The world famous OX Accelerator furnace bake-coated with Molybdenum & PTFE for Progressive Lubrication & Rapid Acceleration. With up to 40% more compressed poundage than conventional mainsprings.
Please Note: installation of springs into air rifles sometimes requires removal of coils by grinding and/or cutting the spring. This is normal and before purchasing and fitting should be taken into consideration
We are unable to accept any returns with opened packaging, or modified/damaged springs
Removal and fitment of an airgun spring can be dangerous as they can be under considerable preload. If in doubt do not attempt the repair consult a qualified gunsmith.
Please note that there are many factors involved in finding the right size replacement spring for your rifle. Even if listed sometimes the particular set up of a rifle will result in a different size being required. It is important to replace your existing spring with a similar size spring. Our spring size chart is shown below to assist with this.
Size Chart
(NB manufacturing tolerances may produce up to a +/-2% size difference)
Model No.1 OD = 21 ID = 14.20 Wire = 3.19 Coils= 39 Length - 280
Model No.2 OD = 19.20 ID = 12.78 Wire = 3.26 Coils= 34 Length - 240
Model No.3 OD = 20.41 ID = 13.78 Wire = 3.10 Coils= 31.5 Length - 235
Model No.4 OD = 22.75 ID = 14.40 Wire = 3.80 Coils= 26.5 Length - 235
Model No.5 OD = 23.50 ID = 15.80 Wire = 3.54 Coils= 31.5 Length - 265
Model No.6 OD = 20.45 ID = 13.55 Wire = 3.02 Coils= 38 Length - 310
Model No.7 OD = 20.40 ID = 13.80 Wire = 3.15 Coils= 31.5 Length - 235
Compatibility list:
No.1 fits BSA Lightning Airsporter, Mercury, Supersport, Superstar, Goldstar, Anschutz 335, Original 35, 45, 50, 38 RWS. 24, 27, 34, 45, 50, Relum, Air Arms (all models), HW85, HW55, HW50, Haenel, Lion, ASI CF 16/20, Webley Mk3 (if the spring guide is reduced by 20 thou), HW95, HW98, HW99.
No.2 fits BSA Meteor, Milbro Diana G80 and 27, Norica, Baikal, Cometa 300/400 plus 5, 50, 100, 220 with coils removed, most SMK models.
No.3 fits BSA Superstar (12 ft-pounds only), Webley (All models except Eclipse and Mk3), Remmington Express.
No.4 fits HW35, Diana Original RWS 52, 48, 54
No.5 fits HW80, Webley Eclipse
No.6 fits HW77, HW97, Feinwerkbau Sport, also larger original models if ultimate power required.
No.7 fits ASI Sniper, Magnum (and all other ASI models
Ox Accelerator Main Spring Airgun Spring Air Rifle Mainspring - Yellow No.5
Please note that to order this product, you must be 18 years of age or older. At Boxz we do the necessary age verification checks for you. However, if we are unable to verify you through our system checks; you will need to provide a copy of your ID prior to dispatch.
The Red Original OX Mainspring® is our standard spring which will require suitable lubricant when fitting (see Bisley Gun Grease in shop). The Yellow Accelerator OX Mainspring® are specially furnace baked with a Molybdenum & PFTE coating (much like a teflon coating on a frying pan) for progressive lubrication and rapid accelleration whilst firing. This therefore reduces the probability of dieseling in your rifle which can occur with too much lubrication