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12 Hole 15 Notch General Purpose Eddy Current Bolt Hole Standard Block Geometry: Block Sizes: 0.25" thick x 2.5" x 6.0" Holes: 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8" and 3/4" diameter Surface Notches: Qty 3 @ .008", .020" and .040" deep x 1.0" long Notch Width (All): .004" (± .001) Hole Notch Configurations: (1) .030" x .030" (45°) corner notch @ .004" wide in each hole (Qty 12) (1) .020" full-bore (thru) notch @ .004" wide in each hole - (Qty 12) (1) Full-bore (thru) notch @ .020" deep x .004" wide and (1) .030" x .030" (45°) corner notch @ .004" in each hole, 180° apart (Qty 24) (1) Mid-bore notch @ .030" deep x .004" wide x .060" long in each hole - (Qty 12).

3 Notch Eddy Current Standard Block-Eddy Current Calibration Blocks 3-Notch Eddy Current Standard Block Geometry:contains (3) surface notches at depths of .008", .020", and .040". Notch width typically .004" to .005", with other widths possible. Dimensions: .250" x 1.0" x 3.0"

DAC GSET Eddy Current Standard Block Geometry: Overall dimensions: .250/.625" thick x 2.000" wide x 6.375" long bare Contains: (2) fastener holes, (11) EDM notches, (1) end with a .250" radius Part No: AL.01 Manufactured IAW McDonnell Douglas NDT Manual 06-20-01, Pages F1 to F3, Figure 1.

MIL-STD-271F Reference Block The Performance Verification Reference Block meets the requirements of MIL-STD-271F, Paragraph 7.4.2. Block contains a simulated butt weld and (4) EDM notches. Manufactured IAW MIL-STD-271F, Paragraph 7.4.2. Geometry: Overall dimensions: 3/8" thick x 4.0" wide x 6.0" long bare Contains: (4) EDM notches @ .015" deep x .010" max wide x .250" long Manufactured IAW MIL-STD-271F, Paragraph 7.4.2.

Navy Eddy Current Standard Block Geometry: Overall Dimensions: .875" thick x 4.0" wide x 7.0" long. Material: Carbon Steel. (20) Fastener Holes from .156 to .750" diameter. (40) Corner notches, (20) Bore notches, (9) Surface notches, (1) Tapered notch, (1) Radius notch All EDM notches are .004 ± .001 wide Manufactured IAW U.S.A.F. Tech Order 33B-1-1, Figure 4-40. P/N NRK-3A. Navy Universal Eddy Current Standard. A (3) plate assembly containing (20) fastener holes with a total of (71) EDM notches in various locations.

USAF Eddy Current Standard Block USAF General Purpose Eddy Current Standard Block Geometry: Overall Dimensions: 1.06" thick x 4.0" wide x 7.0" long Alloy: 4340 Steel, clear anodized (20) Fastener Holes from .156 to .750" diameter. (40) Corner notches, (20) Bore notches, (4) Surface notches (1) Tapered notch, (1) Radius notch All EDM notches are .004 ± .001 wide Finished standard is anodized per MIL-A-8625 Manufactured IAW U.S.A.F. Tech Order 33B-1-1, Figure 4-39. NSN 6635-01-092-5129 and P/N 7947479-10.