How to Order from the McNichols Grating Catalog Without Wasting Money

There's no single “right” product in the McNichols grating catalog. There can't be. It's a catalog that has to cover everything from a $40 replacement panel to a custom-engineered platform system, which is exactly why it's easy to get lost in it.

I know what that feels like, because I've paid for it. I'm a project engineer who's been handling grating orders for about eight years, and I've personally made and documented 14 significant mistakes — roughly $38,000 in wasted budget. Now I maintain the spec checklist that keeps my team from repeating the worst of them.

If you're about to order grating and don't know where to start, use the same framework I give my new juniors. Figure out which of these three situations you're in:

• Situation A – Replacement: You're repairing an existing walkway, platform, or trench cover.
• Situation B – New design: You're specifying grating for new construction, or seriously changing the layout of an existing space.
• Situation C – Compliance: A safety review, an inspector, or a regulation is making you act.

Treating every order like it's the same problem is the most expensive habit in this industry. It's also the most common.

Situation A: Match the Product, Then Verify the Design

The natural instinct for a replacement is “just get the same thing that's there.” Good instinct. The mistake is stopping there.

In my first year (2016), I ordered replacement panels for a plant mezzanine. Same bearing bar size, same spacing, same material. The panels came in, we did the load deflection check, and they failed. The original contractor had under-specified the whole platform years earlier. My identical replacement was an identical mistake. That redo cost $3,200 and two weeks of downtime.

So for a replacement, look at the physical product, not just the old purchase order:

• Measure the bearing bar depth and center-to-center spacing. Write it down.
• Identify the type: welded, swaged, press-locked, or riveted.
• Check for a serrated surface. Plain bars get slippery when wet, and that's a red flag for a walkway with any foot traffic.
• Confirm the material. Galvanized steel and aluminum look similar once painted. (Don't ask me how I know.)

One more check: confirm you're actually replacing bar grating. Doorway transition plates — what some facilities teams call “door trim” — are a different product family, and they're not built to carry the same loads. Specifying heavy bar grating for a threshold job creates a trip hazard instead of fixing one.

Then, before you click “place order,” open the load table for that exact size and verify it works for your expected traffic. The old grating being installed doesn't mean it was ever adequate. Match the product. Verify the design. Do both.

Situation B: Load Tables, TCO, and the “Heavy Duty” Trap

For new construction, the load table is the real product. The photos in the catalog are just decoration. But the table is only useful once you know your requirement, so define that first: what load does this walkway need to carry, and what environment will it live in?

If you skip that step, you'll hit one of two traps. I've hit both.

The “heavier is better” trap

It feels right to over-spec. But “overkill” is just another way of saying “wasted budget.” I once put 2-1/4-inch-deep bearing bars on a pedestrian walkway where a 1-1/4-inch bar was comfortably within the deflection limit. The walkway was over-engineered by 40% and over-budget by about $1,800. Nobody noticed, nobody thanked me, and that money was gone.

When in doubt, go to the standard engineering references — NAAMM's Metal Bar Grating Manual is the one I keep on my shelf — and calculate from the actual load. Then look at the deflection table, not just the load rating. A panel that passes the load test but deflects too much under foot still feels unsafe, which in practice means complaints and eventually a redesign.

The “cheapest material wins” trap

In September 2022, I specified carbon steel for a washdown platform and saved about $600 versus fiberglass. The platform was near a chemical process line, and my working assumption was “steel is steel.” Wrong. Within eight months, the coating failed and the panels were corroding. Replacement cost: $4,200 plus a week of downtime. The $600 “saving” turned into a $4,800 total cost.

Since then, I run every material comparison through a simple total cost screen: price + freight + any fabrication + installation time, divided by how long the product will actually last. If material A costs $100 per panel and needs replacing in 3 years, that's about $33 per year. If material B costs $160 per panel and lasts 15 years, that's under $11 per year. The “expensive” panel wins on total cost. Grating is heavy, so freight is often the line item everyone forgets to compare — always ask for delivered price.

Your material starting points, if you want a quick map:

• Galvanized carbon steel: the workhorse for dry, interior jobs with no corrosive exposure.
• Aluminum: weighs about half as much as steel, so it helps when the supporting structure is light. Good for exterior platforms that need to handle weather.
• Stainless 304/316: your pick for food processing, pharma, chemical, and marine environments where washdown chemicals eat ordinary steel.
• Fiberglass grating: more expensive up front, but often the clear winner on total cost in corrosive or electrically sensitive areas.

When people type “McNichols steel” into a search bar, they're usually looking for the steel grating section. That's fine — just remember that steel is one of four material families in the catalog, and “which steel” depends on the environment and the span. If someone tells you “McNichols steel is the answer,” the useful follow-up question is “for what environment, carrying what load?”

One practical tip while you're comparing options: take a screenshot of the load table you're working from before you close the tab. (If you don't know how to take a screenshot on Windows, press Win+Shift+S, drag a box across the table, and it copies straight to your clipboard. That's the sort of basic thing nobody tells you — I wasted years sending crooked photos of my monitor instead.)

Situation C: Start From the Rule, Not From the Product

If an inspection date or a citation is why you're looking at grating, the regulation is your starting point. Not the product photos, not the load table, not what a guy on the previous site said used to work. The regulation.

In 2020, I specified grating with 1-1/2-inch clear openings for a washdown area so that debris could fall through to a drain below. Operationally it worked exactly as designed. But a walking-surface opening that big is a fall-through hazard for tools, parts, and fingers. The widely used rule of thumb in safety standards is that openings on walking surfaces stay under about 1 inch, and the inspector's tape measure did the math for me on-site. Rework cost: $7,500.

So when compliance is the trigger, work in this order:

1. Read the actual requirement — OSHA's walking-working surfaces standard (29 CFR 1910, Subpart D) is the big one for general industry, but check for any local or insurer additions.
2. Convert the requirement into two numbers: maximum opening size and minimum load rating.
3. Only then open the catalog. Filter by those two numbers, and you'll have a short list.

The gap between bars is the number that matters, not “the spacing pattern” or “it's the same as the old one.” In fact, the old one being non-compliant is usually how this situation started.

How to Tell Which Situation You're In

If you're not sure, this usually settles it:

• You're standing in front of the damaged section with a tape measure → Situation A. Match the physical product, then verify against the load table.
• You're at a desk with a set of drawings → Situation B. Start with load and environment, then run the total cost comparison on materials.
• You have an inspection date, a citation, or a safety note you can't argue with → Situation C. The code sets your spec. Start there.

Still stuck between two? Ask which force is actually driving the purchase: failure, design, or regulation. One of those three is always the reason. Answer that, and you know which list to follow.

The Checklist That Finally Stopped the Bleeding

I created our team's first spec checklist in Q1 2022, after the third costly rejection in eighteen months. Then September 2022 happened, and I learned that the checklist needed an explicit environment check before choosing a material. Since we expanded it, the team has caught 47 potential errors — wrong bar spacing, mismatched surface types, missing load approvals — and avoided more than $20,000 in rework over about 18 months. Every one of those was caught in the review, before fabrication. So yeah, I'm glad we documented the process.

The McNichols grating catalog isn't the problem. The problem is treating it like a menu and ordering whatever looks close enough. “Close enough” is an expensive spec. Measure the existing product, verify the design, read the rule, and run the total cost. Fifteen minutes of that, on every order, would have prevented most of my $38,000 in documented mistakes.

Seriously. That's it. Measure, verify, calculate — then order and be done with it.