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https://www.litechtools.com/tapered-drill-rods/

Tapered Drill Rods
Tapered metal rod is suitable for small pneumatic rock drills or hydraulic rock drills for shallow hole drilling operations, and are generally made of H22 and H25 hexagonal hollow drill steel. The tapered drill rod needs to be matched with the taper drill bit for rock drilling, and It is usually used in rock drilling operations in quarries, coal mines, roadbeds, construction and other fields. Conventional taper angles for tapered drill rods are 7°, 11°and 12°.

Specification Of Tapered China H25 Drill Rods
LengthDiameterWeightModel No.
[mm][ft-in][mm][in][kg]
18005' 91"227/8"5.8H22-T7-1800
Shank H22×108mm, Hex 22, 7°24007' 10"227/8"7.6H22-T7-2400
18005' 91"251"8.2H25-T7-1800
Shank H25×108mm, Hex 25, 7°24007' 10"251"6.4H25-T7-2440

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