Fastener Guide / Technical Reference

Metric Property Class 8.8

Class 8.8 is quenched-and-tempered carbon steel and the default metric class on machinery and vehicles. The 8 means about 800 MPa tensile; the .8 means yield is 80% of tensile.

Last reviewed 2026-09-10 · Governing standard: ISO 898-1:2013; ISO 898-2:2022 · reference FG-1AED9D · Report an error on this sheet

Marking8.8 plus manufacturer ID
Matching nutISO 898-2 class 8

Mechanical properties (ISO 898-1)

SizeTensile Rm (min)Yield Rp0.2 (min)Proof stressHardness
up to M16800 MPa640 MPa580 MPa250 - 320 HV
over M16830 MPa660 MPa600 MPa255 - 335 HV

These tables carry the same figures as the printed sheet below.

The printed sheet

Metric Property Class 8.8

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Text version of this sheet

ISO 898-1 · property class 8.8 · the metric workhorse

FIELD IDENTIFICATION

What it is

Class 8.8 is quenched-and-tempered carbon steel and the default metric class on machinery and

vehicles. The 8 means about 800 MPa tensile; the .8 means yield is 80% of tensile.

MFG

8.8

Marking

8.8 plus manufacturer ID

Matching nut

ISO 898-2 class 8

Head stamped 8.8 + manufacturer ID

Mechanical properties (ISO 898-1)

Size

Tensile Rm (min)

Yield Rp0.2 (min)

Proof stress

Hardness

up to M16

800 MPa

640 MPa

580 MPa

250 - 320 HV

over M16

830 MPa

660 MPa

600 MPa

255 - 335 HV

Key points

Close to SAE Grade 5 in strength, but a different standard, thread and dimension series. Not interchangeable.

Governing standards: ISO 898-1:2013; ISO 898-2:2022. Editions shown are the latest confirmed as of September 2026. The drawing and the governing standard always take

precedence over this sheet.

torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability

arising from reliance on this reference.

Fastener Guide reference FG-1AED9D · thefastenerapp.com/fastener-guide/technical-reference/metric-property-class-8-8 · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

Related sheets

← Metric Property Class 4.8Metric Property Class 9.8 →

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Share of dollars

Fasteners37%$69,879
Electrical10%$19,152
Fleet and Automotive7%$12,293
Hardware and Building Supplies5%$10,243
Tools and Equipment5%$9,811
Cutting Tools and Metalworking5%$9,740
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Hardware and Building Supplies4%33
All other20%162

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Abrasives3%17,251
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Share of the rep’s business

Summit Precast LLC20.2%
Brunswick Galvanizing Inc.14.6%
Talleyrand Signs LLC8.0%
Mayport Tool & Die Inc.7.8%
Eagle Mechanical LLC7.2%
Premier Electric Group5.9%
Tallahassee Packaging LLC3.7%
Coastal Maintenance Group3.3%
All others (64 customers)29.4%

Time each customer deserves

CustomerHours a monthHours a week
Summit Precast LLC35.08.1
Brunswick Galvanizing Inc.25.35.8
Talleyrand Signs LLC13.93.2
Mayport Tool & Die Inc.13.53.1
Eagle Mechanical LLC12.52.9
Premier Electric Group10.22.4
Tallahassee Packaging LLC6.41.5
Coastal Maintenance Group5.71.3
All others (64 customers)51.011.8

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