100 oz silver bars: the low-premium heavyweight

The 100 oz silver bar is the largest size most private buyers ever handle. Above it come the industrial and good-delivery bars of around 1,000 oz, which are traded between banks and vaults rather than across a dealer’s counter. For someone who wants a meaningful amount of silver at the lowest cost per ounce, the 100 oz bar is often the logical choice. It also comes with trade-offs that smaller bars do not have.

What you are holding

• Weight: 100 troy ounces, which is about 3.11 kilograms of fine silver. In everyday terms, close to 6.9 pounds.
• Fineness: usually 999, meaning at least 99.9% silver.
• Format: almost always cast. Molten silver is poured into a mold and left to cool, which gives the bar its slightly rounded edges and irregular surface. Each cast bar looks a little different.
• Marks: refiner’s name or logo, weight, fineness and, on most bars, a serial number.

A 100 oz bar is roughly the size of a small brick, though the exact dimensions vary by maker. Silver’s lower density means it is much larger than a gold bar of the same weight.

Why the premium is low

The premium is the amount paid above the value of the metal. On silver it covers refining, fabrication, distribution and the dealer’s margin. Because casting a single large bar costs far less per ounce than striking a hundred small ones, the 100 oz bar carries one of the lowest premiums available for physical silver.

The pattern is the same everywhere, even though the actual figures vary by dealer, country and market conditions. Our pages on 1 oz silver bars and 10 oz silver bars explain the smaller sizes.

Who makes them

Many refiners and mints produce 100 oz bars, and older bars from discontinued brands still circulate. Well-known names on the secondary market include large refiners and national mints, while bars from historic makers such as Engelhard are sometimes sought by collectors and can command more than their metal value.

As with any bar, a recognized brand is easier to resell. An unknown or private-label 100 oz bar is more likely to be tested before a dealer makes an offer, and may be bought back at a lower price.

The drawbacks

You cannot sell part of it. A 100 oz bar is a single unit. If you need to raise a small amount, you have to sell the whole bar. Owners who think they may sell gradually often prefer several 10 oz bars, accepting a slightly higher premium in exchange for flexibility.

Weight and bulk. A few of these bars add up quickly. Storing several in a home safe or a bank box is possible, but they take up real space and real weight. See storing bullion bars for the options.

Shipping costs. Insured shipping of heavy parcels is expensive, both when buying and when selling. Collection in person or selling within a vault can avoid part of this.

Tax in some countries. In the European Union, investment silver does not enjoy the VAT exemption that investment gold does, so VAT, or a margin scheme, can add significantly to the cost of a new bar. Rules differ by country and change over time; our guide to buying silver bars covers the general picture. Check the current rules where you live.

Testing at resale. Because large bars are attractive to counterfeiters, some buyers test them with ultrasound or conductivity equipment before paying. Keeping the purchase invoice helps.

Checking a 100 oz bar

• Weigh it. A kitchen scale is not precise enough, but a scale accurate to the gram will confirm roughly 3,110 g. A large shortfall is a warning sign.
• Check the stamp against the refiner’s known designs and serial number formats.
• Look for signs of tampering, such as drilled holes that have been filled, or a surface layer that looks different from the rest of the bar.
• Buy from established dealers who test the bars they take back.

When a 100 oz bar makes sense

It tends to suit someone who is buying a larger quantity of silver, intends to hold for a long period, has adequate storage and is comfortable selling in large blocks. For a first purchase, or for someone who values flexibility, smaller bars or coins may fit better. Neither choice is right for everyone; the silver bullion prices page explains how to compare offers across sizes.

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