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Brass Metric Expansion (Freeze) Plugs


QualCast Expansion Plugs are produced from the highest quality steel in a wide variety of cup designs. For marine, performance, or heavy duty applications we recommend brass or stainless steel materials. We carry standard cup, shallow cup, and concave cup in all three materials, as well as in metric sizes.

Find individual specifications in the listings below.

NOTE: QualCast products ship directly from the QualCast warehouse to your door. Please allow additional time for processing and delivery.

NOTE: If a product is IN STOCK – quantities may be ordered as needed (meaning in singles or however many quantities you need.

If a product is NOT IN STOCK a minimum order quantity of 100 pieces will be applied.

Stock on these items is updated weekly, so quantities may fluctuate. Please call if there are any questions, or concerns.

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Order No. Description Price Quantity
QC9618MMCB 18mm Hole Dia. | 18.14mm OD | .250"H | 96-618MMCB $2.38
QC9620MMCB 20mm Hole Dia. | 20.24mm OD | .230"H | 96-20MMCB $2.40
QC9622MMCB 22mm Hole Dia. | 22.17mm OD | .290"H | 96-22MMCB $2.37
QC9625MMCB 25mm Hole Dia. | 25.27mm OD | .340"H | 96-25MMCB $2.03
QC9626MMCB 26mm Hole Dia. | 26.20mm OD | 96-26MMCB $2.28
QC9628MMCB 28mm Hole Dia. | 28.32mm OD | .360"H | 9628MMCB- $2.27
QC9630MMCB 30mm Hole Dia. | 30.25mm OD | .350"H | 96-30MMCB $2.30
QC96315MMCB 31.5mm Hole Dia. | 31.98mm OD | .440"H | 96-31.5MMCB $4.02
QC9632MMCB 32mm Hole Dia. | 32.23mm OD | .430"H | 96-32MMCB $4.02
QC9634.3MMCB 34mm Hole Dia. | 34.24mm OD | .470"H | 96-34MMCB $2.27
QC9635MMCB 35mm Hole Dia. | 35.38mm OD | .435"H | 96-35MMCB $2.03
QC9636MMCB 36mm Hole Dia. | 36.22m OD | 96-36MMCB $2.97
QC96365MMCB 36.5mm Hole Dia. | 36.75mm OD | .400"H | 96-36.5MMCB $4.02
QC9638MMCB 38mm Hole Dia. | 38.23mm OD | .370"H | 96-38MMCB $3.20
QC9640MMCB 40mm Hole Dia. | 40.41mm OD | .390"H | 96-40MMCB $2.80
QC96415MMCB 41mm Hole Dia. | 41.43mm OD | 96-41.5MMCB $4.23
QC96423MMCB 42mm Hole Dia. | 42.27mm OD | .515"H | 96-42.3MMCB $3.97
QC9645MMCB 45mm Hole Dia. | 45.42mm OD | .530"H | 96-45MMCB $5.68
QC9647MMCB 46.5mm Hole Dia. | 46.76mm OD | .330"H | 96-47MMCB $5.27
QC96472MMCB 47mm Hole Dia. | 47.22mm OD | 96-47.2MMCB $4.40
QC9650MMCB 50mm Hole Dia. | 50.42mm OD | .500"H | 96-50MMCB $6.35
QC965105MMCB 51mm Hole Dia. | 51.052mm OD | 96-51.06MMCB $4.02

More information


To return an item:
1. Write a brief note describing the reason for the return. Please be sure to include your name or company name or account number.

2. Return the item freight prepaid within 60 days from the invoice date. For best results, please ship return merchandise by UPS or Federal Express. Please keep your receipt because it may be necessary to track the package if it is lost in transit.

3. A 10% restocking fee applies on all returns unless the problem was the fault of Goodson. If so, the restocking charge is waived and shipping costs are reimbursed. Credits will be made to the account originally billed.

Send the completed Product Return Form along with the product to:

Goodson Shop Supplies
156 Galewski Drive
Winona, MN 55987

Read our complete return policy.


Goodson strives to ship orders the same day they are received. In fact, we track this on a daily basis and we are currently shipping 99.97% of orders on the same day.

We use most major carriers including FedEx, UPS, USPS and regional carrier, SpeeDee.

For more information, check out our Shipping & Delivery page.

International Sales

Goodson ships F.O.B. Winona, Minnesota, USA to most countries around the world. To find a distributor near you visit our Distributor Listing.

If there is not a distributor in your area, you can contact Goodson by phone (1-507-452-1830) or order online. Please note some items (such as Sunnen) are not available for shipping outside of the United States & Canada. If you have these items in your shopping cart, your order cannot be processed. You must remove those items from the cart to continue.

Proposition 65 Information

"Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm." -  

So, what does this mean for Goodson customers? It means that many of common products used in manufacturing contain products known to the state of California to cause cancer and/or reproductive harm. Components such as stainless steel, galvanized wire, brass, bronze, etc. can be found in the Prop 65 list and require us to provide the warning. 

You can find a complete list at the Proposition 65 website.

Proposition 65 WarningWARNING: Cancer and Reproductive Harm -

Customer Reviews

Based on 1 review
glenn beck
Brass expansion plugs

Got exactly what I needed