DIN 267 PART 11 FULL

The “70” denotes the minimum tensile strength to be met by the material (actually the bolt, screw or nut after manufacture).

DIN 267 PART 11 FULL

The designation A4-80 derives from “A” meaning the material is a cold worked austenitic stainless, divided into 5 grades (1-5) according to material characteristics (see Annex B of DIN ES ISO 3506-1: 1997 for full description of each grade). Material to meet the properties of A2-70 is one element of our product range. Midland Bright Steels supplies a range of material that enable fastener manufacturers and others to produce products that meet or exceed the properties required in the above standard. For this reason, it has been deemed necessary to specify higher test stresses.DIN ES ISO 3506-1: 1997 specifies the mechanical properties of bolts, screws and nuts made of austenitic (amongst others) stainless steels, when tested over an ambient temperature range of 15✬ to 25✬.

As these bars obtain their strength through strainhardening (drawing), with the result that their mechanical properties are not uniform over their cross section, there is a risk that the nuts manufactured from such bars will achieve the low test stress in the proof load test to DIN EN ISO 3506-2 using a hardened mandrel, but that they will fail before the minimum failure load is reached when they are combined with a softer bolt. While nuts of property classes 70 and 80 to DIN EN ISO 3506-2 with small diameters produced in large batches are usually cold-formed and property class 50 is only supplied hot-formed for larger diameters, special nuts to DIN 267-13 are required to be machined from steel bars when produced in small batches.

b The test stresses given here are higher than those specified in DIN EN ISO 3506-2 in order to identify fully loadable nuts in the proof load test.

As a result, the test stress is always higher than the highest minimum tensile strength of the bolt recommended for use in the combination

a The test stress specified takes into account the fact that the hardness of the test mandrel used in the proof load test is greater than the hardness of the bolts with which the nuts are combined.

Mechanical Requirments Suitable combinations of bolt and nut

g See also VdTÜV-Werkstoffblatt WB 490.

f Symbol VH denotes grade X22CrMoV12-1 as in DIN EN 10269 with a 0,2 % proof strength Rp 0,2 ≥ 700 N/mm2 (+ QT 2).

e Symbol V denotes grade X22CrMoV12-1 as in DIN EN 10269 with a 0,2 % proof strength Rp 0,2 ≥ 600 N/mm2 (+QT 1).

c Heat treatment condition as defined in DIN EN 10269:2006-07, :.

b Maximum temperatures with specified creep strengths and creep rupture strengths.

a Maximum temperatures with specified proof strengths and tensile strengths.

Steels and nickel alloys as in DIN EN 10269 for high and low service temperatures Temperature ranges

a Copper content ≤ 1 % (reduced content compared to that specified in DIN EN ISO 3506-1 and -2).

When used at lower temperatures, the fasteners should be subjected to a suitability test for the intended application.

NOTE No impairments of fastener reliability when used at higher service temperatures are known.

Related Specifications of DIN 267 Bolting EN 10269 BS EN 1515 EN 10088-3 ISO 898-1 ISO 898-5 DIN 267 Chemical Composition Austenitic steels as in DIN EN ISO 3506-1 and DIN EN ISO 3506-2 for low service temperatures Minimum

Din 267 Part 11