4102-120KV – Flange Yokes – 1410 Series – Bolt Circle Dia 3.950″ – Bolt Hole Dia 0.430
$102.09
0 in stock
Description
Part 4102-120KV is a 1410 series flange yoke with a 4-bolt 3.950″ bolt circle, 4.745″ male pilot for direct bolt-on replacement of companion differential flanges. Forged steel, precision-machined, in stock at Universal Driveshafts.
Full Description
Drivetrain Bolt-Flange Interface: The 4102-120KV Explained
Flange yokes carry the full torque of the driveshaft into the differential or transfer case through a bolted joint rather than a sliding spline. The 4102-120KV is a 1410 series part with specific dimensions selected for companion flanges presenting a 3.950" bolt circle. Its 4.745" pilot registers the part on center before any bolt is tightened -- critical for balance and for preventing the bolts from carrying shear loads they were not designed for.
Part Specifications
| Specification | Value |
|---|---|
| Series | 1410 |
| Bolt Circle Dia | 3.950" |
| Bolt Holes | 4 |
| Bolt Hole Dia | 0.430" |
| Pilot Dia | 4.745" (pilot) |
| CJ to Flat | 2.875" |
| Material | Forged Steel |
| Brand | UDS |
| Part Number | 4102-120KV |
The Role of CJ-to-Flat Dimension
The CJ-to-flat measurement (2.875" on the 4102-120KV) defines the distance from the center of the u-joint cross to the machined face of the flange. This dimension must match the geometry of the companion flange's recess -- too short and the cross will not seat; too long and the cross will be pre-loaded against the cap bottoms. Always verify this against the companion flange you are mating to, especially in custom or multi-make builds where the flange may have come from a different vehicle platform.
Installation Best Practices
- Clean companion flange face thoroughly -- any burr or scale under the mating surface creates runout
- Insert pilot and hand-thread all fasteners before torquing any single bolt
- Torque 4 bolts in a star pattern to achieve even clamping
- Verify zero wobble by rotating the shaft by hand before lowering the vehicle
- If using a rubber strap-type u-joint retention, confirm strap bolt torque is within 1410 series spec
Why Universal Driveshafts Stocks This Part
Universal Driveshafts maintains deep inventory across 1410 series components because this is a high-velocity replacement category -- axle shops, fabricators, and fleet operators all need these parts on short notice. The 4102-120KV is available for immediate shipment, so downtime is measured in hours, not weeks.
Need help with fitment? See our flange yoke guide for bolt patterns, pilots, and measuring tips.
Additional information
| Bolt circle dia | 3.950 |
|---|---|
| Bolt hole dia | 0.430 |
| Cj to flat | 2.875 |
| Partn number | 4102-120KV |
| Pilot dia | 4.745, OD |
| Series | 1410 |
| Bolt Holes | 4 |
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| Flange Yokes (242) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | Partn number 10-2-29 Series 1000 Pilot dia 2.250 Bolt circle dia 2.750 Bolt hole dia 4 Brand SPICER Notes Rec Bolt Pattern Bolt Holes 4 Cj to flat 1.562 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.200 Bolt hole dia 0.411 Cj to flat 1.125 Partn number 1102-191 Pilot dia 1.968 ⋅ M Series ATV Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.576 Bolt hole dia 0.471 Cj to flat 1.625 Partn number 1202-077 Pilot dia 1.899-F Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Pilot dia 1.811 Partn number 1202-181 Bolt Holes 4 Bolt hole dia 0.400 Series 1251 Bolt circle dia 3.200 Cj to flat 1.625 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.550 Bolt hole dia 0.425 Cj to flat 1.625 Partn number 1202-196 Pilot dia 1.968-M Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 2.950 Bolt hole dia 0.395 Cj to flat 1.900 Partn number 1202-20 Pilot dia 1.968-M Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.555 Bolt hole dia 0.427 Cj to flat 1.750 Partn number 1202-201 Pilot dia 1.991-F Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.200 Bolt hole dia 0.406 Cj to flat 1.750 Partn number 1202-21 Pilot dia 1.968-M Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 3.347 Bolt hole dia 0.407 Cj to flat 1.625 Partn number 1202-237 Pilot dia 2.375-M Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| | Bolt circle dia 2.750 Bolt hole dia 0.323 Cj to flat 1.375 Partn number 1202-252 Pilot dia 2.248-M Series 1251 Bolt Holes 4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
