Bolt thread help

[I Know Something]

Working on another person's Craftsman. And they needed a new cylinder. No problem. Ordered one. It wasn't tapped out in any hole. Went to the local hardware store. Got all but the muffler one. No idea what it is for thread. The bolt is part number 530 016338. Its been 9 days and Sears and Husqvarna both havnt responded. Sooo....anybody know?

 

[redline4]

Hardware store should have one of those metal or plastic plates that have threaded holes and studs to determine bolt sizes.

Otherwise need pitch guages and measure bolt.

 

[Czed]

M4 usually take it to a place with a gauge like
Tsc,bridgeport equipment, rural king, are cheap local places to get metric
auto parts store's more expensive.
Ebay amazon I've bought a hundred for 7.00

 

[I Know Something]

It slightly bigger the a 6, or more course then a 6 x 1 pitch. And slides into a 7. And all the places around here dont even have a bolt that fits into the original cylinders hole. Were just kind of stumped.

 

[Wilhelm]

What You are describing (larger and coarser that M6x1.0, but smaller than 7mm in diameter) can only be a 1/4" x 20 UNC or 1/4" x 28 UNF.

Or it is a really bad quality M6x1.0, but I doubt that.

I think I have a 1/4" thread cutter somewhere, if I find it I'll take measurements and pictures compared to metric M6x1.0

 

[Adirondackstihl]

1/4-28?

 

[old guy]

The proper bolts for those cyls. are self tapping.

 

[I Know Something]

What You are describing (larger and coarser that M6x1.0, but smaller than 7mm in diameter) can only be a 1/4" x 20 UNC or 1/4" x 28 UNF.

Or it is a really bad quality M6x1.0, but I doubt that.

I think I have a 1/4" thread cutter somewhere, if I find it I'll take measurements and pictures compared to metric M6x1.0

Already tried that. Not even close.

 

[Wilhelm]

Already tried that. Not even close.

Well, was worth a shot.

 

[Marshy]

Working on another person's Craftsman. And they needed a new cylinder. No problem. Ordered one. It wasn't tapped out in any hole. Went to the local hardware store. Got all but the muffler one. No idea what it is for thread. The bolt is part number 530 016338. Its been 9 days and Sears and Husqvarna both havnt responded. Sooo....anybody know?View attachment 176941 View attachment 176942

Is that the picture of the actual bolt?

 

[Al Smith]

Well an M7 would be an odd ball ,its .2755" an M6 is .236 1/4" of course it .250 .I wouldn't think it would be an M8 or 5/16".

 

[Al Smith]

I took the liberty of looking them up and they do make M7 bolts although I've never seen one M7 -1 meaning the tap hole would be M6 .Flea bay prices are not outrageous all things considered .I didn't look at McMaster-Carr but no doubt they have them also .

 

[Termitebuffet]

If it's like the 2800-3300,I'm fairly certain it's 1/4" -20

Sent from a potato

 

[I Know Something]

Is that the picture of the actual bolt?

Yes

 

[Chainsaw Jim]

Working on another person's Craftsman. And they needed a new cylinder. No problem. Ordered one. It wasn't tapped out in any hole. Went to the local hardware store. Got all but the muffler one. No idea what it is for thread. The bolt is part number 530 016338. Its been 9 days and Sears and Husqvarna both havnt responded. Sooo....anybody know?View attachment 176941 View attachment 176942

The muffler screw you have is self tapping.

 

[Wood Doctor]

The muffler screw you have is self tapping.

Yes, and usually that's an M5.

 

[I Know Something]

The muffler screw you have is self tapping.

I'm starting to believe it. I had to send the cylinder back. After cleaning off the powdery stuff coating the inside of it. The cylinder walls are pitted all over like a highly freckled person.

Oddly. This is the first cylinder I've had to replace in the nearly 20 years of working on other peoples random stuff. Hence why I didnt know. Thank you.

 

[I Know Something]

Yes, and usually that's an M5.

The bolt body inside the thread is larger then a M5. Weird.

 

[Al Smith]

--except for the fact the OP already said it was larger than M6 .An M5 and a number 10 screw are almost the same

 

[old guy]

I sent back a 5020 poulan cyl, it had dozens of pits in it, the one they replaced it with still had a couple, but was useable.