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

The Hobson UNC socket set (grub) screw, plain point is a headless socket set (grub) screw with a UNC thread, turned with a hex key in the socket at one end (alloy steel). There are 4 items in 3/4", lengths 5/8" to 1-1/2". UNC means Unified National Coarse Thread and TPI means threads per inch.

Where this product is used

• Setting the position of a part where a screw head would be in the way
• Holding pulley, sprocket and coupling hubs on motor and gearbox shafts
• Securing knobs, handles and bearing collars on spindles
• Dry indoor machinery, tooling and equipment
• Plain (flat) points mark the shaft least and suit adjusting

Features

• 4 items: 3/4"
• Alloy steel
• Length 5/8" to 1-1/2"
• Plain finish: suited to dry indoor, oiled, painted or enclosed use
• Alloy steel construction

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.

These socket set (grub) screws are plain steel, with no coating beyond a light oil film, so they rust quickly in moisture. That makes it a good fit for dry indoor work, machinery, and assemblies that are painted, oiled or enclosed after fitting. For anything outdoors or damp, choose a hot dip galvanised or 316 stainless option instead. Plain alloy steel socket screws are the normal choice for tooling and machine building, where the parts are usually oiled or enclosed.

UNC is the coarse inch thread, the general-purpose choice; it only mates with UNC nuts and tapped holes of the same diameter. 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 UNF Socket Set (Grub) Screw, Alloy Steel, Knurled Cup Point, #10 to 1/2", Hobson UNC Nylon Hex Socket Grub Screw, Natural, 3/8" x 1", Pack of 25 and Hobson BSW Socket Set (Grub) Screw, Alloy Steel, Plain, Knurled Cup Point, 1/2" x 3/4" and 1".