Resources

The bench tools, on the bench.

Six calculators and two reference tables for the numbers you reach for before a design is worth modelling. Everything runs in your browser — nothing is sent to us.

CAD Tool

Open a solid model in your browser.

CAD Viewer

Load a STEP, IGES, STL, OBJ, PLY, 3MF or DXF file directly in your browser. Orbit, section, measure distances, and export to another format. Nothing is uploaded — the file never leaves your device.

.step .iges .stl .obj .dxf

Open CAD Viewer

Calculators

Quick answers for early decisions.

Metric Imperial

Material weight

Rectangular bar, plate, or blank. Pick the alloy and enter the envelope.

Material

Length (mm)

Width (mm)

Thickness (mm)

Enter the three dimensions.

Volume × density. Ignores radii, holes, and machining allowance.

Unit conversion

The conversions that come up most often reading a shop drawing.

Value

Conversion

Enter a value.

Exact factors: 25.4 mm/in, 0.45359237 kg/lb, 6894.757 Pa/psi.

Bolt torque

Target tightening torque from bolt size, preload, and thread condition.

Nominal diameter (mm)

Target preload (kN)

Condition (K factor)

Enter diameter and preload.

T = K · D · F. The K factor is empirical and scatters widely — treat the result as a starting point, not a specification.

Sheet metal bend allowance

Arc length through the bend, for laying out a flat pattern.

Bend angle (degrees)

Inside radius (mm)

Material thickness (mm)

K factor

Enter angle, radius, and thickness.

BA = (π/180) · A · (R + K·T). Always confirm the K factor against your fabricator’s own test bends.

Thin-wall hoop stress

Circumferential stress in a cylinder under internal pressure.

Internal pressure (MPa)

Inside diameter (mm)

Wall thickness (mm)

Enter pressure, diameter, and wall.

σ = P·D / 2t, valid only where D/t > 20. Not a code calculation — pressure equipment must be designed to ASME VIII or the governing code.

Beam deflection

Mid-span deflection of a simply supported rectangular beam under a centre point load.

Point load (N)

Span (mm)

Section width b (mm)

Section height h (mm)

Material

Enter load, span, and section.

δ = FL³/48EI, I = bh³/12. Elastic only, self-weight excluded, solid rectangle.

Reference

Numbers worth not looking up twice.

Material densities
Material	kg/m³	lb/in³
Mild steel	7850	0.284
Stainless 304	8000	0.289
Cast iron	7200	0.260
Aluminium 6061	2700	0.098
Brass	8500	0.307
Copper	8960	0.324
Titanium Gr. 5	4430	0.160
UHMW polyethylene	940	0.034

Metric coarse tap & clearance drills
Thread	Pitch	Tap drill	Clearance
M3	0.50	2.50	3.4
M4	0.70	3.30	4.5
M5	0.80	4.20	5.5
M6	1.00	5.00	6.6
M8	1.25	6.80	9.0
M10	1.50	8.50	11.0
M12	1.75	10.20	13.5
M16	2.00	14.00	17.5
M20	2.50	17.50	22.0

Use these as planning estimates, not design verification. Every calculator here uses a simplified textbook model, with its assumptions stated underneath it. They are good for sizing a first idea, sanity-checking a supplier quote, or deciding whether something is worth modelling properly. They are not a substitute for code calculations, finite element analysis, or review by the engineer of record on your project. If a number here is going to be relied on, send us the case and we will check it properly.

Project intake checklist

What to send for a faster quote.

Photos

Overall views, closeups, interfaces, labels, and failure points.

Measurements

Critical dimensions, bolt patterns, clearances, and known tolerances.

Existing files

PDFs, DWG, STEP, STL, sketches, manuals, and old drawings.

Deadline

Tell us what decision or fabrication date the design must support.

Have enough information to start?

You do not need a perfect package. Send what exists and we will help organise the next step.

Start a Project