Walther KK500 Torque Values

[GolfShot]

Hi,

Ive recently purchased an torque wrench and want to play around with torque values on the action bolts.

Any recommendations on what nm the four action bolts should be?


Thanks

[analretentive]

3.5 nm or 31 in. lbs.

Gerry

[Shakeyaim]

Just in case anybody is searching the topic for the Blacktec model that uses two action screws - 4.5 to 5.0Nm is what Walther recommend to me.

[GolfShot]

I will give 3.5nm a try next time im at the range.

Thanks Gerry

[40xguy]

try different torque settings.... it just might change your group size !!

[analretentive]

try different torque settings.... it just might change your group size !!

Most of my other rifles benefit from playing with the torque, but they all have front and rear action screws. I usually tighten both to factory specs, then loosen the rear screw almost totally...at least for starters.

The Walther only has action screws in about 1 1/2 square inches directly under the barrel tenon in the receiver...none at the rear of the receiver. I'm not sure playing with the torque will get you anywhere; but I could be wrong.

Gerry

[Shakeyaim]

I realise this is a bit of a sideline to this thread but since it's related to the action screw area of the receiver I thought I'd ask...(This is just for my own curiosity)

I have the Blacktec stock model that uses the two central action screws to mount it to the stock. The Expert and Anatomic presumably both use the 4 smaller screw holes arranged in a square pattern? Or does either one of them use the same two screws as the Blacktec?



Also, there is a counter bored, tapped hole on the underside of the receiver. There is a matching hole in the Blacktec stock - when I first removed my action from the stock I thought there possibly should be a recoil lug screwed into this hole and mine was missing. I contacted Walther and they told me there shouldn't be anything there on the Blacktec stock. What is this counter bored hole for? Do the Expert or Anatomic models utilise this hole for anything? Recoil lug?



Thanks.

(P.S. - my receiver looks manky in those images, it's actually a coating of Renaissance Wax I was after rubbing on it as a corrosion barrier while it was out of the stock. I'd hate anyone to think I don't look after my gun. Oh the shame!)

[analretentive]

I am a benchrest troglodyte, so I can only speak for the Walther benchrest stock. The attachment hardware includes a steel pillar and taper head hex drive bolt. The pillar goes through the stock and into the recess in the receiver.

Gerry

[CarlosGT]

As Gerry suggest 3.5Nm (31 in/lb) did the trick on a Walther Bench Rest stock (it has 5 action screws: 4 + 1) and get 298 score on a 100m F-Classs Rimfire just out of the box.
Walther dealer suggest values from 3.8 to 4.2 Nm (33.6 - 37.17 in/lb).
I have found than, after use (about 80 shots) , action screws must be slightly re-tightened and the torque wrench has a little tighten movement when set at 31 in/lb. I guess the stock and the action are still knowing each other...

[Eck]

I asked the same question of Walter, and was told not to exceed 4.0 Nm.

[analretentive]

I actually made four tiny aluminum pillars for the four small bolts; and used a drop of blue Loctite on all five bolts. I'm at about a case and a half, and my torque driver still clicks at 3.5 Nm. I imagine the bolts would loosen a little bit directly through the wood with no Loctite. 3.5 is what Walther (Germany) told me in email. 3.8 is certainly not going to be too much, and is probably correct for composite/aluminum stocks. I've never seen it specified in print anywhere.

Gerry

[GolfShot]

I actually made four tiny aluminum pillars for the four small bolts; and used a drop of blue Loctite on all five bolts. I'm at about a case and a half, and my torque driver still clicks at 3.5 Nm. I imagine the bolts would loosen a little bit directly through the wood with no Loctite. 3.5 is what Walther (Germany) told me in email. 3.8 is certainly not going to be too much, and is probably correct for composite/aluminum stocks. I've never seen it specified in print anywhere.

Gerry

could you post a photo of the pillars. curious to see what they look like how there installed.

[analretentive]

Golfshot,

Forgive me for not disassembling my stock, but I did buy an extra set of hardware. It's just basically four aluminum spacers ,(aluminumspacers.com....11/64 id, 5/16 od). You have to rebore the four holes in the stock. (Don't do this if you don't have access to a mill), cut the spacers close to length. Epoxy in place flush on the inside, then file, mill, sand flush on the outside. Probably way overkilled, but I'm anal.

Don't use Loctite if you don't use pillars. This information is for the Walther wooden benchrest stock.

Gerry

[GolfShot]

Golfshot,

Forgive me for not disassembling my stock, but I did buy an extra set of hardware. It's just basically four aluminum spacers ,(aluminumspacers.com....11/64 id, 5/16 od). You have to rebore the four holes in the stock. (Don't do this if you don't have access to a mill), cut the spacers close to length. Epoxy in place flush on the inside, then file, mill, sand flush on the outside. Probably way overkilled, but I'm anal.

Don't use Loctite if you don't use pillars. This information is for the Walther wooden benchrest stock.

Gerry

Thanks for that photo. Is that enough thread engagement? Doesnt seem like much.

[analretentive]

No. The spacers in the photo (1/2") have not been cut to size...will lose about 1/3 of thier length.

Gerry