,7 +177,7 @@ describe('TransactionActivityLog utils', () => {
           time: 1543958857697,
           txParams: {
             from: '0x50a9d56c2b8ba9a5c7f2c08c3d26e0499f23a706',
-            gas: '0x5208',
+            gas: GAS_LIMITS.SIMPLE,
             gasPrice: '0x481f2280',
             nonce: '0x32',
             to: '0xc5ae6383e126f901dcb06131d97a88745bfa88d6',
@@ -244,7 +245,7 @@ describe('TransactionActivityLog utils', () => {
         status: TRANSACTION_STATUSES.CONFIRMED,
         txParams: {
           from: '0x1',
-          gas: '0x5208',
+          gas: GAS_LIMITS.SIMPLE,
           gasPrice: '0x3b9aca00',
           nonce: '0xa4',
           to: '0x2',
@@ -267,7 +268,7 @@ describe('TransactionActivityLog utils', () => {
             time: 1535507561452,
             txParams: {
               from: '0x1',
-              gas: '0x5208',
+              gas: GAS_LIMITS.SIMPLE,
               gasPrice: '0x3b9aca00',
               nonce: '0xa4',
               to: '0x2',
@@ -395,7 +396,7 @@ describe('TransactionActivityLog utils', () => {
         status: TRANSACTION_STATUSES.CONFIRMED,
         txParams: {
           from: '0x1',
-          gas: '0x5208',
+          gas: GAS_LIMITS.SIMPLE,
           gasPrice: '0x3b9aca00',
           nonce: '0xa4',
           to: '0x2',
diff --git a/ui/components/app/transaction-breakdown/transaction-breakdown.component.test.js b/ui/components/app/transaction-breakdown/transaction-breakdown.component.test.js
index fb7916c46..3ac6aa268 100644
--- a/ui/components/app/transaction-breakdown/transaction-breakdown.component.test.js
+++ b/ui/components/app/transaction-breakdown/transaction-breakdown.component.test.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { shallow } from 'enzyme';
 import { TRANSACTION_STATUSES } from '../../../../shared/constants/transaction';
+import { GAS_LIMITS } from '../../../../shared/constants/gas';
 import TransactionBreakdown from './transaction-breakdown.component';
 
 describe('TransactionBreakdown Component', () => {
@@ -11,7 +12,7 @@ describe('TransactionBreakdown Component', () => {
       status: TRANSACTION_STATUSES.CONFIRMED,
       txParams: {
         from: '0x1',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x3b9aca00',
         nonce: '0xa4',
         to: '0x2',
diff --git a/ui/components/app/transaction-list-item-details/transaction-list-item-details.component.test.js b/ui/components/app/transaction-list-item-details/transaction-list-item-details.component.test.js
index 409ca1092..4164de3a3 100644
--- a/ui/components/app/transaction-list-item-details/transaction-list-item-details.component.test.js
+++ b/ui/components/app/transaction-list-item-details/transaction-list-item-details.component.test.js
@@ -5,6 +5,7 @@ import SenderToRecipient from '../../ui/sender-to-recipient';
 import TransactionBreakdown from '../transaction-breakdown';
 import TransactionActivityLog from '../transaction-activity-log';
 import { TRANSACTION_STATUSES } from '../../../../shared/constants/transaction';
+import { GAS_LIMITS } from '../../../../shared/constants/gas';
 import TransactionListItemDetails from './transaction-list-item-details.component';
 
 describe('TransactionListItemDetails Component', () => {
@@ -15,7 +16,7 @@ describe('TransactionListItemDetails Component', () => {
       status: TRANSACTION_STATUSES.CONFIRMED,
       txParams: {
         from: '0x1',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x3b9aca00',
         nonce: '0xa4',
         to: '0x2',
@@ -57,7 +58,7 @@ describe('TransactionListItemDetails Component', () => {
       status: TRANSACTION_STATUSES.CONFIRMED,
       txParams: {
         from: '0x1',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x3b9aca00',
         nonce: '0xa4',
         to: '0x2',
@@ -102,7 +103,7 @@ describe('TransactionListItemDetails Component', () => {
       status: 'confirmed',
       txParams: {
         from: '0x1',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x3b9aca00',
         nonce: '0xa4',
         to: '0x2',
@@ -146,7 +147,7 @@ describe('TransactionListItemDetails Component', () => {
       hash: '0xaa',
       txParams: {
         from: '0x1',
-        gas: '0x5208',
+        gas: GAS_LIMITS.SIMPLE,
         gasPrice: '0x3b9aca00',
         nonce: '0xa4',
         to: '0x2',
diff --git a/ui/helpers/utils/confirm-tx.util.test.js b/ui/helpers/utils/confirm-tx.util.test.js
index 2dc8af0ce..71cd49a5a 100644
--- a/ui/helpers/utils/confirm-tx.util.test.js
+++ b/ui/helpers/utils/confirm-tx.util.test.js
@@ -1,3 +1,4 @@
+import { GAS_LIMITS } from '../../../shared/constants/gas';
 import * as utils from './confirm-tx.util';
 
 describe('Confirm Transaction utils', () => {
@@ -34,7 +35,10 @@ describe('Confirm Transaction utils', () => {
   describe('getHexGasTotal', () => {
     it('should multiply the hex gasLimit and hex gasPrice values together', () => {
       expect(
-        utils.getHexGasTotal({ gasLimit: '0x5208', gasPrice: '0x3b9aca00' }),
+        utils.getHexGasTotal({
+          gasLimit: GAS_LIMITS.SIMPLE,
+          gasPrice: '0x3b9aca00',
+        }),
       ).toStrictEqual('0x1319718a5000');
     });
 
diff --git a/ui/hooks/useCancelTransaction.js b/ui/hooks/useCancelTransaction.js
index 03bad3c54..389c2dcfa 100644
--- a/ui/hooks/useCancelTransaction.js
+++ b/ui/hooks/useCancelTransaction.js
@@ -17,6 +17,7 @@ import {
   setCustomGasPriceForRetry,
 } from '../ducks/gas/gas.duck';
 import { multiplyCurrencies } from '../helpers/utils/conversion-util';
+import { GAS_LIMITS } from '../../shared/constants/gas';
 
 /**
  * Determine whether a transaction can be cancelled and provide a method to
@@ -52,13 +53,13 @@ export function useCancelTransaction(transactionGroup) {
   const cancelTransaction = useCallback(
     (event) => {
       event.stopPropagation();
-      dispatch(setCustomGasLimit('0x5208'));
+      dispatch(setCustomGasLimit(GAS_LIMITS.SIMPLE));
       dispatch(setCustomGasPriceForRetry(defaultNewGasPrice));
       const tx = {
         ...transaction,
         txParams: {
           ...transaction.txParams,
-          gas: '0x5208',
+          gas: GAS_LIMITS.SIMPLE,
           value: '0x0',
         },
       };
diff --git a/ui/hooks/useCancelTransaction.test.js b/ui/hooks/useCancelTransaction.test.js
index 28453bc6c..6bc391475 100644
--- a/ui/hooks/useCancelTransaction.test.js
+++ b/ui/hooks/useCancelTransaction.test.js
@@ -6,6 +6,7 @@ import { getConversionRate, getSelectedAccount } from '../selectors';
 import { showModal } from '../store/actions';
 import { increaseLastGasPrice } from '../helpers/utils/confirm-tx.util';
 import * as actionConstants from '../store/actionConstants';
+import { GAS_LIMITS } from '../../shared/constants/gas';
 import { useCancelTransaction } from './useCancelTransaction';
 
 describe('useCancelTransaction', function () {
@@ -77,7 +78,7 @@ describe('useCancelTransaction', function () {
 
         // call onSubmit myself
         dispatchAction[dispatchAction.length - 1][0].value.props.onSubmit(
-          '0x5208',
+          GAS_LIMITS.SIMPLE,
           '0x1',
         );
 
@@ -86,9 +87,9 @@ describe('useCancelTransaction', function () {
             showModal({
               name: 'CANCEL_TRANSACTION',
               transactionId,
-              newGasFee: '0x5208',
+              newGasFee: GAS_LIMITS.SIMPLE,
               defaultNewGasPrice: '0x1',
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             }),
           ),
         ).toStrictEqual(true);
@@ -147,7 +148,7 @@ describe('useCancelTransaction', function () {
         ).toStrictEqual(transactionId);
 
         dispatchAction[dispatchAction.length - 1][0].value.props.onSubmit(
-          '0x5208',
+          GAS_LIMITS.SIMPLE,
           '0x1',
         );
 
@@ -156,9 +157,9 @@ describe('useCancelTransaction', function () {
             showModal({
               name: 'CANCEL_TRANSACTION',
               transactionId,
-              newGasFee: '0x5208',
+              newGasFee: GAS_LIMITS.SIMPLE,
               defaultNewGasPrice: '0x1',
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             }),
           ),
         ).toStrictEqual(true);
diff --git a/ui/pages/send/send.constants.js b/ui/pages/send/send.constants.js
index ffeaf0397..ba5113603 100644
--- a/ui/pages/send/send.constants.js
+++ b/ui/pages/send/send.constants.js
@@ -38,9 +38,6 @@ const KNOWN_RECIPIENT_ADDRESS_ERROR = 'knownAddressRecipient';
 const CONTRACT_ADDRESS_ERROR = 'contractAddressError';
 const CONFUSING_ENS_ERROR = 'confusingEnsDomain';
 
-const SIMPLE_GAS_COST = '0x5208'; // Hex for 21000, cost of a simple send.
-const BASE_TOKEN_GAS_COST = '0x186a0'; // Hex for 100000, a base estimate for token transfers.
-
 export {
   INSUFFICIENT_FUNDS_ERROR,
   INSUFFICIENT_TOKENS_ERROR,
@@ -57,7 +54,5 @@ export {
   NEGATIVE_ETH_ERROR,
   REQUIRED_ERROR,
   CONFUSING_ENS_ERROR,
-  SIMPLE_GAS_COST,
   TOKEN_TRANSFER_FUNCTION_SIGNATURE,
-  BASE_TOKEN_GAS_COST,
 };
diff --git a/ui/pages/send/send.utils.js b/ui/pages/send/send.utils.js
index 1603061e2..12ebc901f 100644
--- a/ui/pages/send/send.utils.js
+++ b/ui/pages/send/send.utils.js
@@ -11,13 +11,12 @@ import {
 import { calcTokenAmount } from '../../helpers/utils/token-util';
 import { addHexPrefix } from '../../../app/scripts/lib/util';
 
+import { GAS_LIMITS } from '../../../shared/constants/gas';
 import {
-  BASE_TOKEN_GAS_COST,
   INSUFFICIENT_FUNDS_ERROR,
   INSUFFICIENT_TOKENS_ERROR,
   MIN_GAS_LIMIT_HEX,
   NEGATIVE_ETH_ERROR,
-  SIMPLE_GAS_COST,
   TOKEN_TRANSFER_FUNCTION_SIGNATURE,
 } from './send.constants';
 
@@ -208,10 +207,10 @@ async function estimateGasForSend({
     // Geth will return '0x', and ganache-core v2.2.1 will return '0x0'
     const codeIsEmpty = !code || code === '0x' || code === '0x0';
     if (codeIsEmpty) {
-      return SIMPLE_GAS_COST;
+      return GAS_LIMITS.SIMPLE;
     }
   } else if (sendToken && !to) {
-    return BASE_TOKEN_GAS_COST;
+    return GAS_LIMITS.BASE_TOKEN_ESTIMATE;
   }
 
   if (sendToken) {
diff --git a/ui/pages/send/send.utils.test.js b/ui/pages/send/send.utils.test.js
index 06d3d8edc..f1da44f9b 100644
--- a/ui/pages/send/send.utils.test.js
+++ b/ui/pages/send/send.utils.test.js
@@ -8,6 +8,7 @@ import {
   conversionUtil,
 } from '../../helpers/utils/conversion-util';
 
+import { GAS_LIMITS } from '../../../shared/constants/gas';
 import {
   calcGasTotal,
   estimateGasForSend,
@@ -23,8 +24,6 @@ import {
 } from './send.utils';
 
 import {
-  BASE_TOKEN_GAS_COST,
-  SIMPLE_GAS_COST,
   INSUFFICIENT_FUNDS_ERROR,
   INSUFFICIENT_TOKENS_ERROR,
 } from './send.constants';
@@ -381,38 +380,38 @@ describe('send utils', () => {
       expect(result).toStrictEqual('0xabc16');
     });
 
-    it(`should return ${SIMPLE_GAS_COST} if ethQuery.getCode does not return '0x'`, async () => {
+    it(`should return ${GAS_LIMITS.SIMPLE} if ethQuery.getCode does not return '0x'`, async () => {
       expect(baseMockParams.estimateGasMethod.callCount).toStrictEqual(0);
       const result = await estimateGasForSend({
         ...baseMockParams,
         to: '0x123',
       });
-      expect(result).toStrictEqual(SIMPLE_GAS_COST);
+      expect(result).toStrictEqual(GAS_LIMITS.SIMPLE);
     });
 
-    it(`should return ${SIMPLE_GAS_COST} if not passed a sendToken or truthy to address`, async () => {
+    it(`should return ${GAS_LIMITS.SIMPLE} if not passed a sendToken or truthy to address`, async () => {
       expect(baseMockParams.estimateGasMethod.callCount).toStrictEqual(0);
       const result = await estimateGasForSend({ ...baseMockParams, to: null });
-      expect(result).toStrictEqual(SIMPLE_GAS_COST);
+      expect(result).toStrictEqual(GAS_LIMITS.SIMPLE);
     });
 
-    it(`should not return ${SIMPLE_GAS_COST} if passed a sendToken`, async () => {
+    it(`should not return ${GAS_LIMITS.SIMPLE} if passed a sendToken`, async () => {
       expect(baseMockParams.estimateGasMethod.callCount).toStrictEqual(0);
       const result = await estimateGasForSend({
         ...baseMockParams,
         to: '0x123',
         sendToken: { address: '0x0' },
       });
-      expect(result).not.toStrictEqual(SIMPLE_GAS_COST);
+      expect(result).not.toStrictEqual(GAS_LIMITS.SIMPLE);
     });
 
-    it(`should return ${BASE_TOKEN_GAS_COST} if passed a sendToken but no to address`, async () => {
+    it(`should return ${GAS_LIMITS.BASE_TOKEN_ESTIMATE} if passed a sendToken but no to address`, async () => {
       const result = await estimateGasForSend({
         ...baseMockParams,
         to: null,
         sendToken: { address: '0x0' },
       });
-      expect(result).toStrictEqual(BASE_TOKEN_GAS_COST);
+      expect(result).toStrictEqual(GAS_LIMITS.BASE_TOKEN_ESTIMATE);
     });
 
     it(`should return the adjusted blockGasLimit if it fails with a 'Transaction execution error.'`, async () => {
diff --git a/ui/selectors/custom-gas.js b/ui/selectors/custom-gas.js
index 4485c2086..ce921eda5 100644
--- a/ui/selectors/custom-gas.js
+++ b/ui/selectors/custom-gas.js
@@ -10,6 +10,7 @@ import { calcGasTotal } from '../pages/send/send.utils';
 
 import { GAS_ESTIMATE_TYPES } from '../helpers/constants/common';
 import { BASIC_ESTIMATE_STATES, GAS_SOURCE } from '../ducks/gas/gas.duck';
+import { GAS_LIMITS } from '../../shared/constants/gas';
 import {
   getCurrentCurrency,
   getIsMainnet,
@@ -295,7 +296,9 @@ export function getRenderableEstimateDataForSmallButtonsFromGWEI(state) {
   const isMainnet = getIsMainnet(state);
   const showFiat = isMainnet || Boolean(showFiatInTestnets);
   const gasLimit =
-    state.metamask.send.gasLimit || getCustomGasLimit(state) || '0x5208';
+    state.metamask.send.gasLimit ||
+    getCustomGasLimit(state) ||
+    GAS_LIMITS.SIMPLE;
   const { conversionRate } = state.metamask;
   const currentCurrency = getCurrentCurrency(state);
   const {
diff --git a/ui/selectors/custom-gas.test.js b/ui/selectors/custom-gas.test.js
index 8838641fe..a81982f81 100644
--- a/ui/selectors/custom-gas.test.js
+++ b/ui/selectors/custom-gas.test.js
@@ -1,3 +1,4 @@
+import { GAS_LIMITS } from '../../shared/constants/gas';
 import {
   getCustomGasLimit,
   getCustomGasPrice,
@@ -221,7 +222,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: false,
@@ -272,7 +273,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: false,
@@ -323,7 +324,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: true,
@@ -368,7 +369,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: true,
@@ -393,7 +394,7 @@ describe('custom-gas selectors', () => {
         expect(
           getRenderableBasicEstimateData(
             test.mockState,
-            '0x5208',
+            GAS_LIMITS.SIMPLE,
             test.useFastestButtons,
           ),
         ).toStrictEqual(test.expectedResult);
@@ -429,7 +430,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 255.71,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: false,
@@ -474,7 +475,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: false,
@@ -525,7 +526,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: false,
@@ -576,7 +577,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: true,
@@ -621,7 +622,7 @@ describe('custom-gas selectors', () => {
             conversionRate: 2557.1,
             currentCurrency: 'usd',
             send: {
-              gasLimit: '0x5208',
+              gasLimit: GAS_LIMITS.SIMPLE,
             },
             preferences: {
               showFiatInTestnets: true,
diff --git a/ui/store/actions.test.js b/ui/store/actions.test.js
index 73975843d..cf32bac46 100644
--- a/ui/store/actions.test.js
+++ b/ui/store/actions.test.js
@@ -5,6 +5,7 @@ import EthQuery from 'eth-query';
 import enLocale from '../../app/_locales/en/messages.json';
 import MetaMaskController from '../../app/scripts/metamask-controller';
 import { TRANSACTION_STATUSES } from '../../shared/constants/transaction';
+import { GAS_LIMITS } from '../../shared/constants/gas';
 import * as actions from './actions';
 
 const middleware = [thunk];
@@ -902,8 +903,8 @@ describe('Actions', () => {
 
       const expectedActions = [
         { type: 'GAS_LOADING_STARTED' },
-        { type: 'UPDATE_GAS_LIMIT', value: '0x5208' },
-        { type: 'metamask/gas/SET_CUSTOM_GAS_LIMIT', value: '0x5208' },
+        { type: 'UPDATE_GAS_LIMIT', value: GAS_LIMITS.SIMPLE },
+        { type: 'metamask/gas/SET_CUSTOM_GAS_LIMIT', value: GAS_LIMITS.SIMPLE },
         { type: 'UPDATE_SEND_ERRORS', value: { gasLoadingError: null } },
         { type: 'GAS_LOADING_FINISHED' },
       ];
@@ -929,7 +930,7 @@ describe('Actions', () => {
   describe('#updateTransaction', () => {
     const txParams = {
       from: '0x1',
-      gas: '0x5208',
+      gas: GAS_LIMITS.SIMPLE,
       gasPrice: '0x3b9aca00',
       to: '0x2',
       value: '0x0',
@@ -998,7 +999,7 @@ describe('Actions', () => {
           id: '1',
           value: {
             from: '0x1',
-            gas: '0x5208',
+            gas: GAS_LIMITS.SIMPLE,
             gasPrice: '0x3b9aca00',
             to: '0x2',
             value: '0x0',