METRIC THREAD

METRIC THREAD

Metric threads, the most widely used general-purpose screw threads globally, are defined by the ISO Metric Screw Thread standard (ISO 68). They are characterized by a symmetric V-shape profile with a 60° flank angle. 

Designation System

A metric thread is designated by the letter M followed by its nominal major diameter in millimetres. If the pitch is not the standard "coarse" pitch, it is specified after the diameter, separated by an "x" (or a dash). 

  • M8: Refers to a coarse thread with a nominal diameter of 8 mm (and an implied standard pitch of 1.25 mm).
  • M8x1: Refers to a fine thread with a diameter of 8 mm and a pitch of 1 mm. 

Coarse vs. Fine Threads

Metric threads are available in two primary pitch types, which are not related to manufacturing quality. 

  • Coarse Threads:
    • Feature a larger pitch (distance between threads).
    • Are the more common and general-purpose type, widely available and suitable for most applications.
    • Allow for quick assembly and disassembly.
  • Fine Threads:
    • Have a smaller pitch, meaning more threads per unit of length.
    • Offer enhanced strength and better resistance to loosening from vibration.
    • Require a longer thread engagement and are often found in automotive and aerospace applications. 

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Code Description Price Quantity
SSANM04 M4 ST/ST AEROTIGHT SELF LOCKING NUT
100 In Stock for despatch
Price Unavailable
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SSANM05 M5 ST/ST AEROTITE SELF LOCKING NUT
18 In Stock for despatch
£1,160.00 (exc VAT) per HUND
£1,392.00 (inc VAT)
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SSANM06A M6 ST/ST AEROTITE SELF LOCKING NUT
Out of Stock
Price Unavailable
-
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SSANM08 M8 303 S31 ST/ST AEROTITE SELF LOCKING NUT
Out of Stock
£462.10 (exc VAT) per HUND
£554.52 (inc VAT)
-
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SSANM12A M12 ST/ST AEROTITE SELF LOCKING NUT
Out of Stock
£1,300.00 (exc VAT) per HUND
£1,560.00 (inc VAT)
-
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SSANM16A M16 ST/ST AEROTITE SELF LOCKING NUTS A4
Out of Stock
£2,870.00 (exc VAT) per HUND
£3,444.00 (inc VAT)
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SSANM20 M20 ST/ST AEROTITE SELF LOCKING NUT
8 In Stock for despatch
£2,591.00 (exc VAT) per HUND
£3,109.20 (inc VAT)
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SSANM24A4 M24 ST/ST AEROTITE SELF LOCKING NUT A4-80
Out of Stock
£6,300.00 (exc VAT) per HUND
£7,560.00 (inc VAT)
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