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Cast Iron Calibration / Testing Block Weights

Our Price: £435.00 – £2,625.00 + VAT (£522.00 - £3,150.00 inc VAT)

High Quality Block Weights

1 certificate is required per weight

Do you require a Calibration Certificate? (High Capacity Block Weight)

Price: £95

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Description

High-Capacity Cast Iron Block Weights for Industrial Calibration & Proof Load Testing

Built for precision, compliance, and extreme durability — these M1-class cast iron block weights are the trusted choice across UK industries for scale calibration, LOLER proof load testing, and regulated weighing.

Why Choose Our Cast Iron Block Weights?

Whether you’re calibrating large-capacity industrial scales or performing heavy-duty load tests, our cast iron block weights offer the reliability and compliance you need. Engineered from dense, shot-blasted cast iron and finished with a durable, chip-resistant coating, each weight is designed for long-term use in harsh working environments.

With stackable construction and forklift compatibility, these weights are easy to manoeuvre and store safely. Every unit is clearly marked with its nominal value, ensuring quick identification during audits or calibration checks.

Trusted for Accuracy and Legal Compliance

  • OIML Class M1 certified for use with non-automatic weighing instruments with ≥1g readability

  • Precision tolerance of ±0.005% for consistent, verifiable results

  • Compliant with UK regulations, including:

    • Non-Automatic Weighing Instruments Regulations 2016 (Trade Use)

    • LOLER 1998 (Proof Load Testing of Lifting Equipment)

These weights are also available with an optional Trading Standards calibration certificate, ensuring full traceability and providing documented accuracy for regulated industries. This is ideal for businesses undergoing audits or working with third-party inspectors.

Applications Across Key UK Sectors

These high-capacity weights are not general-purpose — they are specialised tools that directly support regulatory compliance, risk reduction, and process efficiency:

  • Manufacturing – Bulk ingredient weighing and finished goods control

  • Warehousing & Logistics – Calibration of platform and pallet truck scales

  • Transport & Freight – Verification of weighbridges and axle weighers

  • Construction – LOLER-compliant proof load testing of cranes and hoists

  • Pharma & Food Production – Ingredient accuracy for batch processing

  • Mining & Heavy Industry – Verification of large-scale weighing systems and lifting gear

Need UKAS traceability or specific calibration documentation? We can tailor to your compliance needs — just ask.

Product Options & Specifications

Capacity (kg) OIML Class Material Key Features
100 M1 Cast Iron Stackable, Forklift Compatible, Coated Finish
250 M1 Cast Iron Stackable, Forklift Compatible, Coated Finish
500 M1 Cast Iron Stackable, Forklift Compatible, Coated Finish
1000 M1 Cast Iron Stackable, Forklift Compatible, Coated Finish

Please note: Images are for reference only. For actual product photos, please contact us.

FAQs

Are these weights legal for trade use in the UK?
Yes. All options meet OIML Class M1 requirements and are suitable for trade use under the NAWI Regulations 2016.

Can they be used for LOLER proof load testing?
Absolutely. Their design and capacity make them ideal for verifying lifting equipment safety in line with LOLER 1998.

Do you provide calibration certificates?
Yes. We offer Trading Standards traceable calibration certificates upon request.

Drawings

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We endeavour to deliver your goods to you as fast as we can. A large percentage of our orders are delivered in 3 - 5 working days (all mainland UK postcodes except IV, AB and KW) but some goods can take longer if they are delivered direct from the manufacturer or if the item is made to order. Please note, IV, AB and KW postcodes and non-mainland UK including Northern Ireland can take longer. Please give us a call if your order is urgent to verify the delivery time or see if a faster delivery is possible (additional costs may apply for larger orders).

The following delivery charges may apply per order:
  • £12.00 + VAT – Mainland UK
  • £30.00 + VAT – UK non-mainland

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Frequently Asked Questions

Please see below for answers to frequently asked questions.

A calibration certificate proves the accuracy of your weighing equipment. It is very likely that if accuracy matters in your workplace, certification will be required by your industry regulators. They are straightforward to get hold of though. Just ask our team.

If you are trading or transacting anything by weight, you will probably need to demonstrate your weighing equipment is verified for trade use. This gives your customers confidence in your business and will make sure buying and selling run smoothly. We can help get you with relevant approvals for your equipment.

The answer will vary depending on how your equipment is used. As a minimum, we typically recommend once a year but our team can provide advice based on your individual circumstances.

The International Organization of Legal Metrology (OIML) has established standards for the classification of calibration test weights. Varying from E0 & E1, which are the most accurate to M2 which are commonly used for calibrating platform scales, floor scales and other industrial weighing instruments.

As a rough guide we have listed desired accuracy against class below.

+/- 0.1% – UNclassed Proof Load Test Weights
+/- 0.05% – M3 (Check/calibrate coarse scales)
+/- 0.005% – M1 (Check/calibrate standard scales)
+/- 0.0015% – F2 (Check/calibrate portable balances)
+/- 0.0005% – F1 (Check/calibrate precision balances)
+/- 0.00015% – E2 (Check/calibrate analytical balances)

The choice of weight class depends on the intended use and the level of accuracy required for a particular application. If you’re unsure, talk to our team who can advise you on the right class for your equipment.

If you’re sending a scale back to us for recalibration, it is ideal to use the original packaging. If this is not available choose a sturdy well-padded box to avoid shocks. Where possible, protect the load sensor by removing the weighing pan and any under-pan support and pack these separately in the box. You may be able to use the equipment’s locking pins or screws too.

Do ensure all the paperwork, including your contact details, is included to ensure we can return it once calibration is complete.

Need help? Speak to one of our experts Contact Us

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