Applications
- Rotary-table drilling systems
- Torque transmission between swivel and drill string
- Land-rig and workover operations
DRILL STRING & BHA
Kellys
Square and hexagonal kelly supply reviewed against drive dimensions, connections, length and rig-interface requirements.
StandardAPI 7-1 · API 7-2 connection references
Size / supply rangeSquare and hexagonal sizes according to rig interface · Drive length, total length and bore by order
Grades / materialsHeat-treated alloy-steel material route · Mechanical properties and hardness confirmed by specification
Connections / optionsUpper connection to swivel system · Lower rotary-shouldered connection to drill string
TECHNICAL PROCUREMENT
Define kellys around the operating requirement.
Availability and final supply scope are confirmed after technical review. OAK PIPE coordinates the product configuration, manufacturing route, inspection requirements and delivery package against the enquiry.
Configuration options
- Square and hexagonal kellys
- Upper and lower connection combinations
- Kelly drive bushings, saver subs and handling accessories
Quality & documentation
- Full-length dimensional and straightness control
- Material, mechanical properties and connection inspection
- Ultrasonic, magnetic-particle and surface inspection as specified
PROCUREMENT BASIS
Technical scope at a glance.
This summary supports preliminary comparison. Final dimensions, tolerances, availability and acceptance requirements are confirmed against the enquiry and governing purchase documents.
| Reference basis | API Spec 7-1 / ISO 10424-1 and agreed dimensional, material and connection requirements |
|---|---|
| Product configuration | Square and hexagonal kellys · Upper and lower connection combinations · Kelly drive bushings, saver subs and handling accessories |
| Verification basis | Full-length dimensional and straightness control · Material, mechanical properties and connection inspection · Ultrasonic, magnetic-particle and surface inspection as specified |
| Commercial confirmation | Size or drawing · Material / grade · Quantity · Service conditions · Inspection scope · Destination and schedule |
The purchase order, approved drawings and agreed specification take precedence over this website summary.
RFQ CHECKLIST
Information to include with your enquiry.
A clear starting specification allows faster technical review and a more accurate commercial response.
Prepare Your RFQ- 01Square or hexagonal type and nominal size
- 02Overall length, bore and connections
- 03Material or strength requirement
- 04Accessories, NDT, inspection and documentation
PRODUCT OVERVIEW
Kellys for project-specific requirements.
Kellys transmit rotary-table torque to the drill string while allowing axial movement through the drive bushing. Square and hexagonal drive sections require close coordination of across-flat dimensions, corner geometry, drive length, total length, bore, upper and lower connections and straightness.
API 7-1 is the principal current API product reference for square and hexagonal kellys, while API 7-2 applies to the threading and gauging of rotary-shouldered connections. The applicable edition, connection combination and rig-interface dimensions must be confirmed on the order.
Manufacturing control covers alloy-steel material, heat treatment, trepanning or boring, drive-section machining, end connections, stress-relief features, straightness, NDT and dimensional verification.
TECHNICAL SCOPE
Supply basis at a glance.
Use this overview to prepare an enquiry. The final size, grade, connection and inspection combination is confirmed against the governing specification.
| Technical field | Available or review basis |
|---|---|
| Standards | API 7-1 · API 7-2 connection references · Customer rig and drill-string specification |
| Size & supply range | Square and hexagonal sizes according to rig interface · Drive length, total length and bore by order · Upper and lower end configuration coordinated with swivel and drill string |
| Grades & materials | Heat-treated alloy-steel material route · Mechanical properties and hardness confirmed by specification |
| Connections & options | Upper connection to swivel system · Lower rotary-shouldered connection to drill string · Connection combinations confirmed at enquiry |
PRODUCT PARAMETERS
Recorded product specifications.
The values below come from the maintained OAK product record. Contract dimensions, tolerances and acceptance criteria remain subject to final order review.
| Parameter | Specification / value |
|---|---|
| Reference standards | API 7-1, API 7-2 and rig-interface requirements |
| Types | Square and hexagonal kellys |
| Critical dimensions | Across flats, drive length, total length, bore and end connections |
APPLICATIONS
Where this product is used.
- Rotary-table drilling rigs
- Torque transmission and drill-string suspension
- Conventional land and selected workover rigs
SERVICE & SELECTION
Conditions considered during selection.
- High torsional and axial loading
- Repeated movement through drive bushing
- Surface wear and straightness sensitivity
- Fatigue at section and connection transitions
MANUFACTURING
Controlled production route.
Key operations are coordinated against the product specification and order requirements.
01Material identity and heat treatment
02Trepanning or boring
03Square or hexagonal drive-section machining
04Connection machining
05Straightening, surface treatment and marking
INSPECTION & TESTING
Verification before release.
- Mechanical properties and hardness
- UT and MPI as specified
- Across-flat, bore and length inspection
- Straightness verification
- Connection gauging
QUALITY DOCUMENTS
Evidence supplied with the order.
- MTC
- Heat-treatment and mechanical-test reports
- NDT and dimensional records
- Connection inspection report
PACKING & DELIVERY
Prepared for the destination and handling plan.
Marking, protection and shipment details are confirmed during order review.
Connection protectors
Drive-section surface protection
Supported heavy-length transport arrangement
RFQ CHECKLIST
Information needed for a practical quotation.
Share the available technical and commercial requirements. Missing details can be reviewed with our team.
Request a Quote- 01Square or hexagonal type
- 02Nominal size, drive length, total length and bore
- 03Upper and lower connections
- 04Rig drive-bushing interface
- 05Material, inspection, quantity and destination
PRODUCT & PROCESS VIEWS
Product views and manufacturing context.
Representative product, production and inventory views support preliminary identification. Final supply details are confirmed against the quotation.
START A CONVERSATION
Have a specification or product list?
Send it to OAK PIPE for technical and commercial review.