ISO 2768-1 defines general tolerances for linear and angular dimensions without individual tolerance indications on engineering drawings, in four classes: fine (f), medium (m), coarse (c) and very coarse (v). Machine shops, fabricators, forging and casting units and precision component makers supplying automotive, engineering and export OEMs are asked to declare and prove that their drawings, processes and inspection conform to the stated ISO 2768 class. We audit your drawing control, process capability and inspection records against the standard and arrange a conformity certificate from a certification body, usually alongside ISO 9001.
Legal basis: ISO 2768-1:1989 (general tolerances for linear and angular dimensions) and ISO 2768-2 (geometrical tolerances), adopted in India as IS 2102 (Part 1); applied through OEM purchase specifications and customer drawings
Who needs it
- CNC machine shops, job-workers and precision component manufacturers supplying automotive and engineering OEMs
- Sheet-metal fabricators, forging and casting units asked to declare a tolerance class on drawings
- Exporters of machined parts to Europe and other markets where ISO 2768 is the default drawing convention
- Tier-2 and Tier-3 suppliers undergoing OEM process audits or PPAP submissions
- Companies standardising drawing practice across design, production and inspection
Common in:Manufacturing & Industrial Units
Documents required
- 1Sample engineering drawings and the title-block tolerance convention currently used
- 2Drawing control and engineering change procedure
- 3List of machines with capability studies or recent calibration of measuring instruments
- 4Inspection plans, first-article and in-process inspection records
- 5Measuring instrument calibration certificates traceable to NABL-accredited labs
- 6Customer specifications or purchase orders referencing ISO 2768 classes
- 7Non-conformance and rejection data for the last six months
- 8Existing ISO 9001 or IATF 16949 certificate, if held
Missing something? We help you obtain or regularise supporting documents before filing.
How we get it done
- 1
Scoping and drawing review
Day 1–5We review your drawings, title blocks and customer requirements to establish which tolerance classes you declare and where.
- 2
Process capability and measurement assessment
Day 3–12Machine capability, measurement uncertainty and calibration are assessed to confirm the classes your processes can reliably hold.
- 3
Drawing and inspection standardisation
Day 10–20Title-block conventions, drawing control, inspection plans and sampling are standardised to the declared ISO 2768 classes.
- 4
Internal verification
Day 18–25Sample parts are measured against the declared classes and records are checked so that the audit has evidence to see.
- 5
Conformity audit and certificate
Day 22–30The certification body audits drawing practice, capability and inspection evidence and issues the ISO 2768-1 conformity certificate.
If you skip certification
No statutory penalty applies, but the commercial consequences are direct: parts rejected at the customer's incoming inspection, PPAP or vendor audits failed on drawing and inspection control, chargebacks for non-conforming batches and loss of OEM and export business to suppliers who can demonstrate conformity.
Why MYDA Group
Specialists, not generalists
Environmental compliance is our only practice, so your file is handled by people who do this every day.
Fixed fee, written scope
You know the professional fee and the statutory fees before we start. No surprise add-ons.
Inspection and audit-ready
We prepare your site and team for the board visit or certification audit and attend it with you.
Lifetime reminders
Every condition, return and renewal goes into your compliance calendar with alerts.
Frequently asked questions
Is there really an ISO 2768 certificate?
ISO 2768-1 is a technical standard, so there is no accredited management-system certification for it in the way there is for ISO 9001. What buyers accept is a conformity certificate or audit report from a certification body or laboratory confirming that your drawing practice, process capability and inspection demonstrate the declared tolerance class. We make sure the certificate you get is defensible in an OEM audit.
Which tolerance class should we declare?
The class is chosen per drawing based on what the process can reliably hold: m (medium) is the most common for general machining, f (fine) for precision work and c or v for fabrication and castings. Declaring a class you cannot hold is the fastest route to rejections, so the capability study comes first.
Does ISO 2768-2 also need to be covered?
ISO 2768-2 covers geometrical tolerances (straightness, flatness, perpendicularity, symmetry, run-out) in classes H, K and L. Customers often specify both, for example ISO 2768-mK, and we cover both parts in the same audit.