It is the latest of several payment extensions for Evergrande's onshore bonds.
Struggling with more than $300 billion in liabilities, the giant property developer defaulted on some payments for its offshore bonds last year.
Onshore bondholders of Hengda's 7% 2026 bond have agreed to delay the coupon payment to Oct. 27, Hengda said in a filing late on Tuesday.
Evergrande said last month it would unveil a debt restructuring proposal for its offshore creditors by the end of July.
Evergrande's dollar bond due April 2023 traded at 11.815 cents on the dollar on Wednesday morning, versus 12.247 a day earlier.
($1 = 6.5445 yuan)
(Reporting by Clare Jim; Editing by Edwina Gibbs)