ARB Air Lock­ers

ARB cre­ated its Air locker diff in­sert range to pro­vide 100 per­cent trac­tion on de­mand, with­out sac­ri­fic­ing a 4WD’s on- road per­for­mance.


ARB Air Lock­ers work by us­ing a 12 volt air com­pres­sor to ac­ti­vate and de­ac­ti­vate a solid and durable lock­ing mech­a­nism in­side the dif­fer­en­tial. De­liv­er­ing trac­tion on de­mand at the flick of a dash mounted switch, the Air Lock­ers al­low own­ers to drive at a slower and more con­trolled pace, even in the harsh­est ter­rain.

The com­pany launched its Air Locker range back in 1988 and since then has sold thou­sands units to sat­is­fied cus­tomers through­out the world.

De­sign has evolved

Since 1988 it has also been evolv­ing the Air Locker de­sign to the point where it now in­cor­po­rates fea­tures such as forged gears, timed gear­ing and a two-piece de­sign, along with launch­ing a new logo and five- year war­ranty. The phe­nom­e­nal amount of force ap­plied to the gears means that their strength, dura­bil­ity and fa­tigue re­sis­tance is paramount, so forged gears have been im­ple­mented across the range. When com­bined with ARB’s patented ‘ timed gear’ de­sign, the re­sult­ing strength of the whole assem­bly is am­pli­fied. Sim­ply put, tim­ing the gears en­sures that no matter when the Air Locker is ac­ti­vated, the gear teeth will al­ways ‘ lock’ into pre­de­ter­mined po­si­tions that of­fer the great­est sur­face area be­tween the gear teeth. This en­sures that op­ti­mal lock­ing strength is achieved ev­ery time the Air Locker is ac­ti­vated. A two-piece case brings fur­ther ben­e­fits. Ma­chin­ing a case from two pieces in­stead of three re­sults in a much higher di­men­sional ac­cu­racy of the finished assem­bly. Elim­i­nat­ing the smaller cylin­der cap as a sep­a­rate part and switch­ing the air en­try to the crown wheel side of the dif­fer­en­tial not only adds huge strength, it also al­lows ARB to re­fine the lock­ing mech­a­nism de­sign, elim­i­nate the need for an in­ter­nal an­nu­lar pis­ton, and lock the side gear di­rectly to a re­designed high­strength flange cap. This also al­lows the lock­ing ring to re­side closer to the splined side gear, con­sid­er­ably re­duc­ing ac­tu­a­tion and dis­en­gage­ment time.

Lat­est tech

ARB’s Air Locker di­vi­sion, based in Mel­bourne, utilises the lat­est ar­se­nal of soft­ware pro­grams, in­clud­ing Solid­works, CAD and Cos­mos, in the de­vel­op­ment of all Air Lock­ers. The lengthy de­sign process in­volves count­less hours of test­ing us­ing Fi­nite El­e­ment Anal­y­sis ( FEA), which al­lows the en­gi­neers to sub­ject each Air Locker de­sign to ‘ vir­tual’ off road driv­ing sim­u­la­tions which are im­pos­si­ble to repli­cate in the real world. Pro­to­types are then fit ted to 4WDs for real-world test­ing in the Out­back NSW, the Flin­ders Ranges and Vic­to­rian High Coun­try. Pro­to­types have also been sent in­ter­na­tion­ally to be put through their paces in ex­treme off road rac­ing events like the iconic King of the Ham­mers in the South­ern Cal­i­for­nia desert. ARB Air Lock­ers are all man­u­fac­tured in a world class, aero­space stan­dard ma­chine shop in Mel­bourne. Util­is­ing aero­space grade ma­te­ri­als and state of the art ma­chin­ery, the fa­cil­ity en­sures that the Air Locker main­tains its rep­u­ta­tion for qual­ity, dura­bil­ity and re­li­a­bil­ity through­out the world. ARB Air Lock­ers are avail­able for an ex­ten­sive range of ve­hi­cle mod­els, with over 100 ap­pli­ca­tions. For more In­for­ma­tion or Tech­ni­cal Sup­port con­tact your near­est ARB Agent on 0800 ARB 4WD ( 272 493) or go to­

About ARB

Founded in 1975 in Mel­bourne, ARB 4x4 Ac­ces­sories is now Aus­tralia’s largest man­u­fac­turer and dis­trib­u­tor of af­ter­mar­ket 4WD ac­ces­sories. With prod­ucts in­clud­ing bull bars, pro­tec­tion equipment, Old Man Emu sus­pen­sion, Air Lock­ers, roof racks, canopies and re­cov­ery equipment, our pri­mary mis­sion is to pre­pare ve­hi­cles for the re­mote and harsh con­di­tions t yp­i­cally en­coun­tered off road. ARB cur­rently has 47 stores and over a hun­dred stock­ists lo­cated across Aus­tralia, an of­fice in Seat­tle, USA, and an ex­port net­work reach­ing more than a hun­dred countries.

ARB Air Locker diff in­serts pro­vide trac­tion on de­mand.

An ARB Air Locker in­stalled…

And ready for ship­ping

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