Stainless Bollards: 304 vs 316, Sleeves, Mounts and Crash Ratings
Updated · By the Cone to Curb editors
A stainless bollard is a short post of stainless steel, usually 4 to 6 inches across and 36 to 42 inches tall, that keeps cars off a walkway, storefront or door while looking good. Pick 304 stainless for most sites and 316 near salt water or de-icing salt, and decide early whether it only needs to look like a barrier or has to stop a vehicle, because that changes everything below the ground.
| Choice | Option | Good for | Watch out for |
|---|---|---|---|
| Grade | 304 stainless | Inland sites, covered areas | Rust spots (tea staining) near salt |
| 316 stainless | Coast, pools, roads that get salted | Costs more | |
| Build | Stainless sleeve over a concrete-filled steel pipe | Real stopping power with a stainless look | Sleeve is cosmetic; the pipe and footing do the work |
| Solid or thick-wall stainless | Decorative and light-duty | Thin walls dent | |
| Mount | Embedded in a footing | Any bollard meant to stop a car | Digging, utilities, cutting the slab |
| Surface base plate, anchored | Marking, guiding, deterring | Base plates shear off when hit hard | |
| Removable with in-ground receiver | Fire lanes, deliveries, events | Lost keys and caps; debris in the socket | |
| Retractable (manual or powered) | Gated drives, controlled access | Price and maintenance |
Decorative or crash-rated
Most stainless bollards in front of stores and offices are not rated to stop anything. They guide people and drivers and deter low-speed bumps. If a bollard has to stop a vehicle on purpose, it needs a crash rating from a test like ASTM F2656 (current edition F2656/F2656M-23), which drives a test vehicle into the bollard and measures how far it gets past:
| Part of the rating | What it tells you |
|---|---|
| Vehicle letters: C, PU, M or H | Small car, pickup, medium-duty truck (15,000 lb) or heavy goods vehicle |
| Speed number, for example M30, M40, M50 | Test speed in mph (M50 means a medium truck at 50 mph) |
| Penetration P1, P2, P3 | How far the front of the vehicle got past the barrier: P1 is about 3.3 ft or less, P2 up to about 23 ft, P3 up to about 98 ft. Older editions also had P4 |
A rating covers the exact tested design: the bollard, the spacing and the footing. A stainless sleeve slipped over a rated bollard keeps the rating only if the maker says so; a decorative bollard on a base plate doesn't get one by looking strong.
Spacing
For stopping cars, set bollards so the clear gap is narrower than a small car, commonly about 3 to 5 feet. Where people walk between them, keep at least 36 inches clear for an accessible route under the 2010 ADA Standards (32 inches is allowed for a short stretch up to 24 inches long). A gap that's both under 5 feet and at least 36 inches works for most storefronts.
To count bollards for a line: take the length, divide by the center-to-center spacing (clear gap plus one bollard width), round up and add one.
Finish and care
Brushed (No. 4) finish hides scratches and fingerprints better than mirror polish. Stainless still needs cleaning: road salt and grime left on the surface cause brown spotting, even on 316. Rinse a few times a year where salt is used. Ask whether the bollard has a cap, reflective band or LED ring if it stands where cars move at night.
Mistakes we see
- 304 next to the ocean or a salted lot. Expect staining. Choose 316 or plan to clean.
- Surface-mounted bollards protecting a storefront. They mark the line; they won't stop a car.
- Gaps too wide or too narrow. Over 5 feet lets cars through; under 36 inches blocks wheelchairs.
- Removable bollards without spare keys and caps. The sockets fill with water and grit.
What it costs
Ballpark U.S. prices in late 2026: $150 to $400 for a stainless sleeve or cover, $400 to $1,200 for a solid or heavy-wall stainless bollard, $500 to $1,500 for a removable one with its receiver, and several thousand dollars each for crash-rated systems, before installation. Footings and concrete cutting often cost as much as the bollards.
Where to buy
Bollard manufacturers and their dealers, site furnishing suppliers and security contractors for rated systems. Ask for the grade (304 or 316), the wall thickness, the mounting detail, and for any rated bollard, the test report with the rating and footing drawing.