Hobson data sheet
Class 4.6 Flange Purlin Bolt Assembly (KBFMS): Sizes and Torque Data Sheet
Hobson's one-page product data sheet for its class 4.6 flange purlin bolt assemblies, part series KBFMS. It lists five assemblies in M12 and M16 with bolt and nut dimensions, indicative tightening torque and bolt tension.
What this covers
- Assembly parts
- Dimensions
- Indicative tightening torque
- Installation reminder
For Purlin Bolt.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Each assembly is a property class 4.6 flange bolt and a class 5 flange nut, zinc plated (ZP) or hot dip galvanised (HDG).
- M12: KBFMSGCM120030 (30mm HDG), KBFMSZCM120030 (30mm ZP), KBFMSZCM120055 (55mm ZP). M16: KBFMSZCM160030 and KBFMSZCM160035 (30mm and 35mm ZP).
- Indicative tightening torque: M12 HDG 28.0 N-m, M12 ZP 25.0 N-m (9,500N bolt tension); M16 ZP 62.0 N-m (17,650N bolt tension).
- The torque figures are a guide only, for use when the engineer or supplier gives no torque. They are worked out from T = P x k x D, with P at 50% of the bolt's proof load and k of 0.22 for zinc plated and 0.25 for galvanised, assuming all bearing surfaces are in full contact. The engineer should confirm the final tension and torque.
- Install square: the base of the head and the base of the nut must sit in full contact with the parts being fastened. Hole sizes to AS 4600 or as the design engineer specifies.
Who it helps: Shed and steel frame builders bolting purlins, and staff matching a purlin bolt size and finish.
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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.