BOSCH REXROTH
R151217055

$688.91 USD

BOSCH REXROTH
Material:R151217055
Model:SEM-E-C 20X20RX3,5-3

Quantity in stock: 0

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***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth SEM-E-C 20X20RX35-3 (R151217055) is a high-precision ball screw assembly designed for linear motion applications requiring meticulous control and reliability. This adjustable preload single nut SEMEC is crafted to deliver exceptional performance with a nominal diameter of 20 mm and a lead of 20 mm, suitable for right-hand thread direction. It features a flange type C mounting, which aligns with DIN standards, ensuring compatibility and ease of integration into various mechanical setups. The SEM-E-C 20X20RX35-3 is equipped with standard seals and standard axial clearance, maintaining its operational integrity by protecting against contaminants. The ball screw assembly is designed to tolerate a dynamic load capacity (C) and static load rating (C0), both specified for tolerance grades T3 and T7. Users should note that these capacities are applicable only to these tolerance grades; other grades may require adjustments based on the correction factor fsubacsub. This product operates within a temperature range of -10°C to +80°C, sustaining continuous use at temperatures up to +80°C and accommodating temporary peaks up to +100°C without compromising performance. The maximum permissible linear speed (vmax) is denoted in the technical specifications, ensuring users can optimize the speed according to their application requirements. The SEM-E-C 20X20RX35-3 boasts an adjustable preload feature enabling zero-clearance operation, which is critical for applications demanding high precision and rigidity. Its design includes multiple circuits of ball tracks that enhance load-bearing capabilities while minimizing frictional resistance. With its robust construction and reliable performance, this Bosch Rexroth ball screw nut stands out as an essential component for sophisticated linear motion systems where accuracy and durability are paramount. The unit's weight and size dimensions are provided in the product overview, facilitating selection based on specific design criteria or space constraints within mechanical assemblies.

Adjustable-preload single nut SEM-E-C, size 20 x 20R x 3.5 - 3

Adjustable-preload single nut SEM-E-C with standard seal and standard axial clearance
Nominal diameter d0 = 20
Lead P = 20 (right)
Ball diameter Dw = 3.5
Number of ball track turns i = 3

Unpacked Weight: 0.670 kg

Product overview

Mounting dimensions similar to DIN 69051, Part 5 flange type C
With seals
Adjustable preload
Tolerance grade: T3 (for sizes as per the product overview for screws, see General Technical Notes and Information "Product description"), T5, T7

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Manual	Download Manual
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Manual	Download Manual

Size D5	58
Size L with tolerance	77 mm
Bearing temperature max	+80
Series	Standard series
Bearing temperature min	-15
Nut or screw	Screw drive nut
Maximum operating temperature	+80
Footnote dynamic load capacity C	The load capacities are valid for tolerance grade T3 and T5 only. For other tolerance grades, please take into account the correction factor f_ac (see General Technical Notes and Information "Technical Data", Technical Notes).
Bearing temperature	-15 °C ... +80 °C
Category	B
Minimum operating temperature	-10
Size L4	25
Size D6	47
Size D1 f9	36
Size D1 min	35.945
Size L3	20
Size L9	51
Size L10	28.5
Size D1 max	35.973
Operating temperature	-10 °C ... +80 °C
Maximum permissible linear speed vmax (m/min)	120
Direction of lead	Right
Size L8	12.5
Lead	20
Footnote static load capacity C0	The load capacities are valid for tolerance grade T3 and T5 only. For other tolerance grades, please take into account the correction factor f_ac (see General Technical Notes and Information "Technical Data", Technical Notes).
Size L5	28.5
Static load rating C0	18800
Note: Maximum permissible speed vmax	See "Characteristic speed d₀• n" (see General Technical Notes and Information, "Technical Data" (Technical Notes), and "Critical speed n_cr" (see General Technical Notes and Information, "Project planning notes")
Nut type	SEM-E-C zero-clearance adjustable single nut
Productgroup ID	17
Screw drive version (drive type)	Ball screw assembly
Size D7	6.6
Hole pattern	BB2
Size Sx	4
Footnote permissible operating temperature (min...max)	Ball screw assemblies permit operation at continuous temperatures of up to 80 °C with temporary peaks of 100 °C, measurements taken on the outer shell of the nut in each case.
Dynamic load capacity C	16000
Size d1	19
Size L	77
Size d2	16.7
Footnote operating temperature max.	Ball screw assemblies permit operation at continuous temperatures of up to 80°C with temporary peaks of 100°C, measurements taken on the outer shell of the nut in each case.
Weight	0.670
Nominal size	20 x 20R x 3,5 - 3

Technical data for nuts

Size	C	C0	vmax	Mass
d0 x P x Dw - i	N	N	m/min	kg
16 x 5R x 3 - 4	14800 1)	16100 1)	30 2)	0.2
16 x 10R x 3 - 3	11500 1)	12300 1)	60 2)	0.22
16 x 16R x 3 - 3	11200 1)	12000 1)	96 2)	0.29
20 x 5R x 3 - 4	17200 1)	21500 1)	30 2)	0.33
20 x 20R x 3,5 - 3	16000 1)	18800 1)	120 2)	0.56
25 x 5R x 3 - 4	19100 1)	27200 1)	30 2)	0.43
25 x 10R x 3 - 4	18800 1)	27000 1)	60 2)	0.54
25 x 25R x 3,5 - 3	17600 1)	23300 1)	150 2)	0.77
32 x 5R x 3,5 - 4	25900 1)	40000 1)	23 2)	0.74
32 x 10R x 3,969 - 5	38000 1)	58300 1)	47 2)	0.97
32 x 20R x 3,969 - 3	23600 1)	33700 1)	94 2)	1.04
32 x 32R x 3,969 - 3	23400 1)	34000 1)	150 2)	1.34
40 x 5R x 3,5 - 5	34900 1)	64100 1)	19 2)	1.25
40 x 10R x 6 - 4	60000 1)	86400 1)	38 2)	1.39
40 x 12R x 6 - 4	59900 1)	86200 1)	45 2)	1.47
40 x 20R x 6 - 3	45500 1)	62800 1)	75 2)	1.55
40 x 40R x 6 - 3	44400 1)	62300 1)	150 2)	2.69
50 x 5R x 3,5 - 5	38400 1)	81300 1)	15 2)	1.67
50 x 10R x 6 - 6	95600 1)	166500 1)	30 2)	2.46
50 x 12R x 6 - 6	95500 1)	166400 1)	36 2)	2.69
50 x 20R x 6,5 - 5	90800 1)	149700 1)	60 2)	3.08
50 x 40R x 6,5 - 3	55800 1)	85900 1)	120 2)	3.39
63 x 10R x 6 - 6	106600 1)	214300 1)	24 2)	2.83
63 x 20R x 6,5 - 5	100700 1)	190300 1)	48 2)	4.86
63 x 40R x 6,5 - 3	64100 1)	114100 1)	95 2)	5.36
80 x 10R x 6,5 - 6	130100 1)	291700 1)	19 2)	3.73
80 x 20R x 12,7 - 6	315200 1)	534200 1)	30 2)	13.5

1)	The load ratings are valid for tolerance grades T3 and T5 only. For other tolerance grades, please take into account the correction factor fac (see General Technical Notes and Information "Technical Data", Technical Notes).
2)	See "characteristic speed d0 • n" (see General Technical Notes and Information "Technical Data" (Technical Notes), and "Critical Speed ncr" (see General Technical Notes and Information, "Project planning notes")

Operating conditions

Size	Admissible operating temperature (min ... max) 1)	Admissible storage temperature (min ... max)
d0 x P x Dw - i	Admissible operating temperature (min ... max) 1)	Admissible storage temperature (min ... max)
16 x 5R x 3 - 4	-10 °C ... +80 °C	-15 °C ... +80 °C
16 x 10R x 3 - 3
16 x 16R x 3 - 3
20 x 5R x 3 - 4
20 x 20R x 3,5 - 3
25 x 5R x 3 - 4
25 x 10R x 3 - 4
25 x 25R x 3,5 - 3
32 x 5R x 3,5 - 4
32 x 10R x 3,969 - 5
32 x 20R x 3,969 - 3
32 x 32R x 3,969 - 3
40 x 5R x 3,5 - 5
40 x 10R x 6 - 4
40 x 12R x 6 - 4
40 x 20R x 6 - 3
40 x 40R x 6 - 3
50 x 5R x 3,5 - 5
50 x 10R x 6 - 6
50 x 12R x 6 - 6
50 x 20R x 6,5 - 5
50 x 40R x 6,5 - 3
63 x 10R x 6 - 6
63 x 20R x 6,5 - 5
63 x 40R x 6,5 - 3
80 x 10R x 6,5 - 6
80 x 20R x 12,7 - 6

1)	Ball screw assemblies are suitable for continuous operation at temperatures up to 80 °C with temporary peaks of 100 °C (measurements taken on the outer shell of the nut).

Legend

Symbol	Description	Unit
d0	Nominal diameter	mm
P	Lead (R = right-hand)
Dw	Ball diameter	mm
i	Number of ball track turns
C	Dynamic load capacity	N
C0	Static load capacity	N
vmax	Maximum permissible speed	m/min

Technical notes

technical illustration-R151217055-Adjustable-preload single nut SEM-E-C, size 20 x 20R x 3.5 - 3

1)	Lube port (lube port machining: Flat surface L3 ≤ 15 mm, countersink L3 > 15 mm)
2)	Nut rework: Axial lube port

Dimensions

Size	D1 min	D1 max	d1	d2	D1	D5	Hole pattern	D6	D7	L	L3	L4	L5	L8	L9	L10	S 1)	Sx
d0 x P x Dw - i	D1 min	D1 max	d1	d2	f9	D5	Hole pattern	D6	D7	L	L3	L4	L5	L8	L9	L10	S 1)	Sx
d0 x P x Dw - i	mm	mm	mm	mm	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16 x 5R x 3 - 4	27.94	27.975	15	12.9	28	48	BB2	38	5.5	38	15	10	11.5	7.1	44	11.5	M6	4
16 x 10R x 3 - 3	27.94	27.975								45		15	15	11		15
16 x 16R x 3 - 3	27.95	27.978								61		20	23	10		23
20 x 5R x 3 - 4	35.935	35.97	19	16.9	36	58		47	6.6	40		10	12.5	7.1	51	12.5
20 x 20R x 3,5 - 3	35.945	35.973	19	16.7	36	58		47		77	20	25	28.5	12.5	51	28.5
25 x 5R x 3 - 4	39.935	39.97	24	21.9	40	62		51		45		10	12.5	9.5	55	12.5
25 x 10R x 3 - 4	39.935	39.97		21.9						64		16	22	10		22
25 x 25R x 3,5 - 3	39.945	39.973		21.4						95	25	30	35	14		35
32 x 5R x 3,5 - 4	49.935	49.97	31	28.4	50	80		65	9	48	20	10	14	9.7	71	14
32 x 10R x 3,969 - 5	49.935	49.97		27.9						77		16	28.5	12.5		28.5
32 x 20R x 3,969 - 3	49.945	49.973								84		25	32			32
32 x 32R x 3,969 - 3	49.945	49.973								120		40	50			50
40 x 5R x 3,5 - 5	62.931	62.966	39	36.4	63	93	BB1	78		54	25	10	14.5	12	81.5	14.5	M8x1	5
40 x 10R x 6 - 4			38	33.8						70		16	22.5	11.8		22.5
40 x 12R x 6 - 4										75		25	25	12.5		25
40 x 20R x 6 - 3	62.941	62.969								88		25	31.5	16.5		31.5
40 x 40R x 6 - 3	62.941	62.969								142	40	45	51	25		51
50 x 5R x 3,5 - 5	74.931	74.966	49	46.4	75	110		93	11	54	25	10	14.5	12	97.5	14.5
50 x 10R x 6 - 6			48	43.8						90	30	16	30	14.1		30
50 x 12R x 6 - 6				43.8						105		25	37.5	15		37.5
50 x 20R x 6,5 - 5	74.941	74.969		43.4						132		25	51	20		51
50 x 40R x 6,5 - 3	74.941	74.969		43.4						149		45	59.5	18		59.5
63 x 10R x 6 - 6	89.926	89.961	61	56.8	90	125		108		90		16	30	14	110	30
63 x 20R x 6,5 - 5	94.936	94.964		56.4	95	135		115	13.5	132		25	51	20	117.5	51
63 x 40R x 6,5 - 3	94.936	94.964		56.4	95	135		115		149		45	59.5	18	117.5	59.5
80 x 10R x 6,5 - 6	104.926	104.961	78	73.3	105	145		125		95		16	32.5	14	127.5	32.5
80 x 20R x 12,7 - 6	124.931	124.959	76	67	125	165		145		170	50	25	60	24	147.5	60

1)	Lube port machining: Flat surface L3 ≤ 15 mm, countersink L3 > 15 mm

Legend

Symbol	Description	Unit
d0	Nominal diameter	mm
P	Lead (R = right-hand)
Dw	Ball diameter	mm
i	Number of ball track turns

Calculation

Installation

Attention: When setting up applications, do not allow components to collide with the front lube unit.

Lubrication

Nut housing MGD

Steel nut housings MGD are designed for FEM-E-C, FDM-E-C, SEM-E-C and FED-E-B nuts

Catalog

Service

CAD data

Directives and standards

Required and supplementary documentation

For further instructions and information, please refer to the documentation for this product.

You can find PDF files of these documents on the Internet at www.boschrexroth.com/mediadirectory.

If you are unsure about using this product, please contact Bosch Rexroth.

Notes