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PSI Woodworking

PSI Woodworking LA3418X Lathe Headstock Spindle Adapter 3/4" x 16tpi to 1" x 8tpi

    • Based on 1,884 reviews
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Availability: 19 left in stock
Fulfilled by Amazon
Arrives Thursday, May 16
Order within 2 hours and 43 minutes
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Size: 3/4" X 16tpi to 1" x 8tpi


Features

  • Convert a 3/4" x 16tpi lathe headstock spindle to 1" x 8tpi
  • Allows a 3/4" x 16tpi threaded spindle to accept 1" x 8tpi threaded chucks, faceplates, and other woodturning tools and accessories
  • Made of steel
  • Weighs .2 pounds
  • Flats allow for solid wrench tool grip for tightening and loosening

Description

Convert a 3/4" x 16tpi lathe headstock spindle to 1" x 8tpi. Allows a 3/4" x 16tpi threaded spindle to accept 1" x 8tpi threaded chucks, faceplates, and other woodturning tools and accessories. Made of Steel. Weighs .2 pounds. Flats allow for solid wrench tool grip for tightening and loosening.

Brand: PSI Woodworking


Material: Alloy Steel


Item Weight: 0.2 Pounds


Compatible Devices: Lathe


Included Components: Spindle Adapter


Manufacturer: ‎PSI Woodworking


Part Number: ‎LA3418X


Item Weight: ‎3.2 ounces


Package Dimensions: ‎3.15 x 2.87 x 1.97 inches


Item model number: ‎LA3418X


Size: ‎3/4" X 16tpi to 1" x 8tpi


Material: ‎Alloy Steel


Item Package Quantity: ‎1


Included Components: ‎Spindle Adapter


Batteries Required?: ‎No


Warranty Description: ‎2 Years Under Normal Use


Date First Available: June 30, 2020


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, May 16

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.

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Top Amazon Reviews

    • Works great
Size: 1-1/4" x 8tpi to 1" x 8tpi
I got a new lathe that has a 1.25 in spindle and all my chucks are 1 inch. This screwed right on the new spindle so now I can use my old chucks when I want to. No problems.
Reviewed in the United States on June 19, 2023 by JBS
    • Perfect fit for my shopsmith and nova chuck
Size: Shopsmith 5/8" to 1" x 8tpi
This is a high quality adapter that fits perfectly. Not sure anything else needs to be said
Reviewed in the United States on November 18, 2023 by Stephanie Reynolds
    • just what I needed
Size: 3/4" X 16tpi to 1" x 8tpi
Had to adapt 3/4-16 to 1"-8 on Lathe chuck. Does not have any wobble or run out, worked perfect
Reviewed in the United States on September 15, 2023 by Amazon Customer
    • Good Quality, Great Price
Size: 1-1/4" x 8tpi to 1" x 8tpi
Review Image by Jeff Jeff
Review Image by Jeff Jeff
Review Image by Jeff Jeff
Review Image by Jeff Jeff
Review Image by Jeff Jeff
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 Jeff
    • Heavy adaptor with good concentricity that can be improved with a few modifications.
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
    • Perfect adapter for a shopsmith
Size: Shopsmith 5/8" to 1" x 8tpi
I use this on my shopsmith to use standard 1” 8tpi attachments. Works perfectly
Reviewed in the United States on November 30, 2023 by J. Russo
    • Great quality
Size: Shopsmith 5/8" to 1" x 8tpi
Fits as it should, works flawlessly.
Reviewed in the United States on February 23, 2023 by Amanda
    • Extra heafty, extremely sturdy!
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). ... show more
Reviewed in the United States on June 6, 2023 by Craig Saunders

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