Hobson KBH46PCM100025 M10 x 25mm Metric Hex Bolt and Nut, Class 4.6, Plain

There are 62 Hobson metric hex bolt and nut items in class 4.6, plain finish: sizes M10 to M24, with lengths from 25mm to 300mm. Each item is shown with its Hobson part number, size, length and the pack quantity the supplier states.

Hobson lists class 4.6 as low tensile carbon steel, and its class and grade chart pairs class 4.6 with imperial grade 2 (manufacturer-stated).

The pitch shown for each size is the coarse pitch given in the Hobson thread table (manufacturer-stated). The supplier lists metric fine pitch items as separate products and says so in the name.

Spanner sizes (A/F) are from the Hobson spanner selection chart (manufacturer-stated).

Pack quantity varies with size and length and is shown for each item in the table.

Where this product is used

• Fixing timber to steel through a drilled hole, with a flat washer under the head and the nut
• Replacing a bolt and nut pair of the same thread form and diameter
• Workshop and site kits where the nut should arrive with the bolt instead of being ordered separately
• Assemblies that will be painted, oiled or enclosed after fitting
• General-purpose light fabrication, framing and non-critical joints
• The 62 items cover diameters from M10 to M24 and lengths from 25mm to 300mm; confirm the size against your drawing before ordering.

Choosing the finish

These hex bolt and nut sets are plain steel, with no coating beyond a light oil film, so they rust quickly in moisture.

Keep plain parts for dry indoor use, machinery and assemblies that get painted, oiled or enclosed. Outdoors or in damp areas, a hot dip galvanised or 316 stainless alternative is the better choice.

What the grade means

Class 4.6 means a general-purpose mild steel bolt. It is chosen for framing, light fabrication and joints where high strength is not needed.

For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification. Fasteners are not lifting rated unless marked.

Features

• 5 sizes: M10 to M24
• Class 4.6, Plain finish
• Lengths from 25mm to 300mm
• Pack quantity and part number for every item
• Spanner size (A/F) by size, from the Hobson spanner chart (manufacturer-stated)
• Supplied as a bolt and nut
• Plain (uncoated) steel for dry indoor and machinery use
• Class 4.6 general-purpose mild steel

Common specifications

Thread, strength and spanner size by diameter

Values in this table are from the Hobson thread table and spanner chart, and apply to the size shown (manufacturer-stated).

Key specifications

Selecting the right option

Choose the thread form first: the nut must match the bolt in thread form, diameter and pitch. Metric sizes are the nominal diameter in millimetres; compare the pitch in the table with your nut. Length is measured from under the head to the end of the bolt.

Related products

Related hex bolts: Hobson Metric Hex Bolt and Nut, Class 4.6, Plain, M10 to M36 x 20 to 450mm, Hobson XL Thread Hex Bolt and Nut, Class 4.6, Hot Dip Galvanised, M8 to M24 x 25 to 1500mm and Hobson Metric Hex Bolt and Nut, Class 4.6, Hot Dip Galvanised, M6 to M36 x 35 to 800mm.