5 catalogued sizes, cast to ASTM A297 HK30. Pick any row and the technical drawing redraws to it.
Exhaust Manifold Flange to ASTM A297 HK30 are catalogued in overall length 80 mm to 200 mm, with width 33.6-84 mm, height 12.8-32 mm, section thickness 8-20 mm. 5 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Specification
ASTM A297 HK30
Alloys
HK30, WCB, AISI 4140 Cast
Size range
80 mm-200 mm
Wide
33.6-84 mm
Catalogued sizes
5
Dimensions are nominal casting dimensions before machining allowance. Confirm the tolerance grade and the machined features against your drawing before ordering.
Alloys & Grades
The Exhaust Manifold Flange is cast in 7 of the 63 grades we work in. Those are listed first; the full reference tree is underneath, with each designation shown alongside its ASTM/UNS, EN and GB equivalents.
HK30catalog gradeASTM A297 HK30 / UNS J94203 (GX40CrNiSi25-12)
WCBASTM A216 WCB / UNS J03002
AISI 4140 CastASTM A732 Gr 4140 / UNS G41400 (42CrMo4)
AISI 8620 CastASTM A732 Gr 8620 / UNS G86200
HK40ASTM A297 HK40 / UNS J94204
A356 / A356-T6ASTM B26 A356-T6 / AlSi7Mg0.3
Ti-6Al-4V (Grade 5)ASTM B367 Gr C-5 / UNS R56400 (Ti-6Al-4V)
Browse all 63 cast grades we work instainless · carbon & low-alloy · nickel & cobalt · copper · aluminium · titanium
C83600 Red BrassASTM B584 C83600 · UNS C83600 · 85-5-5-5
C87600 Silicon BrassASTM B584 C87600 · UNS C87600
C86300 Manganese BronzeASTM B584 C86300 · UNS C86300
Aluminum Alloy Castings
A356 / A356-T6ASTM B26 A356 · UNS A13560 · AlSi7Mg0.3 · EN AC-42000
A357ASTM B26 A357 · UNS A13570 · AlSi7Mg0.6
355 / C355ASTM B26 355 · UNS A03550 · AlSi5Cu1Mg
A201-T7ASTM B26 A201 · UNS A02010 · AlCu4MgTi
Titanium Castings
Ti-6Al-4V (Grade 5)ASTM B367 Gr C-5 · UNS R56400 · TC4 · Ti-6-4
CP Titanium Grade 2ASTM B367 Gr C-2 · UNS R50400
Special & Wear Alloys
Ni-Resist D-2ASTM A439 D-2 · UNS F43000
High-Chrome White IronASTM A532 Class III · 25Cr white iron
Technical Drawing
Every parameter below is editable, and the drawing redraws to match the values you choose. Picking a size snaps the other fields to that size's values; you can then override any one of them.
Sends the selected values to the quote form below.
Request a Quotation for Exhaust Manifold Flange
The form below follows the current drawing configuration. Change the values above and the request updates with them. Attaching a drawing or a STEP file is the fastest route to a firm price.
Dimensions & Parameters (ASTM A297 HK30)
Nominal casting dimensions before machining allowance. Every row is a starting point for the customizer above — pick any size and the drawing redraws to it.
Size
Overall Length L (mm)
Overall Width W (mm)
Overall Height H (mm)
Main Thickness T (mm)
Hole Diameter ØD (mm)
Min. Wall Thickness (mm)
Fillet Radius R (mm)
Casting Weight (kg)
80 mm
80
33.6
12.8
8
5
5
6.5
0.08
100 mm
100
42
16
10
6
6.2
8
0.16
125 mm
125
52.5
20
12.5
8
7.8
10
0.31
160 mm
160
67.2
25.6
16
10
9.9
10
0.64
200 mm
200
84
32
20
12
12.4
10
1.26
The Exhaust Manifold Flange is a vehicle casting produced by investment casting — the lost wax process — to ASTM A297 HK30. This page lists the full size range with the geometry an engineer needs to specify the part and request a quotation.
What Is a Exhaust Manifold Flange?
The Exhaust Manifold Flange is a vehicle casting. It is selected by overall length together with the wall thickness and the hole or port geometry shown in the table below, and is supplied in a range of alloys and surface conditions to suit the service.
How This Part Is Cast
A wax pattern is injected into a metal die, assembled onto a runner system, dipped repeatedly in ceramic slurry to build a shell, dewaxed, fired and poured. The result is a casting that reproduces the pattern closely enough that most surfaces need no machining at all, which is what makes the process worth its tooling cost at production quantity.
Alloy Options
The catalog specification calls for HK30. This part is supplied in HK30, WCB, AISI 4140 Cast, AISI 8620 Cast, HK40, A356 / A356-T6 and Ti-6Al-4V (Grade 5). The alloy drives both price and lead time more than any other choice on the RFQ, so state it if your drawing calls one out — and if it does not, describe the service (the medium, the temperature and the pressure) and we will propose one.
Tolerances, Finish & Machining
As-cast dimensions are held to ISO 8062-3 DCTG 6-8 on a silica sol shell, which is roughly ±0.3 mm on a 50 mm feature and widens with size. As-cast surface finish is typically Ra 3.2-6.3 µm. A machining allowance of 1.5-3 mm is added to the faces called out on the drawing; every other surface is supplied as-cast. State the tolerance grade and the finish you need on the RFQ — both change the price, and a tolerance nobody asked for is the most common avoidable cost on a casting.
Inspection & Testing
Chemical composition by spectrometer on every heat, with the certificate supplied against the specified grade.
Dimensional inspection against the drawing, with a first-article report on new tooling.
Verification of the heat-treatment condition and, on request, elevated-temperature mechanical testing.
The Exhaust Manifold Flange is made to order. Pricing starts from approximately US$9.60 per piece for the smallest listed size in HK30 at production quantity; the final figure depends on pour weight, alloy, machining scope, surface finish and order quantity, and tooling is a separate one-time charge. Submit the configuration above for a firm quotation.
Inside the plant
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Tooling & wax injection
An aluminum die is cut from your drawing or 3D model, and wax is injected into it under pressure. Everything downstream is a copy of this pattern, so the die is where the tolerance is actually decided — not on the shop floor afterwards.
First-article dimensional report on every new die before production wax is run.
02
Tree assembly & gating
Patterns are welded onto a wax runner to form a tree. How they are gated is not cosmetic: the gate positions decide which sections solidify last, and a heavy section fed from the wrong direction is where shrinkage porosity comes from.
Gating reviewed against the part's heaviest section before the first tree is built.
03
Ceramic shell building
The tree is dipped in ceramic slurry and stuccoed with refractory grain, six to eight times, drying between coats. The face coat is what the casting surface copies, which is why a silica sol face gives Ra 3.2-6.3 µm where a water-glass shell gives a coarser one.
Slurry viscosity and drying room temperature and humidity logged per coat.
04
Dewaxing
A steam autoclave melts the wax out fast, so that the wax — which expands more than the ceramic does — leaves before it can split the shell. Recovered wax is filtered and reused for gating rather than for patterns.
Every shell inspected for cracks after dewax; a cracked shell is scrapped, not patched.
Video: Exhaust Manifold Flange
Third-party video, selected automatically for this topic. It is not produced by Lost Wax Casting and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
What is the controlling specification for the Exhaust Manifold Flange?
The Exhaust Manifold Flange is cast to ASTM A297 HK30. The dimensions on this page follow that specification, and the material certificate supplied with the order is issued against it.
Which sizes of the Exhaust Manifold Flange does lostwaxcasting.net supply?
The table on this page lists 5 sizes for the Exhaust Manifold Flange by overall length, from 80 mm to 200 mm. Sizes outside the table are quoted on request — investment casting is tooled per part, so a new size is a new pattern die rather than a stock item.
Which alloys is the Exhaust Manifold Flange cast in?
The catalog specification calls for HK30. The Exhaust Manifold Flange is supplied in HK30, WCB, AISI 4140 Cast, AISI 8620 Cast, HK40 and A356 / A356-T6. The alloy drives both the price and the lead time more than any other choice on the RFQ, so state it if your drawing calls one out — and if it does not, describe the service (the medium, the temperature and the pressure) and we will propose one.
What wall thickness does the Exhaust Manifold Flange have?
The listed sizes run from 5 mm to 12.4 mm of nominal wall. Investment casting will hold a section down to about 1.5 mm in the silica sol shell used here — 0.6 mm on a small isolated feature — and the thin end of that range is a shell-filling question rather than a strength one. A section much heavier than the surrounding wall is the more common problem: it solidifies last and shrinks, so it is fed or cored rather than left solid.
How do I request a quotation?
Set the configuration on the technical drawing above — size, alloy, finish — and click "Request this configuration". The values carry into the quote form below it. Attach a drawing or a STEP file if you have one; it is the fastest route to a firm price, and it lets us flag any castability issue before you commit to tooling.
Guides for the Exhaust Manifold Flange
Each grade changes the price, the weight and what the part survives, so there is a page per grade for this part: HK30 (the catalog grade), HK40 (creep strength in furnace duty), WCB (the carbon-steel cost baseline), AISI 4140 Cast (quench-and-tempered, highest loaded), AISI 8620 Cast (case hardening, for gear teeth) and A356 / A356-T6 (a third of the density).
How it is shelled decides the tolerance and the surface you get, and the tolerance band is worked out against this part's own dimensions on each: Silica Sol Casting (DCTG 5 – 7, Ra 3.2 – 6.3 µm), Water Glass Casting (DCTG 7 – 9, Ra 6.3 – 12.5 µm) and Composite Shell Casting (DCTG 6 – 8, Ra 6.3 – 12.5 µm).
If the question is still whether a casting is the right way to make this part at all, the Exhaust Manifold Flange application guide covers where it is used, what has to be decided before a price exists, and where investment casting is the wrong answer.
Need a casting quote or a castability review?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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