8/2/2019 Dwn 333 T Head Bolts Installation

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   2   1

41

2218

   2   2

40

   1   2

20

10

40

   2   5

18   1   5

28

12

54

   3   3

22

49

   3   0

22

72

   4   9

33

   4   2

26.5

55

   3   0

50

22

52

   3   4

22

   4   8

72

33

   1   7

38

18

   2   3

38

18

   2   0

29

14

H 4.64.6 H 4.64.64.6.6

HS - 1/02 - EE

Page 1/2

Installation Guidance

for Halfen T-head bolts HS, HZS, HSRin Halfen channels HTA or HZA

Framingchannel

Characte-risticgrooves 

Marking slot to check the correctengagement of the bolt

Teeth

Double

slot*

Identification

Markings on the bolt head

HZA 41/22HZA 29/20HZA 38/23

HZS 41/22ÁHZS 38/23Á HZS 29/20Á

HS 72/48 À HS 50/30 À

HTA 40/22

HS 40/22 À

HTA 72/49

HS 72/48 HS 50/30

HTA 40/25

HS 40/22

HTA 38/17

HS 38/17

HTA 28/15

HM 20/12

HS 28/15 HS 20/12

Selection of Halfen T-head bolts to fit to the Halfen channel Halfen channels HTA or HZA and the corresponding Halfen T-head bolts HS, HZS, HSR, profile dimensions in mm. Also applicablefor Halfen framing channels HM and HL accordingly, see also catalogue MT.

Note: always use Halfen T-headbolts in combination with thehexagonal nuts, which are

supplied together with the bolts.

À Instead of type HS also Halfenbolts type HSR with nibs can beused.Á Toothed head

Strength grade 4.6(available in electroplatedor hot-dip galvanised.)

Strength grade 8.8(available in electroplatedor hot-dip galvanised.)

Stainless steel,material grade A4-50

Stainless steel,material grade A4-70

Stainless steel,material grade A2-50

Stainless steel,material grade A2-70

HTA 54/33 HTA 49/30

HTA 55/42 HTA 50/30HTA 52/34HTA 72/48

Manufacturer sign Halfen

Strength or material grade

 Alternative T-head shape

Note: The T-head bolts used for Halfen channels must show the manufacturers marking “H” or “HALFEN”. The use of any other T-head boltis not recommended.

*indicates 8.8 grade steel

8/2/2019 Dwn 333 T Head Bolts Installation

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HS - 1/02 - EE

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M12

25 (40)

70

M 6 

3 -

M 8

 8

-

M10

 15

48

M16

60 (70)

110

M27

300

Á

M30

300

Á

M20

120

300

M24

200

400

4.6A2-50/70A4-50/70

8.8

Recommended tightening torque [Nm] for bolt diameter:Strength/material grade

À Values in ( ) are for Halfen bolts HZS.Á On request

À À

Fig. 1

Fig. 3

Fig. 4

Fig. 6

Fig. 5

Fig. 2

Table 2: Recommended torques for Halfen T-head bolts [Nm]

Fixing the Halfen T-head bolt to the Halfen channel

Fig. 1:Polystyrene bead filler:

use an appropriate tool (e.g. carpentershammer, hook with flat tip, screwdriver orsimilar).

Fig 2:Easy strip (combi) filler:

catch the strip at one end by hand andpull it out with the aid of a tool, e.g. ascrew driver.

  U  -

  1  0  2

 -  1  1  /  0  3

Fig. 3:The Halfen T-head bolt can be inserted into the channel slot at any point alongthe channel length. After a 90° turn clockwise, the T-head of the bolt locksinto position to enable the nut to be tightened. Halfen T-head bolts must not

be positioned in the overhang beyond the last anchor at the channel ends. Thechannel overhang is min. 35 mm from the last anchor, and the positions of theanchors (when bolt anchors) can be clearly seen through the channel slot.After fixing: check the correct engagement of the T-head bolt: the slot on theshank end of the bolt must be perpendicular to the channel longitudinal axis.

Fig. 4:If the face of the channel is recessed due to concrete vibration, thentightening the T-head bolts may bend the channel lips. If a problem occursit may be necessary to pack the lips of the channel as shown in Fig. 4. Inextreme cases it may also be necessary for the job engineer to check forbending in the bolt shank.

Fig. 5:Washers should always be used under the nut, as described by the job engi-neer.

For guidance: - over component with drilled hole - normal form A washerover component with punched slot - heavy plate washer.nut direct to channel lips (see fig. 5) - heavy plate washer.

Fig. 6: Tighten the hex nut. Torque is not normally checked as normal siteworkmanship is acceptable. If torque settings are required, please see Table 2.Shimming to a recessed

Halfen channelWasher between nut andchannel face

Removing the foam filler from the Halfen channel after striking the formwork

Installation Guidance

for Halfen T-head bolts HS, HZS, HSRin Halfen channels HTA or HZA

Halfen Limited Humphrys Road Woodside Estate Dunstable LU5 4TP

Tel: 08705 316 300 Fax: 08705 316 304

Email: info@halfen.co.uk Web: www.halfen.co.uk

Insert the T-head bolt and turn clockwise by 90°

Fixing the Halfen T-head bolt by tightening the hexagonalnut using a torque wrench