---
product_id: 15165803
title: "PSI Woodworking LA11418 Lathe Headstock Spindle Adapter 1-1/4\" x 8tpi to 1\" x 8tpi"
brand: "psi woodworking"
price: "$65.13"
currency: USD
in_stock: true
reviews_count: 13
category: "Psi Woodworking"
url: https://www.desertcart.us/products/15165803-psi-woodworking-la11418-lathe-headstock-spindle-adapter-1-1-4
store_origin: US
region: United States of America
---

# 1.5" spindle extension Thread size conversion 1-1/4" to 1" Precision steel build PSI Woodworking LA11418 Lathe Headstock Spindle Adapter 1-1/4" x 8tpi to 1" x 8tpi

**Brand:** psi woodworking
**Price:** $65.13
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your lathe game—convert, extend, and conquer with precision!

## Quick Answers

- **What is this?** PSI Woodworking LA11418 Lathe Headstock Spindle Adapter 1-1/4" x 8tpi to 1" x 8tpi by psi woodworking
- **How much does it cost?** $65.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/15165803-psi-woodworking-la11418-lathe-headstock-spindle-adapter-1-1-4)

## Best For

- psi woodworking enthusiasts

## Why This Product

- Trusted psi woodworking brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Wrench-Ready Flats:** Built-in flats ensure secure tightening with standard wrenches—no slipping, no fuss
- • **Precision Machined Fit:** Smooth threading and true-on-center alignment for flawless operation every time
- • **Extended Spindle Length:** Adds approximately 1.5" to your spindle for enhanced tool fitment
- • **Heavy-Duty Steel Construction:** Engineered from solid steel for durability and long-lasting performance
- • **Universal Thread Compatibility:** Seamlessly convert 1-1/4" x 8tpi spindle to 1" x 8tpi for versatile chuck use

## Overview

The PSI Woodworking LA11418 Lathe Headstock Spindle Adapter is a robust steel accessory that converts a 1-1/4" x 8tpi lathe spindle to a 1" x 8tpi thread, enabling compatibility with a wider range of chucks and tools. Weighing 1.35 pounds and extending spindle length by 1.5", it features wrench flats for easy tightening and ensures smooth, true-on-center operation. Ideal for woodturners seeking versatile, durable, and precise spindle adaptation.

## Description

Product Description The PSI Woodworking LA11418 Headstock Spindle Adapter converts your lathe spindle so that you can use a chuck with a different thread size. Converts a spindle thread of 1-1/4" x 8 tpi to a 1" x 8 tpi male thread. Made of steel. Has flats to allow you to use a wrench when tightening. Permits the use of different size accessories on your lathe spindle. Extends the spindle over 1-inch. From the Manufacturer Converts your lathe spindle so that you can use a chuck with a different thread size

Review: Good Quality, Great Price - 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 desertcart # 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 desertcart, 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.]
Review: Good product - Fits my lathe well. And fits in my chuck. Would recommend. Gets the job done!

## Features

- Convert a 1-1/4" x 8tpi lathe headstock spindle to 1" x 8tpi
- Allows a 1-1/4" x 8tpi threaded spindle to accept 1" x 8tpi threaded chucks, faceplates, and other woodturning tools and accessories
- Made of steel; Weighs 1.35 pounds; Extends spindle length approximately 1-1/2"
- Flats allow for solid wrench tool grip for tightening and loosening from spindle
- Wrench not included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KIADBS |
| Best Sellers Rank | #346,372 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #236 in Power Lathe Accessories |
| Brand | PSI Woodworking |
| Brand Name | PSI Woodworking |
| Capacity | 1 inches |
| Compatible Devices | Lathe |
| Customer Reviews | 4.7 out of 5 stars 2,075 Reviews |
| Global Trade Identification Number | 00689076537995 |
| Handle Type | keyed |
| Included Components | Spindle Adapter |
| Item Diameter | 1.25 Inches |
| Item Type Name | lathe shaft adapter |
| Item Weight | 1.35 Pounds |
| Lock Type | Manual, Independent |
| Manufacturer | PSI Woodworking |
| Manufacturer Part Number | LA11418 |
| Manufacturer Warranty Description | 2 Years Under Normal Use |
| Material | Steel |
| Material Type | Steel |
| Model Number | LA11418 |
| Thread Size | 1-1/4 x 8tpi to 1 x 8tpi |
| UPC | 689076537995 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** PSI Woodworking
- **Material:** Alloy Steel
- **Item Diameter:** 1.25 Inches
- **Item Weight:** 1.35 Pounds
- **Compatible Devices:** Lathe

## Images

![PSI Woodworking LA11418 Lathe Headstock Spindle Adapter 1-1/4" x 8tpi to 1" x 8tpi - Image 1](https://m.media-amazon.com/images/I/51UF6O9IjeL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Quality, Great Price
*by J***F on May 18, 2010*

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.]

### ⭐⭐⭐⭐⭐ Good product
*by K***N on August 25, 2025*

Fits my lathe well. And fits in my chuck. Would recommend. Gets the job done!

### ⭐⭐⭐⭐⭐ You can use your old 1 inch chuck on a 1 1/8 inch headstock!
*by P***S on June 1, 2026*

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.

## Frequently Bought Together

- PSI Woodworking LA11418 Lathe Headstock Spindle Adapter 1-1/4" x 8tpi to 1" x 8tpi
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-09*