Quick Answer
A custom sheet metal box is any made-to-drawing metal enclosure, housing, cabinet, cover, tray, bracket or chassis — manufactured from CRCA, galvanized steel, stainless steel, or aluminum — without the constraints of a catalog product. KM Engineering takes 2D/3D drawings and delivers prototype parts in 10–15 days using fiber-laser cutting, CNC press-brake bending, TIG/MIG welding, and 7-tank pre-treatment powder coating, with an MOQ of 1 unit for prototypes.
What Is Custom Sheet Metal Boxes?
Custom sheet metal boxes are made-to-drawing metal enclosures fabricated for a specific application where no catalog product fits. They can be structural (machine base, skid, frame), protective (cover, guard, enclosure), functional (hopper, chute, manifold, tank), or cosmetic (branded display housing). The defining characteristic is that the part is engineered for one customer's exact drawing rather than produced as a standardized item.
KM Engineering's custom sheet metal fabrication service accepts inputs in any common drawing format — 2D drawings (PDF, DWG, DXF), 3D models (STEP, IGES, STL), even hand-sketched drawings for rapid prototype estimation. We work with CRCA, HR, galvanized (GI), galvanneal (GA), stainless steel (SS 304, SS 316, SS 430), and aluminum (5052, 6061) from 0.5 mm to 6 mm thickness on our fiber-laser, plus thicker plate work on plasma or waterjet partner cut.
Typical custom sheet metal jobs we fabricate: EV and electronics enclosures, machine covers and panels, industrial trays and bins, ventilation ducts and hoods, kitchen and lab equipment cabinets, food-processing trolleys and racks, fabrication subassemblies for OEMs, architectural and signage metalwork, and low-volume prototype parts for hardware startups. MOQ starts at 1 unit for prototypes; pricing tiers at 5, 25, 100, 500 units.
Detailed Specifications
Full technical specifications for Custom Sheet Metal Boxes — material grades, tolerances, process capabilities, and standards compliance.
| Specification | Value / Description |
|---|---|
| Drawing Formats Accepted | PDF, DWG, DXF, STEP, IGES, STL, hand sketch (for estimation) |
| DFM Turnaround | 48–72 hours for most parts |
| Cutting — Fiber Laser | 4 kW, bed 3000×1500 mm, sheet thickness 0.5–6 mm |
| Cutting — Plasma / Waterjet | Partner-sourced for plate > 6 mm and non-metal composites |
| Cutting Tolerance (laser) | ± 0.1 mm parts ≤ 500 mm; ± 0.15 mm up to 1500 mm |
| Bending | CNC press-brake with custom tooling; ± 0.5° angular |
| Forming | Roll-forming (partner), deep drawing (partner) for production volumes |
| Welding — TIG | Stainless, aluminum, thin-gauge (0.8 mm+) applications |
| Welding — MIG | CRCA, GI structural joints; higher productivity |
| Welding — Spot / Stitch | High-volume cosmetic assemblies |
| Deburring / Finishing | Mechanical deburr, abrasive belt, vibratory polish, manual grind |
| Surface Pre-Treatment | 7-tank phosphating (CRCA/GI); pickling-passivation (SS) |
| Powder Coating | Epoxy-polyester, 60–80 µm, any RAL |
| Wet Paint (option) | 2K polyurethane, epoxy primer + topcoat |
| Plating (partner) | Zinc, nickel, chrome, hot-dip galvanizing |
| Stainless Polish (in-house) | #4 brushed, #2B mill; mirror polish on request |
| Anodizing (partner) | Type II (sulfuric) for aluminum |
Manufacturing Process
How KM Engineering fabricates Custom Sheet Metal Boxes — step-by-step process from drawing review to dispatch.
Drawing Intake & Quotation
Share drawings via email or WhatsApp. Quote issued within 24–48 hours for standard parts; same-day for simple brackets and covers.
DFM Review
Review for bend reliefs, weld access, minimum hole spacing, radius minimums, and tooling feasibility. DFM feedback returned with quote.
Material Procurement
Standard CRCA, GI, SS, and aluminum maintained in stock for common thicknesses. Unusual grades or oversized sheets procured on order (2–5 days).
Laser Cutting
Parts nested for utilization and cut on fiber-laser. Each part tagged with batch ID for traceability.
Bending & Forming
CNC press-brake bending per drawing. Tooling changeover is fast on our facility — small lot-size work well-supported.
Welding (if required)
TIG, MIG, or spot welding per drawing. Welded assemblies held in jigs for dimensional consistency.
Finishing & Coating
Deburring, pre-treatment, powder coat, paint, or polish as specified.
QC Inspection
Dimensional check against drawing; visual inspection; coating thickness if applicable.
Packaging & Dispatch
Individual parts wrapped and carton-packed; large assemblies palletized. Same-day dispatch available for completed orders with customer pickup or courier arrangement.
Request a Quote for Custom Sheet Metal Boxes
Share your drawings or requirements — we respond within 24 hours with a DFM review and priced offer.
Standards & Compliance
KM Engineering manufactures Custom Sheet Metal Boxes in alignment with the following Indian and international standards:
- IS 513 — CRCA steel grade
- IS 277 — Galvanized sheet grade
- IS 6911 — Stainless steel grade
- IS 737 / IS 733 — Aluminum sheet grade
- ASTM D3359 — Coating adhesion
- ISO 9001:2015 — QMS alignment
Industries & Applications
Custom Sheet Metal Boxes by KM Engineering is used across multiple Indian industries. Below are typical buyers, their applications, and why they choose us:
Hardware Startups & Prototyping
Application: Prototype enclosures, mounting brackets, mechanical assemblies for early-stage product development
Why KM: 1-unit MOQ; drawing-to-part in 10 days; iterative revision-friendly workflow
Electronics & Electrical
Application: Transformer enclosures, power-supply housings, light-fixture bodies, PCB mounting frames
Why KM: High-mix low-volume production; tight cutout tolerance for connector interfaces
Architecture & Interior
Application: Custom facade panels, signage housings, decorative metalwork, lighting fixtures
Why KM: Cosmetic-grade finish; SS #4 brushed or powder-coat textured; any RAL color match
Machine Builder Subcontract
Application: Sheet metal subassemblies for OEM machine builders — covers, guards, brackets, mounting plates
Why KM: Drop-in outsourced fabrication; OEM branding applied; PPAP documentation available
Food & Kitchen Equipment
Application: Custom commercial kitchen housings, trolleys, bins, exhaust hoods
Why KM: SS 304 food-grade; TIG-welded hygienic corners; #4 brushed finish; cleanable geometry
Small-Batch Production Runs
Application: Short production runs (25–500 units) not viable for dedicated tooling investment
Why KM: Laser + CNC brake economics make 25–500 unit batches cost-effective vs hard-tooled alternatives
Import Replacement
Application: Local substitutes for imported custom enclosures, brackets, or specialty parts
Why KM: 40–60% cost reduction vs imported equivalents; faster lead time; local quality support
Customization Options
Every Custom Sheet Metal Boxes we fabricate is made to the customer's drawing or specification. Customizable aspects include:
- Material — any sheet metal grade from 0.5 mm to 6 mm
- Finish — powder coat, wet paint, anodizing, plating, polish, bare
- Hardware — PEM studs, weld-nuts, rivets, hinges, handles, latches
- Assembly — bolted, welded, riveted, or kit-form for customer assembly
- Branding — silkscreen, pad-print, laser etch, riveted nameplate
- Packaging — individual bagging, foam-lined carton, pallet, bulk-pack
- Documentation — drawing conformity, material TC, coating report, FAI
Quality Assurance & Testing
Each Custom Sheet Metal Boxes undergoes the following QC steps as part of our ISO 9001:2015-aligned quality system:
- Dimensional check against drawing — sampling basis for standard parts, 100% for critical
- FAI dimensional report on first-article batches
- Material TC verification per heat lot (on request)
- Coating thickness per batch
- Visual QC 100% before dispatch
How We Compare
Here is how KM Engineering's Custom Sheet Metal Boxes compares against alternative supplier options available to Indian buyers:
| Criterion | KM Engineering | Catalog Enclosure Brand | Local Unorganized Fabricator |
|---|---|---|---|
| MOQ | 1 unit (prototype) | 100+ units | 1–10 units |
| Lead Time | 10–15 days | 3–5 days (catalog) | 15–20 days |
| Cost — sample 1-off | INR 800–4500 | N/A (no MOQ) | INR 1500–6000 |
| Quality Documentation | TC + coating + FAI | Standard datasheet | Minimal |
| Drawing Revision Support | Full — free minor changes | Fixed catalog | Limited |
| Finishing Options | Full in-house + partner | Catalog finishes | Bare only |
Ordering & Lead Time
Frequently Asked Questions
Can you fabricate a single unit without a minimum order?
Yes. Our MOQ for custom prototype parts is 1 unit. This is a key differentiator for startups, R&D teams, and machine builders who need one or a handful of parts. Volume pricing tiers start at 5 units; 25+ units get significant per-part cost reduction.
What drawing formats do you accept?
Any common format: 2D — PDF, DWG, DXF, JPG (for hand sketches during estimation). 3D — STEP, IGES, STL, Parasolid, SolidWorks/Inventor/CATIA native (for final production). Rough hand sketches are acceptable for budget estimation; for production we need a dimensioned 2D drawing or 3D model.
How fast can you turn around a prototype?
For simple parts (single-bend brackets, basic covers): 5–7 days. Standard custom boxes with welding and powder coat: 10–12 days. Complex assemblies with multiple components: 15–18 days. Expedited service (premium rate) can compress by 30–40% for truly urgent parts.
Do you work with SS 304/316 or only painted steel?
All material grades: CRCA, GI, SS 304, SS 316, SS 430, aluminum 5052/6061, and MS HR plate up to 6 mm on our laser, thicker via partnered plasma/waterjet. For food/pharma work SS 304 or SS 316 is most common; for electrical enclosures CRCA with powder coat is standard; for outdoor architectural work SS 304 with #4 finish or aluminum with anodizing is preferred.
What thickness range can you handle?
In-house fiber-laser: 0.5 mm to 6 mm on CRCA, GI, aluminum; up to 4 mm on SS. For thicker plate (6–20 mm structural plate, heavy brackets, base plates), we partner with plasma and waterjet cutting shops. Partner cut adds 2–5 days to lead time but gives seamless single-supplier service.
Can I revise the drawing during prototyping?
Minor drawing changes during prototyping are supported at no additional cost (typical threshold: changes to < 10% of features). Major geometry changes may require partial re-quote. We maintain revision control via ECN — production always matches the latest drawing revision.
What about hardware insertion — PEM studs, weld-nuts, rivnuts?
All standard hardware insertion types supported: PEM self-clinching studs and nuts, weld-nuts, rivnuts (rivet-nuts), snap-in studs, and press-in bushings. Specify on the drawing and we source or kit the hardware per your BOM.
Do you do polished stainless steel finish?
Yes. #4 brushed (standard industrial SS finish), #2B mill (unpolished, common for raw SS), and mirror polish (#8, via partner). #4 brushed is done in-house; mirror polish is partnered.
What's your typical price range?
Varies widely with size, material, and finish. Small brackets and covers: INR 150–800 per part. Medium enclosures (300×300 mm class): INR 800–2500. Large cabinets (800×600 mm class): INR 2500–6500. Send your drawing for a specific quote — turnaround typically 24 hours.
Can you ship internationally?
Yes. Export documentation (invoice, packing list, certificate of origin, material TC) provided per destination requirement. FOB Mumbai or Delhi air/sea arranged with customer's freight forwarder; DDP delivery available for select countries.
Do you offer design service if I don't have drawings?
Yes. We offer basic mechanical design service for sheet-metal parts — for customers with a sketch, photo, or verbal description of what's needed. Design fee typically INR 2,000–10,000 per part depending on complexity, credited against production order.
What's your experience level as a fabricator?
Established in 2021 with a 50-strong team including 2 design engineers, 3 QC inspectors, 20 skilled fabricators, and 10 helpers. We ship to 25+ OEM clients across multiple industries and operate on an ISO 9001:2015-aligned quality system.
Related Products
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Ready to Source Custom Sheet Metal Boxes?
Share your drawings or requirements with KM Engineering. Our Faridabad team responds within 24 hours with a DFM review, lead time and priced offer.