I have several of these available. Asking $12, but make me an offer. This coupling is a high-precision, zero backlash, lasercut "HELICAL" brand shaft coupling. Perfect for connecting a stepper motor to a CNC router or milling machine axis drive screw. Dimensions are as follows:

Material - Aluminum

Bore - 1/4" on both ends

Diameter - 7/8"

Length - 1.05"

Screws - #6-32 SHCS

Finish - Grey Anodize

The bore can be increased to a maximum of 5/16" (8mm). I am able to machine the bore for an additional $5.00 per coupling. I have up to a few hundred available. Regarding offers, I am more inclined to accept lower offers if the quantities are higher.

SHIPPING

Shipping will be a flat cost of $5.50 via USPS Priority Mail for buyers in the United States.

All other countries, shipping is a flat rate of $14 via Priority Mail International (up to 4 lbs). I will only ship to countries that Priority Mail International goes to. If your country doesn't have this, you cannot purchase this item.

Multiple items

United States Buyers - I will ship as many as you buy for a flat rate of $5.50 for the shipping!
International Buyers - I will ship as many as I can fit in a single Priority Mail International Small Flat Rate Box or Flat Rate Envelope. If you buy more than what can fit in either of these, I will need to increase the shipping charge..

TERMS

Paypal or USPS Money Order is the only acceped for of payment. Please read the item description, view the picture, and ask any questions before purchasing. Due to the nature of this item, it is sold "as-is." No returns are accepted. I will make every effort to ship the item quickly, but due to my busy schedule, it may take me up to 5 days to ship this item. Item will be well packed. Any damage incurred during shipping is not the responsibility of the seller.