3120xp Muffler Screws?

[ddiesel2006]

Anyone have a P/N or size for the muffler screws for a 3120XP?

Got a brand new 3120XP with only a few tanks of gas through it and the muffler screws have vibrated loose. I'm mostly seeing the IPL diagrams with the stud style mounts, and found one thread mentioning the screws, but the P/N showed a short (1" or so) screw... Looks like they need to be about 2-3" long at least.

 

[cus_deluxe]

i think youll have to grab those from husky, they fit into slots on the ex flange, and i dont think a regular hex head bolt will fit.

 

[cus_deluxe]

 

[ddiesel2006]

This is the NEWER style 3120xp muffler that doesn't use studs; the holes next to the exhaust port on the cylinder are threaded, not slots for studs...

But I can't find that style in any of the parts catalogs online.

 

[RED-85-Z51]

Wonder if 350/353 bolts are the same

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[RED-85-Z51]

350 is 3.450" long flange to end

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[ddiesel2006]

Found some info... It's the lower left in this breakdown

 

[ddiesel2006]

And here's the parts list with numbers:

1	503 13 00 03	Muffler Assy
2	503 83 65 02	Muffler
3	729 53 40 01	Screw Ccrpant
4	503 13 08 01	Exhaust Duct
7	503 21 85 01	Screw
8	503 14 01 01	Support
10	725 53 68 55	Screw Ihscm2x
11	503 14 30 02	Muffler Assy
12	503 13 53 01	Support
13	505 41 79 04	Muffler Assy
14	505 41 79 02	Muffler Assy
15	505 42 01 01	Support
16	579 09 16 01	Screw Ehhm
17	725 53 27 55	Screw Ihscm
19	574 56 04 01	Screw Ehhm

 

[ddiesel2006]

So it looks like this is the part I need (or anyone else for future):

Product Code : 579091601
Manufacturer : Husqvarna / husqvarna.cz
Product description: SCREW EHHM M6x110 A4 BUMAX 88 SS

Looks like it's some fancy grade of stainless steel...

Bumax 88 and Bumax 109 are premium A4 fastener products in the Bumax family. It is known as a very consistent product that offers higher yield strength, lower amount of inclusions and tighter tolerances in chemical composition compared to standard A4 fasteners. As a result, Bumax 88 and Bumax 109 offers superior mechanical properties and fatigue resistance, better corrosion resistance in most environments and very low magnetic permeability. For our customers it means unmatched reliability and life expectancy in the harshest environments. Bumax 88 and Bumax 109 are made of the same material but due to a special manufacturing process, Bumax 109 offers higher strength and is the strongest A4 fastener on the market. Fasteners in the Bumax 88 class have strength properties that correspond to 8.8 carbon steel fasteners and Bumax 109 with 10.9 carbon steel.

 

[ddiesel2006]

Local dealer I just talked to wants $7.99ea + ship and won't be here for at least 10 days. Here are some other options for anyone who's looking:

As a bolt:
https://www.mcmaster.com/93635a265Tensile strength is only 100ksi vs. the Bumax-88 OEM one of 110ksi, but I don't think that's a huge deal.

And some fancy NORD-LOK washers:
https://www.mcmaster.com/91812A423
OR as a stud (threaded both ends):
https://www.mcmaster.com/92997A167Tensile strength only 85ksi, but can get more torque on it without worrying about stripping the threads in the cylinder.

 

[cus_deluxe]

wow, you did a lot of homework, great info! ive not seen any other style of cylinder than the 394/5 style. i have a new in box 3120, obviously havent looked at it much lol.

 

[Brent Nowell]

i think youll have to grab those from husky, they fit into slots on the ex flange, and i dont think a regular hex head bolt will fit.

Lol anyone ever tried extra long brass t bolts for a toilet hahaha. I bet it would work