Hollow section fastener BoxBolt®

BoxBolt steel hot dip galvanized hexagon head

Art.-no. 04859081

Prices for customers after login

Hollow section fastener BoxBolt®

Art.-no. 04859081

Prices for customers after login



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DIN EN ISO 898-1, hot-dip galvanised steel grade 8.8.

Never exceed the permissible working loads. Before using hollow section fasteners, always check that the steel structure can withstand the required loads.

With general technical approval Z-14.4-482

BoxBolt® is a registered trademark of Access Technologies Limited, GB.

Product information

Würth Catalogue(X)

Catalogue page as PDF 1

Flip catalog


CAD Data (available after login)

Application area

For fastening to hollow sections or other hard-to-reach components. The fastener is especially suitable for applications where the installation point is only accessible from one side.


The connection is produced by tightening the screw while bracing the sleeve collar, resulting in expansion of the sleeve. The tightening torques can be applied using a torque spanner. The hollow section fastener is only approved for one-time use!

We recommend the BoxSokTM special tool for installation.

Thread type x nominal diameter


Screw length (l)

50 mm

Width across flats (S)

13 mm

Width across flats, sleeve (S)

22 mm

Sleeve diameter (d)

13.5 mm

Collar thickness (k)

6 mm

Sleeve length (l)

40 mm

Min./max. grip length (lk)

4-26 mm

Nominal drill hole diameter

14 mm

Tightening torque

25 Nm

Min. hole distance (A)

35 mm

Min. edge clearance (B)

13 mm




Hot dip galvanized



Required accessory:

Bolt socket head BoxSok™


Special tool for mounting BoxBolt® hollow profile fastener
x 1 pcs

Packaging unit

The packaging unit defines the number of articles in one packaging. In the catalog segment you can choose from different packaging units if a pop-up menu is displayed.

Just leave the field empty if you don't know the packaging unit when directly entering the article number in the shopping basket or when importing with Easy-/VarioScan. The packaging unit will be determined automatically.

Structure of our article number

The article number is made up of the following: VVVVAAABBB
VVVV = 4 digits for prefix number (please note that the first digit is currently always 0)
AAA = 3 digits for dimension part 1
BBB = 3 digits for dimension part 2

Example article number structures:
Example 1: Screw with dimensions of 4x10 mm:
00574 10 (2 spaces between the 4 and the 10)

Example 2: Screw with dimensions of 10x20 mm:
005710 20 (1 space between the 10 and the 20)

Example 3: Flat washer with an internal diameter of 6 mm:

Information on price and image display

Price per packaging unit (PU):
The displayed price is always in line with the displayed packaging, if the PU is 250 the price for 250 units, if the PU is 300 the price for 300 units.

Price with price key representation (PSL):
The price always applies to a quantity ruled through the price key:
Price for 1 unit
Price for 100 units
Price for 1000 units


The quantity shows the number of pieces or units of measure contained in the order or delivery for the respective article.
Art.-no. Cust. Mat. No.

Hazardous Material

Product information

Würth Catalogue

Catalogue page as PDF  | 

Flip catalog


Datasheets ()

CAD Data  | 




Technical information