Hi @billburns62 ,
Great question! Each plan will vary. You will want to contact your plan administrator. I can view my options online for my Empower Retirement account. You may try logging into your account and exploring a bit. It will tell you maximum loan amount for your balance etc. Here is a basic overview of how 401K loans work
401(k) loans
With a 401(k) loan, you borrow money from your retirement savings account. Depending on what your employer's plan allows, you could take out as much as 50% of your savings, up to a maximum of $50,000, within a 12-month period.
Remember, you'll have to pay that borrowed money back, plus interest, within 5 years of taking your loan, in most cases. Your plan's rules will also set a maximum number of loans you may have outstanding from your plan. You may also need consent from your spouse/domestic partner to take a loan.
Here is an article explaining ways to leverage retirement to deal with life's surprises. Pro's and Con's
https://www.fidelity.com/viewpoints/financial-basics/taking-money-from-401k
