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SFS Ball Screw — Miniature to Large Lead | HLTNC
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SFS Ball Screw — Miniature to Large Lead | HLTNC

SFS ball screws from 12 to 100 mm shaft diameter with leads from 5 to 50 mm, single nut, up to 51,455 kgf static load. Ask HLTNC for a quote.
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Product Introduction

SFS: the widest range in the catalogue

Where the other series are built around a particular duty, SFS is built around coverage. It starts at a 12 mm shaft for instrument and miniature axes and runs to a 100 mm shaft for the heaviest loads in the range, with leads from 5 mm up to 50 mm along the way.

That breadth makes it the series to look at when your requirement does not fit the shape of the others - an unusual combination of small diameter and long lead, or a very large diameter with a modest lead for stiffness rather than speed.

Because so many sizes are offered, several screws appear with more than one circuit count, for example SFS02005-3.8 against SFS02006-4.8. Reading the pair as a load-versus-length choice is usually the fastest way to narrow the table down.

Getting through a 45-model table quickly

The code tells you the two numbers you are filtering on before you open the table: shaft diameter, then lead. SFS02005-3.8 is a 20 mm shaft with a 5 mm lead; SFS10020-3.8 is a 100 mm shaft with a 20 mm lead. The suffix after the hyphen is the circuit count, and unlike most series here it is given to one decimal place.

A practical way to use the table: fix the lead from the speed you need, then move down the diameter column until the dynamic load Ca clears your duty with margin. The K column gives the axial stiffness of the nut, which is what decides how much the axis deflects under cutting force even when the load rating looks ample.

SFS dimensions, 12–100 mm

SFS models (mm, kgf)

Model No d Lead Da D A B L W H Ca kgf Coa kgf K kgf/µm
SFS01205-2.8 12 5 2.5 24 40 10 31 32 30 434 788 11
SFS01210-2.8 12 10 2.5 24 40 10 48.5 32 30 422 711 12
SFS01605-3.8 15 5 2.778 28 48 10 38 40 40 730 1501 17
SFS01610-2.8 15 10 2.778 28 48 10 47 38 40 551 1090 13
SFS01616-1.8 15 16 2.778 28 48 10 45 38 40 363 681 8
SFS01616-2.8 15 16 2.778 28 48 10 61 38 40 530 1059 12
SFS01620-1.8 15 20 2.778 28 48 10 57 38 40 364 700 8
SFS02005-3.8 20 5 3.175 36 58 10 40 47 44 1190 2783 26
SFS02006-4.8 20 6 3.175 36 58 10 50 47 44 1479 2952 33
SFS02008-4.8 20 8 3.175 36 58 10 60 47 44 1224 2912 33
SFS02010-3.8 20 10 3.175 36 58 10 60 47 44 996 2296 22
SFS02020-1.8 20 20 3.175 36 58 10 57 47 44 502 1053 10
SFS02020-2.8 20 20 3.175 36 58 10 77 47 44 734 1638 16
SFS02505-3.8 25 5 3.175 40 62 10 40 51 48 1084 2791 23
SFS02506-4.8 25 6 3.175 40 62 10 50 51 48 1324 3523 31
SFS02508-4.8 25 8 3.175 40 62 10 60 51 48 1320 3515 32
SFS02510-3.8 25 10 3.175 40 62 10 62 51 48 1076 2776 22
SFS02525-1.8 25 25 3.175 40 62 12 70 51 48 554 1318 12
SFS02525-2.8 25 25 3.175 40 62 12 95 51 48 810 2050 19
SFS03205-3.8 32 5 3.175 50 80 12 42 65 62 1209 3611 29
SFS03206-4.8 32 6 3.175 50 80 12 51 65 62 1476 4558 38
SFS03208-4.8 32 8 3.969 50 80 12 62 65 62 1881 5501 39
SFS03210-3.8 32 10 3.969 50 80 13 62 65 62 1617 4347 31
SFS03220-2.8 32 20 3.969 50 80 12 80 65 62 1253 3285 24
SFS03230-1.8 32 30 3.969 50 80 13 84 65 62 826 2053 15
SFS03232-2.8 32 32 3.969 50 80 13 116 65 62 1208 3193 23
SFS04005-3.8 40 5 3.175 63 93 15 45 78 70 1326 4547 35
SFS04006-4.8 40 6 3.175 63 93 14 50 78 70 1621 5742 44
SFS04008-4.8 40 8 3.969 63 93 14 61 78 70 2186 6885 46
SFS04010-3.8 40 10 6.35 63 93 14 63 78 70 3948 10047 43
SFS04020-2.8 40 20 6.35 63 93 14 82 78 70 3026 7721 35
SFS04040-1.8 40 40 6.35 63 93 15 105 78 70 1976 4790 22
SFS04040-2.8 40 40 6.35 63 93 15 145 78 70 2889 7452 33
SFS05005-3.8 50 5 3.175 75 110 15 45 93 85 1450 5171 40
SFS05010-3.8 50 10 6.35 75 110 18 68 93 85 4309 12864 51
SFS05012-3.8 50 12 6.35 75 110 18 75 93 85 4305 12852 52
SFS05020-2.8 50 20 6.35 75 110 18 100 93 85 4394 13320 55
SFS05050-1.8 50 50 6.35 75 110 18 125 93 85 2252 6305 27
SFS05050-2.8 50 50 6.35 75 110 18 175 93 85 3293 9807 41
SFS06310-3.8 63 10 6.35 90 125 18 70 108 95 4848 16795 61
SFS06316-3.8 63 16 6.35 90 125 18 95 108 95 4836 16762 64
SFS06320-3.8 63 20 7.144 95 135 20 116 115 100 5727 19040 67
SFS08010-3.8 80 10 6.35 105 145 20 70 125 110 5335 21302 69
SFS08020-3.8 80 20 9.525 125 165 25 120 145 130 9283 31416 82
SFS10020-3.8 100 20 12.7 150 202 30 124 176 155 15007 51455 97

Reproduced from the manufacturer catalogue, page 28. Shaft diameter and lead are read from the model designation, because the catalogue's printed shaft column uses merged cells; the remaining columns are as printed. Load is in kgf, stiffness K in kgf/µm.

Questions we are asked about the SFS series

Why do some screws have a decimal circuit count? The figure is the number of ball circuits actually built into the nut, so 3.8 circuits is a real nut, not a rounding. It is part of the part number and must be quoted with the size.

Is a smaller diameter with a big lead a sensible combination? Sometimes - it keeps the inertia and the cost down when the load is light and the stroke short. It is a geometry question, so send us the numbers rather than guessing from the table.

Which of the five series do you need?

SFS is where to look when the requirement does not fit the shape of the other four - an unusual diameter and lead pair, or a very large screw chosen for stiffness rather than for speed.

Narrow the SFS range down for your axis

Give us the load, the stroke, the speed and the space you have for the nut. With those four numbers the 45 models above usually come down to two or three, and we will tell you which.

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