Hobson did you know flyer
HBS-Bolt CSK Countersunk Blind Bolt for Hollow Steel: Sizes and Grip (Did You Know)
Hobson's one-page "Did You Know" flyer for the HBS-Bolt CSK, a countersunk blind bolt for fixing steel to hollow steel sections from one side (part KBB88GKM). It lists sizes M8 to M16 with length, grip range and hex size, and shows the 3-part and 5-part assemblies.
What this covers
- Sizes, lengths and grip ranges
- 3-part and 5-part assembly
- Applications
For HBS Blind Bolt.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Blind bolt for one-sided installation, fixing steel to square, rectangular and circular hollow sections where access is limited.
- Hot dip galvanised, HEC marked, class 8.8 (table heading). Countersunk, with a collar that has across flats for an open end spanner.
- M8 and M10: 50, 70 and 90mm long, grips 3 to 22mm, 22 to 41mm and 41 to 60mm. Hex size 5mm (M8) and 6mm (M10).
- M12: 55, 80 and 100mm long, grips 3 to 25mm, 25 to 47mm and 47 to 69mm, 8mm hex. M16: 70, 100 and 120mm long, grips 12 to 29mm, 29 to 50mm and 50 to 71mm, 10mm hex.
- M8, M10 and M12 are 3-part assemblies (bolt, cone, sleeve with integrated collar). M16 is a 5-part assembly that adds a rubber washer and a separate collar.
- The cone has interlocking grooves to stop it loosening, and the sleeve expands during installation.
- The flyer gives no torque or edge distance figures; it refers to the product data sheet for those.
Who it helps: Steel fabricators and engineers fixing to hollow sections where only one side can be reached.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.