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Engineering resources

Engineering tools for better machining decisions.

Check tolerances, sizes, weights and process parameters against published reference data — every table states its standard, its edition and the limits that still apply to your drawing.

Search the tools

11Tools available

17Reference tables

75Answers published

Tool directory

All engineering tools

Choose the task you need to solve. Each tool shows its own source, its scope and the reference data behind it.

11 tools

Lookup tables Tolerances, fits, finishes, threads and colours

General tolerances

ISO 2768 general tolerances by nominal size and class — choose the right tolerance class before you write a size tolerance on the drawing.

Limits and fits

ISO 286-2 hole and shaft fit classes, IT tolerance grades and fundamental deviations in micrometres.

Surface roughness

ISO 21920 surface texture grades with Ra and Rz values, the process that reaches them and what the number actually controls.

Thread reference

ISO metric thread sizes, coarse and fine pitches, tap drill diameters and the tolerance class to write on a drawing.

RAL colour reference

RAL colour families for machined parts — how each one behaves on anodised aluminium and powder coating, and where the official swatch comes from.

Hardness conversion

Convert between hardness scales for the same material, and pick the scale each material is actually tested on.

Calculators Feeds, speeds, bending, units and weight

Cutting parameters

Calculate spindle speed and feed rate from cutting speed, tool diameter and tooth count, with typical starting ranges per material.

Sheet metal bend allowance

Bend allowance, flat length and bend deduction for folded sheet, using the K-factor of your material.

Engineering unit converter

Convert metric and imperial length, mass and force values with exact, traceable conversion factors.

Material weight calculator

Estimate the stock weight of a part from material density, stock shape and dimensions — plate, round bar or tube.

Reference guides Hardness conversion and geometric tolerancing

GD&T symbol guide

Read a geometric tolerancing callout: each characteristic, its tolerance zone, the datums it needs and the modifiers that change it.

Reference only. These tools help you ask better questions and check a drawing early. The purchase specification, the approved drawing and the applicable standard always remain the controlling requirements for production.

How to use them

Three steps to a cleaner enquiry

01 · FIND

Start from the question you have

Search by the symbol or the number on your drawing — for example H7, Ra 1.6, M10 x 1.5 or a sheet thickness. The tool name is rarely what a drawing uses.

02 · CHECK

Read the source and the limits

Every table names its standard and edition. Read the scope note before you copy a value into a specification, because the class that fits a housing rarely fits a sealing face.

03 · CONFIRM

Confirm the critical features

Put the critical dimensions and fits in a separate note on the drawing, and let our engineering team review manufacturability before the parts are released.

Have a drawing that needs a second pair of eyes?

Send the file and the requirements. Our engineers review tolerancing, material and process fit, then come back with manufacturability feedback and a quote.

Upload a drawing for a quote

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