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JIS standard precision rolled ball screw 8x1

8X1 ball screw
Material:Gcr15 or 9cr18 or SUS440C
MOQ:1 set
Application:CNC router, CNC machine Medical device
  • 0801

  • ALM

  • 8483401000

According to the standard of JIS,we classified our lead accuracy through E, e, e300 and e2π, four main regulations. As figure 1.3.1 ~ 1.3.3 shown in below, all the definition and tolerance are specified.

To test the accumulated travel deviations for grade C7 and C10, the tolerance will be chosen in

random 300mm of useful length and evaluated if it is qualified with the e300 table of 1.3.3.

ball screw lead accuracy

Not like the other manufacturer,ALM can not only produce ground ball screws,but also the rolled types.

Rolled ball screws range:Diameter 4mm to 120mm.

Popular items:0401, 0601, 0602, 0606, 0801, 0802.5, 0805, 0808, 0812,1002, 1202, 1205, 1210

Accuracy can be C3 C5 C7

Lead time:3~10 days

Ground ball screws range:Diameter 3mm to 120mm.

Accuracy can be C1 C3 C5 C7

Lead time:10~30 days

        Reference             Definition              Allowable


 Travel  Compensation



Travel compensation is the deduction between specified and nominal

travel in the useful travel. A slightly smaller value compared with nominal

travel is often selected by customer, to compensate for an expected elongation

caused by temperature rise or external load. Therefore ” T ” is

usually a negative value.

Note : if no compensation is needed, specified travel is the same as nominal travel.

         Actual Travel

Actual travel is the axial displacement of the nut relative to the screw


         Mean Travel 

Mean travel is the linear best fit line of actual. This could be obtained

by the least squares method. This line represents the tendency of actual


  Mean Travel Deviation


Mean travel deviation is the deduction between mean travel and specified

travel within travel length.

Table 1.3.2


  Travel Variations




Travel variations is the coverage of 2 lines drawn parallel to the mean


Maximum width of variation within the travel length.

Actual width of variation for the length of 300mm taken anywhere within

the travel length.Wobble error, actual width of variation for one revolution

(2π radian)

Table 1.3.2

Table 1.3.3

Table 1.3.3

ball screw accuracy

Cautions About Use of Ball Screws:Ball screw assemblies are delicate components.Therefore,extra care must be taken to prevent the ball track from damages that caused by edged component or tools. 

Meanwhile, the steel ball is very easily fall out of the nut or over stroke. Don't disassemble it.

ball screw disassemble

Otherwise,the ball screw will be damaged.

To prevent steel ball fall out of the nut through the disassembly of screw and nut or over stroke, please be careful while operating. 

If the steel ball falls out, please contact with ALM Linear Motion for further instruction.Do not attempt to reassemble, which might cause permanent damage to the ball screw.

If disassemble is required, please use a transfer pipe which has minor diameter than the screw

diameter to transfer the nut to prevent falling out of the steel balls.

ball screw dummy shaft

Precision rolled ball screw catalog:

miniature series C3 C5 C7 ball screw-ALM 3.31M.pdf

 Email or call us for a quote right now!






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