Wheel nuts & locks
Seat profile · thread pitch
McGard · China procurement desk
McGard wheel-end sourcing
Source wheel fasteners, hub centric rings, balancing weights and service parts through an independent China procurement desk. Define the mating surfaces and acceptance checks before comparing quotes.
01 · Parts under review
Four accessory lines
Hub centric rings
Wheel bore · hub pilot
Wheel weights
Rim flange · mass steps
TPMS service parts
Protocol · valve geometry
02 · Specification intake
Same thread, different seat
Example comparison for a wheel nut brief. A shared thread callout still leaves the wheel seat, tool envelope and engagement to verify.
| Check | Cone-seat option | Ball-seat option |
|---|---|---|
| Seat geometry | Confirm cone angle from the wheel drawing. | Confirm seat radius and contact profile. |
| Engagement | Check engaged thread and closed-end clearance against the stud. | Check stud protrusion with the ball seat fully seated. |
| Tool access | Compare socket outer diameter with the recess. | Check lock key or socket clearance at the seat. |
03 · Review sequence
From interface to purchase decision
- 01
Freeze the reference
Identify the wheel, hub or vehicle and record which drawing revision governs.
- 02
Normalize the quotes
Separate sample cost, tooling, pack count, MOQ and the named Incoterm location.
- 03
Review the sample
Compare the sample with mating parts and agree who checks the critical dimensions.
- 04
Prepare the handoff
Reconcile SKU labels, lot IDs and carton counts before shipment coordination.
04 · Buyer programs
Which program are you sourcing for?
Distributors
Separate seat and thread variants in the catalog.
Fleet buyers
Group replacement hardware by vehicle platform.
Service networks
Specify service kits and compatible valve parts.
Import teams
Agree label fields for mixed accessory shipments.
05 · Review trail
Evidence before commitment
Supplier-provided
Revision sheet
Match the drawing number, revision and finish to the quote.
Supplier-provided
Scope record
Record the legal entity and site named on relevant quality system documents.
Third-party
Inspection scope
Agree the sample plan, gauges and acceptance criteria with the appointed inspector.
Third-party
Test applicability
Where a report is needed, map its specimen and method to the offered configuration.
Buyer-approved
Reference sample
Keep a signed sample ID tied to the approved revision and intended mating parts.
Buyer-approved
Pack instruction
Approve label units, kit contents and separation of close lookalike SKUs.
06 · Questions to settle early
Common fitment and buying questions
How should I state a ring size?
Send the wheel center bore and hub pilot diameter in millimeters, in that order, with the chamfer and usable pilot depth. For a 66.6 to 57.1 example, the dimensions still need to be checked against your parts.
What are hub centric rings used for?
A compatible ring locates an oversized wheel center bore on a smaller hub pilot during mounting. Wheel seat geometry, fasteners and tightening requirements still need separate checks.
Can I compare clip-on wheel weights by mass alone?
Compare mass increments after matching the flange contour and clip reach. A clip that touches the rim incorrectly can change seating even when the nominal weight is right.
When can a supplier quote MOQ and timing?
Ask for both against the exact finish, package unit and revision. Separate sample timing from production and export coordination in each quotation.
Bring one part reference to the desk
Share the application and the dimension or interface that still needs confirmation.
Prepare your specification