STA EN 14592

SMOOTH DOWEL

STEEL
S355 steel grade to provide higher shear strength to the standard sizes
used in structural design (Ø16 and Ø20).

GEOMETRY
Tapered end for an easy insertion of the fastener into the pre drilled tim-
ber element. Available in 1,0 m long version.

SPECIAL VERSION
Available upon request in high bond steel and geometry designed to
avoid pull-out when used in seismic areas.

CHARACTERISTICS
FOCUS concealed joints
DIAMETER from 8,0 to 20,0 mm
LENGTH from 60 to 500 mm
STEEL S235 (Ø8-Ø12) - S355 (Ø16-Ø20)

MATERIAL
Bright zinc plated carbon steel.

FIELDS OF USE
Timber-to-timber and steel to timber shear
connections
• solid timber and glulam
• CLT, LVL
• timber based panels

54 | STA | CONCEALED BEAM JOINTS

LARGE SCALE STRUCTURES
Calculation accuracy: CE marking guarantees
the usage suitability. Improved bond version
ideal in seismic areas.

TIMBER-TO-METAL
Ideal for being used with ALU brackets in real-
izing concealed joints. When used with wood
taps it meets the fire safety requirements and
provides a rewarding aesthetic appearance.

CONCEALED BEAM JOINTS | STA | 55

CODES AND DIMENSIONS

d1 CODE L steel pcs d1 CODE L steel pcs

[mm] [mm] [mm] [mm]
STA860B 60 S235 200 STA16200B 200 S355 50
STA880B 80 S235 200 STA16220B 220 S355 50
8 STA8100B 100 S235 200 STA16240B 240 S355 50
STA8120B 120 S235 200 STA16260B 260 S355 50
STA8140B 140 S235 200 STA16280B 280 S355 50
STA1260B 60 S235 100 STA16300B 300 S355 50
STA1270B 70 S235 100 16 STA16320B 320 S355 50
STA1280B 80 S235 100 STA16340B 340 S355 50
STA1290B 90 S235 100 STA16360B 360 S355 50
STA12100B 100 S235 100 STA16380B 380 S355 50
STA12110B 110 S235 100 STA16400B 400 S355 50
STA12120B 120 S235 100 STA16420B 420 S355 50
STA12130B 130 S235 100 STA16500B 500 S355 50
STA12140B 140 S235 100 16 STA161000B 1000 S355 1
STA12150B 150 S235 100 STA20120B 120 S355 25
12
STA12160B 160 S235 100 STA20140B 140 S355 25
STA12170B 170 S235 100 STA20160B 160 S355 25
STA12180B 180 S235 100 STA20180B 180 S355 25
STA12200B 200 S235 100 STA20190B 190 S355 25
STA12220B 220 S235 100 STA20200B 200 S355 25
STA12240B 240 S235 100 20 STA20220B 220 S355 25
STA12260B 260 S235 100 STA20240B 240 S355 25
STA12280B 280 S235 100 STA20260B 260 S355 25
STA12320B 320 S235 100 STA20300B 300 S355 25
STA12340B 340 S235 100 STA20320B 320 S355 25
12 STA121000B 1000 S235 1 STA20360B 360 S355 25
STA1680B 80 S355 50 STA20400B 400 S355 25
STA16100B 100 S355 50 20 STA201000B 1000 S355 25
STA16110B 110 S355 50
STA16120B 120 S355 50
STA16130B 130 S355 50
16 STA16140B 140 S355 50
STA16150B 150 S355 50
STA16160B 160 S355 50
STA16170B 170 S355 50
STA16180B 180 S355 50
STA16190B 190 S355 50

Available upon request:high bond steel and shaped to avoid d1

pull-out when used in seismic areas (e.g. STAS16200). Minimum
quantity 1000 pieces. L

MATERIAL AND DURABILITY EXTERNAL LOADS

STA Ø8-Ø12: S235 bright zinc plated carbon steel.
STA Ø16-Ø20: S355 bright zinc plated carbon steel. Fv Fv
To be used in service classes 1 and 2 (EN 1995-1-1).

FIELD OF USE
• Timber-to-timber joints
• Timber-steel-timber joints

56 | STA | CONCEALED BEAM JOINTS

GEOMETRY AND MECHANICAL CHARACTERISTICS

d1

Nominal diameter d1 [mm] 8 12 16 20

Length L [mm] 60 ÷ 140 60 ÷ 340 80 ÷ 500 120 ÷ 400
steel S235 S235 S355 S355
Material fu,k,min [N/mm2] 360 360 460 460
fy,k,min [N/mm2] 235 235 355 355
Characteristic yield
My,k [Nmm] 24100 69100 191000 340000
moment

Mechanical parameters according to CE marking, in accordance with EN 14592.

MINIMUM DISTANCES FOR CONNECTORS SUBJECTED TO SHEAR STRESS(1)

Load-to-grain angle α = 0° Load-to-grain angle α = 90°

d1 [mm] 8 12 16 20 8 12 16 20
a1 [mm] 40 60 80 100 24 36 48 60
a2 [mm] 24 36 48 60 24 36 48 60
a3,t [mm] 80 84 112 140 80 84 112 140
a3,c [mm] 40 42 56 70 80 84 112 140
a4,t [mm] 24 36 48 60 32 48 64 80
a4,c [mm] 24 36 48 60 24 36 48 60

stressed end unloaded end stressed edge unload edge

-90° < α < 90° 90° < α < 270° 0° < α < 180° 180° < α < 360°

a2 α F
F
a2 α α a4,t a4,c
F α
F
a1 a1 a3,t a3,c

NOTES:
(1)
The minimum distances are compliant with EN 1995-1-1.

CONCEALED BEAM JOINTS | STA | 57

TIMBER-TO-STEEL AND ALUMINIUM STATIC VALUES
1 INTERNAL PLATE - SHEAR Rv,k

ta t ta
B

d1 L B ta Rvk,0° Rvk,30° Rvk,45° Rvk,60° Rvk,90°

[mm] [mm] [mm] [mm] [kN] [kN] [kN] [kN] [kN]

60 60 27 13,9 12,9 12,2 11,5 11,0
80 80 37 15,2 13,9 12,9 12,1 11,5
100 100 47 17,0 15,4 14,2 13,2 12,4
12 120 120 57 19,1 17,2 15,7 14,6 13.6
140 140 67 21,4 19,2 17,5 16,1 14,9
160 160 77 22,1 20,7 19,3 17,7 16,4
> 180 - - 22,1 20,7 19,6 18,7 17,8
80 80 37 25,5 23,6 22,2 21,0 19,7
100 100 47 26,8 24,6 22,8 21,4 20,2
120 120 57 28,7 26,1 24,0 22,4 21,0
140 140 67 31,1 28,0 25,6 23,7 22,2
16 160 160 77 33,7 30,2 27,4 25,3 23,5
180 180 87 36,5 32,5 29,5 27,0 25,0
200 200 97 39,4 35,0 31,6 28,9 26,7
220 220 107 40,9 37,6 33,9 30,9 28,4
240 240 117 40,9 38,2 36,0 32,9 30,3
120 120 57 39,0 35,5 32,8 30,6 28,9
140 140 67 41,2 37,1 34,1 31,6 29,7
160 160 77 43,8 39,2 35,8 33,0 30,8
180 180 87 46,8 41,6 37,7 34,7 32,2
20
190 180 87 46,8 41,6 37,7 34,7 32,2
200 200 97 50,0 44,3 39,9 36,5 33,8
220 220 107 53,3 47,0 42,3 38,6 35,6
240 240 117 56,8 50,0 44,8 40,7 37,4

GENERAL PRINCIPLES:

• Characteristic values according to EN 1995-1-1. • The values provided are calculated using 5 mm thick plate, a 6 mm thick
• The design values are obtained from the characteristic values as follows: grooved cut in the timber and a single STA dowel.
• For the calculation process a timber density ρ k = 385 kg/m3 has been con-
Rk kmod sidered.
Rd =
γM • Sizing and verification of the timber elements and metal plate must be done
separately.
• The coefficients γ M and kmod should be taken according to the current reg-
ulations used for the calculation.

58 | STA | CONCEALED BEAM JOINTS

 CORRECTIVE COEFFICIENT kF FOR DIFFERENT DENSITIES ρk

Strength class C24 GL22h C30 GL24h C40 / GL32c GL28h D24 D30
ρk [kg/m3] 350 370 380 385 400 425 485 530
kF 0,91 0,96 0,99 1,00 1,02 1,05 1,12 1,17

For different densities ρk the wood-side design strength is calculated as: R ' V,d = R V,d · kF.

EFFECTIVE NUMBER OF DOWELS nef FOR α = 0°

a1 [mm]
n. STA 5∙d 7∙d 10∙d 12∙d 16∙d 18∙d 20∙d
2 1,47 1,60 1,75 1,83 1,97 2,00 2,00
3 2,12 2,30 2,52 2,63 2,83 2,92 2,99
4 2,74 2,98 3,26 3,41 3,67 3,78 3,88
nef
5 3,35 3,65 3,99 4,17 4,48 4,62 4,74
6 3,95 4,30 4,70 4,92 5,28 5,44 5,59
7 4,54 4,94 5,40 5,65 6,07 6,25 6,42

In the case of multiple dowels placed parallel to the fibres, the effective number must be taken into account R’v,d = Rv,d · nef.
d = nominal dowel diameter

STAS - IMPROVED BOND DOWEL FOR SEISMIC LOADS

d1

L
The knurled dowel is available on request, it anticipates the standard requirement of the new EN 14592 ("FINAL DRAFT FprEN
14592:2019", 04/03/2019), guaranteeing a minimum withdrawal strength of 1 kN, necessary in seismic areas. The knurling
also responds to the provision of EC8 aimed at preventing the cylindrical shank elements from coming out from the joints
in the seismic zone.

STAS - WITHDRAWAL VALUES

5
Withdrawal strength

4
[kN]

0
1 2 3 4 5 6 7 8 9 10

Test number

14592 minimum M12 M16 M20

“Knurled pins" are the submitted to a utility model.

CONCEALED BEAM JOINTS | STA | 59

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