McNichols Grating and Wire Mesh: A Quality Inspector's Ordering Checklist (February 2025)

If you are about to order grating, wire mesh, or perforated metal from McNichols, this checklist is for you. I'm a quality compliance manager at an industrial materials company. I review roughly 200+ unique items a year before they go out, and honestly, the most common reason for rejections is not a manufacturing defect—it's a specs mismatch. In 2024, I rejected about 9% of first deliveries for that reason. Most could have been caught before the order went through.

To be fair, not every order needs all six steps. If you're reordering the exact same item, this will go faster. But if this is a new product or a new supplier, the 20 minutes you spend on specs is cheap compared with a rejected delivery.

Six steps: define the application, pick the material, check load and code requirements, confirm dimensions, inspect on delivery, and document issues. The last one includes a quick VLC trick.

Step 1: Know What McNichols Grating Includes

McNichols grating sounds like one product. It's not. It covers welded bar grating, press-locked grating, swaged grating, and fiberglass grating. Plain language: you need to know whether you're walking on it, driving on it, or just covering a trench. The bearing bar spacing and thickness change the load capacity completely. From the outside, grating just looks like a steel grid. The reality is a 1/4-inch bar with 1-3/16 inch spacing handles different loads than a 3/16-inch bar at 1-inch spacing.

Welded bar grating is the standard for industrial platforms because the bearing bars are welded to the cross bars. Press-locked grating is used where appearance matters. Swaged grating has a smoother top surface and is easier to clean. Fiberglass grating is the usual answer for chemical or electrical environments. If you don't know which one you need, call and ask. A two-minute phone call is cheaper than a wrong order.

As of February 2025, the McNichols website lets you filter by product type, material, and opening size. Use those filters instead of guessing.

Step 2: McNichols Wire Mesh Is Not Expanded Metal

McNichols wire mesh, to be specific, is woven or welded wire. It comes in rolls or sheets and is sold by wire diameter and mesh count. Mesh is not a vague word. A 4x4 mesh means roughly four openings per inch in each direction. If you order the wrong mesh count, the screen will either be too open or too dense.

Expanded metal looks similar at first glance but is cut and stretched from a single sheet. It has diamond-shaped openings and no joints. People assume wire mesh and expanded metal are interchangeable. They're not. Expanded metal is stiffer and won't unravel if a wire breaks, while wire mesh gives more open area for airflow.

Step 3: Choose the Material for the Environment

Steel, galvanized steel, stainless steel 304, stainless 316, aluminum, and fiberglass each make sense in specific conditions. Galvanized is the default for dry indoor areas. Stainless 316 is better for coastal or chemical environments. If you need no ferrous metal, fiberglass grating is the standard answer.

One tool note: a glass cutter won't cut fiberglass grating. If that sounds obvious, it wasn't on one of our jobs. Standard fiberglass grating needs a carbide-tipped blade or an abrasive cut-off saw, not a scoring tool meant for glass. Also wear a mask; the dust is nasty.

Step 4: Check Load, Code, and Fall Protection Requirements

If the grating is for a walking surface, load capacity is not a suggestion. The McNichols catalog includes load tables, but verify the current table for the exact product you're ordering. I'd also check OSHA 29 CFR 1910.23 for fixed stairs and walking-working surfaces. I'm not a code official, so confirm with your local AHJ before ordering.

This is the step that feels like overkill until it isn't. A $22,000 redo I reviewed involved a grating spec that looked fine on paper but didn't match the actual support spacing. The fix wasn't better fabrication; it was better dimensioning.

Step 5: Confirm Cut-to-Size Dimensions and Tolerance

McNichols offers custom fabrication. If you need 24-inch by 48-inch panels, say it clearly. Don't assume shearing or flame-cutting is included automatically.

Write down the overall width and length, open area, and any hole patterns. If you're ordering perforated metal for sound proofing panels, the critical spec is the open area percentage. A panel can look perfect and still fail acoustically if the holes are too small or too spaced out.

Also ask for cut tolerance. A consistent tolerance like plus/minus 1/8 inch may be fine for a fence panel but not for a machine guard. If you don't ask, the vendor uses their default.

Small runs: don't apologize for a small quote. If you need two custom panels, ask for two. A supplier who makes you feel stupid for ordering low volume isn't a supplier worth keeping.

Step 6: Inspect the Delivery Before You Sign

Here's the checklist I run on receiving:

• Verify material grade marking. Stainless and steel grades are often stamped on the tag.
• Measure actual dimensions, not just the edge that faces you.
• Check opening size and bar thickness.
• Look for coating damage, rust, or sharp burrs.
• Count the quantity. One panel short on a 50-panel order is common.

If something is off, don't accept industry standard without seeing a number. Normal tolerance should be stated. If the vendor can't state it in writing, that's a red flag.

How to Trim Video in VLC for a Supplier Complaint

When a defect shows up, send the supplier a short clip. You don't need a professional editor; you need proof.

Open the video in VLC, go to View, then Advanced Controls. The record button appears in the playback toolbar. Start the video at the point where the defect is visible, click Record, let it run for a few seconds, then click Stop. VLC saves the clip to your Videos folder. That's what I use for a quick visual complaint.

This is not a subtle tool, but it gets the job done. If you need to mark dimensions on the video, you'll need something else. Honestly, for most quality disputes, a 10-second recording plus a photo of the tape measure is enough.

Bottom Line: Specs Beat Order Size

People assume online suppliers only care about order size. As of February 2025, the more common issue is orders with vague specs. Small, clear orders get better service than large, confusing ones. McNichols carries a big product range, but their team can't read your mind. If you know what you're buying, whether it's McNichols grating, McNichols wire mesh, or a custom perforated panel, the process is fairly straightforward.

This checklist worked for my domestic US orders. If you're dealing with international shipping, unusual metric sizes, or a project with strict acoustical requirements, the details will change. But the habit of confirming specs before ordering never goes out of style.