SAN FRANCISCO, SEPT. 16 -- Defensive end Fred Stokes, playing only on passing downs, made it through the entire game with his left shoulder intact.

Stokes said the injury that had bothered him so much in last week's game against Phoenix was not a factor this afternoon and that he should be able to play more.

One reason is that a new harness the Redskins ordered seemed "to do what it was supposed to do," Stokes said. "I feel really good about it right now. I took one really hard hit on it and it stayed in there. I'm hoping this is the big test. If I can keep doing this, I'll be in good shape." Injury Report

The Redskins apparently didn't suffer any serious injuries today. Jeff Bostic and Markus Koch had mild concussions and returned to the game; Earnest Byner dislocated a finger and returned to the game; Ed Simmons jammed his neck and was available to return; and Monte Coleman suffered a strained right hamstring.

At the moment, all are expected to play in next week's game against the Dallas Cowboys at RFK Stadium. Joe Morris to Get Tryout

Running back Joe Morris, cut by the New York Giants two weeks ago, has been invited to Redskin Park for a Tuesday workout.

However, Redskins General Manager Charley Casserly said he has no plans to sign a running back and that bringing in veteran players for Tuesday workouts is a normal procedure. Williams: Inactive Duty

Eric Williams, having had just two full practices, was put on the two-man inactive list for today's game. The Redskins said that with Stokes having had a good week of practice and with Williams not in football shape or familiar with the system, it didn't make sense to rush him into play.

Guard Mark Adickes was the other player on the two-man inactive list. Second-Half Shutdown

The Redskins defense allowed two second-half field goals, but has still allowed only one touchdown in the second half of its last nine regular season games. Mike Cofer's two field goals were only the second and third the Redskins have allowed in this streak. . . .

Joe Montana has passed for more yards five times in his career. By yardage they are: 458 against the Rams in 1989; 441 against the Redskins in 1986; 429 against the Falcons in 1985; 428 against the Eagles in 1989; 408 against the Cardinals in 1982; and today's 390 against the Redskins. . . .

Montana, a week after getting sacked six times by the Saints, wasn't gotten once by the Redskins. "That looked like a pretty good offensive line to me," Gibbs said.