Replacement O ring for Lyman size die?

[imashooter2]

OK, I'm properly ashamed for not knowing off the top of my head...

What size O ring do I need to replace the one I just buggered up tonight? I'd prefer to have a hard number than try to match it up out of the 1,287 plastic trays at the Home Depot.

ETA the answer:

9/16 x 11/16 x 1/16
O ring size #35

[boogerred]

damned if i know.my hardware store only has about 5 drawers with about 10 compartments each. i usually have to do the "maybe this one will work" route.

[bravokilo]

When I needed one for a die I made I just removed a good one and went to the local "Hardware Hank" and had them match it up. Then I bought a bunch of them!!!

BK

[imashooter2]

Unfortunately, the Home Depot is my hardware store now. They have individual trays of individually plastic wraped rings. That makes them a pain to try and match to the one you are wearing on your thumb.

Somebody has this info...

[slughammer]

Harbor Freight has these kits with a bazillion O rings, one of them is bound to fit. Buy the kit and have a low quality O ring in every size you may ever need.

Barring that, are you sure you need the O-ring? Does it leak without?

[imashooter2]

Yeah, it leaks with the ring at the spot I cut it in half.

I like having stuff like that O ring kit on the shelf. Well worth the money spent if it saves you once on a Sunday afternoon. But Harbor Freight's shipping on low buck stuff like that is too spendy. I'll have to wait till I get something else to order.

Gotta tell you, my faith in the board is shaken. I thought for sure one of the old heads would have posted the info by now...

[wills]

Considered e mailing lyman about the O ring?

[imashooter2]

Considered e mailing lyman about the O ring?

Never crossed my mind... When you're thirsty, you go to the well! How was I to know the well was dry? :smile:

I guess I'm going to have to go answer this one for myself.

[StarMetal]

I called RCBS about those o rings one time and they mailed me out a bunch.

Joe

[454PB]

I make my own sizing dies for my Lyman sizer, and I learned long ago that the O-ring was unnecessary. I don't even machine the groove for it anymore, although I did for the first few. I'm a little surprised to hear that yours leaks without it, none of mine do. I don't know if this helps, but the diameter of the die in the portion where the O-ring lives is .723". I'd guess the groove for the O-ring is about .040 deep.

[StarMetal]

454pb

Do your Lyman sizers have the nut retainer or the older ones with the thumb screw that locks the die? If you have the old type without the retaining nut I don't believe you.

Joe

[bravokilo]

I remember reading a thread a while back where somebody contacted Lyman for a size and were told it was a "special" size. I don't think they will be much help.

BK

[454PB]

Actually, I have two.....a 45 and a 450. They both have the threaded retaining nut.

[imashooter2]

Actually, I have two.....a 45 and a 450. They both have the threaded retaining nut.

Well mine has the set screw, and please believe me when I tell you, the O ring is required.

[StarMetal]

Yeah I was going to say the ones without the retaining nuts leak.

Joe

[7br]

I have problem with leaking at the other end. As long as the sizer is empty, what size is on the threaded rod going through the reservior? Going to Home Depot tomorrow anyway.

[StarMetal]

7br,

Have you told your doctor about that? Oh oh you're talking about the sizer...hehehehehehe just kidding pardner. Just take your threaded reservoir shaft with you when you go.

Joe

[beagle]

Lyman sells the O-rings for $.25. You'll have to have one of the customer service people dig for the number as it's not readily listed last time I looked.

I have the number somewhere and if I find it, i'll post it./beagle

[StarMetal]

Like I said RCBS will give them to you free.

Joe

[Shepherd2]

Last time I needed a O ring I emailed Lyman asking how to get some and they just mailed me a few.

[454PB]

So how old are the ones with a set screw? My model 45 is 32 years old.



Here's a picture of some homemade dies.

[imashooter2]

So how old are the ones with a set screw? My model 45 is 32 years old.



Here's a picture of some homemade dies.

My father bought the one I use in the 50's.

[454PB]

I took an O-ring off of one of my Lyman sizing dies today and did some measuring. Using a vernier caliper, I measured the diameter of die inside the groove the O-ring fits in at .605". Measuring the larger diameter at that point it's .721, and the O-ring is about .065 in cross section. It's a little tough to measure a rubber O-ring, but that's pretty close. If you do a little subtraction, it comes out about right: .721" minus .605" equals .116". A .065 cross section times 2 equals .130". The O-ring is stretched some when in place.

I also notiticed that BOTH of my Lyman sizers are 450's. The only difference is the design of the handles.

Unless you have a lot of time on your hands to spend in a hardware store, it's probably easier to order them.

[Dye]

ihsmashooter2
Take your old O ring to a NAPA Store and ask them for a 4 SEASONS auto A/C part
#24110. It is the same or close to a new Lyman O ring
Be carefull Dye

[slughammer]

I measured the diameter of die inside the groove the O-ring fits in at .605". Measuring the larger diameter at that point it's .721, and the O-ring is about .065 in cross section. It's a little tough to measure a rubber O-ring, but that's pretty close. If you do a little subtraction, it comes out about right: .721" minus .605" equals .116". A .065 cross section times 2 equals .130". The O-ring is stretched some when in place.


From these measurements I would have to say its 9/16 x 11/16 x 1/16. Available at McMaster Carr for $2.04 per hunert.

[imashooter2]

OK then, 9/16 x 11/16 x 1/16 it is.

Will advise after procurement.

[RANGER RICK]

[QUOTE=imashooter2]OK then, 9/16 x 11/16 x 1/16 it is.

Will advise after procurement.[/QUOTE


Don't bother going through lyman . I was going to get a very small part for my 450 .$1.00 for the part from lyman and four dollars shipping . Their parts dept has very unfriendly people .

Sice I need the part I am going to have to take it in the pants. It's almost like buying on E-bay .

RR

[imashooter2]

Final answer:

9/16 x11/16 x 1/16
O ring size #35

Write it down! :smile:

[AZ Pete]

Thanks imashooter2

[imashooter2]

Don't thank me, I just went out and bought some... I made everybody else do the work! :rolleyes:

[NVcurmudgeon]

For the other Lyman 450 O-ring, the one that there is a pair of on the lube piston, I got them at Ace Hardware. I disremember the size, but I took my piston with me. Lyman has been very good to me, but it was a lot easier to get a part locally that costs only a few cents.

[imashooter2]

For the other Lyman 450 O-ring, the one that there is a pair of on the lube piston, I got them at Ace Hardware. I disremember the size, but I took my piston with me. Lyman has been very good to me, but it was a lot easier to get a part locally that costs only a few cents.

No O rings on the piston of my old 45. It has a brass skirt on the piston that does the sealing. Don't know if all the 45's are like that, I've only ever had mine apart.

[StarMetal]

You can convert that old 45 Lyman that has the brass skirted piston to the newer o ring type.

Joe

[Four Fingers of Death]

They will spot it and give you the right size straight away as they are doing this sort of stuff all day long. Buy a half dozen spares, Murphys law will come into play and you will not break O rings as you have plenty. Hopefully, you will not break anything else instead.

[SharpsShooter]

No O rings on the piston of my old 45. It has a brass skirt on the piston that does the sealing. Don't know if all the 45's are like that, I've only ever had mine apart.


My lyman #45 piston is identical to yours. You ever have any trouble getting it to seal with softer lubes? Mine is a PITA. Lube squirts up around the sides and it is impossible to get it up to pressure. I finally took saran wrap and punched it over the pressure screw and then pressed the piston down until it engaged the threads and it sealed right up. I'm tempted to turn a groove for the O-ring, but need to measure body thickness first.

[imashooter2]

My lyman #45 piston is identical to yours. You ever have any trouble getting it to seal with softer lubes? Mine is a PITA. Lube squirts up around the sides and it is impossible to get it up to pressure. I finally took saran wrap and punched it over the pressure screw and then pressed the piston down until it engaged the threads and it sealed right up. I'm tempted to turn a groove for the O-ring, but need to measure body thickness first.


The only soft lube I've had in it was 50/50. That sealed just fine. My father used it with Lyman "Ideal" before that and he had no issues either. My skirt is basically a brass flat spring with a tongue that goes into a slot to form a continuous seal. When out of the press there is approximately 1/8 inch of gap between the spring ends. I have to compress the spring to get it into the lube reservoir, almost closing the gap completely. Is yours the same? Perhaps your spring has taken a set?

[Willbird]

I'm sorry but in todays world I'm not going to get on the wagon that says $4.00 to retrieve, package, and mail an item is "taking it in the pants" . people have gone far overboard with expecting things shipped for free.

What they are saying is "our time costs money, if you want/need things maybe combine them all in one order" if Lyman hired you to do the job if pulling parts and shipping them how many orders an hour would you complete ?? And what would you expect to be paid per hour ?? vacation days, ?? paid holidays?? sick days? health insurance ?? workmans comp?? unemployment ?? FICA ? Do the math, show me how they are getting rich giving it to you in the pants for $4.00 per shipment.

Bill

[imashooter2]

Who charges a flat fee for shipping? If you place a larger order, you pay more to ship it. It is well known that shipping is a profit center for most mail order houses. I don't have an issue with that. It's how capitalism works. They try to make money, I try to save money, if we arrive at a mutually acceptable price point we do business.

[Buckshot]

...........Just bought some size die O-rings from Enco. Size 016, $3.30/100. Fit perfectly. Free shipping on orders over $25, with the free shipping code number. Easy for me to get a $25+ order at a machine tool place!

............Buckshot

[357maximum]

My old lyman 45 has the brass insert too, It leaked a littlle too, I cleaned it up (big PIA )and lapped it with valve grinding compound, no more trouble. I hope to NEVER have to clean that thing again, ended up putting it in the oven to get all the slippery stuff out. Good as new only used ( gonna use that phrase on ebay when I clean the attic)