Sprue Extenders

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Sprue Extenders

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5.0 average, based on 2 reviews


(Quantity discounts available)

Product Information
Quantity Discounts

Sprue extenders are useful for multiple purposes.  Standard sizes from 1 to 5 inches long.  Non standard lengths available upon request.  (at an additional charge)

$1 - Discount Per Piece at Qty 5 or more (any listed size (mix and match))
$2 - Discount Per Piece at Qty 10 or more (any listed size
(mix and match)

1.  Often a large bait in a mold with a short sprue and runner needs more plastic to draw upon as it cools.  A sprue extender expander increases the amount of plastic in the reservoir to the cavity.  
2.  A sprue extender can extend the height of molds so that you can easily inject multiple molds of different heights when clamping them together.  

  • The sprue extenders are machined to 0.630" for a depth of approximately .25 inches to accomodate many standard 5/8 inch (.0625) nominal size hand injecters.   
  • The nipple that fits into your mold is sized at 0.620" so that it should fit into most common hand injection plastisol bait molds. 
  • The nipple reaches approximately .25 inches into your mold sprue.  
  • The overall length is the advertised length plus the length of the nipple that goes into the mold.  ie) a 3 inch extender insert into a 3 inch mold will place the top at 6 inches.  
  • Nominal outside dimension is 3/4 inch (0.75").
  • Internal passage dimension (ID) is 1/2 inch (0.50").
  • The overall external finish is left as the stock came from the mill in order to keep costs down.
  • Other size sprue extenders can be made, but non standard sizes will cost a few dollars more.  
  • Sizes 1-3 inches long are all priced the same as machining is the majority portion of the cost.  Longer sizes cost more as deeper machining takes a couple extra steps.  



Product Code SPRKD27L91
Manufacturer CNC Molds N Stuff
Condition New
Weight 0.250lb

You can save money on this item when you purchase several at a time. The table below shows the minimum quantities required to benefit from this offer, and how much they'll cost.

Quantity Price per unit
5+ $12.95
10+ $11.95

Customer Reviews

Average Rating: 5

Superior Bump hog -2 cavity

1 2 3 4 5
Received this Aluminum mold today and it is a beautifully machined mold, crisp edges, nice detailing inside, I give it a 10 out of 10 Thank you! (02 Apr 2021, 11:42)

Perfect for molds that use a lot of plastic.

1 2 3 4 5
I couldn't find anything like these anywhere until now. These sprue extenders really help when injecting molds that tend to draw down a lot of plastic. Instead of having to top off the molds multiple times, I'll just use one of these on each mold and not have to worry about the mold drawing air as it cools. Each bait in each cavity now comes out perfect instead of having dents in the bait or air pockets at the head of the first bait. A must have for any molds that require a lot of plastic to fill or draw down a bunch after filling the mold. Great item and great prices. (03 Oct 2018, 19:17)
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