Machining and Finishing of Threaded Connection
Stable Services has installed only precision machining capabilities, allowing the manufacture and repair of all down-hole rotary drilling equipment. Stable Services are licensed to API spec 7 and API spec 7-1.

Cold Working
Thread roots and stress relief features are cold rolled. Cold rolling creates a compressive layer that increases fatigue life by minimising crack initiation.

Stress Relief Features
API boreback box decreases the likelihood of fatigue failures. These features increase the connection flexibility and reduce high stress concentration that occurs adjacent to the end of engaged threads.

Stable Services’ machine park includes:
• Deep hole boring
• CNC hollow spindle lathes
• Manual hollow spindle lathes
• CNC milling machines
• Radial drills
• Grinding machines

All threads are machined using CNC machines. Taper, threads and stress relief grooves are machined in a single cycle. All API threads are cold rolled to improve fatigue resistance.

Phosphate
To prevent corrosion and galling and improve the adhesion of the thread compound, all connections are phosphatised.

Shot Peening
Shot peening is a cold-working process in which a metal part is bombarded by tiny balls of steel, cut-wire, glass or ceramic shot. Although shot peening is often confused with abrasive blasting, the two processes have very different effects. Abrasive blasting is used primarily to rid metals of corrosion and rust, while shot peening is used to work-harden metal and to increase its fatigue strength.

Make-up and Break-out Services
Make-up and break-out services are provided to improve rig economics, by breaking in the rotary connection prior to shipment to the rig site.