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EN 338:2016

Structural timber — Strength classes

Characteristic strength, stiffness and density for softwood classes C14–C50 (and T classes from tension tests) and hardwood classes D18–D80. Grading rules assign a species and grade to a class (EN 1912).

Supersedes EN 338:2009; check which edition a table quotes. Source: ÚNMS SR (Slovak standards office)

312 values on this site name a clause of this document.

Grades on Matipedia

EuropeEN 338:2016

C14

Softwood strength class: bending 14 MPa, E0,mean 7 000 MPa, ρk 290 kg/m³.

fm,k
14 MPa
E
7 000 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C16

Softwood strength class: bending 16 MPa, E0,mean 8 000 MPa, ρk 310 kg/m³.

fm,k
16 MPa
E
8 000 MPa
Confirmed
5
Corroborated
7
Single source
16
EuropeEN 338:2016

C18

Softwood strength class: bending 18 MPa, E0,mean 9 000 MPa, ρk 320 kg/m³.

fm,k
18 MPa
E
9 000 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C20

Softwood strength class: bending 20 MPa, E0,mean 9 500 MPa, ρk 330 kg/m³.

fm,k
20 MPa
E
9 500 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C22

Softwood strength class: bending 22 MPa, E0,mean 10 000 MPa, ρk 340 kg/m³.

fm,k
22 MPa
E
10 000 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C24

Softwood strength class: bending 24 MPa, E0,mean 11 000 MPa, ρk 350 kg/m³.

fm,k
24 MPa
E
11 000 MPa
Confirmed
5
Corroborated
7
Single source
16
EuropeEN 338:2016

C27

Softwood strength class: bending 27 MPa, E0,mean 11 500 MPa, ρk 360 kg/m³.

fm,k
27 MPa
E
11 500 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C30

Softwood strength class: bending 30 MPa, E0,mean 12 000 MPa, ρk 380 kg/m³.

fm,k
30 MPa
E
12 000 MPa
Confirmed
5
Corroborated
7
Single source
16
EuropeEN 338:2016

C35

Softwood strength class: bending 35 MPa, E0,mean 13 000 MPa, ρk 390 kg/m³.

fm,k
35 MPa
E
13 000 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C40

Softwood strength class: bending 40 MPa, E0,mean 14 000 MPa, ρk 400 kg/m³.

fm,k
40 MPa
E
14 000 MPa
Corroborated
12
Single source
16
EuropeEN 338:2016

C45

Softwood strength class: bending 45 MPa, E0,mean 15 000 MPa, ρk 410 kg/m³.

fm,k
45 MPa
E
15 000 MPa
Single source
28
EuropeEN 338:2016

C50

Softwood strength class: bending 50 MPa, E0,mean 16 000 MPa, ρk 430 kg/m³.

fm,k
50 MPa
E
16 000 MPa
Single source
28
EuropeEN 338:2016

D18

Hardwood strength class: bending 18 MPa, E0,mean 9 500 MPa, ρk 475 kg/m³.

fm,k
18 MPa
E
9 500 MPa
Single source
28
EuropeEN 338:2016

D24

Hardwood strength class: bending 24 MPa, E0,mean 10 000 MPa, ρk 485 kg/m³.

fm,k
24 MPa
E
10 000 MPa
Single source
28
EuropeEN 338:2016

D27

Hardwood strength class: bending 27 MPa, E0,mean 10 500 MPa, ρk 510 kg/m³.

fm,k
27 MPa
E
10 500 MPa
Single source
28
EuropeEN 338:2016

D30

Hardwood strength class: bending 30 MPa, E0,mean 11 000 MPa, ρk 530 kg/m³.

fm,k
30 MPa
E
11 000 MPa
Corroborated
5
Single source
23
EuropeEN 338:2016

D35

Hardwood strength class: bending 35 MPa, E0,mean 12 000 MPa, ρk 540 kg/m³.

fm,k
35 MPa
E
12 000 MPa
Single source
28
EuropeEN 338:2016

D40

Hardwood strength class: bending 40 MPa, E0,mean 13 000 MPa, ρk 550 kg/m³.

fm,k
40 MPa
E
13 000 MPa
Single source
28
EuropeEN 338:2016

D45

Hardwood strength class: bending 45 MPa, E0,mean 13 500 MPa, ρk 580 kg/m³.

fm,k
45 MPa
E
13 500 MPa
Single source
28
EuropeEN 338:2016

D50

Hardwood strength class: bending 50 MPa, E0,mean 14 000 MPa, ρk 620 kg/m³.

fm,k
50 MPa
E
14 000 MPa
Single source
28
EuropeEN 338:2016

D55

Hardwood strength class: bending 55 MPa, E0,mean 15 500 MPa, ρk 660 kg/m³.

fm,k
55 MPa
E
15 500 MPa
Single source
28
EuropeEN 338:2016

D60

Hardwood strength class: bending 60 MPa, E0,mean 17 000 MPa, ρk 700 kg/m³.

fm,k
60 MPa
E
17 000 MPa
Single source
28
EuropeEN 338:2016

D65

Hardwood strength class: bending 65 MPa, E0,mean 18 500 MPa, ρk 750 kg/m³.

fm,k
65 MPa
E
18 500 MPa
Single source
28
EuropeEN 338:2016

D70

Hardwood strength class: bending 70 MPa, E0,mean 20 000 MPa, ρk 800 kg/m³.

fm,k
70 MPa
E
20 000 MPa
Single source
28
EuropeEN 338:2016

D75

Hardwood strength class: bending 75 MPa, E0,mean 22 000 MPa, ρk 850 kg/m³.

fm,k
75 MPa
E
22 000 MPa
Single source
28
EuropeEN 338:2016

D80

Hardwood strength class: bending 80 MPa, E0,mean 24 000 MPa, ρk 900 kg/m³.

fm,k
80 MPa
E
24 000 MPa
Single source
28