Broken Allen bolt

• Aug 15, 2015

• #1

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

So I just got my bushnell trs-25 in the mail and I decided to mount to my mpap 92. Installed the picatinny top rail yesterday. Apperently I tightened it too much cause it sheared in half. Surprised it broke in 2 pieces like that. Does anyone know where I can get another bolt ?

 

• Aug 15, 2015

• #2

5

5.56blaster

Ultimate Member

Dec 25, 2012

6,038

The Peoples Republic of Maryland

Try Depot or any good hardware store.

 

• Aug 15, 2015

• #3

llkoolkeg

Hairy Flaccid Member

Sep 28, 2007

5,120

Holding the line South of Gettysburg in 2A-friendl

Tractor Supply or if size is not in stock, Fastenal.

 

• Aug 15, 2015

• #4

rseymorejr

Ultimate Member

MDS Supporter

Feb 28, 2011

26,240

Harford County

McMaster-Carr

 

• Aug 15, 2015

• #5

Mark75H

MD Wear&Carry Instructor

Industry Partner

MDS Supporter

Sep 25, 2011

17,260

Outside the Gates

Many Ace Hardware stores have excellent hardware sections.

 

• Aug 15, 2015

• #6

dontpanic

Ultimate Member

Jul 7, 2013

6,638

Timonium

Just to help in your search. Proper terminology is "Cap head screw"

Ace should have what you need

 

• Aug 15, 2015

• #7

BigDaddy

Ultimate Member

Feb 7, 2014

2,235

I found this on gunloads.com. If it is indeed true, save your gas, Home Depot, Ace, True Value and Lowes won't have it

I am posting this here because there is misleading information on the internet on an "ar-15 website" that I am not affiliated with nor can easily register on to correct the information.

The Bushnell TRS25 has a screw for mounting to a weaver type base and it breaks easily if you use a warne torque wrench for scoperings and subject it to oversized handgun recoil.

That other site comes up high on a google search and is the only site that states the thread pitch so that replacements can be sourced: #6-40, 1.25" long.

That is NOT the thread pitch of the TRS-25!!

The true thread pitch is M3.5-.6. Yes, it is metric. Thread pitch is .6mm which loosely translates to 42.25 TPI. I can see how the other guy got confused. Also turns out an M3.5 major diameter is within .001" of the major diameter of a #6 screw.

Anyways, this mixup caused a week and a half delay in repair here and I'm the proud owner of an extra box of useless 6-40 screws. 1.25" is also too long, needs to be something like 25 or 28mm long. I have some correct screws on the way now, 25mm and 40mm to cut down if the 25mm is just a smidge too short. They had no 30's.

So hopefully now when people google "Bushnell TRS-25 thread pitch" they will be directed here instead, and see the true pitch of the screw.


http://castboolits.gunloads.com/showthread.php?237645-Bushnell-TRS-25-main-screw-thread-pitch

 

Last edited: Aug 15, 2015

• Aug 15, 2015

• #8

Mark75H

MD Wear&Carry Instructor

Industry Partner

MDS Supporter

Sep 25, 2011

17,260

Outside the Gates

Ace in Edgewater has an excellent selection of metric. So do many Lowes locations.

 

• Aug 15, 2015

• #9

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

Thanks for all the quick replies,that's why I love this forum. I have a lowes,depot,ace and fastenal in cockeysville. I'll try to find the correct metric thread pitch to finish this project.


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• Aug 16, 2015

• #10

BigDaddy

Ultimate Member

Feb 7, 2014

2,235

Do let us know where you find one. You won't be the last to break one.

 

• Aug 16, 2015

• #11

Boom Boom

Hold my beer. Watch this.

Jul 16, 2010

16,834

Carroll

Best local places are Ace Hardware and Tractor Supply.

 

• Aug 16, 2015

• #12

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

Lowes and Home Depot had the same ones. Only 20mm long. I'll try ace tomorrow morning


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• Aug 19, 2015

• #13

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

Fastenal in cockeysville only had 25mm long. This is harder than I thought. Lol. Haven't made it to ace yet though


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• Aug 19, 2015

• #14

BigDaddy

Ultimate Member

Feb 7, 2014

2,235

You could try calling Bushnell http://bushnell.com/global/customer-service

 

• Aug 19, 2015

• #15

Pinecone

Ultimate Member

MDS Supporter

Feb 4, 2013

28,175

Call Bushnell.

Call Brownells.

Check with lobby shop. RC cars and helicopters use metric hardware.

I use Microfasteners and RTL Fasteners for my small metric fastener needs

https://www.microfasteners.com/

http://rtlfasteners.com/

 

• Sep 18, 2015

• #16

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

Sorry it's been awhile since update. Since the screw broke in half I needed a new mounting clamp also. Called bushnell and they sent me a new bolt and mounting clamp. Think it was about $9 including shipping. Had no luck in finding the right bolt anywhere , so if this happens to you you're better off just calling bushnell and ordering parts


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• Sep 18, 2015

• #17

iH8DemLibz

When All Else Fails.

Apr 1, 2013

25,396

Libtardistan

ACE in Cockeysville has a Gunsmith Screw section.

 

• Sep 18, 2015

• #18

P

PapiBarcelona

Ultimate Member

Jan 1, 2011

7,361

Its tough to find small thread, short length standard and metric screws with the right head locally. McMaster, MSC are some of the best places but usually you can't just order 1 of them. They come in boxes of hundred, etc.

The big box stores have 6-32, 8-32, etc. but once you get 4-40 and some of the small metric, good luck.

 

• Sep 18, 2015

• #19

94hokie

Active Member

Mar 29, 2015

832

Severna Park, MD

For metric bolts try these guys.

http://mdmetric.com/index.html

 

• Sep 18, 2015

• #20

cotman68

Active Member

Feb 21, 2010

797

Stewartstown, Pa

iH8DemLibz said:

ACE in Cockeysville has a Gunsmith Screw section.

Click to expand...

I tried there , they don't carry the correct size. Also tried Home Depot , lowes and fastenal


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