Olympic Machined Plate | OM Series

Name: Olympic Machined Plate | OM Series
Brand: Ivanko
Rating: 4.11 (9 reviews)

Ivanko’s OM Series is “the iconic Ivanko plate” – a sand-cast iron Olympic plate that’s been machined on the back and outer circumference since the line’s introduction, with holes machine-drilled (not cast) so they sit perpendicular on the bar sleeve. The lineup runs from 1.25 lb up to 100 lb (plus a parallel 1.25-25 kg metric range), each plate individually priced rather than sold in pairs, and finished in a “1985 GREY” hammertone baked-on polyester coat that Ivanko sources from a German paint supplier.

The manufacturer holds a tight -0%/+2% weight tolerance and machines the center hole to 50.2-50.8mm, giving a snug (sub-1mm slop) fit on a standard 50mm Olympic sleeve – independently confirmed by a reviewer who weighed a 45 lb plate at 44.8 lb on a bathroom scale. Ivanko discloses up front that these are sand-cast, not machined from solid billet, so some surface variation between individual plates is expected rather than a defect. Independent coverage treats the OM as a “gold standard” reference point for machined plates – tighter hole tolerance and a truer 450mm diameter than some competitors’ China-made equivalents – though a side-by-side video comparison also found real cosmetic quibbles (rough burrs on the inner hole, milling marks visible under the paint) on a current OM-45, and country-of-origin claims vary by plate size in the review material gathered (a small 1.25 lb plate arrived with a “100% made in USA” card; a 45 lb plate examined on video was stamped made in China).

Buying guide

Best Weight Plates for Your Home Gym — July 2026 Bumper Plates or Iron Plates? How to Pick Your First Set — July 2026 Do You Need Calibrated or Competition Plates? — July 2026 How Much Do Weight Plates Cost Per Pound? — July 2026 What Weight Set Should a Beginner Buy? — July 2026 Will Dropping Weights Damage Your Floor? — July 2026

Finish	"1985 GREY" hammertone baked-on polyester paint (German-made); limited GREY/GREEN "final stock" variant also available in 2.5 lb and 5 lb
Material	Sand-cast iron (not machined from solid billet, per manufacturer disclosure)
Dimensions	1.25 lb: 5-1/4" dia x 1/2" thick -- 45 lb: 17-3/4" dia x 1-9/16" thick -- 100 lb: 17-3/4" dia x 1-1/4" thick (full table on the manufacturer page)
Center hole	50.2mm-50.8mm, machine-drilled (not cast) for perpendicular bar fit; fits standard 50mm Olympic sleeves with under 1mm of slop
Weight options	1.25, 2.5, 5, 10, 25, 35, 45, 100 lb, sold individually; also available in 1.25-25 kg metric sizes
Weight tolerance	-0% / +2% of stated weight; independently measured at 44.8 lb on a 45 lb plate (bathroom scale, YouTube: Lift life)
Country of origin	Not stated on the manufacturer page; review material conflicts -- a 1.25 lb plate's packaging claimed "100% made in USA," while a 45 lb plate examined independently was stamped made in China. Likely varies by plate size/weight; unresolved by available sources.

What is a Weight Plate?

What weight plates are

Weight plates load your barbell — but “plate” covers two very different tools. Bumper plates are rubber discs around a steel hub, all the same ~450mm diameter, built to be dropped from overhead without damaging your floor or bar; they’re the default for Olympic lifting and CrossFit. Iron/steel plates are denser and thinner per pound, cheaper, and quieter to load, but most aren’t made to be dropped — better for slow, controlled powerlifting-style work.

What actually matters

Bumper vs. iron. Buy bumpers if the bar might hit the floor; iron (or rubber-coated iron) for controlled lifts and compact loading.
Weight tolerance. How far a plate strays from its stated weight (±1% is tight, ±3% loose). It barely matters for general training but adds up if you chase a specific total — which is why serious lifters add small change / fractional plates.
Collar fit & bounce. The center hole should fit your bar’s sleeve snugly; rubber durometer (around 88 Shore A) controls how “dead” a dropped plate lands.
Coating & set composition. Virgin rubber holds up and smells less than recycled crumb rubber; plan a starting set (usually a pair each of 45/25/10/5 lb plus change plates) around the lifts you actually do.

Who it’s for

Every barbell gym needs plates. Most home lifters should start with a bumper set, then add iron, change, or specialty plates as a second purchase once they know what their training is missing.

How it compares

	Olympic Machined Plate \| OM Series	KG Change Plates (IWF)	Calibrated Weight Plates (LB)	Cast Iron Olympic Plates
GymRadar rating	4.11/5	4.11/5	4.11/5	4.13/5
Price	$9.75	$35.00	$299.00	$19.97
Finish	"1985 GREY" hammertone baked-on polyester paint (German-made); limited GREY/GREEN "final stock" variant also available in 2.5 lb and 5 lb	Matte finish, IWF color-coded		Silver hammertone finish with contrasting lettering
Material	Sand-cast iron (not machined from solid billet, per manufacturer disclosure)		CNC-machined steel, mirror chrome finish	Cast iron
Dimensions	1.25 lb: 5-1/4" dia x 1/2" thick -- 45 lb: 17-3/4" dia x 1-9/16" thick -- 100 lb: 17-3/4" dia x 1-1/4" thick (full table on the manufacturer page)
Center hole	50.2mm-50.8mm, machine-drilled (not cast) for perpendicular bar fit; fits standard 50mm Olympic sleeves with under 1mm of slop
Weight options	1.25, 2.5, 5, 10, 25, 35, 45, 100 lb, sold individually; also available in 1.25-25 kg metric sizes			2.5, 5, 10, 25 lb pairs; 35, 45 lb singles; also sold as a 245 lb complete set (one each of 2.5, 5, 10, 25, 35, 45 lb pairs)
Weight tolerance	-0% / +2% of stated weight; independently measured at 44.8 lb on a 45 lb plate (bathroom scale, YouTube: Lift life)	+/-10 grams	+/-20 grams (~0.04% on a 45 lb plate)	+/-2%; Garage Gym Products found 45 lb and 25 lb plates within about 1/4 lb of stated weight in practice
Country of origin	Not stated on the manufacturer page; review material conflicts -- a 1.25 lb plate's packaging claimed "100% made in USA," while a 45 lb plate examined independently was stamped made in China. Likely varies by plate size/weight; unresolved by available sources.

4.1/5 · 9 GymRadar reviews

Reviews by source

Expert	4.11/5	9 reviews
Youtube	4.0/5	2 reviews
Reddit	4.5/5	10 reviews

Ivanko’s OM Series has been “the iconic Ivanko plate” since the 1960s, and that reputation still shows in the independent signal: GymRadar owners average 4.11/5 across 9 reviews, and r/homegym treats a used OM find as a prize – commenters call the ~$2-3/lb new price steep but worth it for plates this consistent, and one independently confirms the manufacturer’s +/-2% weight tolerance on a bathroom scale. Value/Versatility stand out: the lineup spans 1.25 lb to 100 lb (plus a parallel kg range) with tight, machined center-hole tolerances (50.2-50.8mm) that fit a standard 50mm sleeve snugly. Build quality is the one dimension with a real split – an independent side-by-side against an elitefts plate found the current China-made OM-45 smooth and accurately milled overall, but noted rough burrs on the inner hole and milling marks visible under the paint, a step down from the reviewer’s memory of the older US-made O-series. A separate unboxing of a small 1.25 lb plate found a “100% made in USA” card in the box, so origin appears to vary by plate size/weight rather than being uniform across the line – worth flagging rather than smoothing over.

+Value: long-standing "gold standard" reputation in machined plates, with GymRadar owners averaging 4.11/5 across 9 reviews
+Functionality: center hole machined to 50.2-50.8mm, under 1mm of slop on a standard 50mm Olympic sleeve (tworepcave.com; manufacturer spec)
+Versatility: full weight range from 1.25 to 100 lb (plus a parallel 1.25-25 kg range), all sold as individual plates
+Durability: independently confirmed +/-2% weight tolerance in practice -- a 45 lb OM plate weighed 44.8 lb on a reviewer's bathroom scale (YouTube: Lift life)
+Value: strong resale/collector demand -- r/homegym treats used OM finds as standout deals, citing the $2-3/lb new price as a premium worth paying

−Build quality: rough burrs on the inner hole and visible milling marks under the paint on a current China-made OM-45, next to a cleaner-finished competitor plate (YouTube: Lift life)
−Build quality: origin is inconsistent across the line -- a small 1.25 lb plate shipped with a "100% made in USA" card, while a 45 lb plate examined on video is stamped made in China
−Value: sand-cast manufacturing means "no two plates are exactly alike" per the manufacturer's own disclosure -- surface consistency and porosity variation is expected, not a defect
−Functionality: a retailer notes the plates are dimensioned specifically for Ivanko bars and cautions they may not fit other Olympic bars as snugly, despite the standard-spec hole diameter

$9.75

Buy Now