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All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Topic started by: SynRodSteve on January 19, 2017, 05:13:20 PM

Title: Need to source small OD #8 screw flat washers
Post by: SynRodSteve on January 19, 2017, 05:13:20 PM
I'm searching for #8 screw flat washer with OD of .25. I've searched everywhere I know of but they're all .375 OD. This washer will fit under the cocking lug bolt in a custom hammer for the Marauder.   Alternatively, somewhere to source the stripper bolt (aka cocking lug) with shorter threads but longer top section than OEM.

Any help would be greatly appreciated.
Title: Re: Need to source small OD #8 screw flat washers
Post by: Roadworthy on January 19, 2017, 06:50:15 PM
Try the McMaster-Carr catalog.  Alternatively put the washer onto a number eight screw, tighten the nut, chuck it into a drill, and while spinning the drill apply pressure from a file.  It goes pretty quickly.
Title: Re: Need to source small OD #8 screw flat washers
Post by: SynRodSteve on January 19, 2017, 07:04:46 PM
I'll have to give that a shot.  I need 50 of em tho!  :)  I have a lathe so that might not be a bad option to at least try.  I could make a fixture to hold it out away from the chuck and put a file to it.
Title: Re: Need to source small OD #8 screw flat washers
Post by: fivestar45 on January 19, 2017, 07:54:08 PM
If you have a lathe why don't you just drill some .250" stock and part off as many washers as you need?
Title: Re: Need to source small OD #8 screw flat washers
Post by: Roadworthy on January 19, 2017, 08:18:09 PM
The closest I could find was a Belleville washer for a socket head screw at McMaster Carr. 

https://www.mcmaster.com/#standard-washers/=15zhfy1 (https://www.mcmaster.com/#standard-washers/=15zhfy1)
Title: Re: Need to source small OD #8 screw flat washers
Post by: SynRodSteve on January 19, 2017, 08:38:45 PM
@fivestar.  I could certainly do that but was trying to avoid that time spent, and wasted material.  I need 50 of em.  The cutoff tool is thicker than the washer I need so every washer produced would waste more than that material.  Not a big cost but was just trying to avoid.  I did find some DOM tubing with close dimensions that I could do the same with to avoid the drilling operation. 
Title: Re: Need to source small OD #8 screw flat washers
Post by: rsterne on January 20, 2017, 01:47:00 AM
I just made my own cocking lugs for the hammers in my BRod builds.... I took an 8-32 SHCS, installed a hex nut tightened against the head with green Loctite (won't budge once set)... I then chucked it in the lathe and turned both the nut and bolt head down to 1/4" to clear in the cocking slot in the receiver....

Bob
Title: Re: Need to source small OD #8 screw flat washers
Post by: Hoosier Daddy on January 20, 2017, 07:26:51 AM
What about going the other way. Get some .250 OD washers, stack them up and drill out the hole to your #8 bolt size?

FASTENAL #3 WASHER (https://www.fastenal.com/products/details/33064?r=~|categoryl1:%22600000%20Fasteners%22|~%20~|categoryl2:%22600089%20Washers%22|~%20~|categoryl3:%22600097%20Flat%20Washers%22|~%20~|sattr04:^0.250%22$|~%20~|sattr07:^Steel$|~)
Title: Re: Need to source small OD #8 screw flat washers
Post by: fivestar45 on January 21, 2017, 12:27:44 PM
@fivestar.  I could certainly do that but was trying to avoid that time spent, and wasted material.  I need 50 of em.  The cutoff tool is thicker than the washer I need so every washer produced would waste more than that material.  Not a big cost but was just trying to avoid.  I did find some DOM tubing with close dimensions that I could do the same with to avoid the drilling operation. 
Are these washers required to be made from metal? If you can get away with delrin you could knock them out in no time,  and cheaply.
Title: Re: Need to source small OD #8 screw flat washers
Post by: SynRodSteve on January 22, 2017, 06:39:22 PM
Thanks for the responses. Hopefully I've eliminated the need for these. I appreciate the help.