PSI Woodworking L5818 Lathe Spindle Adapter 5/8" Shopsmith to 1" x 8tpi | Lathe Headstock Woodturning Accessory
Condition: New
Buy Now, Pay Later
As low as
$3
/ mo
Learn more
- – 4-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Tuesday, Aug 25
Recently Viewed
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: Steel
Item Diameter: 1 inches
Compatible Devices: Drilling Machine, Grinding Lathe, Milling Machine
Thread Size: 1 x 8tpi
Brand Name: PSI Woodworking
Included Components: Spindle Adapter
Global Trade Identification Number: 98
Manufacturer: PSI Woodworking
UPC: 689076537698
Manufacturer Warranty Description: 2 Years Under Normal Use
Unit Count: 1 Count
Item Type Name: spindle adapter
Model Number: L5818
Manufacturer Part Number: L5818
Compatible Devices: Drilling Machine, Grinding Lathe, Milling Machine
Thread Size: 1 x 8tpi
Capacity: 1 inches
Handle Type: wrench
Lock Type: Set Screw
Item Diameter: 1 inches
Material Type: Steel
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Aug 25
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.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
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.]
...
show more
Reviewed in the United States on May 18, 2010 by Jeff
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: 1-1/4" x 8tpi to 1" x 8tpi
I bought this to use with my new lathe and my old lathes chuck. My chuck is made for a 1" by 8 tpi thread headstock and my new lathe has a 1 1/8" by 8tpi tread headstock. This allowed my to use my old chuck for now without spending more money on a new chuck. It is simple to use. It is heavy and quite rugged. The threading is well machined and smooth. It has good stability in use. It is a reasonable price for the value. I would buy it again. The only thing you can,t do is use a morse taper putting it through the chuck as it is solid (not an issue for me). It also reduces your maximum stock length on your lathe by a couple inches.
...
show more
Reviewed in the United States on June 1, 2026 by Pickles Picks
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
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.
...
show more
Reviewed in the United States on June 22, 2015 by Phycophile
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: 3/4" x 10tpi to 1" x 8tpi
Perfect fit for my old Central Machinery lathe
Reviewed in the United States on February 28, 2026 by Jules Pierpont