Part Number
Definition:
A FLAT, TRANSPARENT PIECE OF GLASS, GENERALLY OF FUSED QUARTZ, WITH ONE OR BOTH PRINCIPAL SURFACES POLISHED TO WITHIN A FEW MILLIONTHS OF AN INCH OF A TRUE PLANE. IT IS USED IN CONJUNCTION WITH A MONOCHROMATIC LIGHT SOURCE TO MEASURE THE FLATNESS OF PRECISION FINISHED SURFACES, AND TO DETERMINE THE DISTANCE AND PARALLELISM BETWEEN PRECISION FINISHED SURFACES BY COMPARISON WITH KNOWN STANDARDS. IN OPERATION THE FLAT IS SUPERIMPOSED, REFERENCE SURFACE DOWNWARD, ON THE PARTS UNDER TEST AND WHEN ILLUMINATED BY MONOCHROMATIC LIGHT THE RAYS REFLECTED FROM THE REFERENCE SURFACE ARE EITHER REINFORCED OR NEUTRALIZED BY THE RAYS REFLECTED FROM THE SURFACE UNDER TEST PRODUCING INTERFERENCE BANDS WHICH REVEAL ANY VARIATIONS IN THE THICKNESS OF THE FILM OF AIR BETWEEN SURFACE UNDER TEST AND THE FLAT. EXCLUDES OPTICAL PARALLELS.
CAGE Information
| Code | Company |
|---|---|
| 71724 | JOHN CRANE INC |
Federal Supply Class
Title
MEASURING TOOLS, CRAFTSMEN'S
Inclusions:
INCLUDES CALIPERS; LEVELS; MICROMETERS; PLUMB BOBS; PRECISION TAPES; SQUARES; ANGLE GAGES; CENTER GAGES; DEPTH GAGES; DRAW GAGES; DRILL POINT GAGES; FILLET AND RADIUS GAGES; GLAZIERS' GAGES; HEIGHT GAGES (VERNIER); PLANER GAGES; RIVET SELECTOR GAGES; SAW TOOTH SET GAGES; SCREW PITCH GAGES; SURFACE GAGES; TELESCOPING GAGES; THICKNESS GAGES; TUBE BEAD GAGES; TUBE FLARE GAGES; TWIST DRILL GAGES; TWIST DRILL AND ROD GAGES; TWIST DRILL AND TAP GAGES; TAPER-WIRE-THICKNESS GAGES; WIRE GAGES; TOOL SETTING PLANER AND SHAPER GAGES; GAGE BLOCKS.
Exclusions:
Characteristics (Decoded)
| MRC | Requirements Statement | Clear Text Reply |
|---|---|---|
| FEAT | SPECIAL FEATURES | OPTICAL,FLAT |