Reducing Washer · 1 in x 1/2 Inch Knockout Reduction · RW100-50
Steel reducing washer for reducing a 1 in knockout or slip hole to 1/2 in on electrical enclosures and conduit terminations. Commonly used in commercial and industrial work where a listed steel reducer is needed for a clean, secure fit.
What this product is for
This steel reducing washer is used to reduce a 1 in trade size knockout or slip hole to 1/2 in on sheet metal enclosures, cabinets, boxes, and similar electrical equipment.
Use for
Use for adapting a larger enclosure opening to accept a 1/2 in conduit fitting, connector, or hub where a steel reducing washer is permitted by the equipment and installation method. Common in commercial and industrial panel work, junction boxes, and retrofit conduit entries.
Avoid for
Avoid using as a substitute for a reducing bushing, hub, or closure method where the raceway type, bonding path, enclosure construction, or local code requires a different fitting. Do not use where the opening is damaged or oversized beyond the washer's intended coverage.
Best for
Best for electricians reducing a standard 1 in opening to 1/2 in without changing the enclosure. Typical choice when maintaining a neat knockout reduction with steel fittings on indoor commercial or industrial work.
Installed in
Installed in steel enclosures, cabinets, pull boxes, junction boxes, and panelboards with a 1 in trade size opening. Approximate trade size conversion is 1 in to 1/2 in, or about 25.4 mm to 12.7 mm nominal trade size.
Why this product exists
It allows contractors to use an existing larger knockout while terminating a smaller raceway fitting, helping avoid enclosure replacement or field modification. This can simplify retrofit work and help keep conduit entries aligned.
Compared with similar products
Compared with reducing bushings, a reducing washer is used at the enclosure opening rather than in a threaded hub. Compared with field-made plates, it is a standard listed fitting commonly used for one-step knockout reduction. Actual suitability depends on enclosure type, bonding requirements, and local electrical code.
Specifications
- Product type: Reducing washer
- Trade size: 1 in x 1/2 in (25.4 mm x 12.7 mm nominal)
- Material: Steel
- Application: Reduce knockout or slip hole to a smaller trade size
- Typical use: Commercial and industrial electrical installations
- Compliance commonly listed by source examples: UL 514B, CSA C22.2, cUL on comparable RW100-50 listings
- ApplicationReduce knockout or slip hole to a smaller trade size | Commercial and industrial electrical installations
- Materialsteel
- Trade Size1 in x 1/2 in (25.4 mm x 12.7 mm nominal)
- BrandsWhite Label
- Stock in Elmira62
- Stock in Flesherton51
Aptico Supply Delivery
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Local delivery routes, pickup options, and contractor-focused service from our Elmira and Flesherton locations.
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Aptico Supply helps electricians, contractors, and commercial buyers get the electrical materials they need without unnecessary delays. Whether you are ordering for a jobsite, restocking service inventory, or arranging pickup, our delivery options are designed to keep work moving.
Free Daily Delivery
Free daily delivery is available for larger contractor accounts.
- Order by 9:00 AM for morning delivery
- Order by 2:00 PM for afternoon delivery
- Available in qualifying local delivery areas
Free Weekly Delivery
Free weekly delivery is available for smaller accounts in select service areas.
- Elmira area delivery: Tuesday
- Flesherton area delivery: Thursday
- Order by 11:00 AM on the route day
Pickup Options
Pickup is available from our Ontario locations for customers who prefer to collect their order directly.
- Elmira pickup available
- Flesherton pickup available
- Call ahead for large or special-order items
Local Delivery Areas
See our local delivery coverage below. Delivery charges may apply outside regular route areas or for oversized items.
Delivery Questions
Do you offer free delivery?
Yes, free delivery is available for qualifying contractor accounts and selected local delivery routes.
Can I pick up my order?
Yes, pickup is available from our Elmira and Flesherton locations.
Do delivery charges apply?
Delivery charges may apply outside regular local routes, for smaller orders, or for oversized and heavy items.
Can you deliver to jobsites?
Yes, jobsite delivery may be available depending on the order size, location, and delivery schedule.
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