Hobson UNF Socket Set (Grub) Screw, 1/2" / 1/2"

The Hobson UNF socket set (grub) screw is a headless socket set (grub) screw with a UNF thread, turned with a hex key in the socket at one end (alloy steel). There are 7 items: #10 to 1/2", in lengths from 1/4" to 3/4". UNF means Unified National Fine Thread and TPI means threads per inch.

Every item is supplied as a box of 100.

Where this product is used

• Setting the position of a part where a screw head would be in the way
• Securing knobs, handles and bearing collars on spindles
• Replacing socket set screws of the same thread form, diameter and length
• Knurled cup points resist working loose under vibration
• Choosing between the 7 items here: they cover diameters from 1/4" to 1/2" and lengths from 1/4" to 3/4"

Features

• 7 items: #10 to 1/2"
• Alloy steel
• Length 1/4" to 3/4"
• Material: alloy steel

Key specifications

Choosing the right option

Choose the thread form first: the grub screw and the tapped hole must match in thread form, diameter and pitch. A grub screw has no head, so the length is the overall length.

UNF has more threads per inch than UNC for the same diameter, giving a finer adjustment. It does not mate with UNC parts. For load-critical, structural or lifting joints, confirm the fastener against the engineer's specification. Fasteners are not lifting rated unless marked.

Related items: Hobson UNC Nylon Hex Socket Grub Screw, Natural, 3/8" x 1", Pack of 25, Hobson BSW Socket Set (Grub) Screw, Alloy Steel, Plain, Knurled Cup Point, 1/2" x 3/4" and 1" and Hobson Metric Nylon Hex Socket Grub Screw, Natural, M5 to M10.