Product Category
Motor · Drive · Robot · NEMA / IEC / ISO 9409
FLG / 001 — 008
High-Precision
Multi-Hole Flanges
Custom CNC turned and milled flanges — bolt hole position tolerance ±0.01 mm (true position ⌀0.02 mm), concentricity of bolt circle to bore ≤ 0.01 mm, face runout ≤ 0.005 mm. For motor mounts, drive transmission flanges, and precision rotating interfaces.
⌀0.02mm
True Position
≤0.005mm
Face Runout
±0.05°
Angular Spacing
PART DWG · FLG-000 MOTOR FLANGE · 42CrMo4 HRC 32
ISO 9001 · ISO 9409-1 ROBOT
PCD ⌀100 · 8×M6
⌽ TP ⌀0.02 A B
Face Runout ≤0.005
Motor · Drive · Robot · Encoder
Flange Types
42CrMo4 · SUS316L · Al 7075 · Ti
Materials
48hr Quote · 5-Day Proto
Service
⌀0.02mm
True Position
bolt hole tolerance
bolt hole tolerance
≤0.005mm
Face Runout
transmission grade
transmission grade
≤0.01mm
Bolt Circle Conc.
to central bore
to central bore
5 Days
Fastest Delivery
prototype orders
prototype orders
Why It's Difficult
High-Precision Flange Challenges
Bolt hole position on a circular flange must be accurate both angularly (bolt circle diameter correct) and radially (each hole on the true bolt circle) — standard drilling does not achieve this.
⦿
True Position of Bolt Holes
Each bolt hole must be within ⌀0.02 mm true position of its nominal location on the bolt circle. This
requires CNC boring (not drilling) or precision jig boring — verified by CMM measuring each hole centre.
⊕
Bolt Circle Concentricity
The bolt circle must be concentric to the central bore within ≤ 0.01 mm. Non-concentricity causes angular
indexing error in bolted flanges — critical for motor coupling and reducer interfaces.
📐
Face Runout
The face must be perpendicular to the bore axis within ≤ 0.005 mm (face runout). A tilted face applies
uneven axial load to the mating component — critical for shaft coupling flanges and motor mounts.
Our Work
Request Similar Part →
High-Precision Multi-Hole Flanges We've Made
Real projects — CMM verified.
How It Works
From Drawing to Finished Part
Upload your 2D/3D file — receive DFM feedback, quote, and confirmed lead time within 48 hours.
01
Upload Drawing
STEP, DXF, PDF or sketch. 2D + 3D preferred.
02
DFM Review & Quote
Free DFM feedback + material, lead time, and cost — within 48 hours.
03
CNC Machining & QC
5-axis CNC, CMM inspection, full dimensional report.
04
Ship Worldwide
DHL / FedEx / sea freight. Inspection report enclosed.
Reviews
Trusted by Engineers Worldwide
★★★★★
"The CMM report matched our incoming inspection perfectly. Every critical dimension was within spec on the first article. Lead time exactly as quoted."
AK
Alex K.
Mechanical Engineer · Germany
★★★★★
"HXC's DFM review caught a tolerance stack issue before we committed to production. The finished parts were perfect and batch consistency was excellent."
SL
Sophie L.
Design Engineer · France
★★★★★
"We've sourced over 30 part numbers from HXC across three years. Quality is consistent, lead times are reliable, and the engineering team is always responsive."
JT
James T.
Senior Buyer · UK
FAQ
High-Precision Multi-Hole Flanges — FAQ
Common questions from engineers and procurement teams — answered by our manufacturing team.
True position is the diametral tolerance zone within which a hole centre must lie
relative to its nominal position. HXC achieves ⌀0.02 mm true position on flange bolt
holes — meaning each hole centre is within a circle of 0.02 mm diameter centred on the nominal
position. This is verified by CMM measuring each hole centre and calculating deviation from nominal.
Standard precision flanges: face runout ≤ 0.005 mm (measured as a full TIR sweep with
a dial indicator while rotating on the bore axis). For motor coupling flanges: ≤ 0.003 mm. Runout is
caused by face not being perpendicular to the bore — HXC turns face and bore in the same setup to
eliminate this.
Yes — HXC machines all standard motor flange patterns: NEMA 17/23/34/42;
IEC frame standards (56, 63, 71, 80, 90, 100); DIN 42948 / ISO 9409 robot
wrist flanges; and custom bolt circle diameters and hole counts. Provide the
motor model or bolt circle specification.
42CrMo4 (induction hardened): for high-load motor mount and reducer flanges.
SUS316L: for food processing, pump, and marine flanges. Al 7075
(hard anodized): lightweight robot output flanges. Ti Grade 5: for weight-critical
aerospace drive flanges. C45 steel (zinc plated): for standard industrial flanges.
CMM measures the centre of every bolt hole, computes the best-fit bolt circle, and
reports: bolt circle diameter (nominal vs actual), angular spacing between holes, and the
concentricity of the bolt circle to the bore. All four parameters are included in the inspection
report.
Yes — HXC machines O-ring grooves (BS 1806, Parker, or custom) concentric to the bore and bolt
pattern. O-ring groove dimensions (width, depth, corner radius) are machined to the seal manufacturer's
specification and verified by CMM.
Equal-spacing flanges: angular spacing tolerance ±0.05° between adjacent holes. For
precision indexing flanges (e.g., harmonic drive output flanges): ±0.02°. Angular position is computed
from CMM hole centre measurements — reported in the inspection certificate.
Prototype (1–5 pcs): 5–7 days. Small batch (50–200 pcs): 7–12 days. Production
(500+ pcs): 10–16 days.
Get a Quote
Send Your Drawing.
Get a Quote.
Every enquiry includes a DFM review — tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.
24hr
Quote Response
MOQ 1
Prototypes OK
ISO
9001:2015
📐
DFM Review on Every Enquiry
Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback — not generic pushback.
🎯
First Article Inspection — Standard
FAI report on every new run. Material certs and surface treatment certs included with every shipment.
🔄
Same Process: Prototype to Production
Process plan from your prototype applies to production batches. No re-qualification when you scale.
⚙
3 / 4 / 5-Axis CNC + Turning
Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.
ISO 9001:2015
3/4/5-Axis Milling
CNC Turning
CMM Inspection
Global Delivery