Serrated Steel Bar Grating
Anti-slip notched-top grating for wet, oily, and sloped surfaces. Preferred for offshore platforms, food processing, and chemical plant walkways.
Calculate weight for serrated grating
Weight differs only marginally from plain — use the same calculator and subtract ~2%.
What is Serrated Grating?
Serrated (also called notched, anti-slip, or I-series in NAAMM terminology) grating is produced by cutting regular V-shaped or rectangular teeth into the top edge of each bearing bar after welding. The serration depth is typically 3–5 mm, with teeth pitched at approximately 10 mm intervals.
The notching creates sharp edges that bite into footwear soles, gloves, and machinery surfaces, dramatically reducing slip risk in wet or contaminated environments.
Serrated vs Plain: When to Choose
| Factor | Plain | Serrated |
|---|---|---|
| Surface friction | Standard | 30–60% higher |
| Weight | Baseline | ~1–3% lighter |
| Cost | Baseline | +10–20% (extra machining) |
| Cleaning | Easy | Slightly harder (notch accumulation) |
| Wet/oily environments | Acceptable | Recommended |
| Slopes > 5° | Not recommended | Required |
| Offshore / petrochemical | Not typically specified | Standard requirement |
Standard Designations
I-series suffix: 19-W-4 I (irregular serration), 19-W-4 R (regular). The 'I' suffix is the most common for industrial use.
Serrated grating is specified as 'anti-slip serrated top' under the same load classes A–E. No separate designation code.
Type G (锯齿型 — serrated). All standard bearing bar sizes available in serrated form.
Applications
- Offshore oil & gas platforms
- Chemical plant walkways
- Food processing facilities
- Ramps and inclined surfaces
- Car park drainage grates
- Marine decking
- Brewery and distillery floors
- Stair treads (serrated standard)
Sourcing from Anping
Anping factories produce serrated grating using cold-milling or press-cutting of bearing bar tops post-welding. MOQ is typically 5–10 tonnes for standard specs; custom serration patterns available from 20 t+. Lead time 20–30 days FOB Tianjin/Qingdao.
Frequently Asked Questions
What is serrated steel grating?
Serrated (notched) steel grating has teeth cut into the top edge of each bearing bar. The notching increases surface friction by 30–60%, making it the preferred choice for wet, oily, or sloped surfaces.
How much heavier is serrated grating than plain?
Serrated grating is actually slightly lighter than plain — the notching removes a small amount of material from the bearing bar tops. The difference is typically 1–3%.
What standards cover serrated steel grating?
NAAMM MBG 531 uses the suffix 'I' for irregular serration (e.g. 19-W-4 I). BS 4592 classifies serrated grating under the same load classes (A–E) as plain. GB/T 12755 covers both types.
When is serrated grating required?
Serrated grating is typically specified for offshore platforms, food processing plants, chemical plant walkways, ramps and inclines, and any surface exposed to water, oil, or chemical splash. OSHA does not mandate serrated, but many engineering specifications do for slopes over 5°.