Six free, instant tools for design engineers and buyers — bar weight, thread specs and tap drills across Metric/UNC/BSP/NPT, ISO 286 limits & fits, insert torque and alloy density. Built by a brass manufacturer, not a generic calculator site.
Estimate the weight of round, hex or square bar stock by alloy — brass, copper or aluminium. Useful for costing raw material, freight and per-piece yield.
Densities are nominal; actual mass varies with exact composition and tolerance. Round: π·(d/2)²·L. Hex: (√3/2)·AF²·L. Square: side²·L.
Reference: alloy densities per EN 12164 / EN 12165 nominal values. See materials & alloys library.
Live thread dimensions across four systems — ISO metric coarse, UNC inch, BSP parallel (G, ISO 228) and NPT taper. Pick a series and size; the table below follows your selection.
| Thread | Pitch / TPI | Major Ø | Pitch Ø | Minor Ø (ext) | Tap drill | Clearance |
|---|
Coarse-pitch series per ISO 261. Basic diameters per ISO 724: d₂ = d − 0.6495·P, d₃ = d − 1.2269·P (external), D₁ = d − 1.0825·P (internal). Fine-pitch threads (e.g. M8×1) use different pitches — ask us for the full fine series.
References: ISO 261 / ISO 724 / ISO 965 / ISO 273 (metric), ASME B1.1 (UNC), ISO 228-1 (BSP parallel G), ASME B1.20.1 (NPT). See also our thread standards guide.
Select a thread series and size for the recommended tap-drill (~75% engagement for metric/UNC). The table follows your selected series.
| Thread | Pitch / TPI | Tap drill (mm) | Tap drill (inch) | Clearance (close / normal) |
|---|
Metric/UNC tap-drill ≈ major Ø − pitch (≈75% engagement); use a slightly larger drill in free-machining brass to reduce tap load. BSP G drills are for parallel threads (ISO 228-1). NPT holes should be drilled then reamed with a 1:16 taper reamer before tapping for full thread form.
References: ISO 261 / ISO 724 / ISO 273 (metric), ASME B1.1 & Machinery's Handbook tapping data (UNC), ISO 228-1 (G), ASME B1.20.1 (NPT).
For turned brass rod and CNC parts. Use the ISO 286 fits table to pick shaft/hole pairs for assemblies, the IT-grade table for the actual tolerance band at a given size, and ISO 2768 for untoleranced dimensions on the drawing.
Type a nominal size and a tolerance class — e.g. 8 + H6 — or a complete fit like H7/g6 to get limit sizes and the fit character. Computed per ISO 286-1:2010 / ISO 286-2:2010 (the current editions, confirmed June 2026).
Covers Ø0–500 mm, grades IT1–IT16, deviation letters D–P / d–p incl. H, h, JS, js (uppercase = hole, lowercase = shaft). Press-fit classes r, s and beyond — ask our engineers.
| Fit | Type | Character | Typical use on turned brass parts |
|---|---|---|---|
| H7/g6 | Clearance | Close running / sliding | Spindles, guided pins, rotating shafts needing fine fit |
| H7/h6 | Clearance | Location / slide | Slip-fit locating spigots, parts assembled by hand |
| H8/f7 | Clearance | Free running | Bushings, bearings with lubrication, looser running fits |
| H11/c11 | Clearance | Loose | Wide clearance, weldments, non-critical assemblies |
| H7/k6 | Transition | Light keying | Located parts needing accuracy but occasional disassembly |
| H7/n6 | Transition | Tight | Press-located parts, light-duty drive without slip |
| H7/p6 | Interference | Press / drive | Inserts, bushes & pins retained by interference |
| H7/s6 | Interference | Heavy drive | Permanent press fits, shrink/force assembly |
Tolerance band width for a given nominal size. A hole H7 = 0 to +IT7; a shaft h6 = 0 to −IT6. Apply the fundamental deviation for other letters.
| Nominal size (mm) | IT6 | IT7 | IT8 | IT9 | IT11 |
|---|---|---|---|---|---|
| over 3 to 6 | 8 | 12 | 18 | 30 | 75 |
| over 6 to 10 | 9 | 15 | 22 | 36 | 90 |
| over 10 to 18 | 11 | 18 | 27 | 43 | 110 |
| over 18 to 30 | 13 | 21 | 33 | 52 | 130 |
| over 30 to 50 | 16 | 25 | 39 | 62 | 160 |
| over 50 to 80 | 19 | 30 | 46 | 74 | 190 |
| over 80 to 120 | 22 | 35 | 54 | 87 | 220 |
Worked example: a Ø20 mm H7 bore = 20.000 / 20.021 mm (0 to +21 µm). A Ø20 mm g6 shaft = 19.993 / 19.980 mm (−7 to −20 µm), giving a close-running clearance fit.
Applies to dimensions without an individual tolerance. We work to class medium (m) by default; tighter classes available on request.
| Nominal length (mm) | Fine (f) | Medium (m) | Coarse (c) | Very coarse (v) |
|---|---|---|---|---|
| 0.5 to 3 | ±0.05 | ±0.1 | ±0.2 | — |
| over 3 to 6 | ±0.05 | ±0.1 | ±0.3 | ±0.5 |
| over 6 to 30 | ±0.1 | ±0.2 | ±0.5 | ±1.0 |
| over 30 to 120 | ±0.15 | ±0.3 | ±0.8 | ±1.5 |
| over 120 to 400 | ±0.2 | ±0.5 | ±1.2 | ±2.5 |
| over 400 to 1000 | ±0.3 | ±0.8 | ±2.0 | ±4.0 |
Typical turned-brass capability: we routinely hold IT7–IT8 on diameters and ISO 2768-m or finer on lengths; critical features can be held to IT6 / ±0.01 mm with in-process gauging. State the fit or tolerance on your drawing and we quote to it.
References: ISO 286-1:2010 & ISO 286-2:2010 (GPS — code system for tolerances on linear sizes; current editions), ISO 1829 (selection of tolerance zones), ISO 2768-1 (general tolerances — linear & angular), ISO 2768-2 (geometrical). Values cross-checked against Machinery's Handbook. See our tolerances guide.
Typical guidance for heat-set and press-in brass inserts in thermoplastics. Values are a starting point — always confirm with pull-out and jack-out testing on your own host material.
| Thread | Typical insert OD (mm) | Boss hole Ø (mm) | Heat-set tip temp | Typical seating force |
|---|---|---|---|---|
| M2 | 3.2–3.6 | 3.0–3.2 | 200–260 °C | Light hand press |
| M2.5 | 3.6–4.0 | 3.4–3.6 | 200–260 °C | Light hand press |
| M3 | 4.0–4.6 | 3.8–4.2 | 220–280 °C | Light–medium |
| M4 | 5.6–6.0 | 5.4–5.6 | 220–280 °C | Medium |
| M5 | 6.4–7.1 | 6.2–6.5 | 240–300 °C | Medium |
| M6 | 8.0–8.5 | 7.8–8.0 | 240–300 °C | Firm |
| M8 | 9.5–10.5 | 9.3–9.6 | 260–320 °C | Firm (press) |
Boss hole sizes assume amorphous/semi-crystalline thermoplastics; glass-filled grades may need a larger hole. Heat-set tip temperature is set above the polymer melt point, not the insert. Brassland supplies inserts to DIN 16903, IUTB/IUTC/IUTD and customer-specific profiles.
References: DIN 16903 (threaded inserts for plastics) and published heat-set boss-design guidance. Always validate with pull-out / jack-out testing on your own host material. See our brass inserts range.
Nominal densities for all 19 alloys in the Brassland materials library. Each links to its full datasheet.
| Alloy (EN / UNS) | Common name | Density (g/cm³) | Typical use |
|---|---|---|---|
| CW614N / CuZn39Pb3 | Free-machining brass (machining std.) | 8.50 | Precision turned components |
| CW617N / CuZn40Pb2 | Hot-working brass | 8.47 | Forged & machined fittings |
| CW602N / CuZn36Pb2As | DZR brass | 8.52 | Potable-water fittings |
| CW607N / CuZn36Pb2As | DZR machining brass | 8.52 | Water-side components |
| CW612N / CuZn39Pb2 | Machining/forging brass | 8.50 | Forged blanks, machined parts |
| CW625N / CuZn35Pb1.5AlAs | Low-lead DZR brass | 8.50 | Drinking-water components |
| CW510L / CuZn42 | Lead-free brass | 8.37 | Low-lead turned parts |
| CuZn37 / CW508L | Deep-drawing brass | 8.44 | Cold-formed parts |
| CuZn40 / CW509L | Duplex brass | 8.39 | General engineering |
| CW724R / CuZn21Si3P | Lead-free silicon brass | 8.30 | Drinking-water, RoHS-critical |
| C36000 | Free-cutting brass (UNS) | 8.49 | High-speed turned parts |
| C37700 | Forging brass (UNS) | 8.44 | Hot-forged components |
| C35330 | DZR brass (UNS) | 8.47 | Potable-water fittings |
| C27450 | Low-lead brass (UNS) | 8.52 | Plumbing & hardware |
| C46400 | Naval brass | 8.41 | Marine & corrosive duty |
| C69300 / CuZn21Si3P | Lead-free silicon brass (UNS) | 8.30 | Lead-free programmes |
| C6802 | Silicon brass (JIS) | 8.69 | Lead-free applications |
| C11000 (ETP) | Electrolytic tough pitch copper | 8.90 | Electrical / EV terminals |
| C14500 | Tellurium copper | 8.94 | High-conductivity machined parts |
See the full materials & alloys library for chemistry, mechanical properties and standards equivalents.
References: densities per EN 12164 / EN 12165 / EN 1652 nominal values and ASTM B16 / B124. Cross-checked against supplier mill datasheets.
Last reviewed: June 2026. Calculator outputs are estimates; verify against the governing standard and your drawing for procurement-critical work.
Send a drawing or sample. We quote custom CNC and hot-forged brass parts — no MOQ surprises.
Request a Quote →