Spirotherm 21-151-6 Countersink Gage 100 Degree

Product Description

The SPIROTHERM 21-151-6 is a countersink gage designed to measure and verify countersink angles in machined or fabricated workpieces. Built from hardened tool steel, this gage delivers an accuracy of 0.0005 inches, making it suitable for precision inspection work in manufacturing, fabrication, and mechanical assembly environments. It checks 100-degree countersink geometry against finished hole features. Machinists, tool-and-die technicians, and quality control inspectors use this type of instrument to confirm that countersunk holes meet spec before fastener installation or part acceptance.

The 21-151-6 is suited for shop-floor and inspection-bench use wherever 100-degree countersink angles must be verified. Typical applications include aerospace component inspection, sheet metal fabrication, and general precision machining. The hardened tool steel construction resists wear in high-use environments and maintains calibration integrity over extended service cycles. This gage fits into standard quality assurance workflows for parts that require flush or near-flush fastener seating.

Key Features

• 100-degree countersink angle measurement for common aerospace and fastener-standard geometries
• 0.0005 inch accuracy supports tight tolerance inspection requirements
• Hardened tool steel construction resists wear and maintains long-term dimensional stability
• Compact form factor suits both bench inspection and in-process shop-floor checks

Compatibility

Designed for use in precision inspection of 100-degree countersink features in machined components across general manufacturing and fabrication applications.

Installation Notes

This is a hand-held inspection gage, not a permanently installed component. No power source, fasteners, or special mounting hardware are required for normal use. Keep the contact surfaces clean and free of chips or debris before each measurement to maintain accuracy. Periodic calibration against a certified reference standard is recommended per your facility quality plan.