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Blue Fireball T / T2 Thread Spacer Ring with 3mm Extension # S-T3

Blue Fireball T / T2 Thread Spacer Ring with 3mm Extension # S-T3

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  • T/T2 thread extension ring/barrel spacer
  • Provides 0.12" (3mm) of spacing *
  • Allows you to securely set or vary the spacing between T thread components
  • Has standard T threads (male on one side and female on the other)


  • Precision machined from aluminum and black anodized


  • Total Length = 0.17" (4.3mm)
  • Extension Provided = 0.12" (3mm) *
  • Length of External Male Thread = 0.05" (1.3mm)
  • Thread Specification (External Thread) = M42x0.75 Male
  • Length of Internal Female Thread = 0.06" (1.4mm)
  • Thread Specification (Internal Thread) = M42x0.75 Female
  • Maximum Outer Diameter = 1.81" (46mm)
  • Weight = 0.1oz (3g)

Additional Information:

* To get a spacing of 3mm with this spacer, your accessory must fit completely into the female T thread of this adapter. The length of the female T thread is only 1.4mm. If your accessory has a male T thread longer than this, then it will not screw in fully and the extension provided will be greater than 3mm.

Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.

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Filed under: Eyepieces & Accessories