ALTRA 9 | FLANGED AXLES
A9 FLANGED CUSTOM ALLOY AXLES – 25, 28 & 31 Spline
These are USA manufactured hi-performance 1541 forged induction heat treated alloy axles supplied with cut splines and 10mm heavy duty flanges. Drilled to suit your stud pattern with an option of 7/16", 1/2", 5/8" M12 & M14 press in wheel studs or 1/2" & 5/8" screw in studs.
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| Item Number |
Description |
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| A9-25-AXLE |
AXLE 25 SPLINE 1541 INDUCTION
HARDENED USA ALLOY |
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| A9-28-AXLE |
AXLE 28 SPLINE 1541 INDUCTION
HARDENED USA ALLOY |
| A9-31-AXLE |
AXLE 31 SPLINE 1541 INDUCTION
HARDENED USA ALLOY |
A9 FLANGED CUSTOM ALLOY RACE AXLES – 28, 31 & 35 Spline
These are USA manufactured hi-performance 4140 Chrome moly forged induction heat treated alloy large bearing axles supplied with cut splines and 11mm heavy duty flanges. Drilled to suit your stud pattern with an option of 7/16", 1/2", 5/8" M12 & M14 press in wheel studs or 1/2" & 5/8" screw in studs.
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| Item Number |
Description |
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| A9-28L-AXLE |
AXLE 28 SPLINE 4140 INDUCTION
HARDENED USA ALLOY |
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| A9-31L-AXLE |
AXLE 31 SPLINE 4140 INDUCTION
HARDENED USA ALLOY |
| A9-35L-AXLE |
AXLE 35 SPLINE 4140 INDUCTION
HARDENED USA ALLOY |
| A9-31F-AXLE |
AXLE 31 SPLINE FORD BEARING
4140 INDUCTION HARDENED USA ALLOY |
The kits below are only able to be ordered when ordering a Custom Axle (Above).
They are not sold as stand alone kits. All the items are available to order
individually through the corresponding product page.
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These kits comprise of the following items:
- Wheel studs of your choice (5/8" studs additional)
- Heavy duty zinc plated bearing retainers
- Heavy duty "Timken" axle bearings (25, 28 & 31 spline alloy axles)
- Heavy duty "Timken & Greens" axle bearings (28, 31 & 35 spline alloy race axles)
- Above items workshop fitted to your axle order
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| Item Number |
Description |
| A9-12-001 |
A9 ALLOY AXLE INSTALLATION KIT 25, 28 & 31 SPLINE (ANY STUD SIZE EXCLUDES 5/8") |
| A9-12-002 |
A9 ALLOY AXLE INSTALLATION KIT 25, 28 & 31 SPLINE (5/8" STUDS) |
| A9-12-003 |
A9 ALLOY RACE AXLE INSTALLATION KIT 28L, 31L & 35L SPLINE
(ANY STUD SIZE EXCLUDES 5/8") |
| A9-12-004 |
A9 ALLOY RACE AXLE INSTALLATION KIT 28L, 31L & 35L SPLINE (5/8" STUDS) |
A9 FLANGED ALLOY AXLE SPECIFICATIONS
- CNC machined from premium forged steel
- Induction hardened to resist bending loads encountered with street/strip use
- Harder bearing surface area than OEM – for improved bearing / axle life
- Deeper case hardening than OEM – for superior torsional strength
- Flanges thicker than OEM
- Fits OEM bearings
- Fully ground bearing and seal surfaces
- Splines cut to the proper involute form
- Stud patterns machined to your requirements
- Manufactured in the USA
A9 FLANGED AXLE TORQUE RATINGS
23 Spline – 2875 ft-lb (per axle)
25 Spline – 3750 ft-lb (per axle)
28 Spline – 4800 ft-lb (per axle)
31 Spline – 7000 ft-lb (per axle)
35 Spline – 9600 ft-lb (per axle)
FORMULA FOR AXLE TORQUE
(Max torque of your car (ft-lb) x (gearbox first gear ratio) x (diff ratio) x 90% efficiency.
Each axle should be able to handle all of the maximum torque your car can produce. This will create a 200% safety factor.
Example: A car has 600 ft-lb of torque, Turbo 350 transmission (2.52 ratio 1st gear) and a 9" diff (4.11 ratio gears)
Calcuated as: (600) x (2.52) x (4.11) x 90% = 5592 ft-lb
Therefore it is recommended that you use a 31 Spline axle which has a Torque
capacity of 7000 ft-lb
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