Machine Screws - Slotted Round - UNF

A machine screw is a type of screw that is commonly used in industrial and manufacturing applications to secure components within engines, electronic products and general machinery.

This type of machine screw has a round, domed head with a slotted recess that can be installed with a flat-bladed screwdriver or bit. They are available in zinc plated, brass or stainless steel.

They are available with imperial threads only.

About UNF Thread

UNF stands for Unified National Fine. It is a common imperial thread type with more threads per axial distance than its UNC equivalent.

Unified thread types (UNF and UNC) were introduced at the beginning of World War 2 to enable the interchangeability of machinery manufacturing between the USA, Canada and Great Britain. Still commonly found on a vast array of old machines and vehicles in the UK, UNF and UNC threads continue to be the standard thread in the USA and Canada.

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3 Items

    1. Code MSUFSRSC025150
    2. Threads Per Inch 28
    3. Diameter 1/4"
    4. Material Steel
    5. Finish Self Colour
    6. Head Type Round Head Slotted
    7. Thread Type Imperial - UNF
    8. Length Under Head 1 1/2"
    9. Tapping Drill Size 5.5mm
    £10.20 £12.24
    1. Code MSUFSRSC025200
    2. Threads Per Inch 28
    3. Diameter 1/4"
    4. Material Steel
    5. Finish Self Colour
    6. Head Type Round Head Slotted
    7. Thread Type Imperial - UNF
    8. Length Under Head 2"
    9. Tapping Drill Size 5.5mm
    £12.60 £15.12
    1. Code MSUFSRZP010025
    2. Threads Per Inch 32
    3. Diameter 3/16"
    4. Material Steel
    5. Finish Bright Zinc Plated and Clear Passivation
    6. Head Type Round Head Slotted
    7. Thread Type Imperial - UNF
    8. Length Under Head 1/4"
    9. Tapping Drill Size 4.1mm
    £13.66 £16.39
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3 Items