DIN 267-4

DIN 267 Part 4:1987

Technical Delivery Conditions

Property Classes for Nuts (Previous Classes)

This standard is current and unlikely to be withdrawn. It was converted to the international property classes in 1967. The previous symbols, 4D, 5D, 5S, 6G, 6S and 8G were replaced by code numbers 4, 5, 6, 8, 10, 12 and 14 where the numbers indicated 1/100th of the minimum tensile strength.

The proof loads values specified here are lower in comparison to ISO 898-2.

DIN 267 Part 4 classes which comply with ISO 898-2 are marked with two vertical bars, for example | 8 | instead of 8.

Property classes for nuts without defined proof load values (hardness classes) have been taken from DIN 267 Part 4 and have been specified in DIN 267 Part 24.

Field of Application

Nuts specified to this standard must withstand specified proof loads and:

  • internal diameters of D ≤ M39,
  • ISO Metric threads compliant to DIN 13 Part 13,
  • thread tolerances 6G and 4H to 7H compliant to DIN 13 Part 15,
  • with minimum height m ≥ 0.8D
  • across flats or external diameters of ≥ 1.45D

This does not apply to nuts which

  • are assigned to property classes in accordance with ISO 898-2
  • have locking ability (DIN 267 Part 15)
  • are weldable
  • have corrosion resistance (DIN 267 Part 11)
  • used in temperatures above 300°C or below -50°C (DIN 267 Part 13)

Nuts made from free-cutting steel shall not be used above 250°C.

Mechanical Properties Table

These properties apply for testing at standard room temperature and pressure.

 

Property Class
Mechanical Properties 4 5 6 8 10 12
Proof Load Stress Sp (N/mm2) 400 500 600 800 1000 1200
Vickers Hardness HV5 (max) 302 302 302 302 353 353
Brinell Hardness HB30 (max) 290 290 290 290 335 335
Rockwell Hardness HRC (max) 30 30 30 30 36 36

Chemical Composition Table

 

Chemical Composition

% by mass
Property Class

C

max

Mn

min

P

max

S

max
4, 5 and 6 0.50 - 0.110 0.150
8 0.58 0.30 0.060 0.150
10 0.58 0.30 0.048 0.058
12 0.58 0.45 0.048 0.058

 

Specifications and Allowed Sizes as Specified to DIN 267-4:1987

C= Coarse Pitch
F= Fine Pitch
Fastener Ranges are given for each grade of fastener as specified within DIN 267-4 specification.

STANDARD DESCRIPTION PITCH RANGE 4 5 6 8 10 12
DIN 555:1987 Hexagon Nuts - Grade C C M5-M100 M16-M39 M5-M39
DIN 934:1987 Hex Full Nuts C, F M1-M160 M1-M39 M3-M39 M3-M39
DIN 980:1987 All Metal Prevailing Torque Nuts (Type M or V) C M3-M39 M3-M39 M3-M39 M3-M39 M3-M16
DIN 980:1987 All Metal Prevailing Torque Nuts (Type M or V) F M8-M39 M8-M39 M8-M39 M8-M39 M8-M16
DIN 985:1987 Nylon Insert Nuts C M3-M48 M3-M39 M3-M39 M3-M39
DIN 985:1987 Nylon Insert Nuts F M8-M48 M8-M39 M8-M39 M8-M39 M8-M39
DIN 1804:1971 Slotted Round Nuts F M6-M200 M6-M200
DIN 1816:1971 Round Nuts with Pin Holes F M6-M200 M6-M200
DIN 74361A:1979 Type A Spherical Collar Nuts F M12-M22 M12-M22 M12-M22
DIN 74361B:1979 Type B Flat Collar Nuts F M12-M22 M12-M22 M12-M22