7 catalogued sizes, cast to ASTM A732 Gr 8620 / made to drawing. Pick any row and the technical drawing redraws to it.
Gear Blank (Spur) to ASTM A732 Gr 8620 / made to drawing are catalogued in outer diameter Ø60 to Ø250, with width 18-75 mm, bore 18-76 mm, hub diameter 34.8-145 mm. 7 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Specification
ASTM A732 Gr 8620 / made to drawing
Alloys
AISI 8620 Cast, CF8M, CF8
Size range
Ø60-Ø250
Wide
18-75 mm
Catalogued sizes
7
Dimensions are nominal casting dimensions before machining allowance. Confirm the tolerance grade and the machined features against your drawing before ordering.
Alloys & Grades
The Gear Blank (Spur) is cast in 10 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.
AISI 8620 Castcatalog gradeASTM A732 Gr 8620 / UNS G86200
CF8MASTM A351 CF8M / UNS J92900 (cast 316)
CF8ASTM A351 CF8 / UNS J92600 (cast 304)
CA6NMASTM A743 CA6NM / UNS J91540
CA15ASTM A743 CA15 / UNS J91150 (cast 410)
CA40ASTM A743 CA40 / UNS J91153 (cast 420)
CB7Cu-1 (17-4 PH)ASTM A747 CB7Cu-1 / UNS J92180 (17-4 PH)
WCBASTM A216 WCB / UNS J03002
WCCASTM A216 WCC / UNS J02503
AISI 4140 CastASTM A732 Gr 4140 / UNS G41400 (42CrMo4)
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 Gear Blank (Spur)
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 A732 Gr 8620 / made to drawing)
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
Outer Diameter ØD (mm)
Overall Width W (mm)
Bore Diameter Ød (mm)
Hub Diameter ØD1 (mm)
Blade Thickness T (mm)
Blade Count
Fillet Radius R (mm)
Casting Weight (kg)
Ø60
60
18
18
34.8
4.8
0
4
0.11
Ø80
80
24
24
46.4
6.4
0
5
0.26
Ø100
100
30
30
58
8
0
6.5
0.51
Ø125
125
37.5
38
72.5
10
0
8
1.01
Ø160
160
48
48
92.8
12
0
9.5
2.11
Ø200
200
60
60
116
12
0
9.5
4.12
Ø250
250
75
76
145
12
0
9.5
8.04
Produced to ASTM A732 Gr 8620 / made to drawing, the Gear Blank (Spur) is a machinery casting from lostwaxcasting.net. Every listed size drives the technical drawing above, so the dimensions you see are the dimensions you quote against.
What Is a Gear Blank (Spur)?
The Gear Blank (Spur) is a machinery casting. It is selected by outer diameter 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
The blade or vane profile is formed in the wax pattern and reproduced in the shell, so the cast surface is the working surface and needs no profile machining. Only the bore, the hub face and any balance features are machined afterwards. The blade root fillet is a real casting feature, not a drafting convention: it is where the section changes fastest and where a sharp corner becomes a hot tear.
Alloy Options
The catalog specification calls for AISI 8620 Cast. This part is supplied in AISI 8620 Cast, CF8M, CF8, CA6NM, CA15, CA40, CB7Cu-1 (17-4 PH) and WCB. 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. The bore and the hub face are machined and, where the drawing calls for it, held concentric within the runout stated on it. 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.
Dynamic balancing to the grade stated on the drawing (commonly ISO 1940 G6.3 for pump and fan duty).
The Gear Blank (Spur) is made to order. Pricing starts from approximately US$12.60 per piece for the smallest listed size in AISI 8620 Cast 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.
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
Which specification governs the Gear Blank (Spur)?
The Gear Blank (Spur) is cast to ASTM A732 Gr 8620 / made to drawing. The dimensions on this page follow that specification, and the material certificate supplied with the order is issued against it.
Which sizes of the Gear Blank (Spur) does lostwaxcasting.net supply?
The table on this page lists 7 sizes for the Gear Blank (Spur) by outer diameter, from Ø60 to Ø250. 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 Gear Blank (Spur) cast in?
The catalog specification calls for AISI 8620 Cast. The Gear Blank (Spur) is supplied in AISI 8620 Cast, CF8M, CF8, CA6NM, CA15 and CA40. 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 Gear Blank (Spur) have?
The listed sizes run from 4.8 mm to 12 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.
Is the Gear Blank (Spur) dynamically balanced?
The Gear Blank (Spur) rotates in service, so it is balanced to the grade stated on the drawing — commonly ISO 1940 G6.3 for pump and fan duty, and tighter for high-speed work. Balance is done after the bore and the hub face are machined, because those are the datums the balance is measured against.
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 Gear Blank (Spur)
Each grade changes the price, the weight and what the part survives, so there is a page per grade for this part: AISI 8620 Cast (the catalog grade), CF8M (the chloride-resistant default), CF8 (cheaper, where chlorides are absent), WCB (the carbon-steel cost baseline), CA6NM (tough and cavitation resistant) and CA15 (hardenable, for wear-loaded duty).
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 Gear Blank (Spur) 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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