Hobson did you know flyer
Class 8 Nyloc Hex Nuts, Fine and Extra Fine Pitch (Did You Know)
A one-page Hobson flyer for class 8 Nyloc hex nuts made to DIN 985, zinc plated, in large sizes with fine and extra fine pitch. It also explains prevailing torque and how to allow for it.
What this covers
- Sizes and pitch
- How Nyloc works
- Prevailing torque
For Nyloc Nut.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Class 8, zinc plated (RoHS compliant), made to DIN 985. Part numbers start NN08ZFM.
- M24, M27 and M30 in 2.00mm and 1.50mm pitch (the 1.50mm parts end in F); M33 and M36 at 3.00mm. Other sizes from M8 to M22 are also available.
- A thin nylon ring inside the top of the nut adds friction, so the bolt does not loosen.
- That friction is called prevailing torque: the torque needed just to turn the nut. None of it goes into tightening the bolt.
- Rule of thumb: add the prevailing torque to the torque value when tightening a Nyloc nut.
Who it helps: Fitters tightening large locknuts to a torque figure.
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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.