Description
R25 Coupling Sleeve — 35 mm OD, 150 mm
The R25 coupling sleeve joins two R25 extension drill rods into one continuous drill string. It is machined from 40Cr / C45 steel, heat-treated to HRC 20–30, and threaded to the ISO 10208 R profile in left-hand rotation — the hand used on most R25 drifting and bolting rods.
The body is turned and the thread cut on CNC lathes, then checked against a master gauge so the sleeve runs true with the rods it connects. A 35 mm outside diameter keeps the sleeve slim enough to pass through tight collaring while still giving enough wall thickness for repeated make-and-break cycles.
Specification
- Model: R25 coupling sleeve
- Outside diameter: 35 mm
- Length: 150 mm
- Thread: R25, R thread profile to ISO 10208
- Rotation: left hand (right hand available on request)
- Material: 40Cr / C45 carbon and alloy steel
- Hardness: HRC 20–30
- Weight: 0.70 kg per piece
- Fits: R25 extension drill rods and R25 shank adapters
Features
- ISO 10208 R thread cut to gauge, so the joint seats without cross-threading or wobble.
- 40Cr / C45 steel heat-treated to HRC 20–30 balances thread wear resistance against toughness.
- Through-hardened body resists thread deformation when rods are broken out with a wrench.
- Consistent wall thickness keeps the drill string running true and reduces rod whip.
- Available with right-hand thread, other lengths and OEM marking on request.
Frequently asked questions
What does a coupling sleeve do?
It connects two extension drill rods end to end, so you can drill deeper than a single rod length. Coupling sleeves are also used between a shank adapter and the first rod.
Is this left-hand or right-hand thread?
The standard R25 sleeve is left-hand, which matches the rotation of most R25 drifting rods. Right-hand versions are made to order — confirm your rod rotation before ordering.
How do I know which thread size I need?
Match the sleeve to the thread on your rods: R25, R28, R32, R38, T38, T45 or T51. Send us a photo of the rod end and we will confirm the match.
Can you supply other lengths or diameters?
Yes. Length, outside diameter, thread type and rotation are all made to order, including OEM marking.
Related rock drilling tools
- R32 coupling sleeve — 42 mm OD, 160 mm / 190 mm
- Q945-R32 thread button bit — R32, 45 mm
- Q651-R32 anchor drill bit — R32, 51 mm
- Full rock drilling tool catalogue
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