Ball Splines / Both Ends Tapped

	Flange type nut orientation ● 1-Nut Type	● 2-Nut Type
[ ! ] When selecting Overall Length (L Dimension), check the annealing range.
[ ! ] For the included nut, please select a shape from below.

 

■Round Flanged

 

■Compact Flanged

 

■Straight Nuts
	[A]Dimension of Included Key

[ ! ] Do not machine the nut as it will adversely affect accuracy.
[ ! ] The key is press fit into the nut.

One End Tapped	Spline Shaft [M] EN 1.3505 Equiv., Nut [M] EN 1.7242 Equiv. [H]Hardness: 58HRC or more	Spline Shaft and Nut [M] Material: EN 1.4125 Equiv. [H]Hardness: 55 HRC or more
	Nut 1 pc.	Nut 1 pc.
With Round Flange Nut	BSFM	BSFMS
With Compact Flange Nut	BSFN	—
With Straight Nut	BSFS	BSFSS

[ ! ] Hardening of this product is induction hardening. (Depth: Approx. 1 mm to 2 mm)

[ ! ] Spline Shafts are hardened, and need to be annealed before machining.

[ ! ] As the accuracy is guaranteed as a set of nut and shaft, they are not sold separately.

[ ! ] A dust-proof seal is attached to the nut, so the balls will not fall off even if the spline shaft is pulled out.
(If the spline shaft is inserted at an angle to the nut, the ball may fall out.)

Part Number	—	L	—	M
BSFS10 BSFS10G BSFS10L	— — —	350 350 350	— — —	M5 M5 M5

Alternative grease types are available.

■Spline Shafts

Part Number		L: 1 mm Increments	M (Coarse) Selection								D	Mass (kg/m)
Type	No.	1-Nut Type
BSFM BSFN BSFS BSFMS BSFSS	* 6	60 to 500 (190)	3								6	0.23
	* 8	60 to 600 (190)	3	4							8	0.39
	* 10	60 to 800 (390)	3	4	5						10.4	0.65
	* 13	60 to 800 (390)		4	5	6					13.4	1.11
	* 16	70 to 1000 (390)		4	5	6	8				16.6	1.65
	20	80 to 1000			5	6	8	10			20.6	2.57
	25	90 to 1300			5	6	8	10	12		25.8	4.04
	30	100 to 1300				6	8	10	12	16	30.8	5.85

[ ! ] For BSFMS and BSFSS, only * marked sizes are available, and the Max. L dimension is in ( ).
[ ! ] For BSFN, only No. 6, 8 and 10 are available.
[ ! ] Operating Temp.: Plastic components are used in ball spline assemblies. Avoid using in high temperature environments: keep below 80°C.

[ ! ] Lubrication: Ball splines are lubricated at the time of shipment, but should be re-lubricated after installation in equipment.
After you start using the vehicle, fill the grease every 100 km.
For re-lubrication, Lithium soap-based grease (Alvania Grease S2 by Showa Shell Sekiyu) is recommended.

■Round Flange Nuts, Compact Flange Nuts

No.	D (h6)	L	df	H	P.C.D.	d1	d2	h	W	d	B	Basic Rated Torque		Basic Load Rating		Allowable Static Moment		Mass (kg)
												Dynamic Ct (N⋅m)	Static C0 t (N⋅m)	Dynamic C (kN)	Static C0 (kN)	M01 (N⋅m)	M02 (N⋅m)
6	14	25	30	6	22	3.5	6	3.1	6.5	1.5	18	3.8	7	1.2	2.1	5	36	0.03
8	16		32		24						21	4.8	8.7	1.2	2.1	5	36	0.04
10	21	40 (33)	42 (41)	6 (8)	32 (30)	4.5	8	4.4 (5.3)	14 (8.5)		25	19 (11)	34 (21)	3.8 (2.4)	6.9 (4.3)	26 (15)	181 (102)	0.09
13	24	44 (36)	44 (45)	7 (8)	33 (34)				15 (10)		—	28 (20)	52 (37)	4.6 (3.3)	8.3 (5.9)	36 (22)	251 (148)	0.11
16	31	50	51	7	40			4.4	18			51	93	6.2	11.1	56	386	0.2
20	35	63	58	9	45	5.5	9.5	5.4	22.5	2		85	154	8.5	15.3	83	611	0.3
25	42	71	65		52				26.5			193	348	15.4	27.7	173	1248	0.4
30	47	80	75	10	60	6.6	11	6.5	30	2.5		272	490	18.5	33.3	212	1581	0.57

[!] Dimensions in () are for EN 1.4125 Equiv. [!] Allowable static moment M₀₁ are values measured when a single nut is used, and M₀₂ are values measured when two nuts are used in contact.

■Straight Nuts

No.	D (h6)	L	b		t (+0.05 0)	d	α	Basic Rated Torque		Basic Load Rating		Allowable Static Moment		Mass (kg)	Dimensions of Key (Included)
				Tolerance				Dynamic Ct (N⋅m)	Static C0 t (N⋅m)	Dynamic C (kN)	Static C0 (kN)	M01 (N⋅m)	M02 (N⋅m)		B		h		L1	R
																Tolerance		Tolerance
6	14	25	2.5	+0.014 0	1.2	1.5	15°	3.8	7	1.2	2.1	5	36	0.012	2.5	+0.016 +0.006	2.5	0 −0.025	10.5	1.25
8	16						25°	4.8	8.7	1.2	2.1	5	36	0.013					10.5
10	21	40 (33)	3		1.5		—	19 (11)	34 (21)	3.8 (2.4)	6.9 (4.3)	26 (15)	181 (102)	0.06	3		3		17 (14)	1.5
13	24	44 (36)						28 (20)	52 (37)	4.6 (3.3)	8.3 (5.9)	36 (22)	251 (148)	0.07					17 (14)
16	31	50	3.5	+0.018 0	2			51	93	6.2	11.1	56	386	0.15	3.5	+0.024 +0.012	3.5	0 −0.030	18	1.75
20	35	63	4		2.5	2		85	154	8.5	15.3	83	611	0.2	4		4		29	2
25	42	71						193	348	15.4	27.7	173	1248	0.29					33
30	47	80				2.5		272	490	18.5	33.3	212	1581	0.37					42

[!] Dimensions in () are for EN 1.4125 Equiv. [!] Allowable static moment M₀₁ are values measured when a single nut is used, and M₀₂ are values measured when two nuts are used in contact.

Alterations	Wrench Flats	Set Screw Flat	Additional Spline Nuts
Code	SC	FC	NTW
Spec.	Adds a wrench flat.    SC = 1 mm Increments [ ! ] SC+ℓ1 ≤ L No. W ℓ1 6 5 8 8 7 10 8 13 11 10 16 14 20 17 25 22 15 30 27	Adds a set screw flat. Ordering Code FC10-A8 FC, A = 1 mm Increments [ ! ] FC ≤ 3 × D [ ! ] 1.5 × D < FC When 1.5 x D < FC, FC ≤ L/2 [ ! ] A = 0 or A ≥ 2 No. h 6 1 8 10 13 16 20 2 25 30	Adds a nut. (from one to two) [ ! ] BSFS·BSFM Applicable to BSFN only

[ ! ] When selecting multiple alterations, the distance between machined areas should be 2 mm or more.
[ ! ] The angles / positions of alterations such as wrench flats, set screw flat, and keyway are not on the same plane.
[ ! ] It is not possible to specify the key of the spline nut or the positional relationship between the mounting hole and alteration.