Torque Time! (HW97 stock screws)



Author Topic: Torque Time! (HW97 stock screws)  (Read 155 times)

Offline jentry

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Torque Time! (HW97 stock screws)
« on: April 13, 2017, 11:53:56 PM »
 I've shot my gun loose, and snugged up screws hold only for about 50 shots. I want to install brass cups and other metal pieces before I pull the hardware and put blue Loctite everywhere, but Mac1 is out of stock.

Do I need this hardware?  Is there another vendor who makes these products?
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline nced

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Re: Torque Time! (HW97 stock screws)
« Reply #1 on: April 14, 2017, 01:08:45 AM »
I've shot my gun loose, and snugged up screws hold only for about 50 shots. I want to install brass cups and other metal pieces before I pull the hardware and put blue Loctite everywhere, but Mac1 is out of stock.

Do I need this hardware?  Is there another vendor who makes these products?
The issue with loosening screws can be over tightening the screws to the point that the wood fibers get crushed. If that happens adding thread locker will keep the screws from turning but the softened wood under the screws still allow screw tension to get loose because the wood has been weakened. I bet that if the HW torque specs were followed the stock wood wouldn't get crushed and screws would stay tight. This is assuming that the stock forearm screws are fitted with both flat and lock washers since some HW stocks had only star lock washers between the screw head and stock wood.

Here are the stock tightening specs for HW springers per HW in Germany..........
Front stock screws = 2.5 Nm (22.1 in/lb)
Large trigger guard screw = 5 Nm (44.3 in/lb)
Rear trigger guard screw = 2.5 Nm (22.1 in/lb) however I personally use only 15 in/lbs torque on this rather small 4mm screw.

I prevent stock wood crushing with home turned piloted steel screw cups and a steel sleeve for the large front trigger guard screw. These mods provide "metal to metal contact" so the stock wood won't get crushed regardless of the screw torque..........









Offline jentry

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Re: Torque Time! (HW97 stock screws)
« Reply #2 on: April 14, 2017, 10:52:28 AM »
NCED, this is all your fault! Had I not found your thread earlier this week, I would already be done with this job. I really like your pictures and the inserted post on the trigger guard, but I  know these parts aren't needed to make things right.

Time to work on the gun and befriend a machinist.
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline TwiceHorn

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Re: Torque Time! (HW97 stock screws)
« Reply #3 on: April 14, 2017, 12:22:59 PM »
How new is your rifle?  My 97 shoots pretty soft (745 with 8.4-8.6 .177 pellets) and has about 1500 down the tube and the stock screws don't work loose very often.  Trigger guard still does, though.
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Offline Hoosier Daddy

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Re: Torque Time! (HW97 stock screws)
« Reply #4 on: April 14, 2017, 01:20:09 PM »
Maybe try your local Hobby Shop, they will have a rack of "K-S Hobby and Craft Metal Tubing".. guaranteed.
You will find some brass tubing that will fit the holes nicely and you can double it up with the next smaller size to increase the wall thickness if needed.
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Offline jentry

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Re: Torque Time! (HW97 stock screws)
« Reply #5 on: April 14, 2017, 06:14:29 PM »
How new is your rifle?  My 97 shoots pretty soft (745 with 8.4-8.6 .177 pellets) and has about 1500 down the tube and the stock screws don't work loose very often.  Trigger guard still does, though.

I was told the gun is about four years old,  so it won't be bad to do a little maintenance. And being .22, I expect it's a little more jumpy than yours.
« Last Edit: April 14, 2017, 06:16:16 PM by jentry »
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline jentry

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Re: Torque Time! (HW97 stock screws)
« Reply #6 on: April 14, 2017, 06:16:56 PM »
Maybe try your local Hobby Shop, they will have a rack of "K-S Hobby and Craft Metal Tubing".. guaranteed.
You will find some brass tubing that will fit the holes nicely and you can double it up with the next smaller size to increase the wall thickness if needed.

Thanks for the suggestion!
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline eeler1

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Re: Torque Time! (HW97 stock screws)
« Reply #7 on: April 16, 2017, 01:28:31 AM »
ive got a couple old sets, nos, pm me if you want them
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Offline wahoowad

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Re: Torque Time! (HW97 stock screws)
« Reply #8 on: April 16, 2017, 10:21:08 AM »
You made no mention of how you tighten them. I bet you are not tightening them enough. Use a torque driver and set them to the manufacturer's recommended torque settings for stock screws and they won't come loose. Then, when you do maintenance like remove action from the stock, you can reassemble the exact settings you had before. Weihrauch will respond if you email them and ask them.
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Offline jentry

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Re: Torque Time! (HW97 stock screws)
« Reply #9 on: April 16, 2017, 06:04:15 PM »
You made no mention of how you tighten them. I bet you are not tightening them enough. Use a torque driver and set them to the manufacturer's recommended torque settings for stock screws and they won't come loose. Then, when you do maintenance like remove action from the stock, you can reassemble the exact settings you had before. Weihrauch will respond if you email them and ask them.

I've not yet touched a single screw. This is a new to me gun, and the first nice one I've owned. I assumed putting in screw cups would add to the life of the gun,  and that's important to me since I rarely get rid of things. Is that an accurate assumption, or something not needed?
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline TwiceHorn

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Re: Torque Time! (HW97 stock screws)
« Reply #10 on: April 16, 2017, 06:18:02 PM »
I think you're right as it being a good preventive measure, generally.  Is it synthetic or wood?  I meant to check it out but forgot to ask you last time out.

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Offline jentry

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Re: Torque Time! (HW97 stock screws)
« Reply #11 on: April 16, 2017, 11:13:02 PM »
I think you're right as it being a good preventive measure, generally.  Is it synthetic or wood?  I meant to check it out but forgot to ask you last time out.

It's a wood thumbhole stock.
  • Lewisville, TX
Crosman Nitro Venom .22
HW97KT .22

Offline TwiceHorn

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Re: Torque Time! (HW97 stock screws)
« Reply #12 on: April 17, 2017, 01:22:08 AM »
I think you're right as it being a good preventive measure, generally.  Is it synthetic or wood?  I meant to check it out but forgot to ask you last time out.

It's a wood thumbhole stock.

Ive seen that some synthetics can be even more susceptible to getting reamed out by screws than wood--break that surface "skin" and you may be screwed, literally.  I might assume that that is only cheaper synthetics and not Weirauchs, but you never know.  Irrelevant in any event.
  • Texas
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How do you word it... "Air Guns" or "AirGuns"?