Precision 1-2-3 Clamping Blocks Set of 2 – Hardened Steel 23 Holes Metric & Imperial, 0.0001" Accuracy for Machining Milling & Workshop Setup

Precision 1-2-3 Clamping Blocks – The Machinist’s Essential Reference Tool

When accuracy is everything, these precision 1-2-3 clamping blocks deliver. Supplied as a matched set of two, these hardened steel blocks are ground and hardened on all six sides to an exceptional accuracy of 0.0001” – making them an indispensable reference tool for any serious machinist, toolmaker, or workshop engineer.

Available in both metric (25-50-75mm) and imperial (1-2-3 inch) dimensions, these versatile hexahedron blocks are used for set-up, layout, and inspection jobs across a wide range of machine tools. The 23-hole pattern – including 5 threaded 3/8-16 clamping holes and 18 additional holes – gives you maximum flexibility for fixturing and workholding applications.

Key Features

• 🔧 0.0001" Accuracy – Ground and hardened on all six sides for exceptional precision
• 📦 Set of 2 Matched Blocks – Supplied as a pair for consistent referencing
• 🔩 23 Holes – 5 threaded 3/8-16 clamping holes + 18 additional holes
• 📐 Metric & Imperial – 25-50-75mm / 1-2-3 inch dimensions
• ⚙️ Hardened Steel Construction – Scratch-resistant, durable, and long-lasting
• 🎯 Multi-Purpose – Ideal for set-up, layout, inspection, machining, and milling

Specifications

Frequently Asked Questions

Q: What are 1-2-3 blocks used for in machining?
A: 1-2-3 blocks are precision reference tools used to set up workpieces on machine tools, mills, and lathes. They provide accurate, repeatable positioning for set-up, layout, and inspection tasks in the workshop.

Q: Are these blocks compatible with standard milling machine fixtures?
A: Yes – the 3/8-16 threaded holes are a standard size compatible with most milling machine clamping hardware and fixturing systems.

Q: Are these a good gift for a machinist or engineer?
A: Absolutely – a quality set of precision 1-2-3 blocks makes an excellent gift for machinists, toolmakers, engineers, or anyone who works with machine tools professionally or as a hobby.

Q: What is the difference between the 23 holes?
A: The 23 holes consist of 5 threaded 3/8-16 holes for clamping and 18 additional unopened holes, giving you flexibility for a wide range of fixturing and workholding setups.

Q: Can these blocks be used for inspection and layout work?
A: Yes – the 0.0001" accuracy and ground-on-all-sides construction make these blocks equally suitable for precision inspection, layout, and gauging tasks as well as machining set-up.

Q: Are these blocks supplied as a matched pair?
A: Yes, the set includes 2 matched precision blocks, ensuring consistent dimensions and accuracy across both pieces for reliable referencing and set-up work.

Fast UK Shipping

Ships from our UK warehouse. Enjoy free delivery in 1–4 business days across the UK. Order today and elevate your workshop precision.