CNC tube sheet drilling services and tube sheet drilling job work for heat exchanger, condenser and process equipment buyers who need pattern accuracy, drawing-led machining and a clear RFQ path.
NPRO India manufactures tube sheets in Mumbai for EPC, OEM and industrial buyers across India and export markets. This page is for commercial drilling intent — when you need CNC tube sheet drilling or tube sheet drilling job work executed to your pattern, pitch and acceptance criteria.
When evaluating tube sheet drilling services, buyers typically weigh drawing review, hole-table / pattern interpretation, material and thickness, joint-method requirements where applicable, pitch, acceptance criteria, inspection and documentation. Share that package for a manufacturability review before a commercial offer is locked.
For how the process works in educational detail, see the article CNC tube sheet drilling: process, accuracy & hole patterns. For finished product classifications, see CNC machined tube sheets and drilled tube sheets.
Share the released drawing revision, material and inspection notes for a manufacturability review before quoting.
Tube sheet drilling is the machining of the full tube hole pattern in a heat exchanger or condenser tube sheet so tubes can be expanded or welded to drawing.
On a commercial RFQ, “drilling” usually includes locating every hole from agreed datums, controlling diameter for tube fit-up, maintaining pitch across the pattern, and leaving a bore condition suitable for the joint method. CNC control is used when positional consistency across high hole counts, clad constructions or tight joint designs matters.
CNC tube sheet drilling means the pattern is programme-controlled rather than relying on purely conventional layout. Capability for a specific diameter, thickness and alloy is confirmed against your drawing during enquiry — we do not publish unverified machine travel or spindle claims on this page.
Aligned with the production sequence described on our manufacturing page.
| 01 — Drawing review | Pattern, pitch, hole table, clad notes, joint method and inspection pack checked before programming |
| 02 — Material readiness | Certified plate or forging released; cladding completed first when specified |
| 03 — Facing / prep | Blank prepared so thickness and face condition match the drilling plan |
| 04 — CNC drilling & related features | Hole pattern machined to the released coordinates; grooves where the joint design requires them |
| 05 — Heat treatment (as required) | Stress relief or solution anneal per material and order scope |
| 06 — Finish & inspection | Final machining as specified, dimensional checks and documentation package |
Pattern choice is a design decision. The shop drills what the approved drawing specifies.
Most commercial drilling RFQs are for shell-and-tube heat exchanger and condenser tube sheets.
Heat exchanger tube sheet drilling sits at the intersection of thermal design and shop execution. Ligament geometry, tube count and pass arrangement come from the exchanger design; drilling quality decides whether tubes enter cleanly and joints seal as intended. The same drawing-led approach applies to condenser tube sheet drilling and related shell-and-tube duties.
Buyers typically need: TEMA-aligned layouts where specified, ASME Section VIII awareness on pressure parts, material families matched to process fluid, and inspection records that travel with the blank. Product context: heat exchanger tube sheets. Process education (informational, not a sales duplicate): how CNC drilling works.
Requirements are reviewed against the submitted drawing. Share tube OD, pitch, layout, hole diameter/tolerance, material, thickness, quantity and any clad notes with your RFQ so manufacturability can be confirmed before a commercial offer is locked.
A separate heat-exchanger-only drilling URL is not published at this stage — this section addresses that commercial intent until Search Console shows clearly independent demand.
CNC drilling and machining can start from the customer's drawing and material specification — including grade, UNS and applicable ASTM/ASME material references where provided.
An RFQ that arrives with SA-965 / F347 / UNS S34700 (or another verified material callout) is usable when the drawing also freezes pattern, hole size, thickness and inspection. Material identity alone does not define the hole pattern; the drawing does.
This page covers CNC drilling and job-work machining. It does not replace grade datasheets or the manufacturer supply page.
Drawing-led CNC drilling is commonly requested for shell-and-tube heat exchangers, condensers and related process equipment tube sheets.
Procurement and engineering teams use this service when the hole pattern must follow a released layout rather than a generic catalogue pitch. Related product pages help freeze structural type and application before machining begins: heat exchanger tube sheets, CNC machined tube sheets and precision machined tube sheets.
Any structural type can be drilled; material and thickness drive tooling and cycle strategy.
Including 304/304L and 316/316L families for general and chloride-aware service
Work-hardening grades that need controlled feeds and inspection attention
Plate and forged carbon blanks when the drawing freezes form and grade
Grade 2 / Grade 5 tube sheets where seawater or weight-driven duty applies
Nickel alloys, copper-nickel, alloy steels and the full materials index
A drilled tube sheet is finished when inspection matches the purchase order. Typical checks include diameter sampling, pitch/position checks on critical zones, visual review for tear-out or clad discontinuity at hole walls, cleaning verification, and linkage to mill certificates. See testing & quality.
Governing references commonly cited on RFQs include TEMA tolerance practice and ASME Section VIII design notes — confirm the codes that apply to your project on standards. Production runs under NPRO India’s ISO 9001 quality management system.
| RFQ must state | Drawing revision, pattern/pitch, hole diameter & tolerance, material, cladding, joint method, inspection extent |
| Helpful extras | CAD coordinates, hold points, packing/export notes, delivery destination |
| Common delays | Vague grade, missing joint method, no code class — see RFQ mistakes |
This is the full checklist for CNC tube sheet drilling RFQs. Completing the list does not guarantee acceptance — each package is reviewed against the released drawing and stated codes before a quote is issued.
Related reading: TEMA tolerance reference, baffled tube sheets, and RFQ mistakes. For custom supply rather than drilling job work, see tube sheet manufacturer in India.
Product classification for CNC-controlled hole patterns
Conventional drilling classification for appropriate joint designs
When shell-side flow features pair with the drilled pattern
When the blank is a forging rather than plate
Layout and tolerance practice cited on drilling RFQs
Commercial overview of tube sheet supply
Manufacturer-intent landing for sourcing from India
What to freeze before your first order
Yes. Send the released drawing, material grade and inspection expectations through the enquiry form. We review manufacturability, then quote CNC tube sheet drilling or related machining scope against that package.
This page is the commercial service / job-work landing for drilling intent. The CNC machined tube sheets page describes the finished product classification. Use both when you need service clarity plus product context.
Clad constructions are drilled after cladding when specified, so holes pass through base and clad layers as a unit. State clad alloy, thickness and which face is clad on the RFQ so procedures and inspection can be planned.
Tolerances are project-specific and must come from your drawing, client specification or agreed TEMA/ASME practice. We do not publish a single universal hole-diameter or positional figure for every exchanger on this page.
Include the released drawing revision, pattern/pitch notes, finished hole diameter and tolerance, material grade and thickness, cladding details if any, joint method, quantity, inspection expectations and delivery destination. Share the package through the enquiry form for a manufacturability review.
NPRO India is based in Mumbai, Maharashtra, India, and supplies domestic and export buyers. Contact sales@nproindia.in or +91 9594639793.
Every drilling enquiry is checked for pattern feasibility, material fit and documentation scope before a commercial offer is locked. That is the same engineering-led approach described across our manufacturing and about pages.
CNC tube sheet drilling and tube sheet drilling job work are available for domestic and export RFQs, including packages destined for the United States, the UAE and Saudi Arabia. See also export markets.
Share your drawing revision, material grade, pattern notes and delivery destination for a reviewed quote.