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.

Billet Axles
Item Number Description  
A9-28-AXLE 28 SPLINE 1541H AXLE
(35.02mm SMALL BEARING)
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.

Billet Axles
Item Number Description  
A9-25S-AXLE 25 SPLINE 4140 AXLE
(35.02mm SMALL BEARING)
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.

Billet Axles
Item Number Description  
A9-28L-AXLE 28 SPLINE 4140 AXLE
(39.71mm LARGE BEARING)
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.

Billet Axles
Item Number Description  
A9-28F-AXLE 28 SPLINE 4140 AXLE
(37.00mm FORD BEARING) - EACH
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.

A9 AXLE INSTALLATION KIT

 

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
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

 

rear end components
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