J frame hammer springs

MR.G · November 27, 2001, 10:56 PM

Can anyone tell me if the factory hammer spring is heavier on the s&s j frames, with the frame mounted firing pins, than the ones with the hammer mounted pins? If I am correct the ones with the hammer mounted firing pins had a 8.5 lb. factory spring. The ones with the frame mounted firing pins seem to have a much stronger trigger pull, even when the rebound spring is lightened up, which leads me to believe the hammer spring is heavier than 8.5 lb. Does anyone know if changing the hammer spring to an 8 lb. Wolf, in the frame mounted guns effects their reliability?

**Mike Irwin** · November 29, 2001, 10:58 PM

I think that the answer is yes.

I've heard from a number of people that the hammer spring rate had to be upped because the frame-mounted firing pin requires a much firmer "whack." That's because you lose a tremendous amount of energy in the transfer from the hammer to the firing pin to the primer as compared to the hammer mounted firing pins.

November 27, 2001, 10:56 PM	#1
MR.G Senior Member Join Date: July 20, 2001 Posts: 641	J frame hammer springs Can anyone tell me if the factory hammer spring is heavier on the s&s j frames, with the frame mounted firing pins, than the ones with the hammer mounted pins? If I am correct the ones with the hammer mounted firing pins had a 8.5 lb. factory spring. The ones with the frame mounted firing pins seem to have a much stronger trigger pull, even when the rebound spring is lightened up, which leads me to believe the hammer spring is heavier than 8.5 lb. Does anyone know if changing the hammer spring to an 8 lb. Wolf, in the frame mounted guns effects their reliability?

November 29, 2001, 10:58 PM	#2
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,381	I think that the answer is yes. I've heard from a number of people that the hammer spring rate had to be upped because the frame-mounted firing pin requires a much firmer "whack." That's because you lose a tremendous amount of energy in the transfer from the hammer to the firing pin to the primer as compared to the hammer mounted firing pins. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.