Product Category 07

Machinery & Specialized Parts

Precision machining and specialised fabrication — aerospace components, CNC turned and milled parts, machinery spares and bridge deck drainage, made to drawing in CS, AS, SS and special metals.

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Machinery & Specialized Parts

CNC machined components and machinery parts made by Purohit Pipes Industries

4 Products in this range

Overview

Made to Drawing, Measured Before It Ships

This is the part of the works where the tolerance band is tight enough that the inspection plan is written before the first cut. CNC turning and milling, conventional lathe work, drilling, grinding, laser cutting and welding all sit under one roof, so a component moves between operations without leaving the building or losing its identity.

We work from a drawing, a 3D model, or a sample of the worn part — the last of these being the usual case for obsolete machinery spares, where no drawing has existed for twenty years. Reverse engineering, material identification and first-article inspection are all part of that route.

Capability: CNC, lathe, milling, drilling, grinding, laser cut, press, bending.
Tolerance: Down to ±0.02 mm on critical features.
Batch size: Single replacement part through to production runs.

Products in This Category

Four streams of precision work, each with its own inspection regime.

Aerospace Components

Brackets, bushes, spacers, fittings, housings and ground support hardware machined from aluminium, titanium, stainless and nickel alloys. Aerospace work is as much about the paperwork as the metal: raw material is released against its certificate, every operation is recorded on a route card, and each batch ships with a first-article report and full traceability back to the heat.

Materials: Al 6061 / 7075, Ti Gr 5, SS 15-5 PH, Inconel 718

Tolerance: ±0.02 mm on critical features

Surface Finish: Ra 0.8 µm and better

Documentation: Route card, FAI report, material traceability

CNC Components

Turned and milled parts produced to your model or drawing — shafts, flanged adaptors, manifolds, valve bodies, bushes, pins, nozzles and housings. Once a program is proven and the fixture exists, repeat batches come back identical, which is the whole reason to put a recurring part on CNC rather than a manual machine.

Turning: Up to 500 mm dia × 1500 mm length

Milling: Up to 1200 × 600 × 600 mm envelope

Materials: CS, alloy steel, SS, duplex, brass, aluminium, plastics

Input: 2D drawing, STEP / IGES model or physical sample

Machinery spare parts and wear components

Machinery Parts

Replacement and wear parts for plant equipment — shafts, sleeves, couplings, gears, sprockets, impellers, rollers, liners, screw flights and crusher spares. Where the original is obsolete we measure the worn component, identify the material, restore the design dimensions and improve the wear face if the failure mode justifies it.

Route: Reverse engineering from sample or drawing

Treatment: Hardening, tempering, nitriding, hardfacing

Materials: EN8, EN19, EN24, SS 304 / 316 / 410, Ni-hard

Supply: Single urgent spare or planned shutdown set

Bridge Scupper Box (Deck Drainage)

The inlet that takes rainwater off a bridge deck and into the drainage downpipe. It is cast into the deck slab, so it has to arrive with the grating, frame, outlet spigot and anchor lugs already correct — there is no adjusting it afterwards. Fabricated in mild steel, stainless or ductile iron and supplied hot-dip galvanised or epoxy coated for the exposure.

Box Size: 300 × 300 mm to 600 × 600 mm, or to drawing

Outlet: 100 mm to 250 mm NB spigot

Grating: Hinged, bolted or removable, load rated

Finish: Hot dip galvanised, epoxy painted, SS as supplied

In-House Machining Facility

Everything below sits in our own works, which is why a part never waits in someone else's queue.

CNC Turning CNC Milling Conventional Lathe Cutting Grinding Press Bending Drilling Electro Welding Spot Welding Laser Cutting PMI Testing MPI Testing

Materials & Grades

Selected for the duty — strength, wear resistance, corrosion resistance or weight, rarely all four at once.

Swipe the table sideways to see all columns.

Application	Typical Grades	Condition	Notes
General machined parts	EN8, C45, IS 2062	Normalised	Economical, readily weldable
Shafts & high-stress parts	EN19, EN24, AISI 4140 / 4340	Quenched & tempered	Hardness to 280–320 HB
Wear parts & bushes	EN31, Ni-hard, hardfaced CS	Hardened / overlaid	Up to 60 HRC on the wear face
Corrosion service	SS 304 / 316 / 316L / 410	Annealed	Passivated after machining
Aerospace structural	Al 6061-T6, Al 7075-T6, Ti Gr 5	Heat treated	Light, high strength-to-weight
High temperature	Inconel 718, SS 321, 15-5 PH	Solution & aged	Retains strength above 600 °C
Deck drainage	IS 2062 E250, SS 304, ductile iron	As supplied	Galvanised or epoxy coated

Where a sample part is supplied without documentation, PMI is used to establish the grade before manufacture begins.

Chemical Composition

Typical composition of the machining grades used most, percent by weight.

Swipe the table sideways to see all columns.

Grade	C	Mn	Si	Cr	Ni	Mo	Others
EN8 / C45	0.40–0.45	0.60–0.90	0.10–0.35	—	—	—	—
EN19 / 42CrMo4	0.36–0.44	0.65–0.90	0.10–0.35	0.90–1.20	—	0.15–0.30	—
EN24 / 817M40	0.36–0.44	0.45–0.70	0.10–0.35	1.00–1.40	1.30–1.70	0.20–0.35	—
EN31 / 100Cr6	0.95–1.10	0.30–0.75	0.10–0.35	1.30–1.60	—	—	—
SS 316	0.08 max	2.00 max	0.75 max	16.0–18.0	10.0–14.0	2.00–3.00	—
SS 410	0.08–0.15	1.00 max	1.00 max	11.5–13.5	0.75 max	—	—
15-5 PH	0.07 max	1.00 max	1.00 max	14.0–15.5	3.5–5.5	—	Cu 2.5–4.5, Nb 0.15–0.45
Inconel 718	0.08 max	0.35 max	0.35 max	17.0–21.0	50.0–55.0	2.80–3.30	Nb 4.75–5.50, Ti 0.65–1.15
Al 6061	—	0.15 max	0.40–0.80	0.04–0.35	—	—	Mg 0.8–1.2, Cu 0.15–0.40

Titanium Gr 5 (Ti-6Al-4V) is supplied to ASTM B348 / AMS 4928 with the mill certificate attached.

Mechanical Properties

Typical values in the delivered condition.

Swipe the table sideways to see all columns.

Grade	Tensile (MPa)	Yield (MPa)	Elongation (%)	Hardness
EN8 (normalised)	620–700	400	16	179–229 HB
EN19 (Q&T)	850–1000	680	13	248–302 HB
EN24 (Q&T)	930–1080	750	12	269–331 HB
EN31 (hardened)	—	—	—	58–62 HRC
SS 316 (annealed)	515	205	40	217 HB max
SS 410 (hardened)	760	620	15	Up to 45 HRC
15-5 PH (H900)	1310	1170	10	40–47 HRC
Inconel 718 (aged)	1275	1030	12	331–444 HB
Ti Gr 5 (Ti-6Al-4V)	895	828	10	334 HB
Al 6061-T6	310	276	12	95 HB

Hardness is verified after heat treatment and recorded against the batch before the part is released for final machining.

Applications

Where these components are put to work.

Aerospace & Defence

Machine Building

Bridges & Deck Drainage

Oil & Gas Equipment

Cement & Mining Plants

Power Generation

Pharmaceutical Machinery

Chemical Process Equipment

Shipyards & Marine

Refinery Turnarounds

Material Handling Systems

Infrastructure Projects

Inspection & Documentation

Precision that is not measured is only an intention.

First Article Inspection

The first part off a new program is measured feature by feature against the drawing and signed off before the batch runs.

PMI & MPI

Alloy verification on incoming material and magnetic particle inspection on machined ferritic parts and welds.

Heat Treatment Records

Hardening, tempering and stress relieving are carried out to a written cycle and the chart is retained with the batch.

Traceable Route Card

Every operation is signed as it is completed, so the history of a part can be reconstructed from raw bar to despatch.

Send a drawing, a model — or the worn part

We quote from 2D drawings, STEP files or a physical sample, and can reverse engineer obsolete spares where nothing else exists.

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