Ex-stock Mumbai · Pan-India Delivery
Specialty Precision Parts — Mumbai Manufacturer & Supplier
Die punches, ejector pins, door arm clips, plunger bolts, blue-tempered spring steel rod, and ISO 10243 die springs for tooling, moulding, and precision engineering applications. HSS M2/M35 and DIN 1530 grades. Custom profiles available. Pan-India delivery since 1971.
HSS M2 • HSS M35 • Ø1 – Ø50
Die Punch
Ex-stock Mumbai · Custom sizes: 5–7 days
Die punches are hardened and tempered high-speed steel punches used in press tools to blank, pierce, or form sheet metal. We supply circular punches in standard diameters as well as custom-profile punches (square, hexagonal, oblong, shaped) ground to drawing. HSS M2 is the standard grade for mild steel and aluminium. HSS M35 (5% Cobalt) is recommended for stainless steel, high-tensile steel, and any application requiring superior hot hardness and wear life.
| Material | HSS M2 (standard), HSS M35 (cobalt) |
|---|---|
| Diameter Range | Ø1 mm – Ø50 mm (circular) |
| Custom Profiles | Square, hex, oblong, shaped — to drawing |
| Hardness | M2: 62–64 HRC; M35: 63–65 HRC |
| Finish | Ground & polished tip |
| Head Style | Plain / Flanged / Shouldered |
Common Applications
- Sheet Metal Blanking
- Piercing & Perforating
- Progressive Dies
- Stamping Tools
- Aerospace Tooling
DIN 1530 • Ø1 – Ø25
Ejector Pin
Ex-stock Mumbai · Custom sizes: 5–7 days
Ejector pins (knockout pins) are precision-ground, hardened pins used in injection moulds and die casting moulds to push the solidified component from the cavity after each cycle. DIN 1530 specifies straight cylindrical ejector pins with a ground body toleranced to h6/h7 and a hardened shank. The highly polished surface minimises gate marks on the moulded part and ensures smooth operation for millions of cycles without galling against the mould plate bore.
| Standards | DIN 1530 |
|---|---|
| Material | Tool Steel (1.2344 / H13), HSS M2 |
| Diameter Range | Ø1 mm – Ø25 mm |
| Length Range | 40 mm – 500 mm |
| Tolerance | h6 (body) |
| Hardness | 50–55 HRC (body) |
| Finish | Ground & polished |
Common Applications
- Injection Moulds
- Die Casting Moulds
- Rubber Moulds
- Compression Moulds
- Blow Moulding Tools
Custom • M4 – M16
Door Arm Clip
Ex-stock Mumbai · Custom sizes: 5–7 days
Door arm clips are precision-stamped or machined retaining clips used to secure door check arms, hood struts, and similar linkages in automotive, bus, and rail coach bodies. They provide a secure yet releasable connection that withstands repeated actuation cycles and vibration. Available in carbon steel and stainless steel, with zinc-plated or black oxide finish for corrosion resistance.
| Type | Custom stamped / machined retaining clip |
|---|---|
| Material | Carbon Steel, SS 304 |
| Thread / Pin Size | M4 – M16 |
| Finish | Zinc plated, Black oxide, Self-colour |
| Custom | Available to drawing / sample |
Common Applications
- Automotive Door Checks
- Bus & Coach Bodies
- Rail Carriage Doors
- Hood & Bonnet Struts
- Industrial Panel Linkages
DIN 6332 • M4 – M20
Plunger Bolt
Ex-stock Mumbai · Custom sizes: 5–7 days
Plunger bolts (spring plungers or index plungers) contain a spring-loaded tip — ball or pin — that snaps into a recess or dimple to provide a positive detent or index position. When force is applied, the plunger retracts to allow movement to the next position. They are essential in jigs and fixtures for repeatable workpiece location, in tool holders, and on production lines for indexing carriages and pallets. Available in hex body (DIN 6332) for wrench adjustment and knurled body for hand adjustment.
| Standards | DIN 6332 |
|---|---|
| Material | Carbon Steel, SS 303 |
| Thread Range | M4 – M20 |
| Tip Type | Ball / Pin |
| Body Style | Hex (DIN 6332) / Knurled (hand-adjust) |
| Locking | Standard / Locking-type (with lock nut) |
Common Applications
- Jig & Fixture Locating
- Tool Holder Index
- Production Line Indexing
- Pallet Carriers
- Assembly Fixtures
Blue-Tempered Spring Steel • 4½″ • Ø0.6 – Ø8.0
Blue Rod (Spring Steel Wire)
Ex-stock Mumbai · Sold per dozen
Blue Rod is blue-tempered high-carbon spring steel wire supplied in straight, pre-cut 4½ inch (≈114 mm) lengths across diameters from Ø0.6 mm to Ø8.0 mm, held to ±0.2 mm. The characteristic deep-blue finish is the oxide film formed when high-carbon spring steel is hardened and tempered — it indicates the spring temper and lends a degree of corrosion resistance. Because the wire is already tempered to spring hardness, components formed from it need no further heat treatment, eliminating the distortion that annealed stock would suffer. Supplied straightened and cut to a uniform length, Blue Rod is ready raw stock for fabricating springs, spring clips, retaining clips, and small formed-wire components.
| Material | High-Carbon Blue-Tempered Spring Steel |
|---|---|
| Form | Straightened & cut wire lengths |
| Length | 4½″ (≈114 mm) |
| Diameter Range | Ø0.6 mm – Ø8.0 mm |
| Tolerance | ±0.2 mm |
| Finish | Blue-tempered (blued) |
| Supplied | Per dozen |
Common Applications
- Compression & Extension Springs
- Spring Clips & Retaining Clips
- Formed Wire Components
- Hand Tool & Blade Stock
- General Fabrication Stock
Colour-Coded Load • OD 10 – Ø63
Die Springs (Rectangular-Wire)
Ex-stock Mumbai · Sold per piece
Die springs are heavy-duty compression springs wound from rectangular-section wire, which packs far more load into a given bore than a round-wire spring of the same size. They follow the ISO 10243 colour-coding system, where the coating colour signals the load rating — green (lightest), blue (light), red (medium) and yellow (heavy) — so the correct load can be chosen at a glance and dropped straight into a standard housing bore. Manufactured from chrome-silicon alloy spring steel, pre-set and shot-peened for long fatigue life, they are the workhorse spring of press tools, dies, and moulds where high force is needed in a confined space.
| Type | Rectangular-wire compression spring |
|---|---|
| Colour Code | Green · Blue · Red · Yellow (lightest → heavy) |
| Standard | ISO 10243 colour coding |
| OD Range | OD 10 mm – Ø63 mm |
| Free Length | 25 mm – 305 mm |
| Material | Chrome-Silicon Alloy Spring Steel |
| Supplied | Per piece |
Common Applications
- Press Tools & Stamping Dies
- Injection & Die-Casting Moulds
- Clamping & Holding Fixtures
- Valves & Clutches
- General High-Load Compression
Common Questions
Specialty Parts FAQ
What is the difference between HSS M2 and HSS M35 die punches?
HSS M2 is the standard grade for punching mild steel and aluminium, offering good hardness and wear resistance. HSS M35 (5% Cobalt) has superior hot hardness and wear resistance — the right choice for punching stainless steel, high-tensile steel, and heat-treated materials where M2 wears too quickly.
What is an ejector pin and where is it used?
An ejector pin is a precision-ground, hardened pin used in injection moulds and die casting moulds to push the solidified part out of the cavity after each cycle. They must be dimensionally precise and highly polished to prevent surface marks on the moulded part and to operate reliably for millions of cycles.
Can you supply custom die punches to drawing?
Yes. We supply circular die punches from Ø1mm to Ø50mm as standard, and custom profiles (square, hexagonal, oblong, shaped) to customer drawings. Please share your drawing and material requirement for pricing and lead time.
What is a plunger bolt used for?
A plunger bolt (spring plunger) provides a positive detent or index position using a spring-loaded ball or pin tip. Used in jigs and fixtures for repeatable workpiece location, in tool holders to engage locking positions, and on production lines for indexing carriages and pallets.
Do you supply ejector pins in non-standard lengths?
Yes. Ejector pins can be supplied in non-standard lengths to match your mould plate stack-up. Specify the body diameter, total length, and head style and we will confirm availability and lead time.
What is Blue Rod and what is it used for?
Blue Rod is blue-tempered high-carbon spring steel wire supplied in straight, pre-cut 4½″ (≈114 mm) lengths, in diameters from Ø0.6 mm to Ø8.0 mm (±0.2 mm), sold per dozen. Because the wire is already tempered to spring hardness, parts formed from it need no further heat treatment. It is used as raw stock for springs, spring clips, retaining clips, and formed wire components.
What do the die spring colours mean?
Die springs are colour-coded by load rating: green is the lightest load, then blue (light), red (medium), and yellow (heavy). Springs of the same outer diameter and length share the same housing bore, so the colour lets you select or swap the load rating without changing the machined pocket. This follows the ISO 10243 colour-coding convention for rectangular-wire die springs.
What sizes of die springs do you stock?
We stock colour-coded die springs in outer diameters OD 10, 13, 16, 20, 25, 32, 40, 50 and 63 mm, with free lengths from 25 mm to 305 mm, each available in all four load ratings (green, blue, red, yellow). Sold per piece — see the Die Springs tab in our pricelist for the full size and rate matrix.
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