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A. It is a roller set for R60 and R110 tools, configured for British threads with a 12 threads per inch pitch.
A. They use it when restoring coarse BSW, BSF, BSPP or BS externals at 12 tpi on larger fittings and shafts.
A. The rollers are fitted according to the arrangement shown for 12 tpi British threads in the tool’s documentation.
A. Coarse pitches require rollers matched to the wide spacing and depth of the thread to reform it accurately.
A. It is supplied in a pack around 50 x 50 x 50 mm, labelled with pitch and series details.
A. Yes, within the tool’s diameter range and where the British thread form is appropriate.
A. Use a tpi gauge to verify 12 threads per inch and inspect the thread form against British standards.
A. It enables reuse of existing components by repairing threads rather than replacing costly parts.
A. Clean, lightly oil and store them with other British roller sets in clearly marked compartments.
A. Yes, wherever 12 tpi BSW, BSF, BSPP or BS threads require restoration within tool limits."
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