SPTI · Stroke 001
We Build Quality.
Electrical lamination progressive dies engineered to ±0.005 mm — with in-die AutoStack, AutoSkew and AutoRotation, multi-row layouts and slinky EV stator tooling for motor makers across India.
Two decades of tooling, consolidated into one precision enterprise.
What began in 2007 as a tool-and-die unit is today a modern, innovation-led facility in Faridabad — building the progressive dies that stamp India's motor laminations.
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2007
Sai Engineering Works founded
Mr. Satbir Singh lays the foundation — a tool & die unit focused on high-quality progressive tooling, rooted in craftsmanship and customer trust.
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2014
Stampwell Pvt. Ltd. established
A parallel venture producing rotors and stators for clients including Autolek, BCH and Varroc — proving the tooling at production scale.
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2018
Consolidated as SPTI
Both ventures unite as Sai Precision Tool Industries, specialising in lamination progressive dies with AutoStack and AutoSkew technologies.
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Today
Modern, innovation-led tooling enterprise
A state-of-the-art facility with Japanese, Swiss and Italian machinery and a team dedicated to quality and customer satisfaction.
Growth trajectory
FY 2007–08 → FY 2024–25 · %To manufacture high-quality, precision-driven products while delivering exceptional after-sales service — creating lasting value for customers, employees, suppliers and the community.
Finished cores, straight out of the die.
Our lamination dies don't just blank parts — they interlock, skew, rotate and coil them in-tool, so customers receive assembly-ready stator and rotor stacks at press speed.
AutoStack
Each lamination is formed with interlock points and pressed onto the one below inside the die. A counting station separates stacks at the programmed height — producing rigid, ready cores without welding, cleating or riveting.
- Benefit
- No secondary stacking
- Proven on
- Ø130.45 stator · 0.9 mm sheet
AutoSkew
The rotor die indexes each lamination by a minute angle as it stacks, building the slot skew into the core itself. Skewed rotors reduce cogging torque, noise and harmonic losses — critical for quiet pumps, fans and EV drives.
- Benefit
- Lower noise & cogging
- Proven on
- EV motor · 0.25 mm sheet
AutoRotation
The stack is rotated between laminations so that natural variation in strip thickness cancels out around the circumference — giving parallel, square cores with uniform stack height and consistent magnetic performance.
- Benefit
- Uniform stack height
- Result
- Parallel, square cores
Slinky EV Stator
Instead of blanking full rings, the stator is stamped as a continuous toothed strip and wound helically into a core. Material utilisation rises dramatically on large-diameter stators — ideal for EV hub and traction motors.
- Benefit
- Far less scrap
- Tooling
- Incl. 4-cavity slinky dies
Multi-Row Layouts
1-, 2-, 3- and 4-row strip layouts nest multiple stator–rotor sets across the coil width, multiplying output per press stroke and squeezing scrap out of every metre of electrical steel.
- Configurations
- 1 · 2 · 3 · 4 Row
- Proven on
- Water pump · 3 Row
Progressive dies, built and proven in-house.
A selection of lamination and specialty dies from our shop — from single-row exhaust-fan tooling to 3-row AutoSkew dies and thin-gauge stainless gasket tools.
Every stroke, identical.
Raw electrical steel in, finished laminations out. Watch an SPTI progressive die running on the shop floor.
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Strip enters the die
Coil-fed electrical steel advances station by station with pilot-located accuracy.
Slots, bores & interlocks
Stator and rotor geometry is pierced and blanked — rotor inside stator — on every stroke.
Cores leave assembled
AutoStack and AutoSkew stations deliver counted, interlocked cores ready for winding.
Laminations for every motor we touch.
Stators and rotors for BLDC, induction and shaded-pole motors; slinky stators and hubs for EV; and specialised gasket and component tooling.
- Loading products…
Automotive — EV & ICE
Traction and hub-motor laminations, slinky stators and engine gasket tooling.
Domestic appliances
Coolers, water pumps, exhaust and ceiling fans — high-volume, multi-row dies.
Industrial electrical
Electric pump and general-purpose motor laminations for stamping houses.
Swiss, Japanese & Italian precision under one roof.
Every die is cut, ground, bored and tried-out in-house — from wire-EDM profiles to high-speed press validation.
Loading machine park…
Measured in microns. Certified by process.
Quality at SPTI is not an inspection step — it is the operating system. Every die moves through a documented, ISO 9001:2015 certified process from drawing to dispatch.
management system
Five microns — roughly 1/14th the thickness of a human hair — held on critical punch and die profiles.
Design & strip layout
Lamination geometry, row count and stacking scheme engineered around your drawing and volume.
Wire-cut & jig boring
Punch, die and stripper profiles cut on Sodick wire-EDM; plate bores located on SIP jig boring.
Precision grinding
Studer cylindrical and Minini/Favretto surface grinding to final tolerance and finish.
Assembly & alignment
Guided die sets assembled with ball-cage guide posts for repeatable, rigid alignment.
Press try-out
Every die proven on our Yadon high-speed presses before release.
Inspection & after-sales
Parts verified with calibrated metrology; ongoing support and maintenance after delivery.
Trusted by industry leaders nationwide.
From appliance majors to automotive tier-ones and specialist stamping houses — across Haryana, Gujarat, Rajasthan, Delhi NCR, Karnataka and beyond.
Full client index · 53 partners
Leadership
Our journey is rooted in innovation, craftsmanship and customer trust. We are committed to precision-driven products and exceptional service — creating lasting value for every partner we serve.Satbir SinghFounder & Managing Director
Start your die.
Share your lamination drawing and volumes. Our engineering team will review the strip layout, technology and timeline, and respond with a detailed quotation.
- ContactSatbir Singh, Managing Director
- Phone+91 99993 22666
+91 99993 22661 - Emailsaiprecision18@gmail.com
- WorksPlot 7, Rishal Industrial Complex,
Jeevan Nagar, Gaunchi, Faridabad,
Haryana 121005, India - DirectionsOpen in Google Maps ↗