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SPI Finish Standards

Exact micro-inch Ra tolerances across all standard grades.

Complete coverage from SPI A-1 mirror finishes under 1 Ra down to SPI D-3 dry blast textures, executed at our Longmont facility.

< 1 Ra

SPI A-1 diamond grade

100%

profilometer verified

A-1 to D-3

full classification range

Classification Breakdown

Diamond, paper, and stone finishing protocols.

Systematic grit progressions designed to protect sharp shut-offs and eliminate parting-line washouts.

Grade A
Grade B
Grade C

High-Gloss Diamond Buffing

Fine Paper Finishing

Grit Stone Standards

Graded diamond compounds on felt or hard wood bobs delivering SPI A-1, A-2, and A-3 mirror finishes.

Precision silicon carbide paper progression achieving SPI B-1, B-2, and B-3 semi-gloss surface textures.

Hand-stoned abrasive bench finishing calibrated for SPI C-1, C-2, and C-3 matte component requirements.

Quality Assurance

Every cavity insert undergoes rigorous surface roughness verification using calibrated profilometer readings and certified comparator references before shipping.

Quality Engineering Protocol, Longmont CO

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Match your print callouts to our finishing standards.

Send tool steel grades, core geometry, and target Ra values for immediate technical evaluation.