ALTRA 9 | FLANGED AXLES
A9 FLANGED CUSTOM ALLOY AXLES – 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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| A9-28-AXLE |
28 SPLINE 1541H AXLE
(35.02mm SMALL BEARING) |
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| A9-31-AXLE |
31 SPLINE 1541H AXLE
(35.02mm SMALL BEARING) |
A9 FLANGED CUSTOM ALLOY RACE AXLES – 25, 28 & 31 SPLINE
These are USA manufactured hi-performance 4140 Chrome moly 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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| A9-25S-AXLE |
25 SPLINE 4140 AXLE
(35.02mm SMALL BEARING) |
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| A9-28S-AXLE |
28 SPLINE 4140 AXLE
(35.02mm SMALL BEARING) |
| A9-31S-AXLE |
31 SPLINE 4140 AXLE
(35.02mm SMALL BEARING) |
A9 FLANGED CUSTOM ALLOY RACE AXLES – 28, 31 & 35 SPLINE
These are USA manufactured hi-performance 4140 Chrome moly forged induction heat treated alloy 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 |
28 SPLINE 4140 AXLE
(39.71mm LARGE BEARING) |
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| A9-31L-AXLE |
31 SPLINE 4140 AXLE
(39.71mm LARGE BEARING) |
| A9-35L-AXLE |
35 SPLINE 4140 AXLE
(39.71mm LARGE BEARING) |
A9 FLANGED CUSTOM FORD ALLOY RACE AXLES – 28 & 31 SPLINE
These are USA manufactured hi-performance 4140 Chrome moly forged induction heat treated alloy axles supplied with cut splines and 11mm heavy duty flanges. Drilled to suit your stud pattern with 1/2" press in wheel studs.
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| Item Number |
Description |
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| A9-28F-AXLE |
28 SPLINE 4140 AXLE
(37.00mm FORD BEARING) - EACH |
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| A9-31F-AXLE |
31 SPLINE 4140 AXLE
(37.00mm FORD BEARING) - EACH |
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 or 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 – 25S, 28, 28S, 31 & 31S SPLINE
(ANY STUD SIZE EXCLUDES 5/8") |
| A9-12-002 |
A9 ALLOY AXLE INSTALLATION KIT – 25S, 28, 28S, 31 & 31S SPLINE
(5/8" STUDS) |
| A9-12-003 |
A9 ALLOY RACE AXLE INSTALLATION KIT - 28L, 31L, 31F & 35L SPLINE
(ANY STUD SIZE EXCLUDES 5/8") |
| A9-12-004 |
A9 ALLOY RACE AXLE INSTALLATION KIT - 28L, 31L, 31F & 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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