Hobson BSW Socket Set (Grub) Screw, 1"

The Hobson BSW socket set (grub) screw is a headless socket set (grub) screw with a BSW thread, turned with a hex key in the socket at one end (alloy steel, plain). There are 2 items in 1/2", lengths 3/4" and 1". BSW means British Thread Standard Whitworth 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
• Holding pulley, sprocket and coupling hubs on motor and gearbox shafts
• Replacing socket set screws of the same thread form, diameter and length
• Dry indoor machinery, tooling and equipment
• Knurled cup points resist working loose under vibration
• Choosing between the 2 items here: they cover 1/2" diameter only and lengths from 3/4" to 1"

Features

• 2 items: 1/2"
• Alloy steel, plain
• Length 3/4" and 1"
• Plain finish: suited to dry indoor, oiled, painted or enclosed use
• 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.

These socket set (grub) screws are plain steel, with no coating beyond a light oil film, so they rust quickly in moisture. It suits dry indoor jobs, machinery, and assemblies that will be painted, oiled or enclosed. Where the job is outside or damp, move to hot dip galvanised or 316 stainless. Plain alloy steel socket screws are the normal choice for tooling and machine building, where the parts are usually oiled or enclosed.

BSW is British Standard Whitworth, an imperial thread with a 55 degree form that is found on older British-origin machinery. It only mates with BSW parts 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 Metric Nylon Hex Socket Grub Screw, Natural, M5 to M10, Hobson Metric Nylon Slotted Grub Screw, Natural, M3 to M10 and Hobson UNC Socket Set (Grub) Screw, Alloy Steel, Plain, #10 to 5/8".