Perforated metal standard round-hole patterns: hole diameter × center pitch, 60° staggered, open area % and gauge (McNichols, Hendrick, EDCON) + 60 × 45 mm sample plates — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/perforated-metal-round-hole-standard-patterns/ (sheet CC BY 4.0) Basis: McNichols item pages (10 items, all 60° staggered, with gauge, holes per square inch and bar width), Hendrick's round-hole patterns and EDCON Steel's metric stock list; open area cross-checked with 90.69 × (d/c)²; six sample plates as files Catalog version: 2026-10-20 Overall (mm): length 60.0, width 45.0, height 4.76 - A perforated pattern is named by hole diameter and centre-to-centre pitch, for example 1/8 on 3/16 (also written 1/8 dia. on 3/16 centres). On 60° staggered centres every hole has six neighbours at the same distance: adjacent rows are offset by half a pitch and the row spacing is pitch × sin 60° (0.866 × pitch). Straight (square) centres put holes in a square grid. McNichols also names 45° staggered. Bar width is pitch − diameter (the solid web between neighbouring holes, called the ligament here); McNichols prints it as 'bar width'. - Open area for 60° staggered round holes is 90.69 × (d / c)² percent; the column headed 'cross-check' is that formula computed here and is used only to check the printed value, not as a source. It agrees (within rounding) for every McNichols row (1/4 on 3/8 gives 40.3 against 40 printed; 1/2 on 11/16 gives 48.0 against 48; 3/16 on 5/16 gives 32.7 against 33), for the Hendrick rows and for all EDCON rows except 3.25 mm holes on 4.78 mm, which the list prints as both 40% (R03240) and 41% (R03341) while the formula gives 41.9; if you need exact open area for that pattern check the maker's drawing. Hendrick's page does not say which of its patterns are straight or staggered; the numbers fit the 60° formula, so they are probably staggered, which this page does not assert. Accurate Perforating's calculator page offers three formulas (60° staggered, 45° staggered, straight) but its constants are in images and were not read. - Gauge: McNichols calls 3/16 in and thicker 'plate' and 11 gauge and lighter 'sheet'. The thickness for the same gauge number differs by material (16 gauge is 0.0635 in galvanized, 0.0500 in aluminum, 0.0598 in polypropylene on the pages read; 14 gauge is 0.0747 in carbon steel; 11 gauge is 0.1250 in 316L stainless and 0.1196 in polypropylene). Use the thickness column, not the gauge number, for a model. A pattern is usually stocked in several gauges: the 1/8 on 3/16 pattern appears on five McNichols items (four materials) above. - EDCON Steel's list is metric and Australian: diameter, centres in mm, stock codes by material (mild steel, galvanised, stainless 304 / 316, aluminium, zincanneal). Its thickness columns did not align in the text read, so thickness is not shown for those rows. Only the mild steel rows are listed; the same pattern codes recur in the other materials with the same or nearly the same dimensions (R02440 is 2.41 on 3.66 mm in mild steel and 2.38 on 3.57 mm in the other materials). The inch column converts mm ÷ 25.4 (computed); the Hendrick and McNichols rows convert inch × 25.4 (computed). - Files: six 60 × 45 mm sample plates (Xem's choice of plate size) with the pattern drawn as published: hole Ø and pitch as printed, 60° staggered, rows along the plate length (McNichols: 'straight rows parallel to the plate length'), thickness as the named McNichols item lists it. Holes are placed only where the whole circle plus half a ligament fits inside the plate, then the pattern is centred; real sheet has solid margins that vary by supplier and sheet size (McNichols: a solid margin on one side, sheared-through on the other), so the sample's margin is a result of the pattern and not a published figure. Square and 45° staggered patterns, slots and designer patterns are not drawn. Perforated sheet is sold in 4 × 8 ft and similar sheets; McNichols lists 24 × 24, 48 × 30 and 48 × 120 in for item 16143831. Tri-clamp screen discs: tri-clamp-screen-gaskets; hole-and-pitch grid for hooks: pegboard-standard. - McNichols publishes a spec sheet and CAD drawing PDF per item (DWG needs a login); the item page is linked, nothing is copied. source / item hole diameter centers (pitch) pattern open area % (printed) cross-check 90.69 × (d/c)² (computed, 60° stagger) gauge / thickness; material holes per sq in (printed) bar width (printed) metric / inch conversion (computed) McNichols item 16111820 1/16 in 1/8 in 60° staggered (as printed) 23 22.7 20 gauge .0359 in; carbon steel 74.97 1/16 in 1.59 on 3.17 McNichols item 16183114 1/8 in 3/16 in 60° staggered (as printed) 40 40.3 14 gauge .0747 in; carbon steel HRPO 32.59 1/16 in 3.17 on 4.76 McNichols item 14183116 1/8 in 3/16 in 60° staggered (as printed) 40 40.3 16 gauge .0635 in; pre-galvanized steel 32.59 1/16 in 3.17 on 4.76 McNichols item 17183150 1/8 in 3/16 in 60° staggered (as printed) 40 40.3 16 gauge .0500 in; aluminum 3003-H14 32.59 1/16 in 3.17 on 4.76 McNichols item 1P183116 1/8 in 3/16 in 60° staggered (as printed) 40 40.3 16 gauge .0598 in; polypropylene 32.59 1/16 in 3.17 on 4.76 McNichols item 16311414 3/16 in 1/4 in 60° staggered (as printed) 51 51.0 14 gauge .0747 in; carbon steel HRPO 18.47 1/16 in 4.76 on 6.35 McNichols item 1P315111 3/16 in 5/16 in 60° staggered (as printed) 33 32.6 11 gauge .1196 in; polypropylene 11.95 1/8 in 4.76 on 7.94 McNichols item 15143811 1/4 in 3/8 in 60° staggered (as printed) 40 40.3 11 gauge .1250 in; stainless 316L 8.15 1/8 in 6.35 on 9.52 McNichols item 16143831 1/4 in 3/8 in 60° staggered (as printed) 40 40.3 3/16 in plate .1875 in; carbon steel HRPO 8.15 1/8 in 6.35 on 9.52 McNichols item 18126131 1/2 in 11/16 in 60° staggered (as printed) 48 48.0 3/16 in plate .1875 in; stainless 304 2.44 3/16 in 12.70 on 17.46 Hendrick Manufacturing .109 in .219 in not stated on the page 22 22.5 not stated — — 2.77 on 5.56 Hendrick Manufacturing .109 in .271 in not stated on the page 15 14.7 not stated — — 2.77 on 6.88 Hendrick Manufacturing .117 in .156 in not stated on the page 51 51.0 not stated — — 2.97 on 3.96 Hendrick Manufacturing .117 in .271 in not stated on the page 17 16.9 not stated — — 2.97 on 6.88 Hendrick Manufacturing .125 in .188 in not stated on the page 40 40.1 not stated — — 3.17 on 4.78 Hendrick Manufacturing .125 in .219 in not stated on the page 30 29.5 not stated — — 3.17 on 5.56 Hendrick Manufacturing .125 in .250 in not stated on the page 23 22.7 not stated — — 3.17 on 6.35 Hendrick Manufacturing .125 in .325 in not stated on the page 13 13.4 not stated — — 3.17 on 8.25 Hendrick Manufacturing .125 in .375 in not stated on the page 10 10.1 not stated — — 3.17 on 9.52 Hendrick Manufacturing .125 in .379 in not stated on the page 10 9.9 not stated — — 3.17 on 9.63 Hendrick Manufacturing .125 in .433 in not stated on the page 8 7.6 not stated — — 3.17 on 11.00 EDCON Steel stock mild steel R01623 1.60 mm 3.20 mm not stated on the list 23 22.7 not aligned in the text read — — 0.0630 on 0.1260 in EDCON Steel stock mild steel R01636 1.60 mm 2.54 mm not stated on the list 36 36.0 not aligned in the text read — — 0.0630 on 0.1000 in EDCON Steel stock mild steel R01637 1.60 mm 2.50 mm not stated on the list 37 37.1 not aligned in the text read — — 0.0630 on 0.0984 in EDCON Steel stock mild steel R02040 2.00 mm 3.00 mm not stated on the list 40 40.3 not aligned in the text read — — 0.0787 on 0.1181 in EDCON Steel stock mild steel R02440 2.41 mm 3.66 mm not stated on the list 40 39.3 not aligned in the text read — — 0.0949 on 0.1441 in EDCON Steel stock mild steel R03230 3.25 mm 5.59 mm not stated on the list 30 30.7 not aligned in the text read — — 0.1280 on 0.2201 in EDCON Steel stock mild steel R03240 3.25 mm 4.78 mm not stated on the list 40 41.9 not aligned in the text read — — 0.1280 on 0.1882 in EDCON Steel stock mild steel R03325 3.25 mm 6.10 mm not stated on the list 25 25.7 not aligned in the text read — — 0.1280 on 0.2402 in EDCON Steel stock mild steel R03341 3.25 mm 4.78 mm not stated on the list 41 41.9 not aligned in the text read — — 0.1280 on 0.1882 in EDCON Steel stock mild steel R03346 3.25 mm 4.52 mm not stated on the list 46 46.9 not aligned in the text read — — 0.1280 on 0.1780 in EDCON Steel stock mild steel R04833 4.76 mm 7.92 mm not stated on the list 33 32.8 not aligned in the text read — — 0.1874 on 0.3118 in EDCON Steel stock mild steel R04851 4.76 mm 6.35 mm not stated on the list 51 51.0 not aligned in the text read — — 0.1874 on 0.2500 in EDCON Steel stock mild steel R06440 6.35 mm 9.53 mm not stated on the list 40 40.3 not aligned in the text read — — 0.2500 on 0.3752 in EDCON Steel stock mild steel R06446 6.35 mm 8.89 mm not stated on the list 46 46.3 not aligned in the text read — — 0.2500 on 0.3500 in EDCON Steel stock mild steel R06451 6.35 mm 8.50 mm not stated on the list 51 50.6 not aligned in the text read — — 0.2500 on 0.3346 in EDCON Steel stock mild steel R07962 7.94 mm 9.55 mm not stated on the list 62 62.7 not aligned in the text read — — 0.3126 on 0.3760 in EDCON Steel stock mild steel R08047 8.00 mm 11.11 mm not stated on the list 47 47.0 not aligned in the text read — — 0.3150 on 0.4374 in EDCON Steel stock mild steel R09523 9.53 mm 19.05 mm not stated on the list 23 22.7 not aligned in the text read — — 0.3752 on 0.7500 in EDCON Steel stock mild steel R09540 9.50 mm 14.30 mm not stated on the list 40 40.0 not aligned in the text read — — 0.3740 on 0.5630 in EDCON Steel stock mild steel R09551 9.50 mm 12.70 mm not stated on the list 51 50.7 not aligned in the text read — — 0.3740 on 0.5000 in EDCON Steel stock mild steel R12740 12.70 mm 19.05 mm not stated on the list 40 40.3 not aligned in the text read — — 0.5000 on 0.7500 in EDCON Steel stock mild steel R12748 12.70 mm 17.46 mm not stated on the list 48 48.0 not aligned in the text read — — 0.5000 on 0.6874 in EDCON Steel stock mild steel R12749 12.70 mm 17.27 mm not stated on the list 49 49.0 not aligned in the text read — — 0.5000 on 0.6799 in EDCON Steel stock mild steel R19151 19.05 mm 25.40 mm not stated on the list 51 51.0 not aligned in the text read — — 0.7500 on 1.0000 in EDCON Steel stock mild steel R25448 25.40 mm 35.00 mm not stated on the list 48 47.8 not aligned in the text read — — 1.0000 on 1.3780 in Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - McNichols: Round-hole perforated plate, item 16143831 (1/4 on 3/8, 3/16 in plate): specs table with hole diameter, centers, stagger, open area, HPSI, bar width; spec sheet and CAD drawing PDFs — PDF, DWG — Maker site terms (drawings per item; DWG may need a login) [verify license at link] — https://www.mcnichols.com/perforated-metal/round-hole/carbon-steel-cs-16143831 - McNichols: Round-hole perforated sheet, carbon steel, 20 gauge (item 16111820): 1/16 hole on 1/8 centers, 23% open — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/carbon-steel-cs-16111820 - McNichols: Round-hole perforated sheet, carbon steel, 14 gauge (item 16183114): 1/8 hole on 3/16 centers, 40% open — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/carbon-steel-cs-16183114 - McNichols: Round-hole perforated sheet, carbon steel, 14 gauge (item 16311414): 3/16 hole on 1/4 centers, 51% open — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/carbon-steel-cs-16311414 - McNichols: PLASTIPERF polypropylene, 11 gauge (item 1P315111): 3/16 hole on 5/16 centers, 33% open — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/plastic-pl-1p315111 - McNichols: Round-hole perforated plate, Type 304 stainless, 3/16 in (item 18126131): 1/2 hole on 11/16 centers, 48% open — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/stainless-steel-ss-18126131 - McNichols: Round-hole perforated sheet, further items: galvanized 16 ga (14183116), aluminum 16 ga (17183150), polypropylene 16 ga (1P183116), 316L stainless 11 ga (15143811), all 60 deg staggered — web — Maker page; numbers only — https://www.mcnichols.com/perforated-metal/round-hole/galvanized-steel-gv-14183116 - McNichols: Perforated metal getting started: round hole, straight, 60 deg staggered and 45 deg staggered centres; plate is 3/16 in or thicker, sheet 11 gauge and lighter — web — Maker page; definitions only — https://www.mcnichols.com/resources/perforated-metal/getting-started - Hendrick Manufacturing: Perforated metal patterns (page 2): round-hole patterns with diameter, centers and open area — web — Maker page; numbers only — https://www.hendrickcorp.com/perforated/resources/perf-patterns/?page=2 - EDCON Steel (Australia): Locker stock perforated sheet list 2011 update: round-hole patterns R01623 to R25448 with diameter, centres (mm), open area % — web — Distributor list; numbers only — https://www.edconsteel.com.au/store/storage/pdf/LOCKER.STOCK.PERF.2011update.pdf - Accurate Perforating: Calculate the percentage of open area: calculators for round holes on 60 deg staggered, 45 deg staggered and straight centres (formulas are in images) — web — Maker page; definitions only — https://accurateperforating.com/resources/patterns/open-percent-formulas Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/perforated-metal-round-hole-standard-patterns/index.json API: https://xemstudio.com/api/geometry?object=perforated-metal-round-hole-standard-patterns