Hobson Metric Hex Coupling Nut, M8

The Hobson metric hex coupling nut comes in 4 sizes: M8 to M16; mild steel, zinc finish. A hex coupling nut is a long hex nut used to join two threaded rods or studs end to end. These metric nuts are Grade 5.

Imperial screws and nuts use a grade for strength level and metric ones use a class, so confirm the strength level you need before ordering. The finish is zinc.

Where this product is used

• Joining two lengths of threaded rod end to end
• Extending hanger rods for suspended services such as pipework, ducting and cable tray
• Tie-rod assemblies where a rod has to be lengthened on site
• Dry, indoor and sheltered locations such as workshops, enclosed machinery and interior fit-out

Features

• 4 sizes: M8 to M16
• Metric thread
• Mild steel, zinc finish
• Grade 5
• Pack quantity shown for each item
• Zinc plated: suited to dry, indoor and sheltered use
• Material: mild steel

Key specifications

Choosing the right option

Choose the thread form first: the nut and its bolt or stud must match in thread form, diameter and pitch. The second figure in each size (for example 50mm in M16 x 50mm) is the nut length; choose it to suit the rods you are joining.

A zinc plated finish gives light corrosion protection indoors and under cover. The coating is thin, so outdoor exposure without extra protection is generally not recommended, and treated pine calls for a different finish. For weather-exposed work, look at a hot dip galvanised version instead; within about 1 km of the sea, 316 stainless is generally the safer choice.

This long nut is for joining threaded rod. The rod and the nut need the same diameter and pitch, and each rod should be wound well into the nut. Take the nut class from the bolt specification you are working to. For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification. Fasteners are not lifting rated unless marked.

Related nuts: Hobson Metric Hex Coupler Nut, Class 5, Hot Dip Galvanised, M24 to M36, Hobson Metric Hex Coupler Nut, Class 5, Zinc Plated, M6 to M36 and Hobson BSW Hex Coupler Nut, Zinc Plated, 1/4" to 7/8".