Add-on Cast Iron Sash Weights

Manufacturer: SRS Hardware

Rated 5.00 out of 5 based on 2 customer ratings
(3 customer reviews)


Note: Due to the heavy nature of this item, a custom shipping quote for each order must be calculated.

$3.60 per pound

Please complete our weight request form and we will email you with a job quote.

SKU: AOW Category:


SRS Hardware has come up with a great new product, “Add-on Sash Weights”!

Have you ever been vexed by a lower sash that won’t stay open, or an upper sash that has a “mind of its own” and wants to slowly slip down?  This is a common and annoying phenomenon often caused when broken glass is replaced with slightly thicker (thus heavier) glass.  They are simple to install and do not require disconnecting your existing weights from the sash chain or cord.

Each SRS AOW (add-on weight) ½ pound weight consists of a 1-3/8” diameter cast iron body and a CNC machined steel taper pin. The body has a ½” diameter hole through the center and a slot along its length allowing it to simply slip onto the sash cord or chain without having to unfasten the existing weight. Dropping the taper pin into the top of the slot firmly locks the weight onto the chain. Multiple AOW’s can be stacked in order to arrive at the perfect weight. Once you have removed the weight pocket cover and have access to the sash cord, installing the weights takes under 10 seconds each. We have kept the diameter small to be certain that the weights are suitable for residential sash and will fit easily through narrow residential weight pocket covers.

AOW weights are offered in 10 piece cases.

SRS keeps plenty of cases in stock for immediate shipment.

Add On Weights Quotation Request

Enter number of cases

Additional information


$34.99 – $119.20

Case Size

AOW 10: .5lb weights, 10 pieces, $34.99
AOW 10 4: .5lb weights, 40 pieces $119.20


Cast Iron, Steel


All weights are 1-3/8” diameter


SRS Hardware

3 reviews for Add-on Cast Iron Sash Weights

  1. Chris C

    Encountered a situation where the pocket doors were too small to remove the weights, but the original weights were too light for the sash. These AOWs were a quick and easy solution to the problem. Their convenient design made it so that I could clip them right onto the sash cord without untying anything or removing the pulley; fantastic product!

  2. Rated 5 out of 5

    David C.

    Talk about convenience and ease of assembly! There’s a reason these sash weights are made to certain specifications…it’s to make your life easier, finish your jobs faster and minimize your last minute adjustments, resulting in a better adjusted well balanced sash. This is the result of a company being owned and operated by an actual career sash maker. I think it’s pretty cool being able to get stuff from a supplier who actually knows what they sell.

  3. Rated 5 out of 5


    I keep a pack of these weights in my truck at all times. Sometimes existing weights are just slightly off and these are the perfect fix. The problem with other add-on weights is that they are often square and don’t fit properly in some pockets. In addition, you need to disconnect the existing weight to add them on top. These guys here fit inside every pocket I have encountered and I do not have to disconnect the existing weight to add it. So tweaking during an install is quick and painless. I highly recommend you order some now. The day you realize that you need them you will be so very glad you have them. Nobody but SRS carries a product like this.

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Presentation Sheet

SRS Hardware Add On Weights Presentation Sheet

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Technical Sheet

SRS Hardware Add On Weights Technical Sheet

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"SRS Hardware is a one-stop-shop for window repair and restoration professionals and even DIY old window people. For someone who has to keep costs as low as possible, I've relied on SRS for their Sarco putty over the years and I still can't find it more affordably anywhere else."

-Nicholas Bogosian, Owner, Old Window Revival
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