The Series AA-420 hardened and ground tri-squares represent precision engineering excellence for industrial measurement requirements. Manufactured from single-piece, fully seasoned...

The Series AA-420 hardened and ground tri-squares represent precision engineering excellence for industrial measurement requirements. Manufactured from single-piece, fully seasoned fine quality steel, these tools undergo comprehensive hardening processes to achieve 58 (±2) Rc hardness, ensuring exceptional durability and wear resistance. Each square features precisely lapped beams and blades that maintain straightness and parallelism within tight tolerances. The precision ground surfaces deliver reliable right angle measurements both internally and externally, making them indispensable tools for professionals who demand uncompromising accuracy in their daily operations. Available in multiple sizes to accommodate various measurement needs from 0-75mm to 0-125mm jaw openings, these tools provide versatile solutions for diverse industrial measurement challenges.

These precision measurement instruments serve critical functions across multiple industrial sectors including metal fabrication, precision machining, automotive manufacturing, and construction industries. In metalworking facilities, they ensure components are fabricated to exact specifications with perfect right angles and dimensional accuracy. Machining centers utilize them for quality control verification of machined parts and dimensional inspection. Automotive manufacturers rely on them for assembly alignment verification and quality assurance checks, while construction professionals use them for verifying structural squareness and alignment precision. The tools' hardened construction makes them suitable for demanding workshop environments where less robust tools would quickly lose accuracy and performance reliability.

The business value of these tri-squares lies in their operational reliability and long-term cost efficiency. By investing in precision tools that maintain accuracy over extended periods, businesses significantly reduce measurement errors that can lead to expensive rework, material waste, and production delays. The hardened construction ensures consistent performance even with intensive daily use, providing excellent return on investment through reduced replacement costs and enhanced measurement reliability. Each tool comes individually packaged in protective wooden boxes for secure storage and transportation, demonstrating our commitment to product integrity and customer satisfaction. The robust design and precision engineering translate to measurable improvements in production quality and operational efficiency for businesses across industrial sectors.

Key Features:
- Manufactured from single-piece fully seasoned fine quality steel for maximum structural integrity
- Precision ground surfaces ensure accurate right angle measurements both inside and outside
- Beams and blades accurately lapped to maintain straightness and parallelism within tight tolerances
- Fully hardened to 58 (±2) Rc for superior wear resistance and extended service life
- Grooved inner corner design prevents debris accumulation during operational use

Benefits:
- Enhanced measurement accuracy reduces production errors and material waste
- Durable hardened construction ensures long-term reliability and cost efficiency
- Versatile application across multiple industrial sectors and measurement requirements
- Consistent performance maintains precision even in demanding workshop environments
- Protective packaging ensures tool integrity during storage and transportation