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Replacements for damaged spring/roll pins


EngineerEli

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So, while installing some go fast parts in my Stock III last night I buggered up some of the roll pins. Luckily I was either able to salvage them well enough, or have spares. I looked on LRA and they carry all the roll pins but charge $4 a piece which seems a little crazy...

Looking on McMaster-Carr you can get a package of 100 of most given sizes for between $4 and $12:

http://www.mcmaster.com/#standard-spring-pins/=wxqnd5

So my question is this. Does anyone know the actual sizes of each individual pin? Please feel free to fill in the below list in a reply.

Pin Size (M? X Length)

Trigger.......................................???

Trigger Bar................................???

Right side safety paddle...........???

Disconnector/Interrupter**........???

Hammer Strut**.........................???

Extractor....................................???

(** Are the disconnector and hammer strut pins the same?)

Second question. Tanfo seems to use 'coiled spring pins' for most of their pinned connections, these seem to me like they get deformed much more often than 'slotted spring pins.' Has anyone ever tried using slotted pins in place of the coiled ones in their Tanfo's or CZ's or any gun. Or know why one is generally chosen over the other?

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I'm learning things everyday here. And they say you can't teach an old dog new tricks. Wait, I mean "tricks" as in dog tricks- not human tricks.

PS: This wasn't the Great post that the Duke is waiting for in case anyone was confused, I just couldn't resist.

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Based on my measurements last night:

Pin Size (MM - DIA. X LENGTH)

Trigger....................................... 2.5X18

Trigger Bar................................ 2.5X8

Disconnector/Interrupter**........ 2.5X8

Hammer Strut**......................... 2.5X8

Extractor.................................... 2.5X15

Right side safety paddle........... 1.5X12

Available parts from McMaster Carr

Metric Slotted Spring Pins: http://www.mcmaster.com/#standard-spring-pins/=wzple0

Metric Coiled Spring Pins: http://www.mcmaster.com/#standard-spring-pins/=wzpmx0

If you look they show 2.5 dia. pins for both styles, the 1.5 dia. pins are only available from this site in the slotted pin form. Also, they offer stainless pins in addition to the standard blackened steel pins. Slightly weaker but I wouldn't be concerned. May look nice on the hard chromed guns! If one doesn't come in a length you need I would think you could order long and cut it to the needed size, but make sure you chamfer the edge you cut, or at the very least make sure you drive it in form the remaining chamfered end. But hey if you get a pack of 25 for less than 10 bucks, you can afford to mess arround with a few :cheers:

Disclosure: All shared information is based on my measurements and is a 'best guess' of the correct parts to use. Attempt at your own risk.

(not a lot of risk involved though, lol)

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The only pin I've ever had an issue with was the right side safety pin. For some reason they were a pain and I mushroomed quite a few before getting a pin to work in a few of my guns

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Here is an interesting data sheet form one of the spring pin manufacturers, just helps you understand how all the tolerances work and how much compression occurs when installing these pins. Also covers the clearance needed when drilling holes.

Coiled Spring Pins: https://www.spirol.com/library/sub_catalogs/cldp-Standard_Coiled_Pins_us.pdf

Slotted Spring Pins: https://www.spirol.com/library/main_catalogs/sltp_us.pdf

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I would do the coiled over the slotted.

Why? I would actually think the slotted are less prone to being damaged during installation and removal.

Can anyone chime in and say if CZ's or other manufacturers use coiled or slotted spring pins?

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Coiled Pins were invented to address the drawbacks of the Slotted Pins, and to offer the Design Engineer the flexibility to tailor the pin’s strength and flexibility to match the application.

The Coiled Pin is the most capable of absorbing shock and vibration after insertion, therefore providing prolonged useful life of the assembly.

Source

https://www.spirol.com/library/whitepapers/Pins_To_Max_Assembly_Life.pdf

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  • 8 months later...

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