Product Overview
Isolantite Type 348 Ceramic Standoff Insulator, 6 Inches Long with a 1/4-20 Tapped Hole
Condition
New. The photographs show a cream colored glazed ceramic cylinder with the side marking NL523W04-048 printed in black and fully legible, sharp enough to read in a macro shot. The glaze is glossy and unbroken, with a lighter formed glaze line running the length of the body. The photographed end face is flat and slightly matte where the glaze stops, showing the natural speckled ceramic body, and a threaded hole sits centered in it with clean, undamaged thread crests. No chips, cracks, or handling marks are visible. Laid against the wooden inch rule the body measures approximately 6 inches long. The part is photographed bare, with no packaging shown.
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Product Overview
This is an Isolantite Type 348 cylindrical standoff insulator, approximately 6 inches long by 1 inch in diameter, with a 1/4-20 tapped hole approximately 5/8 inch deep and the side marking NL523W04-048 printed on the body. It is the plain, unfussy kind of ceramic post used to hold a conductor, buss bar, terminal board, or subassembly a fixed distance off a chassis or grounded panel while keeping it electrically isolated. The 1/4-20 thread means it mounts with ordinary hardware rather than a proprietary stud, and the ceramic body is chosen for jobs where a plastic spacer would creep under load or track over time. Additional product information from Isolantite: https://isolantite.com/products/light-duty-standoff-insulators/
Key Features
- Type: Isolantite Type 348 cylindrical standoff insulator
- Approximate dimensions: 6 inches long by 1 inch diameter
- Mounting: 1/4-20 tapped hole, approximately 5/8 inch deep
- Side marking: NL523W04-048, printed in black and legible
- Body: glazed ceramic, cream color, with a flat unglazed end face
- Condition: New
- Voltage, dielectric, and temperature ratings: not confirmed - verify against Isolantite data before use
Applications
- A radio amateur building a transmitter or amplifier chassis who needs a tall ceramic post to carry a buss bar clear of the deck
- A restorer rebuilding vintage transmitting or power supply gear who wants a ceramic standoff in place of a modern nylon spacer
- A panel builder holding a copper bar off a grounded backplate using standard 1/4-20 hardware
- A fixture or test rig builder who needs a rigid, non-conductive post that will not soften or take a set under clamping load
Frequently Asked Questions
What is the NL523W04-048 marking on the side?
That is the number printed on the body itself, shown clearly in the close-up photo. It is the marking to use when cross referencing this piece. Isolantite Type 348 is the type designation carried on this listing. We do not have a factory decode of the NL number beyond what is printed on the part.
Is it tapped on both ends?
What we can confirm is a 1/4-20 tap approximately 5/8 inch deep, and the photos show a clean threaded hole in the end face. A second tap on the opposite end is not confirmed here. If your mounting depends on both ends being tapped, ask us before ordering and we will look at the piece in hand.
What voltage will this insulator stand off?
Not confirmed. We do not perform dielectric or hipot testing, and no rating is printed on the body. Isolantite publishes information on its light duty standoff line at the link in the overview above - verify against their data before putting this in a live circuit.
How long a screw should I use?
The tap runs approximately 5/8 inch deep, so a 1/4-20 screw will bottom out around that depth. Size your screw to your panel thickness plus the engagement you want, and leave yourself a little short of bottoming so you are clamping the panel and not the end of the thread.
Why buy the three or four I actually need instead of a case lot?
Because a chassis takes the number of posts it takes. Buy one for a single repair, or four to carry a buss bar across a deck, or a dozen for a full rebuild - we have 46 in stock. That beats committing to a factory case of insulators you will be storing for the next decade. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Six inches of glazed ceramic with one number on its flank and nothing else to prove: no plastic to soften, no clever mechanism to fail. Bolt it down, lift your conductor off the deck, and let this be the part of the build you never think about again.
