Hobson data sheet
Class 4.6 Shoulder Purlin Bolt Assembly (KBOMS): Size and Torque Data Sheet
Hobson's one-page product data sheet for its class 4.6 shoulder purlin bolt assembly, part KBOMSZCM120030. It gives the bolt and nut dimensions, indicative tightening torque and bolt tension for the single M12 size.
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.
- The assembly is a property class 4.6 shoulder head bolt, a class 5 nut and a flange washer. It comes in zinc plated (ZP) only.
- One size, M12: 19mm across flats, 27.5mm flange diameter, 16mm shoulder diameter and 5mm shoulder depth.
- Indicative tightening torque 25.0 N-m for 9,500N 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 checking the shoulder bolt dimensions.
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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.