M2.5 x 0.45p Metric Coarse Plain Black Uncoated Class 14.9 Cup Point Socket (1.27mm Key) Set Screws Grub DIN 916

About Socket Set Screws (Grub Screws)

Socket Set Screws (commonly called grub screws) are headless fully-threaded screws with a hex socket drive at one end and a cup, flat, dog or cone point at the other. Driven flush or below the surface using an Allen key. Used to lock a shaft inside a hub (pulley, gear, collar), tension a stud in a tapped hole, and anywhere the head of a fastener must not protrude above the work face. Manufactured to DIN 916 for the cup point (most common) and other point variants per ISO 4026 or ANSI B18.3.

Recommended use Indoor, oiled or sacrificial-wear applications where the fastener is replaced periodically. Common in machinery internals, ground-engaging equipment subject to wear, and any high-tensile assembly that will be painted, oiled or sealed after install.

Frequently Asked Questions

Material & Coating

Plain Black Uncoated Carbon steel. No corrosion protection. The dark colour is a thin oxide layer from the heat treatment process, not a corrosion barrier. Appearance varies from light grey to dark black across batches due to the heat treatment process, so colour consistency is not guaranteed between orders.

Important Will corrode rapidly in any wet or humid environment. NOT suitable for outdoor or coastal use without a separate coating.

Class Metric fasteners are classified as class 2, 4.6, 8.8, 10.9, 12.9, 14.9. See the head marking chart and full strength table.

Thread Pitch & Terminology

Thread Pitch (Metric) Metric fasteners measure thread pitch as the distance between thread peaks, expressed in millimetres. Metric also branches into three series: coarse (the default; widest tolerance, easiest to tap), fine (a tighter pitch for higher clamp load or thinner walls), and extra fine (the tightest pitch, used for thin-wall tube, precision instruments, and aerospace fittings where vibration loosening must be minimised). Always match the series as well as the size - a metric fine nut will not engage a metric coarse bolt of the same diameter, and an extra fine nut will not engage either. This product has a 0.45mm coarse pitch, meaning the peaks are 0.45mm apart.

How to Measure

Fastener Length This product has no head, so the length is the overall length - measured from one end to the other.

Thread Length Socket Set Screws (Grub Screws) are fully threaded. There is no head or shank. If the length is 25mm, the thread length is 25mm.

Resources

Pricing & Delivery

Includes GST, a Tax Invoice and Free Standard Delivery anywhere in Australia.

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Disclaimer

Technical data Researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately.

Measurements Sizes are taken from supplier catalogues or hand-measured and should be used as a guide. Minor variation between batches is normal. Stock is sourced from various suppliers, so differences may exist between batches in thread length, markings, appearance or finish.

Product Photos & PDF Data Sheets Represent the product type, not exact size. PDFs are a reference guide only. Specifications may change without notice.

If you see any problems with any of our specifications or you require additional information please contact us.