Threaded borewell pipes assemble mechanically with couplings; bevel-end pipes are prepared for welding. Threaded joints reduce site welding and speed lowering, while bevel ends can lower pipe cost but move quality risk to weld fit-up, welder skill, alignment, coating repair and inspection. A Kanpur RFQ must name T&C, flush joint or bevel end before yard loading.
What threaded and bevel-end borewell pipes are
A threaded-and-coupled length arrives with a male thread and a matching socket or coupling. A bevel-end length is only prepared for a field butt weld. IS 4270:2001 clause 1.1 lists both as joint types for steel water-well tubes. Neither finish is a grade or a wall class.
Screwed-and-socketed butt joints and screwed flush butt joints are mechanical. The crew makes up the joint with wrenches and lowers the next piece. Flush joints keep OD constant. T&C joints add a coupling collar, so verify the offered coupling OD against the drilled hole and pump envelope.
Plain bevelled ends are for butt-welded joints. The 2001 text sets geometry in clause 9: both ends bevelled at 30° from a line perpendicular to the axis, root face 1.6 ± 0.8 mm; one end bevelled at 45° ± 2.5° with the same root face. Square-cut plain ends are also allowed when the purchaser asks. That is weld preparation, not a thread.
IS 12818 uPVC uses plastic sockets and trapezoidal or square threads. It is outside this steel comparison. See IS 4270 casing for the steel product and IS 12818 for the plastic family.
Who should order threaded casing and who should order bevel end
Select T&C, flush-joint or bevel ends from the approved well design and installation method. Record the thread form or weld procedure, joint inspection plan, handling length and coating-repair responsibility in the RFQ; do not mix end finishes without an engineered transition.
For a Kanpur RFQ, state how the approved design expects each joint to be made and inspected. T&C, flush-joint and bevel-end systems impose different tooling, clearance, joining, traceability and coating-repair requirements; the contractor’s familiarity does not replace the design decision.
Hydraulic shops and printing-cylinder buyers should not read this page as a precision-tube end-finish guide. Fire-system installers should stay on the fire-pipe pages, not on borewell threads. Process-water wells likewise need an end finish selected by the project designer rather than a trade default.
Flush-joint casing has no external coupling step, but that feature alone does not make it suitable for a borehole. Confirm the approved joint type, thread form, connection dimensions, make-up method and inspection evidence before accepting a Kanpur quotation.
Threaded versus bevel-end comparison for a Kanpur buyer
Compare installed cost and joint control, not only the pipe rate. T&C adds machining and couplings. Bevel end adds welder time, power, inspection and coating repair. As-of date 2026-05-06 for the site figures used below.
GST is extra at the legally applicable GST rate stated on the current quotation on either finish. Quotes are ex-warehouse Kanpur. A lower bevel rate per metre excludes field welding, inspection and coating repair.
Send the finish you actually want on the RFQ. Changing from bevel to T&C after the mill has cut ends wastes length. See Kanpur borewell pipes and confirm thread options on the written quotation.
| Attribute | Threaded and coupled | Bevel end | Unit / basis |
|---|---|---|---|
| Joint made by | Coupling and wrenches | Field butt weld | Site method |
| IS 4270 joint name | Screwed and socketed or screwed flush | Plain bevelled for butt weld | Clause 1.1 |
| Bevel geometry if used | Not applicable | 30° both ends or 45° ± 2.5° one end; root 1.6 ± 0.8 mm | Clause 9 |
| Fitment clearance | Check actual coupling OD against drilled-hole and pump clearance | Check alignment and finished weld profile | Verified offered dimensions |
| GST | Legally applicable rate stated on the current quotation | Legally applicable rate stated on the current quotation | Ex-warehouse Kanpur |
Dispatch from Kanpur for threaded and bevel-end casing
A crushed male thread stops a T&C job. A crushed bevel land stops a weld. Ask the loader to keep protectors on until the rig. City drops to Panki, Dada Nagar, Jajmau, Chakeri and Fazalganj are planned only when the written quotation confirms stock, vehicle and unloading window. Lucknow is 80 km on NH-27. Unnao is 18 km.
Ask the written quotation to state whether an MTC will travel with the offered steel lot and which inspection-document type applies. TPI can watch thread gauges or bevel angle on the yard floor when a PWD or JJM tender names it. Cut-to-length helps when the mast cannot handle 6 m.
City pages for Kanpur, Lucknow and the other North India routes use this same ex-warehouse basis. Do not assume a bevel-end leftover can be re-threaded on site without losing wall.
Which end finish is safer for borewell casing fitment on site?
Neither end finish is universally safer. The designer should select the joint system after considering loads, annular clearance, installation equipment, joining competence, inspection access, corrosion protection and the applicable casing standard.
A threaded IS 4270 casing length arrives with a connection that must be checked against the specified thread and coupling. With bevel end, the site creates the final joint under an approved welding and inspection procedure. Price both systems with their complete installation and inspection scope.
Site conditions affect both routes. Welding requires controlled preparation, alignment, safe working conditions, inspection and coating repair. Threaded installation requires clean compatible threads, protection, correct make-up, alignment and acceptance criteria. The project team should decide which controls it can reliably execute.
CGWB construction guidance does not create a universal preference between these end finishes. Preserve the approved casing, screen, annular-work, joint, inspection and installation sequence in the purchase order.
Do threaded borewell joints leak more or less than welded bevel-end joints?
Leak resistance depends on the specified connection, compatible components, workmanship, inspection and installation records. A threaded or welded joint can be unacceptable when its dimensions, preparation, make-up, welding or coating repair do not meet the approved procedure.
A joint-integrity concern can include leakage or unintended entry of water and formation material. For welded joints, define alignment, weld acceptance, inspection and coating restoration. For threaded joints, define connection compatibility, engagement, make-up, sealing and inspection. Do not infer performance from the finish name alone.
Threaded joints concentrate control at the supplier: thread profile, coupling length, end squareness and protector condition can be inspected before dispatch. On site, the crew must still tighten correctly. Over-torque can deform threads; under-torque leaves gaps. For slotted sections, keep slots away from the joint shoulder to avoid a weak leakage path.
Where corrosion protection is required, the design should cover cut edges, heat-affected areas, threads, crevices, compatible repair materials and inspection. The right connection depends on the complete approved system and the controls available during installation.
How should cost be compared between threaded and bevel-end borewell pipe?
Compare total installed scope, not pipe rate alone. A T&C quotation should include the specified couplings and connection inspection; a bevel-end plan should include welding, inspection and coating repair. Obtain project-specific quotations instead of assuming either route is cheaper or faster.
Threaded-and-coupled pipe carries an obvious upfront premium: machining time, coupling material, thread protection and sometimes additional inspection. Bevel-end pipe can be quoted lower because the supplier has less finishing work. That comparison is incomplete unless the buyer adds site welding cost, generator availability, welder mobilisation, grinding, coating repair and lost rig time.
Installation time and equipment use belong in the comparison, but neither can be predicted safely from the end finish alone. Ask the installer to price handling, joining, inspection, repairs, delays and rejected pieces against the approved method and site sequence.
A project may select bevel ends, T&C or flush joints for reasons documented by its designer and installer. Compare like-for-like accepted systems. IS 12818 uPVC pipe is outside this steel end-finish comparison and requires its own approved class, socket or thread and manufacturer instructions.
What should be inspected before accepting threaded or bevel-end borewell pipes?
For threaded pipe, inspect the specified thread form, coupling compatibility, protector condition and make-up criteria. For bevel-end pipe, inspect the drawing dimensions and the approved welding procedure inputs. Apply the purchase order’s dimensional, material, coating, document and traceability checks to either option.
A threaded shipment should match the purchase order’s coupling quantity and connection specification. Use the approved inspection plan for trial fit, thread condition, make-up criteria and protectors; do not assume a coupling-per-piece packing rule unless the ordered assembly requires it.
For bevel-end pipe, the bevel is only the starting point. Check angle, land, end squareness and ovality because poor geometry makes a poor weld likely. If the pipe is coated, ask how the heat-affected zone will be repaired after welding. The purchase order should assign responsibility for weld procedure, welder qualification and inspection; otherwise every party can blame the next one.
Both end finishes need the same base controls: OD, wall thickness, length, straightness, heat number and MTC. The end finish does not replace IS 4270 compliance, nor does it solve a bad well design. It simply defines how each length becomes a continuous casing string.
Worked example: joint count on an 80 m Kanpur farm string
Eighty metres in 3 m lengths need 27 pieces and 26 made-up joints. The same 80 m in 6 m lengths need 14 pieces and 13 joints. T&C spends that count on couplings. Bevel end spends it on field welds.
If an approved design uses 3 m handling lengths, an 80 m string would require 27 lengths before allowances; a 6 m plan would require 14. That arithmetic helps estimate joint count, but it is not a recommendation: the designer and installer must account for screen sections, sumps, overlaps, wastage, lifting capacity and the chosen connection.
Mass is independent of end finish. Using the site 150 NB heavy-duty row, 168.3 mm OD and 5.4 mm wall: (168.3 − 5.4) × 5.4 × 0.02466 = 21.69 kg/m. Eighty metres of body steel are 1.7352 MT. T&C couplings add extra kilograms that bevel end does not invoice the same way.
A welded-string plan should identify alignment, weld preparation, inspection and coating repair at each field joint. A threaded-string plan should identify connection compatibility, make-up criteria and thread protection. Compare the complete approved installation plan, not only the line-item pipe price.
Common end-finish mistakes in borewell procurement
Common procurement nonconformities include missing ordered connection parts, mixed thread forms, damaged ends and bevel geometry that does not match the purchase order. Record the observation, quarantine affected pieces and obtain qualified disposition rather than diagnosing later well behaviour from appearance alone.
A T&C quote should state the coupling quantity required by the string schedule. Count ordered components before dispatch and record the agreed protection and packing scope on the quotation.
A bevel quote should state 30° both ends or 45° ± 2.5° one end, with root face 1.6 ± 0.8 mm. A random torch cut is not clause 9. Oval ends make a poor root. Assign WPS and welder responsibility on the PO or every party will blame the next.
Do not cut threads off a T&C length to convert it to bevel unless the remaining wall and length still meet the well design. Do not run uPVC sockets on a steel thread. Keep IS 12818 and IS 4270 on separate lines.
Standards that decide the end finish
Cite IS 4270:2001 clause 1.1 for joint type and clause 9 for bevel or screw geometry. Cite hydrotest clause 8 on the same PO. uPVC joints stay under IS 12818:2010.
Clause 8 hydrotest is calculated, capped at 7 MPa, held at least 3 seconds, with no leakage. End finish does not waive that test. Fe 410 uses 280 × t / D N/mm²; Fe 450 uses 350 × t / D, both capped at 7 MPa.
IS 4270 distinguishes screwed and flush-joint connection details. They are not interchangeable, so the RFQ and joint schedule should name the exact connection and any engineered transition. Well construction and development remain separate design and execution responsibilities.
Jal Jeevan Mission tenders that name steel casing should still pick a joint type. A tap-connection target does not choose T&C or bevel for you. Put the finish on the BOQ and on the Kanpur RFQ.
Key points for threaded versus bevel-end casing
- IS 4270:2001 allows screwed-and-socketed, screwed flush and plain bevelled ends.
- Select T&C, flush-joint or bevel ends only from the approved design and installation plan.
- Bevel geometry is 30° both ends or 45° ± 2.5° one end, root face 1.6 ± 0.8 mm.
- Eighty metres in 3 m lengths create 26 joints; 6 m lengths create 13 joints.
- Quotes stay ex-warehouse Kanpur with GST at the legally applicable GST rate stated on the current quotation on either finish.