Box Section End Caps

Box section end caps are a popular and widely used type of tube plug or insert, commonly found in all manner of structural systems technologies. They’re particularly handy in various types of aluminium modular profile systems - especially in the sorts of flow racks, frames and mounting/housing assemblies used to support electronic components and devices in a wide variety of throughout clean rooms, offices and hospitals.


Our full range of tube stops and plugs, including many different shapes, styles and sizes of box section end caps, is sourced from leading manufacturers such as FlexLink, Rose+Krieger, and our brand RS PRO.

What is a box section end cap, and how are they used?

This type of end cap is a simple plastic (polyamide or PE) tube insert - sometimes called a square bung, foot plug, tube cap or tube end plug - that’s used to seal off a ‘box section’ or length of square aluminium tubing in furniture, devices or rack mounting assemblies.

Sealing off the open ends of these hollow tubes in a frame or flow rack serves multiple practical purposes, including:

  • Improved hygiene and cleanliness in clean rooms and hospitals
  • Prevention of dust ingress and particle build-up
  • Reduction in build-up of static electricity (when using ESD-capable tube stops), helping protect electrostatically sensitive devices and components from shock damage
  • Neat, professional-looking finishing of frames, stands and legs for a cleaner and tidier look on all manner of support racks, appliances and machinery, or office and patio furniture

Most square tube caps are easy to push-fit and insert by hand, being constructed to include a series of horizontal internal ribs that help provide a secure and flexible fitting for the appropriate tube size.

Our box section end caps are available in square tube and strut profiles ranging from 20mm to 80mm.


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Description Price Structural Element Type Fits Tube Diameter Fits Square Tube Profile Fits Strut Profile Fits Round Tube Size Fits Groove Size Material Colour Product Family Product System Priced to Clear Series
RS Stock No. 621-764
BrandRS PRO
£11.79
1 Pack of 12
Pack(s)
Square End Cap - 25mm 25 mm - - Plastic Black RS Square Tube System - - -
RS Stock No. 526-0667
BrandRS PRO
£9.47
1 Bag of 100
Bag(s)
Square Tube Plug - 25.4mm - - - PE Black RS - - -
RS Stock No. 629-0120
BrandRS PRO
£7.05
1 Bag of 100
Bag(s)
Square Tube Plug - 20mm - - - PE Black RS - - -
RS Stock No. 629-0142
BrandRS PRO
£8.98
1 Bag of 100
Bag(s)
Square Tube Plug - 25mm - - - PE Black RS Square Tube System - - -
RS Stock No. 629-0158
BrandRS PRO
£24.32
1 Bag of 100
Bag(s)
Square Tube Plug - 38mm - - - PE Black RS - - -
RS Stock No. 629-0136
BrandRS PRO
£9.85
1 Bag of 100
Bag(s)
Square Tube Plug - 30mm - - - PE Black RS - - -
RS Stock No. 420-5293
Mfr. Part No.90404-5
£3.91
1 Bag of 5
Bag(s)
Square Tube Plug - 40mm 40 mm - - PE Black Rose+Krieger - - -
RS Stock No. 248-9887
Mfr. Part No.XCBE 44
BrandFlexLink
£17.97
1 Bag of 10
Bag(s)
Square End Cap - - 44 mm - 11mm Polyamide Grey FlexLink XC - -
RS Stock No. 420-5287
Mfr. Part No.90402-5
£2.34
1 Bag of 5
Bag(s)
Square Tube Plug - 30mm 30 mm - - PE Black Rose+Krieger - - -
RS Stock No. 249-0067
Mfr. Part No.XDBE 22 L
BrandFlexLink
£12.47
1 Bag of 10
Bag(s)
Square End Cap - - 22 mm - 5.5mm Polyamide Grey FlexLink XD - -
RS Stock No. 261-2037
Mfr. Part No.XCBE 88
BrandFlexLink
£37.31
1 Bag of 10
Bag(s)
Square End Cap - - 88 mm - 11mm Polyamide Grey FlexLink XC - -
RS Stock No. 331-4009
Mfr. Part No.XCBE 64
BrandFlexLink
£31.83
1 Bag of 10
Bag(s)
Square End Cap - - 64 mm - 11mm Polyamide Grey FlexLink XC - -
RS Stock No. 249-0231
Mfr. Part No.XDEE 22
BrandFlexLink
£12.47
1 Bag of 10
Bag(s)
Square End Cap - - 22 mm - 5.5mm Polyamide Grey FlexLink XD - -
RS Stock No. 289-9284
Mfr. Part No.XFBE 30
BrandFlexLink
£18.69
1 Bag of 10
Bag(s)
Square End Cap - - 30 mm - 7.2mm Polyamide Grey FlexLink XF - -
RS Stock No. 289-9290
Mfr. Part No.XFEE 30
BrandFlexLink
£18.69
1 Bag of 10
Bag(s)
Square End Cap - - 30 mm - 7.2mm Polyamide Grey FlexLink XF - -