PSI Woodworking L5818 Lathe Headstock Spindle Adapter 5/8" Shopsmith to 1" x 8tpi
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Availability:
In Stock.
Arrives
Wednesday, Mar 4
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Size: Shopsmith 5/8" to 1" x 8tpi
Features
- Convert a Shopsmith 5/8" non-threaded lathe headstock spindle to 1" x 8tpi threaded
- Allows a 5/8" non-threaded spindle to accept 1" x 8tpi threaded chucks, faceplates, and other woodturning tools and accessories
- Made of steel; Weighs .65 pounds; Extends spindle length approximately 1-1/4"
- Includes set screw to lock the adapter to the spindle
- Flats allow for solid wrench tool grip for tightening and loosening from spindle; Wrench not included
Description
Converts your Shop Smith lathe spindle so that you can use chucks with a 1" x 8 tpi thread size. Adapts to your 5/8-inch no thread spindle to accomodate any 1" x 8 tpi female mount accessory. Made of steel, and has set screw to tighten to the flat on the spindle. Extends the spindle length over 1-inch. From the Manufacturer Converts your lathe spindle so that you can use a chuck with a different thread size
Brand: PSI Woodworking
Material: Alloy Steel
Item Diameter: 1 Inches
Compatible Devices: Drilling Machine, Grinding Lathe, Milling Machine
Thread Size: 1 x 8tpi
Capacity: 1 Inches
Included Components: Spindle Adapter
Global Trade Identification Number: 98
Manufacturer: PSI Woodworking
UPC: 689076537698
Part Number: L5818
Item Weight: 9.9 ounces
Product Dimensions: 4.5 x 2.5 x 2.5 inches
Item model number: L5818
Size: Shopsmith 5/8" to 1" x 8tpi
Style: Headstock Spindle Adapter
Item Package Quantity: 1
Cutting Diameter: 1 Inches
Batteries Required?: No
Warranty Description: 2 Years Under Normal Use
Date First Available: November 10, 2006
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Mar 4
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 3/4" X 16tpi to 1" x 8tpi
Fits my lathe well. And fits in my chuck. Would recommend. Gets the job done!
Reviewed in the United States on August 25, 2025 by Kentman
Size: 3/4" X 16tpi to 1" x 8tpi
well made
Reviewed in the United States on January 17, 2026 by Charles
Size: 3/4" X 16tpi to 1" x 8tpi
Perfect fit, works great!
Reviewed in the United States on December 11, 2025 by Skyblue50
Size: 1-1/4" x 8tpi to 1" x 8tpi
The above picture of this adapter doesn't do it justice. I was surprised at the quality. This item is a large, heavy weight, finely machined and polished spindle adapter. Both ends screws on smooth. It's top quality at a price that's cheaper than PSI (Penn State Industries), sales it for. And a lot cheaper than other adapters are sold for. View my photos for more detail. It turns true and on center. It doesn't have set screws to lock it to the spindle for reverse operation, but I can drill and tap a couple of holes for set screws if it becomes necessary. It has a solid core on the male threads so you can't use a vacuum chuck. On the female end there are two flat spots for a wrench if necessary. I use an 'Adjustable Slip & Lock - Plumbers Nut Wrench,' its cheap light weight and can accommodate the large size of the adapter (search Amazon # TW408302). The adapter does jamb tight against the chuck and/or spindle so the wrench might come in handy. The nut wrench is also sold at local home improvement centers. This adapter screwed nicely onto my lathe's spindle, right over the shoulder of the spindle to mate with the shoulder of the adapter, as if it was made specifically for my lathe. I did read a magazine Q & A article where someone said their adapter didn't screw on far enough to seat onto the shoulder of the spindle and was asking if he could use a stack of large washers to fill in the gap. The answer was - not a good idea to use washers from the hardware store due to variation in hole ID and thickness from one washer to another. It was suggested to use 'Anti-Lock Lathe Spindle Washers' to fill in any gaps (search Amazon, about $2). Maybe this might help others, but it was not an issue with my lathe. Specs: OD at female end: 2 1/16" Depth of female pocket: 1 1/2" Depth of shoulder inside female pocket: 1/4" Length of male threaded end: 1" Total length: 2 3/4" Wrench size to fit flats: 1 13/16" Weight: 1 lb. 4.8 oz. [See my photos for more detail.]
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Reviewed in the United States on May 18, 2010 by Jeff Jeff
Size: 1-1/4" x 8tpi to 1" x 8tpi
Works well and I use it often.
Reviewed in the United States on August 29, 2025 by WG
Size: 1-1/4" x 8tpi to 1" x 8tpi
I bought this adapter when I upgraded from an (very) old Delta lathe with 1 x 8 treads to a newer Jet 1824 electronic variable speed lathe with a 1 1/4 x 8 spindle. I had a large collection of faceplates, including some that were made into vacuum chucks that fit on the Delta spindle but not the Jet. It probably would have cost more than $150 to replace all these faceplates. Instead, I purchased this adapter. It also let me use the new lathe to finish a couple of projects that were in progress. The adapter was much more substantial than I expected for the price. In general, it seems very well made. I had two issues with it, both of which could be addressed with minor modifications. First, when I initially mounted a faceplate to the adapter and then to the late, I had a lot of wobble in the faceplate. At first I thought that the adapter was non-concentric. But the problem was that the thread on the PSI adapter bottomed out on the female threads of the faceplate and prevented the shoulder of the adapter mating with the shoulder of the lathe spindle. The wobble was reduced very significantly by making a 3/16 inch plywood spacer and mounting it between the adapter and the faceplate. It still has a minor wobble, but I am not sure if that is the result of the lathe spindle, the adapter or the faceplate. If the PSI adapter had been manufactured with a slightly shorter threaded portion use of a spacer would not have been necessary. Secondly, this adapter is solid, and therefore cannot be used as is with a vacuum chuck. I solved this problem by drilling a 3/8 inch hole down its length. The adapter is not hardened so its easy if you take your time. I was able to get a different spindle adapter for my Teknatool G3 chuck, so I will not be using this PSI adapter for use on the 4 jawed chuck. I think that changing out the chuck adapter is probably much better that use of this PSI adapter with a chuck, both because of concentricity and because the headstock to bowl distance is as short as possible. Overall I am satisfied with this purchase.
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Reviewed in the United States on June 22, 2015 by Phycophile
Size: Shopsmith 5/8" to 1" x 8tpi
I can't speak for any other shopsmith users but I've found that I really, really hate the vibrations that the Mark V does as a lathe, I wish it would work for the size of swing that it has, with that said, I use a mini lathe to rough out my bowls then the Mark V with a NOVA four way to do the inside. This product worked perfectly. The four jaw from Shop Smith was something like $190.00 plus shipping. The NOVA and this was something like $80.00 plus shipping. Way cheaper, and just as effective. One thing I would recommend: If you do get the NOVA chuck with this, put a disc sanding plate on the side that the band saw typically goes. The rotations tend to make the chucks really cease down on here and it's nice to have that leverage of the disc sanding plate to remove the chuck off of here much easier.
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Reviewed in the United States on April 7, 2013 by wealy
Size: 3/4" x 10tpi to 1" x 8tpi
I bought this used, and I received what looked like a brand new part! The adapter is a heavy beast and sturdy, so it's very stable. Description is accurate. In cause anyone was wondering, The bore inside the adapter does not go all the way through and the opening is on the skinny side. The thicker side lines up perfectly with my wood lathe chuck and once on there, it's really hard to get off unless you put on some kind of anti thread lock (works out for me).
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Reviewed in the United States on June 6, 2023 by Craig Saunders