Olympic Cast Iron Weight Plates 1.25 kg to 25 kg Pairs, Sets to 150 kg

Showing Sets / 45KG Set · 45 kg the set

Free delivery to every address in Great Britain.

Olympic Plates

Machined cast iron with a true Olympic two-inch bore. Cast iron remains the most cost-effective way to load a barbell heavily, because it is denser than rubber or urethane and therefore takes up less sleeve length for the same weight.

KEY FEATURES

Olympic 2-inch (50mm) bore fits all standard Olympic barbells
Weight increments from 1.25kg through to 25kg
Solid cast iron construction with a protective finish
Thin profile allows more total weight per sleeve
Accurate machined bore for a clean, rattle-free fit
Ideal for powerlifting-style training and rack work

PRODUCT OVERVIEW

Plate thickness is the specification most people overlook and later regret. An Olympic 2" Barbell sleeve has a finite loadable length, and rubber-coated or bumper plates are considerably thicker per kilogram than bare cast iron. If you intend to squat or deadlift above roughly 150kg, cast iron plates are not just cheaper, they are the only way to physically fit the weight on the bar.

The bore is the other quality marker. A machined 50mm bore sits snugly on the sleeve without excessive play, which stops plates clattering on every rep and reduces wear on both plate and bar. Loose, poorly finished bores are the usual cause of the rattling you hear on cheap plates during a bench press.

TRAINING APPLICATION

Cast iron is the natural choice for slow, controlled strength work performed inside a rack: back squats, bench press, overhead press, bent-over rows and rack pulls. What cast iron should not do is get dropped from height. It does not absorb impact, so it will damage flooring, the bar and itself. For Olympic lifting or anything involving dropping the bar, bumper plates are the correct tool.

HOW TO CHOOSE?

Choose cast iron if you train inside a rack, want maximum weight per pound spent, and expect to load heavily. Choose bumper plates if you deadlift from the floor without a rack, perform cleans or snatches, or train in a room where dropped weight is a concern. Many home gyms run a hybrid: bumpers for the first 20kg pair so the bar sits at the correct height from the floor, then cast iron for everything above.

FAQs

Will these fit my barbell?

They fit any standard Olympic bar with a 50mm sleeve. They will not fit standard one-inch spinlock bars used in convertible dumbbell sets.

Can I drop cast iron plates?

No. Cast iron does not absorb impact and will damage your floor, your bar and the plates. Use bumper plates if dropping is part of your training.

Why are cast iron plates thinner than rubber ones?

Iron is far denser than rubber, so it needs less volume for the same mass. That means more weight fits on the loadable sleeve length.

Do I need collars?

Yes. Always secure loaded plates with spring collars or quick-release collars, particularly on bench press and overhead work.

Specifications

Material: High-quality cast iron for maximum durability and performance.
Size: Available in various sizes with increasing thickness based on weight for optimal balance.
Hole Size: Precision-machined holes for a snug fit on Olympic bars, ensuring smooth loading and unloading.
Finish: Black powder-coated finish with silver lettering for added durability and a sleek look.

Plate Dimensions:

1.25 kg: Diameter – 16 cm, Thickness – 12.4 mm, Sleeve – 50 mm
2.5 kg: Diameter – 23 cm, Thickness – 16.2 mm, Sleeve – 50 mm
5 kg: Diameter – 23 cm, Thickness – 21.7 mm, Sleeve – 50 mm
10 kg: Diameter – 27 cm, Thickness – 34.4 mm, Sleeve – 50 mm
15 kg: Diameter – 35 cm, Thickness – 34.2 mm, Sleeve – 50 mm
20 kg: Diameter – 45 cm, Thickness – 33.6 mm, Sleeve – 50 mm
25 kg: Diameter – 45 cm, Thickness – 36.6 mm, Sleeve – 50 mm

Key Features:

Durable Stainless Steel Inserts: Each plate comes with a high-quality stainless steel insert, ensuring a secure and snug fit on Olympic bar sleeves (50mm).
Perfect for Olympic Bars: Designed specifically to fit standard 50mm diameter bar sleeves, making them ideal for heavy lifting and ensuring a firm, stable grip during your workout.

Weights & dimensions

Olympic Cast Iron Weight Plates 1.25 kg to 25 kg Pairs, Sets to 150 kg — every weight
Variant	Weight (each)	Pair total	Price	Availability	SKU	GTIN	Description
Cast Iron Olympic Weight Plates Pair 2 x 1.25kg, 2 inch Bore	1.25 KG	2.5 kg	£8.49	In stock	CI-PLT-1.25KG-NB-P	5299466727933	Description This pair of 1.25kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 2.5kg, 2 inch Bore	2.5 KG	5 kg	£12.49	In stock	CI-PLT-2.5KG-NB-P	5299467577254	Description This pair of 2.5kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 5kg, 2 inch Bore	5.0 KG	10 kg	£20.49	In stock	CI-PLT-5KG-NB-P	5299467974442	Description This pair of 5kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 10kg, 2 inch Bore	10.0 KG	20 kg	£39.99	In stock	CI-PLT-10KG-NB-P	5299468598128	Description This pair of 10kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 15kg, 2 inch Bore	15.0 KG	30 kg	£63.99	In stock	CI-PLT-15KG-NB-P	5299468639340	Description This pair of 15kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 20kg, 2 inch Bore	20.0 KG	40 kg	£79.99	In stock	CI-PLT-20KG-NB-P	5299468865688	Description This pair of 20kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates Pair 2 x 25kg, 2 inch Bore	25.0 KG	50 kg	£99.99	In stock	CI-PLT-25KG-NB-P	5299469415288	Description This pair of 25kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 15kg Set, 2 inch Bore	15KG Set	15 kg	£31.99	In stock	CI-PLT-15KG-NB-SET	5299469614360	Description This set of 15kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 45kg Set, 2 inch Bore	45KG Set	45 kg	£89.99	In stock	CI-PLT-45KG-NB-SET	5299469633545	Description This set of 45kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 60kg Set, 2 inch Bore	60KG Set	60 kg	£119.99	In stock	CI-PLT-60KG-NB-SET	5299469719119	Description This set of 60kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 75kg Set, 2 inch Bore	75KG Set	75 kg	£149.99	In stock	CI-PLT-75KG-NB-SET	5299470268248	Description This set of 75kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 100kg Set, 2 inch Bore	100KG Set	100 kg	£199.99	In stock	CI-PLT-100KG-NB-SET	5299470281230	Description This set of 100kg cast iron weight plates is ideal for gradual strength progression and precise load increases.
Cast Iron Olympic Weight Plates 150kg Set, 2 inch Bore	150KG Set	150 kg	£299.99	In stock	CI-PLT-150KG-NB-SET	5299471393833	Description This set of 150kg cast iron weight plates is ideal for gradual strength progression and precise load increases.

Wording shared by more than one row above, printed once here rather than repeated in every row.

Made from solid cast iron for durability and long term use, these plates are suitable for 2 inch (50mm) Olympic barbells and dumbbell handles. Applies to every weight.
The compact design allows easy handling and smooth loading during workouts. Applies to every weight.
Perfect for home gyms and general strength training, they support progressive overload, technique refinement and balanced weight distribution across a wide range of exercises. Applies to every weight.

Size & weight guide

Weight	Diameter	Thickness	Sleeve
1.25 kg	160 mm	12.4 mm	50 mm
2.5 kg	230 mm	16.2 mm	50 mm
5 kg	230 mm	21.7 mm	50 mm
10 kg	270 mm	34.4 mm	50 mm
15 kg	350 mm	34.4 mm	50 mm
20 kg	450 mm	33.6 mm	50 mm
25 kg	450 mm	36.6 mm	50 mm

Read the full guide: Olympic weight plate guide

Feature highlights

Classic Black Finish for Pro Appeal
Matte black cast iron delivers a timeless, rugged look in any setup. Complements racks, bars, and gym flooring, ideal for lifters who prefer a clean, no-nonsense design.

Solid Cast Iron for Heavy-Duty Durability
Made from high-grade cast iron, these Olympic weight plates withstand daily drops and repeated use. Rust-resistant finish helps maintain longevity in any home or garage gym.

Precision-Cut for Safe, Stable Lifting
Each plate features a smooth 2-inch opening for tight, consistent barbell fitting, essential for compound lifts like squats, deadlifts, bench press, and more.

Home Gym & CrossFit Ready
Perfect for home workouts, CrossFit circuits, and strength routines. From beginner sets to serious lifters, this range from 1.25kg to 25kg adapts to all training levels.

Versatile Weight Options, Sold in Pairs or Sets
Available in multiple weights: 1.25kg, 2.5kg, 5kg, 10kg, 15kg, 20kg, 25kg. Mix and match to customise your barbell or dumbbell loading for any fitness goal.

Questions & answers

Will Cast Iron Weight Plates fit my barbell?

Lift Sets Cast Iron Weight Plates have a machined 50mm (2-inch) bore with a stainless steel insert, so they fit any Olympic barbell, EZ curl bar or trap bar with 50mm sleeves. They will not fit 1-inch standard or spinlock bars used with basic dumbbell sets.

What diameter and thickness are the Cast Iron Weight Plates?

Cast Iron Weight Plates measure: 1.25kg 160mm diameter, 12.4mm thick; 2.5kg 230mm, 16.2mm; 5kg 230mm, 21.7mm; 10kg 270mm, 34.4mm; 15kg 350mm, 34.2mm; 20kg 450mm, 33.6mm; 25kg 450mm, 36.6mm. Bare iron is thinner per kilogram than rubber plates, so more weight fits on each sleeve.

Which Cast Iron Weight Plates set should I buy?

Cast Iron Weight Plates sets: 15kg (4×1.25kg, 4×2.5kg) for change plates; 45kg adds 2×5kg and 2×10kg; 60kg (2×5, 2×10, 2×15kg); 75kg (4×1.25, 4×2.5, 2×10, 2×20kg); 100kg (2×5 to 2×20kg); 150kg adds 2×25kg. The 75kg set and above include 20kg pairs.

How much do Cast Iron Weight Plates cost per kilogram?

Cast iron plates are the lowest cost per kilogram of the three Olympic plate formats stocked, below rubber bumper and below tri-grip. The sets work out cheaper per kilogram than buying the same weight as pairs, and the 1.25kg and 2.5kg change plates cost the most per kilogram, as small plates always do. Every set and every pair shows its own price on this page the moment you select it, so the figures you see are always the current ones.

Can I drop Cast Iron Weight Plates?

No. Cast Iron Weight Plates do not absorb impact, so dropping them damages the floor, the bar and the plates. They suit controlled rack work such as squats, bench press, overhead press and rows. For cleans, snatches or dropped deadlifts use Olympic Bumper Weight Plates, and lay rubber matting under your lifting area.

Do I need collars with Cast Iron Weight Plates?

Yes. Collars are not included with Cast Iron Weight Plates. Secure them with Olympic 2" Spring Collars for everyday sets, or quick-release Olympic Barbell Collars for heavy or dynamic lifting, particularly on bench press and overhead work. Each collar product shows its current price on its own page.

How are Cast Iron Weight Plates delivered?

Cast Iron Weight Plates ship free anywhere in Great Britain, including the Scottish Highlands and Islands; Northern Ireland is priced by weight at checkout. Order by 2pm Monday to Friday for same-working-day dispatch; standard delivery takes 2 to 5 working days after dispatch, and express (Great Britain only where available, priced by order weight and shown at checkout) takes 1 to 2 working days. Heavier sets arrive as several parcels.

What are the returns and warranty terms for Cast Iron Weight Plates?

You have 180 days to return Cast Iron Weight Plates. You pay return postage unless it is faulty; if it is faulty or incorrect the return is free. Cover is your statutory consumer rights rather than a separate manufacturer's warranty. Prices include VAT. Klarna is offered at checkout on eligible orders; trade quotes on request.

Can I mix bumper and cast iron plates on the same bar?

Yes. A common set-up is one pair of 20 kg or 25 kg bumpers innermost to put the bar at the correct height from the floor, with cast iron loaded outside them for heavier sets. All Lift Sets plates share the 50 mm bore.

What is in each cast iron plate set?

15 kg set: 4 x 1.25 kg and 4 x 2.5 kg. 45 kg set: 4 x 1.25, 4 x 2.5, 2 x 5 and 2 x 10 kg. 60 kg set: 2 x 5, 2 x 10 and 2 x 15 kg. 75 kg set: 4 x 1.25, 4 x 2.5, 2 x 10 and 2 x 20 kg. 100 kg set: 2 x 5, 2 x 10, 2 x 15 and 2 x 20 kg. 150 kg set: 2 x 5, 2 x 10, 2 x 15, 2 x 20 and 2 x 25 kg.

Which sets include 1.25 kg and 2.5 kg change plates?

The 15 kg, 45 kg and 75 kg sets each include four 1.25 kg and four 2.5 kg plates. The 60 kg, 100 kg and 150 kg sets start at 5 kg pairs, so add change plates if you want 2.5 kg jumps on the bar.

Do the plates have a steel insert?

Yes. Each plate has a stainless steel insert with a precision-machined 50 mm bore that sits snugly on an Olympic sleeve, which stops plates rattling on every rep and reduces wear on the plate and the bar.

What finish do cast iron plates have?

Black powder-coated cast iron with silver lettering. The finish protects the iron, but the plates are not made to be dropped and rust from wet storage is not covered by the warranty.

Are cast iron plates sold in pairs?

Yes. Choose Pairs and a weight from 1.25 kg to 25 kg to get two plates, or choose Sets for a graded set from 15 kg to 150 kg. Prices are shown on the product page.

Why choose cast iron for heavy loading?

Iron is denser than rubber, so a cast iron plate is thinner per kilogram: the 25 kg plate is 36.6 mm thick against 60 mm for the rubber tri-grip and 81 mm for the bumper. On a 39 cm sleeve that is the difference that lets you fit a heavy squat or deadlift on the bar.

Delivery, returns and warranty are answered in full on the delivery page, in the Help centre and on the warranty page.

Warranty

Category	Free weights
Term	Statutory rights apply; manufacturer terms confirmed on request
Covers	Casting defects, coating that lifts or cracks without impact, handles that come loose from the head, adjustable mechanisms that fail under normal use. This guarantee is given by LIFT SETS LTD, Unit at St. Helens, Merseyside, and does not affect your statutory rights under the Consumer Rights Act 2015.
Not covered	Chips and scuffs from dropping, rust from wet storage, cosmetic marks, use in commercial settings unless quoted. Exclusions never remove your statutory rights: a fault that was present at delivery is covered whatever the exclusions say.
How to claim	Email support@liftsets.co.uk with your order number, a description of the fault and two or three photos or a short video. We reply with the next step: replacement part, repair, replacement or refund. Damage or shortages on arrival are a delivery claim, not a warranty claim: tell us as soon as you can.

Your statutory rights under the Consumer Rights Act 2015 apply in full: up to 30 days to reject a faulty item for a refund, then repair or replacement, and for six months a fault is presumed to have been present at delivery. Full details: Warranty.

Delivery & shipping

Free delivery to every address in Great Britain, including the Scottish Highlands and Islands. Northern Ireland is priced by weight at checkout. · 2–5 working days
Order before 2pm for same-working-day dispatch (Mon–Fri)
180-day returns · no restocking fee · you pay return postage unless faulty

Delivery policy · Returns policy · Warranty