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+---
+title: "Standards"
+task: ""
+lineage_type: import
+upstream_source: https://github.com/K-Dense-AI/scientific-agent-skills/blob/b2a92ba0/skills/lab-hardware-cad/assets/standards.json
+upstream_sha: b2a92ba0
+imported_at: 2026-08-14
+prompt_class: unknown
+upstream_changes: accepted
+author: upstream
+validated: false
+---
+
+{
+  "schema_version": "1.0",
+  "units": "mm",
+  "note": "Dimensional standards for lab-hardware interfaces. Every entry carries a source. Entries with verified=false were not confirmed against the primary document during authoring and must be checked before use.",
+  "last_reviewed": "2026-08-13",
+  "standards": {
+    "slas-microplate-footprint": {
+      "title": "Microplate footprint (base outline)",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 1-2004 (R2012) Footprint Dimensions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_1-2004_FootprintDimensions.pdf",
+      "verified": true,
+      "dimensions": {
+        "footprint_length": {
+          "nominal": 127.76,
+          "tol_plus": 0.25,
+          "tol_minus": 0.25,
+          "note": "Measured within 12.7 mm of the outside corners. Relaxes to +/-0.5 mm at any point along the side."
+        },
+        "footprint_width": {
+          "nominal": 85.48,
+          "tol_plus": 0.25,
+          "tol_minus": 0.25,
+          "note": "Measured within 12.7 mm of the outside corners. Relaxes to +/-0.5 mm at any point along the side."
+        },
+        "corner_radius": {
+          "nominal": 3.18,
+          "tol_plus": 1.6,
+          "tol_minus": 1.6,
+          "note": "Outside radius of the four bottom-flange corners. The wide tolerance means a pocket must be cut to the maximum radius, not the nominal."
+        }
+      },
+      "fit_checks": [
+        {"measure": "bbox_x", "dimension": "footprint_length"},
+        {"measure": "bbox_y", "dimension": "footprint_width"}
+      ],
+      "design_note": "For a pocket that receives a plate, add clearance per side on top of the maximum material condition (127.76 + 0.25 = 128.01). Check the pocket, not the plate."
+    },
+    "slas-microplate-height": {
+      "title": "Microplate height",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 2-2004 (R2012) Height Dimensions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_2-2004_HeightDimensions.pdf",
+      "verified": true,
+      "dimensions": {
+        "plate_height": {
+          "nominal": 14.35,
+          "tol_plus": 0.25,
+          "tol_minus": 0.25,
+          "note": "Datum A (resting plane) to the maximum protrusion of the perimeter wells. Secondary sources also quote +/-0.76 mm; consult the document before relying on the tighter band. Lidded and deep-well plates are taller and out of scope of this dimension."
+        }
+      },
+      "fit_checks": [
+        {"measure": "bbox_z", "dimension": "plate_height"}
+      ]
+    },
+    "slas-microplate-flange": {
+      "title": "Microplate bottom outside flange height",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 3-2004 (R2012) Bottom Outside Flange Dimensions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_3-2004_BottomOutsideFlangeDimensions.pdf",
+      "verified": true,
+      "dimensions": {
+        "flange_height_short": {"nominal": 2.41, "tol_plus": 0.38, "tol_minus": 0.38},
+        "flange_height_medium": {"nominal": 6.10, "tol_plus": 0.38, "tol_minus": 0.38},
+        "flange_height_tall": {"nominal": 7.62, "tol_plus": 0.38, "tol_minus": 0.38}
+      },
+      "fit_checks": [],
+      "design_note": "Three flange heights are standardised. A gripper or carrier that assumes one will drop plates built to another. Ask which the user has."
+    },
+    "slas-well-positions-96": {
+      "title": "96-well plate well positions",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 4-2004 (R2012) Well Positions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_4-2004_WellPositions.pdf",
+      "verified": true,
+      "dimensions": {
+        "well_pitch": {"nominal": 9.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Centre-to-centre in both x and y."},
+        "a1_offset_x": {"nominal": 14.38, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Left outside edge to the centre of column 1."},
+        "a1_offset_y": {"nominal": 11.24, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Top outside edge to the centre of row A."},
+        "well_position_tolerance": {"nominal": 0.70, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Each well centre lies within a 0.70 mm diameter of nominal. This is a positional tolerance zone, not a +/- band."}
+      },
+      "fit_checks": [],
+      "design_note": "Grid layout: x = a1_offset_x + 9.0 * column_index, y = a1_offset_y + 9.0 * row_index, measured from the plate outline corner."
+    },
+    "slas-well-positions-384": {
+      "title": "384-well plate well positions",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 4-2004 (R2012) Well Positions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_4-2004_WellPositions.pdf",
+      "verified": false,
+      "dimensions": {
+        "well_pitch": {"nominal": 4.5, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Centre-to-centre in both x and y."},
+        "a1_offset_x": {"nominal": 12.13, "tol_plus": 0.0, "tol_minus": 0.0, "note": "UNVERIFIED. Derived as the 96-well offset minus half the 96-well pitch. Confirm against ANSI/SLAS 4-2004 before cutting metal."},
+        "a1_offset_y": {"nominal": 8.99, "tol_plus": 0.0, "tol_minus": 0.0, "note": "UNVERIFIED. Derived, as above. Confirm against the document."}
+      },
+      "fit_checks": [],
+      "design_note": "Only well_pitch is confirmed here. Read the standard for the A1 offsets before relying on them."
+    },
+    "slas-well-positions-1536": {
+      "title": "1536-well plate well positions",
+      "authority": "ANSI/SLAS",
+      "document": "ANSI/SLAS 4-2004 (R2012) Well Positions",
+      "url": "https://www.slas.org/SLAS/assets/File/public/standards/ANSI_SLAS_4-2004_WellPositions.pdf",
+      "verified": false,
+      "dimensions": {
+        "well_pitch": {"nominal": 2.25, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Centre-to-centre in both x and y."},
+        "a1_offset_x": {"nominal": 11.005, "tol_plus": 0.0, "tol_minus": 0.0, "note": "UNVERIFIED. Derived from the 96-well offset. Confirm against ANSI/SLAS 4-2004."},
+        "a1_offset_y": {"nominal": 7.865, "tol_plus": 0.0, "tol_minus": 0.0, "note": "UNVERIFIED. Derived, as above. Confirm against the document."}
+      },
+      "fit_checks": [],
+      "design_note": "Only well_pitch is confirmed here."
+    },
+    "cuvette-standard-10mm": {
+      "title": "Standard 10 mm path-length spectrophotometer cuvette",
+      "authority": "De facto industry convention",
+      "document": "No single ANSI/ISO document fixes this; it is a near-universal convention across suppliers.",
+      "url": "https://spectrecology.com/blog/guide-to-cuvettes/",
+      "verified": true,
+      "dimensions": {
+        "external_width": {"nominal": 12.5, "tol_plus": 0.1, "tol_minus": 0.1, "note": "Tolerance is indicative; suppliers vary."},
+        "external_depth": {"nominal": 12.5, "tol_plus": 0.1, "tol_minus": 0.1},
+        "external_height": {"nominal": 45.0, "tol_plus": 0.5, "tol_minus": 0.5, "note": "Body height excluding any cap or stopper. Semi-micro and micro cuvettes share the external footprint but differ in height and internal geometry."},
+        "path_length": {"nominal": 10.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Internal optical path. 12.5 external minus 2 x 1.25 mm wall."},
+        "wall_thickness": {"nominal": 1.25, "tol_plus": 0.0, "tol_minus": 0.0}
+      },
+      "fit_checks": [
+        {"measure": "bbox_x", "dimension": "external_width"},
+        {"measure": "bbox_y", "dimension": "external_depth"}
+      ],
+      "design_note": "Because this is a convention rather than a standard, a holder should be designed with generous clearance or a compliant feature. Confirm against the user's actual cuvettes."
+    },
+    "optical-breadboard-metric": {
+      "title": "Metric optical breadboard hole grid",
+      "authority": "De facto industry convention",
+      "document": "Universal across Thorlabs, Newport, Edmund and others for metric tables.",
+      "url": "https://www.thorlabs.com/imperial-and-metric-threading",
+      "verified": true,
+      "dimensions": {
+        "grid_pitch": {"nominal": 25.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Metric grid. NOT interchangeable with the 25.4 mm imperial grid."},
+        "thread": {"nominal": 6.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "M6 x 1.0 tapped holes."},
+        "clearance_hole_close": {"nominal": 6.4, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Close-fit clearance for an M6 cap screw."},
+        "clearance_hole_normal": {"nominal": 6.6, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Normal-fit clearance for M6. Prefer this on printed parts."},
+        "counterbore_dia": {"nominal": 11.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "For an M6 socket head cap screw head (nominal head dia 10 mm)."},
+        "border": {"nominal": 12.5, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Typical edge-to-first-hole distance."}
+      },
+      "fit_checks": [],
+      "design_note": "Slot rather than hole one of any pair of mounting features to absorb grid and print tolerance."
+    },
+    "optical-breadboard-imperial": {
+      "title": "Imperial optical breadboard hole grid",
+      "authority": "De facto industry convention",
+      "document": "Universal across Thorlabs, Newport, Edmund and others for imperial tables.",
+      "url": "https://www.thorlabs.com/imperial-and-metric-threading",
+      "verified": true,
+      "dimensions": {
+        "grid_pitch": {"nominal": 25.4, "tol_plus": 0.0, "tol_minus": 0.0, "note": "1 inch exactly. Over four holes this differs from the metric grid by 1.6 mm."},
+        "thread_major_dia": {"nominal": 6.35, "tol_plus": 0.0, "tol_minus": 0.0, "note": "1/4-20 UNC: 0.25 inch major diameter, 20 threads per inch."},
+        "clearance_hole_normal": {"nominal": 6.8, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Normal-fit clearance for a 1/4-20 screw."},
+        "counterbore_dia": {"nominal": 11.2, "tol_plus": 0.0, "tol_minus": 0.0, "note": "For a 1/4-20 socket head cap screw head."},
+        "border": {"nominal": 12.7, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Typical 0.5 inch edge-to-first-hole distance."}
+      },
+      "fit_checks": [],
+      "design_note": "Ask which table the user has. Assuming the wrong system is the most common optomechanical design error."
+    },
+    "cage-system-30mm": {
+      "title": "30 mm cage system",
+      "authority": "Thorlabs (de facto standard, second-sourced by others)",
+      "document": "Thorlabs 30 mm cage system construction rods and cage plates",
+      "url": "https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_ID=2273",
+      "verified": true,
+      "dimensions": {
+        "rod_spacing": {"nominal": 30.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Rod centre to rod centre, on a square pattern. 1.18 inch."},
+        "rod_diameter": {"nominal": 6.0, "tol_plus": 0.0, "tol_minus": 0.0, "note": "ER series cage rods."},
+        "rod_bore_clearance": {"nominal": 6.1, "tol_plus": 0.0, "tol_minus": 0.0, "note": "Suggested bore for a printed plate to slide on 6 mm rods. Widen for FDM; see fabrication-limits.md."},
+        "plate_thickness_typical": {"nominal": 8.9, "tol_plus": 0.0, "tol_minus": 0.0, "note": "0.35 inch, the CP33 standard cage plate. Not a constraint on custom plates, but matching it keeps optical path budgets simple."}
+      },
+      "fit_checks": [],
+      "design_note": "The 30 mm rod square is centred on the optical axis. A custom plate must place its aperture at the centroid of the four rod bores."
+    },
+    "sm1-lens-tube-thread": {
+      "title": "SM1 lens tube thread",
+      "authority": "Thorlabs (de facto standard)",
+      "document": "Thorlabs SM1 series threading",
+      "url": "https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=4114",
+      "verified": true,
+      "dimensions": {
+        "thread_major_dia": {"nominal": 26.289, "tol_plus": 0.0, "tol_minus": 0.0, "note": "1.035 inch-40 thread. Holds 1 inch diameter optics."},
+        "threads_per_inch": {"nominal": 40.0, "tol_plus": 0.0, "tol_minus": 0.0},
+        "pitch": {"nominal": 0.635, "tol_plus": 0.0, "tol_minus": 0.0, "note": "25.4 / 40 mm."},
+        "optic_dia": {"nominal": 25.4, "tol_plus": 0.0, "tol_minus": 0.0, "note": "1 inch optic."}
+      },
+      "fit_checks": [],
+      "design_note": "A 40 TPI thread has a 0.635 mm pitch, which is at or below the resolution of most FDM printers. Print a clearance bore and use a purchased SM1 adapter or a tapped insert rather than printing the thread."
+    }
+  }
+}