---
title: "Mini Mesh Grating in Fiberglass: ADA Opening Rule & Specs"
description: "Mini mesh grating in molded fiberglass: the ADA 302.3 half-inch sphere rule, five catalog patterns with weight, open area, panel sizes and load tables."
url: https://www.strongrate.us/molded-fiberglass-grating/mini-mesh-ada/
markdown: https://www.strongrate.us/molded-fiberglass-grating/mini-mesh-ada.md
published: 2026-10-16
updated: 2026-10-17
---

[Home](https://www.strongrate.us/) › [Fiberglass grating](https://www.strongrate.us/fiberglass-grating/) › [Molded grating](https://www.strongrate.us/molded-fiberglass-grating/) › [Mini mesh (micro-mesh)](https://www.strongrate.us/molded-fiberglass-grating/mini-mesh-ada/)

# Mini Mesh Grating (Micro-Mesh) in Molded Fiberglass

_Updated Oct 17, 2026_

Use mini mesh grating on accessible routes and wherever small tools or parts must not drop through; ADA 302.3 requires that a 1/2" (13 mm) sphere cannot pass. Strongrate's catalog lists five mini-mesh patterns and marks three with a wheelchair icon, at 30–42% open area. Check the clear opening on a sample before you specify one for an accessible route.

**Strongrate catalog data: mini-mesh molded grating, five patterns**

| Mesh | Depth | Bar width (as printed) | Weight | Open area |
| --- | --- | --- | ---: | ---: |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.4 lb/ft² (16.8 kg/m²) [note 1] | 30% [note 1] |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.8 lb/ft² (18.5 kg/m²) [note 1] | 30% [note 1] |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 4.8 lb/ft² (23.5 kg/m²) [note 1] | 30% [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 9/16" (14 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 2.2 lb/ft² (10.5 kg/m²) [note 1] | 42% [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 7/8" (22 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.0 lb/ft² (14.5 kg/m²) [note 1] | 42% [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.7 lb/ft² (18.0 kg/m²) [note 1] | 42% [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 4.8 lb/ft² (23.5 kg/m²) [note 1] | 42% [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 2-3/8" (60 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 7.9 lb/ft² (38.5 kg/m²) [note 1] | 42% [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 7/8" (22 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.1 lb/ft² (15.0 kg/m²) [note 1] | 30% [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.9 lb/ft² (19.0 kg/m²) [note 1] | 30% [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 5.1 lb/ft² (25.0 kg/m²) [note 1] | 30% [note 1] |
| 1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm) [note 1] | 5/8" (15 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 1.5 lb/ft² (7.5 kg/m²) [note 1] | 55% [note 1] |
| 1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm) [note 1] | 2" (50 mm) [note 1] | 5/16" / 1/4" (8.0 / 6.0 mm) [note 1] | 5.8 lb/ft² (28.5 kg/m²) [note 1] | 55% [note 1] |
| 1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.2 lb/ft² (15.5 kg/m²) [note 1] | 60% [note 1] |
| 1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 4.0 lb/ft² (19.5 kg/m²) [note 1] | 60% [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. The catalog prints two bar widths per depth without saying which is the top and which the bottom of the bar._

Notes:

1. Values as printed in the factory catalog (2023).

## How does the ADA opening rule apply?

ADA 302.3 applies to the clear opening at the walking surface, and elongated openings must run perpendicular to the dominant direction of travel. Strongrate's catalog prints each pattern as a small mesh size over a larger bar pitch, not the clear opening, and every printed small size is larger than the 1/2" (12.7 mm) sphere. Measure the opening on a [sample](https://www.strongrate.us/samples/) before specifying it for an accessible route.

**Strongrate catalog mini-mesh patterns and the ADA 302.3 half-inch sphere**

| Pattern (catalog) | Wheelchair icon in the catalog | Printed small size |
| --- | --- | ---: |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | Yes [note 1] | 0.75" (19.05 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | Yes [note 1] | 0.79" (20 mm) [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | Yes [note 1] | 0.51" (13 mm) [note 1] |
| 1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm) [note 1] | No [note 1] | 1.00" (25.4 mm) [note 1] |
| 1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm) [note 1] | No [note 1] | 1.02" (26 mm) [note 1] |

_The ADA sphere is 1/2", 12.7 mm, across. A pattern meets the rule only if its measured clear opening at the walking surface is smaller._

Notes:

1. Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.

## What panel sizes are available?

- **3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm):** 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm)
- **3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm):** 4.09 ft × 13.28 ft (1247 × 4047 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm); 5 ft × 13.28 ft (1527 × 4047 mm); 3.3 ft × 6.58 ft (1007 × 2007 mm)
- **1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm):** 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 13.28 ft (1247 × 4047 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm)
- **1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm):** 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm); 5 ft × 13.12 ft (1524 × 4000 mm)
- **1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm):** 5 ft × 13.29 ft (1532 × 4050 mm); 3.95 ft × 13.16 ft (1205 × 4011 mm)

Panel sizes as printed in Strongrate’s catalog. Send your layout or drawings with the quote request. Sizes and weights of every product: [fiberglass grating sizes, weight and open area](https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area/).

## How much load can mini mesh grating carry?

It depends on the pattern and depth, so read the deflection at your clear span in the catalog tables below, for uniform and concentrated loads at ambient temperature. Halve the loads for impact. How to read the columns: [fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/).

**Uniform load deflection, Strongrate mini-mesh molded grating (catalog pages 67–68)**

| Clear span | Depth | Mesh (mm) | 31 psf (150 kg/m²) | 72 psf (350 kg/m²) | 102 psf (500 kg/m²) | 154 psf (750 kg/m²) | 205 psf (1,000 kg/m²) | 307 psf (1,500 kg/m²) | 512 psf (2,500 kg/m²) | Max load, psf (kg/m²) |
| --- | --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| 11-13/16" (300 mm) | 1" (25 mm) | 19x19/38x38 | < 0.01" (< 0.25 mm) | 0.01" (0.32 mm) | 0.02" (0.42 mm) | 0.02" (0.63 mm) | 0.03" (0.82 mm) | 0.05" (1.23 mm) | 0.08" (2.05 mm) | 11,578 (56,530) |
| 11-13/16" (300 mm) | 1-1/2" (38 mm) | 19x19/38x38 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.28 mm) | 0.02" (0.41 mm) | 0.02" (0.54 mm) | 0.03" (0.81 mm) | 0.05" (1.35 mm) | 17,600 (85,930) |
| 11-13/16" (300 mm) | 1-3/16" (30 mm) | 20x20/40x40 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.25 mm) | 0.02" (0.51 mm) | 6,971 (34,037) |
| 11-13/16" (300 mm) | 1-9/16" (40 mm) | 20x20/40x40 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.38 mm) | 7,247 (35,383) |
| 11-13/16" (300 mm) | 1-1/2" (38 mm) | 26x26/52x52 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.28 mm) | 0.01" (0.37 mm) | 0.02" (0.5 mm) | 8,504 (41,521) |
| 11-13/16" (300 mm) | 2" (50 mm) | 25x25/50x50 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.37 mm) | 12,252 (59,818) |
| 11-13/16" (300 mm) | 1-9/16" (40 mm) | 13x13/40x40 | — | — | — | 0.01" (0.31 mm) | 0.02" (0.42 mm) | 0.02" (0.61 mm) | 0.04" (0.97 mm) | 9,438 (46,081) |
| 17-3/4" (450 mm) | 1" (25 mm) | 19x19/38x38 | < 0.01" (< 0.25 mm) | 0.02" (0.47 mm) | 0.02" (0.63 mm) | 0.04" (0.94 mm) | 0.01" (0.23 mm) | 0.07" (1.85 mm) | 0.12" (3.08 mm) | 7,720 (37,690) |
| 17-3/4" (450 mm) | 1-1/2" (38 mm) | 19x19/38x38 | < 0.01" (< 0.25 mm) | 0.01" (0.31 mm) | 0.02" (0.41 mm) | 0.02" (0.62 mm) | 0.03" (0.81 mm) | 0.05" (1.22 mm) | 0.08" (2.03 mm) | 11,734 (57,290) |
| 17-3/4" (450 mm) | 1-3/16" (30 mm) | 20x20/40x40 | < 0.01" (< 0.25 mm) | 0.01" (0.31 mm) | 0.02" (0.5 mm) | 0.03" (0.75 mm) | 0.04" (0.98 mm) | 0.06" (1.47 mm) | 0.09" (2.19 mm) | 4,576 (22,343) |
| 17-3/4" (450 mm) | 1-9/16" (40 mm) | 20x20/40x40 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.37 mm) | 0.02" (0.56 mm) | 0.03" (0.73 mm) | 0.04" (1.11 mm) | 0.06" (1.64 mm) | 6,102 (29,790) |
| 17-3/4" (450 mm) | 1-1/2" (38 mm) | 26x26/52x52 | < 0.01" (< 0.25 mm) | 0.01" (0.28 mm) | 0.02" (0.39 mm) | 0.02" (0.58 mm) | 0.03" (0.76 mm) | 0.04" (1.14 mm) | 0.07" (1.7 mm) | 5,582 (27,255) |
| 17-3/4" (450 mm) | 2" (50 mm) | 25x25/50x50 | < 0.01" (< 0.25 mm) | < 0.01" (< 0.25 mm) | 0.01" (0.28 mm) | 0.02" (0.42 mm) | 0.02" (0.55 mm) | 0.03" (0.84 mm) | 0.05" (1.24 mm) | 7,639 (37,297) |
| 17-3/4" (450 mm) | 1-9/16" (40 mm) | 13x13/40x40 | — | — | 0.01" (0.36 mm) | 0.02" (0.54 mm) | 0.03" (0.71 mm) | 0.04" (1.07 mm) | 0.06" (1.6 mm) | 6,196 (30,249) |
| 23-5/8" (600 mm) | 1" (25 mm) | 19x19/38x38 | 0.02" (0.58 mm) | 0.05" (1.33 mm) | 0.08" (1.92 mm) | 0.11" (2.87 mm) | 0.15" (3.73 mm) | 0.22" (5.59 mm) | 0.37" (9.32 mm) | 3,351 (16,360) |
| 23-5/8" (600 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.01" (0.38 mm) | 0.03" (0.88 mm) | 0.05" (1.26 mm) | 0.07" (1.89 mm) | 0.10" (2.45 mm) | 0.14" (3.68 mm) | 0.24" (6.13 mm) | 5,094 (24,870) |
| 23-5/8" (600 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.03" (0.78 mm) | 0.04" (0.99 mm) | 0.06" (1.47 mm) | 0.09" (2.19 mm) | 0.11" (2.67 mm) | 0.16" (4.13 mm) | 0.28" (7.06 mm) | 2,742 (13,388) |
| 23-5/8" (600 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.02" (0.59 mm) | 0.03" (0.74 mm) | 0.04" (1.11 mm) | 0.06" (1.64 mm) | 0.08" (2 mm) | 0.12" (3.1 mm) | 0.21" (5.3 mm) | 3,656 (17,851) |
| 23-5/8" (600 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.02" (0.61 mm) | 0.03" (0.77 mm) | 0.04" (1.14 mm) | 0.07" (1.7 mm) | 0.08" (2.07 mm) | 0.24" (6.05 mm) | 0.31" (7.91 mm) | 3,345 (16,332) |
| 23-5/8" (600 mm) | 2" (50 mm) | 25x25/50x50 | 0.02" (0.45 mm) | 0.02" (0.56 mm) | 0.03" (0.84 mm) | 0.05" (1.24 mm) | 0.06" (1.52 mm) | 0.17" (4.42 mm) | 0.23" (5.78 mm) | 4,577 (22,348) |
| 23-5/8" (600 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.02" (0.57 mm) | 0.03" (0.72 mm) | 0.04" (1.07 mm) | 0.06" (1.6 mm) | 0.08" (1.94 mm) | 0.12" (3.01 mm) | 0.20" (5.14 mm) | 3,712 (18,125) |
| 29-1/2" (750 mm) | 1" (25 mm) | 19x19/38x38 | 0.03" (0.73 mm) | 0.07" (1.66 mm) | 0.09" (2.4 mm) | 0.14" (3.59 mm) | 0.18" (4.66 mm) | 0.28" (6.99 mm) | 0.46" (11.65 mm) | 2,235 (10,910) |
| 29-1/2" (750 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.02" (0.48 mm) | 0.04" (1.09 mm) | 0.06" (1.58 mm) | 0.09" (2.36 mm) | 0.12" (3.07 mm) | 0.18" (4.6 mm) | 0.30" (7.66 mm) | 3,396 (16,580) |
| 29-1/2" (750 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.04" (1.02 mm) | 0.10" (2.43 mm) | 0.14" (3.65 mm) | 0.22" (5.47 mm) | 0.29" (7.29 mm) | — | — | 1,753 (8,557) |
| 29-1/2" (750 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.03" (0.77 mm) | 0.07" (1.82 mm) | 0.11" (2.73 mm) | 0.16" (4.1 mm) | 0.22" (5.47 mm) | 0.32" (8.16 mm) | — | 2,337 (11,409) |
| 29-1/2" (750 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.03" (0.8 mm) | 0.07" (1.89 mm) | 0.11" (2.83 mm) | 0.17" (4.25 mm) | 0.33" (8.39 mm) | — | — | 2,138 (10,438) |
| 29-1/2" (750 mm) | 2" (50 mm) | 25x25/50x50 | 0.02" (0.58 mm) | 0.05" (1.38 mm) | 0.08" (2.07 mm) | 0.12" (3.1 mm) | 0.24" (6.13 mm) | 0.34" (8.71 mm) | — | 2,926 (14,284) |
| 29-1/2" (750 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.03" (0.75 mm) | 0.07" (1.77 mm) | 0.10" (2.65 mm) | 0.16" (3.98 mm) | 0.21" (5.31 mm) | 0.28" (7.17 mm) | — | 2,373 (11,584) |
| 35-7/16" (900 mm) | 1" (25 mm) | 19x19/38x38 | 0.11" (2.89 mm) | 0.28" (7.01 mm) | 0.36" (9.23 mm) | — | — | — | — | 977 (4,770) |
| 35-7/16" (900 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.08" (2.05 mm) | 0.17" (4.38 mm) | 0.27" (6.8 mm) | 0.40" (10.21 mm) | — | — | — | 1,216 (5,939) |
| 35-7/16" (900 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.06" (1.54 mm) | 0.13" (3.29 mm) | 0.20" (5.1 mm) | 0.30" (7.65 mm) | 0.40" (10.08 mm) | — | — | 1,622 (7,919) |
| 35-7/16" (900 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.06" (1.59 mm) | 0.13" (3.4 mm) | 0.21" (5.28 mm) | 0.31" (7.93 mm) | 0.41" (10.52 mm) | — | — | 1,484 (7,245) |
| 35-7/16" (900 mm) | 2" (50 mm) | 25x25/50x50 | 0.05" (1.16 mm) | 0.10" (2.49 mm) | 0.15" (3.86 mm) | 0.23" (5.79 mm) | 0.30" (7.69 mm) | 0.37" (9.46 mm) | — | 2,031 (9,914) |
| 35-7/16" (900 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.06" (1.49 mm) | 0.13" (3.19 mm) | 0.19" (4.95 mm) | 0.29" (7.43 mm) | 0.34" (8.54 mm) | — | — | 1,647 (8,040) |
| 47-1/4" (1200 mm) | 1" (25 mm) | 19x19/38x38 | 0.15" (3.85 mm) | 0.37" (9.35 mm) | 0.48" (12.31 mm) | — | — | — | — | 737 (3,600) |
| 47-1/4" (1200 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.10" (2.53 mm) | 0.24" (6.15 mm) | 0.32" (8.1 mm) | 0.48" (12.09 mm) | — | — | — | 1,120 (5,470) |
| 47-1/4" (1200 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.22" (5.66 mm) | 0.31" (7.89 mm) | 0.44" (11.27 mm) | — | — | — | — | 717 (3,499) |
| 47-1/4" (1200 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.17" (4.24 mm) | 0.23" (5.92 mm) | 0.33" (8.45 mm) | 0.49" (12.37 mm) | — | — | — | 955 (4,665) |
| 47-1/4" (1200 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.17" (4.39 mm) | 0.24" (6.13 mm) | 0.34" (8.75 mm) | 0.47" (11.82 mm) | — | — | — | 874 (4,268) |
| 47-1/4" (1200 mm) | 2" (50 mm) | 25x25/50x50 | 0.13" (3.21 mm) | 0.18" (4.48 mm) | 0.25" (6.4 mm) | 0.34" (8.64 mm) | 0.45" (11.39 mm) | — | — | 1,196 (5,841) |
| 47-1/4" (1200 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.06" (1.61 mm) | 0.16" (4.06 mm) | 0.22" (5.68 mm) | 0.32" (8.24 mm) | 0.36" (9.23 mm) | 0.49" (12.45 mm) | — | — |

_Cells are deflection under static load at ambient temperature, as printed in Strongrate’s 2023 catalog (mm), with inches converted; “—” means no value is printed. Halve the loads for impact or dynamic conditions. Confirm the values for your span in the submittal before final design._

Notes:

- Deflections as printed in the factory catalog (2023), static loads at ambient temperature.
- Catalog tables.

**Concentrated point load deflection, Strongrate mini-mesh molded grating (catalog pages 68–69)**

| Clear span | Depth | Mesh (mm) | 331 lb (150 kg) | 772 lb (350 kg) | 1,102 lb (500 kg) | 1,653 lb (750 kg) | 2,205 lb (1,000 kg) | 3,307 lb (1,500 kg) | 5,512 lb (2,500 kg) | 6,614 lb (3,000 kg) |
| --- | --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| 11-13/16" (300 mm) | 1" (25 mm) | 19x19/38x38 | — | 0.01" (0.29 mm) | 0.02" (0.39 mm) | 0.03" (0.68 mm) | 0.04" (0.9 mm) | 0.05" (1.17 mm) | 0.07" (1.85 mm) | 0.09" (2.29 mm) |
| 11-13/16" (300 mm) | 1-1/2" (38 mm) | 19x19/38x38 | — | — | 0.01" (0.31 mm) | 0.02" (0.54 mm) | 0.03" (0.72 mm) | 0.04" (0.93 mm) | 0.06" (1.48 mm) | 0.07" (1.82 mm) |
| 11-13/16" (300 mm) | 1-3/16" (30 mm) | 20x20/40x40 | — | 0.01" (0.33 mm) | 0.02" (0.45 mm) | 0.03" (0.78 mm) | 0.04" (1.03 mm) | 0.05" (1.34 mm) | 0.08" (2.12 mm) | 0.10" (2.62 mm) |
| 11-13/16" (300 mm) | 1-9/16" (40 mm) | 20x20/40x40 | — | 0.01" (0.25 mm) | 0.01" (0.33 mm) | 0.02" (0.58 mm) | 0.03" (0.77 mm) | 0.04" (1 mm) | 0.06" (1.59 mm) | 0.08" (1.97 mm) |
| 11-13/16" (300 mm) | 1-1/2" (38 mm) | 26x26/52x52 | — | 0.02" (0.48 mm) | 0.02" (0.63 mm) | 0.04" (0.99 mm) | 0.06" (1.41 mm) | 0.08" (1.91 mm) | 0.12" (3.13 mm) | — |
| 11-13/16" (300 mm) | 2" (50 mm) | 25x25/50x50 | — | 0.01" (0.34 mm) | 0.02" (0.45 mm) | 0.03" (0.7 mm) | 0.04" (1 mm) | 0.05" (1.36 mm) | 0.09" (2.22 mm) | 0.11" (2.67 mm) |
| 11-13/16" (300 mm) | 1-9/16" (40 mm) | 13x13/40x40 | — | — | 0.01" (0.32 mm) | 0.02" (0.57 mm) | 0.03" (0.75 mm) | 0.04" (0.97 mm) | 0.06" (1.54 mm) | 0.08" (1.91 mm) |
| 17-3/4" (450 mm) | 1" (25 mm) | 19x19/38x38 | 0.02" (0.39 mm) | 0.02" (0.47 mm) | 0.03" (0.64 mm) | 0.04" (1.11 mm) | 0.06" (1.47 mm) | 0.08" (1.91 mm) | 0.12" (3.02 mm) | 0.15" (3.74 mm) |
| 17-3/4" (450 mm) | 1-1/2" (38 mm) | 19x19/38x38 | — | 0.01" (0.38 mm) | 0.02" (0.52 mm) | 0.04" (0.9 mm) | 0.05" (1.2 mm) | 0.06" (1.55 mm) | 0.10" (2.46 mm) | 0.12" (3.04 mm) |
| 17-3/4" (450 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.01" (0.38 mm) | 0.02" (0.5 mm) | 0.03" (0.67 mm) | 0.05" (1.17 mm) | 0.06" (1.55 mm) | 0.08" (2.01 mm) | 0.13" (3.18 mm) | 0.15" (3.93 mm) |
| 17-3/4" (450 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.01" (0.25 mm) | 0.01" (0.37 mm) | 0.02" (0.5 mm) | 0.03" (0.87 mm) | 0.05" (1.16 mm) | 0.06" (1.51 mm) | 0.09" (2.39 mm) | 0.12" (2.95 mm) |
| 17-3/4" (450 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.02" (0.39 mm) | 0.03" (0.81 mm) | 0.04" (1.05 mm) | 0.06" (1.65 mm) | 0.09" (2.35 mm) | 0.13" (3.18 mm) | 0.21" (5.22 mm) | — |
| 17-3/4" (450 mm) | 2" (50 mm) | 25x25/50x50 | 0.01" (0.25 mm) | 0.02" (0.51 mm) | 0.03" (0.67 mm) | 0.04" (1.06 mm) | 0.06" (1.5 mm) | 0.08" (2.03 mm) | 0.13" (3.34 mm) | 0.16" (4.01 mm) |
| 17-3/4" (450 mm) | 1-9/16" (40 mm) | 13x13/40x40 | — | 0.01" (0.36 mm) | 0.02" (0.49 mm) | 0.03" (0.85 mm) | 0.04" (1.13 mm) | 0.06" (1.46 mm) | 0.09" (2.32 mm) | 0.11" (2.86 mm) |
| 23-5/8" (600 mm) | 1" (25 mm) | 19x19/38x38 | 0.02" (0.53 mm) | 0.04" (1.11 mm) | 0.06" (1.44 mm) | 0.09" (2.27 mm) | 0.13" (3.23 mm) | 0.17" (4.37 mm) | 0.28" (7.17 mm) | — |
| 23-5/8" (600 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.02" (0.43 mm) | 0.04" (0.9 mm) | 0.05" (1.17 mm) | 0.07" (1.85 mm) | 0.10" (2.63 mm) | 0.14" (3.56 mm) | 0.23" (5.93 mm) | — |
| 23-5/8" (600 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.02" (0.56 mm) | 0.05" (1.17 mm) | 0.06" (1.52 mm) | 0.09" (2.39 mm) | 0.13" (3.4 mm) | 0.18" (4.6 mm) | 0.30" (7.55 mm) | — |
| 23-5/8" (600 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.02" (0.42 mm) | 0.03" (0.87 mm) | 0.04" (1.14 mm) | 0.07" (1.79 mm) | 0.10" (2.55 mm) | 0.14" (3.45 mm) | 0.22" (5.66 mm) | — |
| 23-5/8" (600 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.02" (0.57 mm) | 0.05" (1.19 mm) | 0.06" (1.55 mm) | 0.10" (2.45 mm) | 0.14" (3.48 mm) | 0.19" (4.71 mm) | 0.30" (7.73 mm) | — |
| 23-5/8" (600 mm) | 2" (50 mm) | 25x25/50x50 | 0.01" (0.36 mm) | 0.03" (0.76 mm) | 0.04" (0.99 mm) | 0.06" (1.57 mm) | 0.09" (2.22 mm) | 0.12" (3.01 mm) | 0.19" (4.94 mm) | 0.23" (5.93 mm) |
| 23-5/8" (600 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.02" (0.41 mm) | 0.03" (0.85 mm) | 0.04" (1.11 mm) | 0.07" (1.74 mm) | 0.10" (2.47 mm) | 0.13" (3.35 mm) | 0.22" (5.5 mm) | — |
| 29-1/2" (750 mm) | 1" (25 mm) | 19x19/38x38 | 0.04" (0.9 mm) | 0.08" (2.1 mm) | 0.11" (2.7 mm) | 0.17" (4.28 mm) | 0.25" (6.28 mm) | 0.33" (8.47 mm) | — | — |
| 29-1/2" (750 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.03" (0.73 mm) | 0.07" (1.71 mm) | 0.09" (2.2 mm) | 0.14" (3.48 mm) | 0.20" (5.11 mm) | 0.27" (6.93 mm) | — | — |
| 29-1/2" (750 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.04" (0.95 mm) | 0.09" (2.21 mm) | 0.11" (2.84 mm) | 0.18" (4.5 mm) | 0.26" (6.61 mm) | 0.35" (8.92 mm) | — | — |
| 29-1/2" (750 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.03" (0.71 mm) | 0.07" (1.66 mm) | 0.08" (2.13 mm) | 0.13" (3.38 mm) | 0.20" (4.96 mm) | 0.26" (6.69 mm) | 0.40" (10.23 mm) | — |
| 29-1/2" (750 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.04" (0.97 mm) | 0.09" (2.26 mm) | 0.11" (2.91 mm) | 0.18" (4.61 mm) | 0.27" (6.77 mm) | 0.36" (9.15 mm) | — | — |
| 29-1/2" (750 mm) | 2" (50 mm) | 25x25/50x50 | 0.02" (0.62 mm) | 0.06" (1.45 mm) | 0.07" (1.86 mm) | 0.12" (2.95 mm) | 0.17" (4.33 mm) | 0.23" (5.85 mm) | 0.36" (9.12 mm) | — |
| 29-1/2" (750 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.03" (0.69 mm) | 0.06" (1.61 mm) | 0.08" (2.07 mm) | 0.13" (3.28 mm) | 0.19" (4.81 mm) | 0.26" (6.49 mm) | — | — |
| 35-7/16" (900 mm) | 1" (25 mm) | 19x19/38x38 | 0.05" (1.27 mm) | 0.12" (3.09 mm) | 0.16" (3.95 mm) | 0.25" (6.29 mm) | 0.37" (9.33 mm) | — | — | — |
| 35-7/16" (900 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.04" (1.03 mm) | 0.10" (2.51 mm) | 0.13" (3.22 mm) | 0.20" (5.12 mm) | 0.30" (7.59 mm) | 0.41" (10.3 mm) | — | — |
| 35-7/16" (900 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.05" (1.34 mm) | 0.13" (3.25 mm) | 0.16" (4.16 mm) | 0.26" (6.62 mm) | 0.39" (9.82 mm) | — | — | — |
| 35-7/16" (900 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.04" (1 mm) | 0.10" (2.44 mm) | 0.12" (3.12 mm) | 0.20" (4.97 mm) | 0.29" (7.36 mm) | 0.39" (9.94 mm) | — | — |
| 35-7/16" (900 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.05" (1.37 mm) | 0.13" (3.33 mm) | 0.17" (4.26 mm) | 0.27" (6.78 mm) | 0.40" (10.05 mm) | — | — | — |
| 35-7/16" (900 mm) | 2" (50 mm) | 25x25/50x50 | 0.03" (0.88 mm) | 0.08" (2.13 mm) | 0.11" (2.72 mm) | 0.17" (4.34 mm) | 0.25" (6.43 mm) | 0.37" (9.34 mm) | — | — |
| 35-7/16" (900 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.04" (0.97 mm) | 0.09" (2.36 mm) | 0.12" (3.03 mm) | 0.19" (4.82 mm) | 0.28" (7.15 mm) | 0.38" (9.65 mm) | — | — |
| 47-1/4" (1200 mm) | 1" (25 mm) | 19x19/38x38 | 0.08" (2.11 mm) | 0.21" (5.3 mm) | 0.29" (7.41 mm) | 0.42" (10.76 mm) | 0.53" (13.45 mm) | — | — | — |
| 47-1/4" (1200 mm) | 1-1/2" (38 mm) | 19x19/38x38 | 0.07" (1.72 mm) | 0.17" (4.31 mm) | 0.24" (6.03 mm) | 0.34" (8.76 mm) | 0.51" (12.87 mm) | — | — | — |
| 47-1/4" (1200 mm) | 1-3/16" (30 mm) | 20x20/40x40 | 0.09" (2.22 mm) | 0.22" (5.58 mm) | 0.31" (7.8 mm) | 0.45" (11.32 mm) | — | — | — | — |
| 47-1/4" (1200 mm) | 1-9/16" (40 mm) | 20x20/40x40 | 0.07" (1.66 mm) | 0.16" (4.18 mm) | 0.23" (5.85 mm) | 0.33" (8.49 mm) | 0.45" (11.32 mm) | — | — | — |
| 47-1/4" (1200 mm) | 1-1/2" (38 mm) | 26x26/52x52 | 0.09" (2.27 mm) | 0.22" (5.71 mm) | 0.31" (7.99 mm) | 0.45" (11.55 mm) | 0.61" (15.47 mm) | — | — | — |
| 47-1/4" (1200 mm) | 2" (50 mm) | 25x25/50x50 | 0.06" (1.45 mm) | 0.14" (3.65 mm) | 0.20" (5.11 mm) | 0.29" (7.41 mm) | 0.39" (9.89 mm) | 0.56" (14.34 mm) | — | — |
| 47-1/4" (1200 mm) | 1-9/16" (40 mm) | 13x13/40x40 | 0.06" (1.61 mm) | 0.16" (4.06 mm) | 0.22" (5.68 mm) | 0.32" (8.24 mm) | 0.36" (9.23 mm) | 0.49" (12.45 mm) | — | — |

_Cells are deflection under static load at ambient temperature, as printed in Strongrate’s 2023 catalog (mm), with inches converted; “—” means no value is printed. Halve the loads for impact or dynamic conditions. Confirm the values for your span in the submittal before final design._

Notes:

- Deflections as printed in the factory catalog (2023), static loads at ambient temperature.
- Catalog tables.

## Which resins and surfaces can you order?

Strongrate’s catalog lists fire-retardant vinyl ester, isophthalic, food-grade isophthalic and orthophthalic resin for molded grating, and states a slip coefficient of 0.91 (ASTM D2047) for its normal grit surface. Mini and micro mesh are also cut into [fiberglass stair treads](https://www.strongrate.us/fiberglass-stair-treads/), and used on [docks and marinas](https://www.strongrate.us/applications/dock-and-marina-grating/). Resins are compared on [molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/).

## How is mini mesh grating quoted and shipped?

Made in Nantong, China, and shipped from China. Full containers and project quantities are quoted factory-direct; orders under about 500 sq ft, or needed in under 3 weeks, are referred to US stocking importers. Prices are quoted per project: see [fiberglass grating price per square foot](https://www.strongrate.us/pricing/fiberglass-grating-price/), add [hold-down clips](https://www.strongrate.us/accessories/fiberglass-grating-clips/), and [request a quote](https://www.strongrate.us/request-quote/).

## Frequently asked questions

### What is the difference between mini mesh and micro-mesh grating?

Both are trade names for small-opening molded grating. Strongrate’s catalog uses both names for its mini-mesh patterns; the US market usually says mini mesh. Opening sizes differ by maker, so compare the clear opening, not the name.

### Does passing a larger test ball prove ADA compliance?

No. One maker cites a 0.59" (15 mm) ball, larger than the 1/2" (13 mm) sphere in ADA 302.3, so an opening that stops it can still be too large. Check the clear opening against the 1/2" rule itself.

### Is a small opening enough for grating on an accessible route?

No. The ADA Standards also require floor surfaces on accessible routes to be stable, firm and slip resistant, so specify a gritted or concave top as well as the opening.

## Related pages
- [Molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/): Molded fiberglass (FRP) grating from Strongrate’s Nantong factory by depth and mesh: square, rectangular and mini meshes, the four DNV-listed models with their ASTM E84 results, panel sizes, resins, surfaces and how to get factory pricing.
- [1" molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/1-inch-square-mesh/): Specifications, ASTM E84 results, panel sizes and catalog load tables for Strongrate 1-inch-deep molded fiberglass grating with a 1-1/2-inch square mesh (DNV-listed model 38×38×25 mm), and how to order it.
- [Rectangular mesh fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/1x4-rectangular-mesh/): Strongrate’s 1-inch × 4-inch and 1-inch × 6-inch rectangular-mesh molded grating: catalog weight, open area, span direction, panel sizes and deflection tables, the DNV-listed 1 × 6 vinyl ester model’s ASTM E84 results, and how to order.
- [Fiberglass dock and marina grating](https://www.strongrate.us/applications/dock-and-marina-grating/): Fiberglass grating for docks, piers and marinas: resin and UV choices for salt water, barefoot-friendly surfaces, open area, panel sizes and weights, load tables, certificates and price benchmarks.
- [Fiberglass grating samples](https://www.strongrate.us/samples/): Request a fiberglass grating sample from the factory in Nantong, China, to check surface, color and fit before a container order or for a project submittal.

**Request a quote:** https://www.strongrate.us/request-quote/ · Order a sample: https://www.strongrate.us/samples/ — Send the clear opening you need, span, load, panel size, quantity and ZIP code for mini mesh grating. Quotes within 1 business day (US Central time).

## Sources
- [U.S. Access Board, Guide to the ADA Standards, Chapter 3: Floor and Ground Surfaces](https://www.access-board.gov/ada/guides/chapter-3-floor-and-ground-surfaces/) (accessed Oct 15, 2026)
- Strongrate product catalog “Your Best FRP Solution” (image PDF, Sep 2023), supplied by the site owner (accessed Oct 17, 2026)
- [Strongrate website page title (search index): strongrate.com/product-micro-mesh-frp-grating.html](https://www.strongrate.com/product-micro-mesh-frp-grating.html) (accessed Oct 15, 2026)
- [American Grating, ADA Compliant Fiberglass Grating page](https://www.americangrating.com/ada-compliant-frp-grating.aspx) (accessed Oct 15, 2026)

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Fiberglass (FRP) grating made by NANTONG STRONGRATE CO.,LTD in Nantong, China. Products ship from China. Made in Nantong, China · Ships from China · HTS 3925.90.