Linear shafts / material selectable / treatment selectable / stepped on both sides / internal thread / spanner flat

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MISUMI

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(i)Remark

SFPH has been localized according to European needs and requirements. Please have a look on the EU version SFPHEU. SFPHEU is available in EN 1.1213 (Cf53) and h6 / h7.

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Technical Information

Back to Linear Shaft Category

Technical Drawing - Linear Shafts

Both Ends Stepped and Tapped with Wrench Flats:Related Image

Basic Properties (e.g. material, hardness, coating, tolerance) - Linear Shafts

Type			Material	Hardness	Surface Treatment
D Tol. g6	D Tol. h5	D Tol. f8	Material	Hardness	Surface Treatment
SFPH	SFHU	-	EN 1.3505 Equiv.	Effective Hardened Depth of Induction Hardening >>P.112 EN 1.3505 Equiv. 58HRC~ EN 1.4037 Equiv. 56HRC~	-
SSFPH	SSFHU	-	EN 1.4037 Equiv.		-
PSFPH	PSFHU	-	EN 1.3505 Equiv.		Hard Chrome Plating Plating Hardness: HV750 ~ Plating Thickness: 5µ or More
PSSFPH	PSSFHU	-	EN 1.4037 Equiv.
RSFPH	-	-	EN 1.3505 Equiv.		LTBC Plating
-	-	-	EN 1.4037 Equiv.		LTBC Plating
-	-	PFPGH	EN 1.1191 Equiv.	-	Hard Chrome Plating Plating Hardness: HV750 ~ Plating Thickness: 10µ or More
-	-	PSFPGH	EN 1.4301 Equiv.	-

Further specifications can be found under the tab More Information.

Composition of a Product Code - Linear Shafts

Part Number	-	L	-	F	-	P	-	M	-	T	-	SC
SFPH20	-	300	-	F25	-	P16	-	M10	-	T20	-	SC10
SFHU20	-	400	-	F25	-	P16	-	M10	-	T20	-	SC10

Alterations - Linear Shafts

Both Ends Stepped and Tapped with Wrench Flats:Related Image

You find further options in detail under Option Overview.

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Part Number
PFPGH8-[25-796/1]-F[2-24/1]-P6-M3-T[2-24/1]-SC[0-788/1]
PFPGH10-[25-796/1]-F[2-32/1]-P[6-8/1]-M[3,4,5]-T[2-32/1]-SC[0-788/1]
PFPGH12-[25-996/1]-F[2-40/1]-P[6-10/1]-M[3,4,5,6]-T[2-40/1]-SC[0-984/1]
PFPGH12-[25-996/1]-F[2-40/1]-P[6-10/1]-MD6-T[2-40/1]-SC[0-984/1]
PFPGH13-[25-996/1]-F[2-44/1]-P[6-11/1]-M[3,4,5,6,8]-T[2-44/1]-SC[0-964/1]
PFPGH13-[25-996/1]-F[2-44/1]-P[6-11/1]-MD[6,8]-T[2-44/1]-SC[0-964/1]
PFPGH15-[25-1196/1]-F[2-52/1]-P[6-13/1]-M[3,4,5,6,8,10]-T[2-52/1]-SC[0-990/1]
PFPGH15-[25-1196/1]-F[2-52/1]-P[6-13/1]-MD[6,8,10]-T[2-52/1]-SC[0-990/1]
PFPGH16-[25-1196/1]-F[2-56/1]-P[6-14/1]-M[3,4,5,6,8,10]-T[2-56/1]-SC[0-1190/1]
PFPGH16-[25-1196/1]-F[2-56/1]-P[6-14/1]-MD[6,8,10]-T[2-56/1]-SC[0-1190/1]
PFPGH18-[25-1196/1]-F[2-64/1]-P[8-16/1]-M[4,5,6,8,10,12]-T[2-64/1]-SC[0-1190/1]
PFPGH20-[25-1196/1]-F[2-68/1]-P[8-17/1]-M[4,5,6,8,10,12]-T[2-68/1]-SC[0-1190/1]
PFPGH20-[25-1196/1]-F[2-68/1]-P[8-17/1]-MD[6,8,10,12]-T[2-68/1]-SC[0-1190/1]
PFPGH25-[25-1196/1]-F[2-88/1]-P[8-22/1]-M[4,5,6,8,10,12,16]-T[2-88/1]-SC[2-1190/1]
PFPGH25-[25-1196/1]-F[2-88/1]-P[8-22/1]-MD[6,8,10,12,16]-T[2-88/1]-SC[2-1190/1]
PFPGH30-[25-1496/1]-F[2-108/1]-P[9-27/1]-M[5,6,8,10,12,16,20,24]-T[2-108/1]-SC[0-1485/1]
PFPGH30-[25-1496/1]-F[2-108/1]-P[9-27/1]-MD[6,8,10,12,16,20]-T[2-108/1]-SC[0-1485/1]
PFPGH35-[25-1496/1]-F[2-128/1]-P[9-32/1]-M[5,6,8,10,12,16,20,24]-T[2-128/1]-SC[0-1481/1]
PFPGH40-[25-1496/1]-F[2-148/1]-P[11-37/1]-M[6,8,10,12,16,20,24,30]-T[2-148/1]-SC[0-1476/1]
PFPGH50-[25-1496/1]-F[2-188/1]-P[11-47/1]-M[6,8,10,12,16,20,24,30]-T[2-188/1]-SC[0-1485/1]
PSFPGH8-[25-796/1]-F[2-24/1]-P6-M3-T[2-24/1]-SC[0-788/1]
PSFPGH10-[25-796/1]-F[2-32/1]-P[6-8/1]-M[3,4,5]-T[2-32/1]-SC[0-788/1]
PSFPGH12-[25-996/1]-F[2-40/1]-P[6-10/1]-M[3,4,5,6]-T[2-40/1]-SC[0-984/1]
PSFPGH13-[25-996/1]-F[2-44/1]-P[6-11/1]-M[3,4,5,6,8]-T[2-44/1]-SC[0-964/1]
PSFPGH15-[25-1196/1]-F[2-52/1]-P[6-13/1]-M[3,4,5,6,8,10]-T[2-52/1]-SC[0-990/1]
PSFPGH16-[25-1196/1]-F[2-56/1]-P[6-14/1]-M[3,4,5,6,8,10]-T[2-56/1]-SC[0-1190/1]
PSFPGH18-[25-1196/1]-F[2-64/1]-P[8-16/1]-M[4,5,6,8,10,12]-T[2-64/1]-SC[0-1190/1]
PSFPGH20-[25-1196/1]-F[2-68/1]-P[8-17/1]-M[4,5,6,8,10,12]-T[2-68/1]-SC[0-1190/1]
PSFPGH25-[25-1196/1]-F[2-88/1]-P[8-22/1]-M[4,5,6,8,10,12,16]-T[2-88/1]-SC[0-1190/1]
PSFPGH30-[25-1496/1]-F[2-108/1]-P[9-27/1]-M[5,6,8,10,12,16,20,24]-T[2-108/1]-SC[0-1485/1]
PSFPGH35-[25-1496/1]-F[2-128/1]-P[9-32/1]-M[5,6,8,10,12,16,20,24]-T[2-128/1]-SC[0-1481/1]
PSFPGH40-[25-1496/1]-F[2-148/1]-P[11-37/1]-M[6,8,10,12,16,20,24,30]-T[2-148/1]-SC[0-1476/1]
PSFPGH50-[25-1496/1]-F[2-188/1]-P[11-47/1]-M[6,8,10,12,16,20,24,30]-T[2-188/1]-SC[0-1476/1]

Minimum order quantity	Standard Shipping Days ?	RoHS	[D] Diameter (Shaft) (mm)	[L] Length (Shaft) (mm)	Material	Heat Treatment	Surface Treatment	ISO Tolerance	Hardness	[SC] Distance (wrench flat) (mm)	[F] Length (stud - offset - front side) (mm)	[P] Diameter (stepped - front side) (mm)	[T] Length (stud - stepped - back side) (mm)	[M] Size (thread - depth 2xM) (mm)	[MD] Size (thread - depth 3xM) (mm)
1	6 Days	10	8	25 ～ 796	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 788	2 ～ 24	6	2 ～ 24	3	-
1	6 Days	10	10	25 ～ 796	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 788	2 ～ 32	6 ～ 8	2 ～ 32	3 ～ 5	-
1	6 Days	10	12	25 ～ 996	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 984	2 ～ 40	6 ～ 10	2 ～ 40	3 ～ 6	-
1	6 Days	10	12	25 ～ 996	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 984	2 ～ 40	6 ～ 10	2 ～ 40	-	6
1	6 Days	10	13	25 ～ 996	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 964	2 ～ 44	6 ～ 11	2 ～ 44	3 ～ 8	-
1	6 Days	10	13	25 ～ 996	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 964	2 ～ 44	6 ～ 11	2 ～ 44	-	6 ～ 8
1	6 Days	10	15	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 990	2 ～ 52	6 ～ 13	2 ～ 52	3 ～ 10	-
1	6 Days	10	15	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 990	2 ～ 52	6 ～ 13	2 ～ 52	-	6 ～ 10
1	6 Days	10	16	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 56	6 ～ 14	2 ～ 56	3 ～ 10	-
1	6 Days	10	16	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 56	6 ～ 14	2 ～ 56	-	6 ～ 10
1	7 Days	10	18	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 64	8 ～ 16	2 ～ 64	4 ～ 12	-
1	6 Days	10	20	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 68	8 ～ 17	2 ～ 68	4 ～ 12	-
1	6 Days	10	20	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 68	8 ～ 17	2 ～ 68	-	6 ～ 12
1	6 Days	10	25	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	2 ～ 1190	2 ～ 88	8 ～ 22	2 ～ 88	4 ～ 16	-
1	6 Days	10	25	25 ～ 1196	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	2 ～ 1190	2 ～ 88	8 ～ 22	2 ～ 88	-	6 ～ 16
1	6 Days	10	30	25 ～ 1496	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1485	2 ～ 108	9 ～ 27	2 ～ 108	5 ～ 24	-
1	6 Days	10	30	25 ～ 1496	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1485	2 ～ 108	9 ～ 27	2 ～ 108	-	6 ～ 20
1	7 Days	10	35	25 ～ 1496	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1481	2 ～ 128	9 ～ 32	2 ～ 128	5 ～ 24	-
1	7 Days	10	40	25 ～ 1496	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1476	2 ～ 148	11 ～ 37	2 ～ 148	6 ～ 30	-
1	7 Days	10	50	25 ～ 1496	[Unalloyed Steel] EN 1.1191 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1485	2 ～ 188	11 ～ 47	2 ～ 188	6 ～ 30	-
1	4 Days	10	8	25 ～ 796	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 788	2 ～ 24	6	2 ～ 24	3	-
1	4 Days	10	10	25 ～ 796	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 788	2 ～ 32	6 ～ 8	2 ～ 32	3 ～ 5	-
1	4 Days	10	12	25 ～ 996	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 984	2 ～ 40	6 ～ 10	2 ～ 40	3 ～ 6	-
1	4 Days	10	13	25 ～ 996	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 964	2 ～ 44	6 ～ 11	2 ～ 44	3 ～ 8	-
1	4 Days	10	15	25 ～ 1196	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 990	2 ～ 52	6 ～ 13	2 ～ 52	3 ～ 10	-
1	4 Days	10	16	25 ～ 1196	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 56	6 ～ 14	2 ～ 56	3 ～ 10	-
1	7 Days	10	18	25 ～ 1196	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 64	8 ～ 16	2 ～ 64	4 ～ 12	-
1	4 Days	10	20	25 ～ 1196	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 68	8 ～ 17	2 ～ 68	4 ～ 12	-
1	4 Days	10	25	25 ～ 1196	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1190	2 ～ 88	8 ～ 22	2 ～ 88	4 ～ 16	-
1	4 Days	10	30	25 ～ 1496	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1485	2 ～ 108	9 ～ 27	2 ～ 108	5 ～ 24	-
1	7 Days	10	35	25 ～ 1496	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1481	2 ～ 128	9 ～ 32	2 ～ 128	5 ～ 24	-
1	7 Days	10	40	25 ～ 1496	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1476	2 ～ 148	11 ～ 37	2 ～ 148	6 ～ 30	-
1	7 Days	10	50	25 ～ 1496	[Stainless Steel (austenitic)] EN 1.4301 Equiv.	No Treatment	Hard Chrome Plating	f8	No Induction Hardening	0 ～ 1476	2 ～ 188	11 ～ 47	2 ～ 188	6 ～ 30	-

Back to Linear Shaft Category

Technical Drawing - Linear Shafts

Specification Tables - Linear Shafts

Overview of the shaft designs as PDF

D Tol.
D	g6	h5	f8
8	-0.005 -0.014	0 -0.006	-0.013 -0.035
10
12	-0.006 -0.017	0 -0.008	-0.016 -0.043
13
15
16
18
20	-0.007 -0.020	0 -0.009	-0.020 -0.053
25
30
35	-0.009 -0.025	0 -0.011	-0.025 -0.064
40
50

Part Number			1mm Increment			M (Coarse) Selection											Wrench Flats Dimensions			(Y)Max.	R	C
Type		D	L	F, T	P	M (Coarse) Selection											SC	W	ℓ₁	(Y)Max.	R	C
(D Tolerance g6) SFPH SSFPH PSFPH PSSFPH RSFPH (D≤30, L≤500) (D Tolerance f8) PFPGH PSFPGH	(D Tolerance h5) SFHU SSFHU PSFHU PSSFHU	8	25~796	2≤F≤Px4 2≤T≤Px4	6	3											SC=1mm Increment SC+ℓ₁≤L SC≥0 Details of Wrench Flats >>P.112	7	8	800	0.3 or Less	0.5 or Less
		10	25~796		6~ 8	3	4	5										8	8	800
		12	25~996		6~10	3	4	5	6									10	10	1000
		13	25~996		6~11	3	4	5	6	8								11		1000
		15	25~996		6~13	3	4	5	6	8	10							13		1000
		16	25~1196		6~14	3	4	5	6	8	10							14		1200
		18	25~1196		8~16		4	5	6	8	10	12						16		1200
		20	25~1196		8~17		4	5	6	8	10	12						17		1200		1.0 or Less
		25	25~1196		8~22		4	5	6	8	10	12	16					22		1200
		30	25~1496		9~27			5	6	8	10	12	16	20	24			27	15	1500
		35	25~1496		9~32			5	6	8	10	12	16	20	24			30	15	1500	0.5 or Less
		40	25~1496		11~37				6	8	10	12	16	20	24	30		36	20	1500
		50	25~1496		11~47				6	8	10	12	16	20	24	30		41	20	1500

P dimensions require M+3≤P. (Y) dimensions require Mx4≤(Y). Tap pilot holes may go through.

Alterations - Linear Shafts

Both Ends Stepped and Tapped with Wrench Flats:Related Image

You find further options in detail under Option Overview.

Products homepage

Basic information

Basic Shape	Solid, Both Ends Stepped	Shaft end Shape (Left)	Internal thread	Shaft end Shape (Right)	Internal thread
Shaft end Perpendicularity	0.2

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Basic Attributes

[D] Diameter (Shaft)(mm)
8

10

12

13

15

16

18

20

25

30

35

40

50
Clear
[L] Length (Shaft)(mm)
[25-1496/1mm Unit(s)]
Clear
Material
- Unalloyed Steel
  - EN 1.1191 Equiv.
- Stainless Steel (austenitic)
  - EN 1.4301 Equiv.
- Alloyed Steel
  - EN 1.3505 Equiv.
- Stainless Steel (martensitique)
  - EN 1.4037 Equiv.
Clear
Surface Treatment
- No Treatment
- Hard Chrome Plating
- LTBC Plating
Clear
ISO Tolerance
f8

g6

h5
Clear
Hardness
- Induction Hardening (56HRC~)
- Induction Hardening (58HRC~)
- No Induction Hardening
Clear
[SC] Distance (wrench flat)(mm)
[0-1485/1mm Unit(s)]
Clear
[F] Length (stud - offset - front side)(mm)
[2-188/1mm Unit(s)]
Clear
[P] Diameter (stepped - front side)(mm)
6
[6-47/1mm Unit(s)]
Clear
[T] Length (stud - stepped - back side)(mm)
[2-188/1mm Unit(s)]
Clear
[M] Size (thread - depth 2xM)(mm)
3

4

5

6

8

10

12

16

20

24

30
Clear
[MD] Size (thread - depth 3xM)(mm)
6

8

10

12

16

20
Clear
Type
- PFPGH
- PSFHU
- PSFPGH
- PSFPH
- PSSFHU
- PSSFPH
- RSFPH
- SFHU
- SFPH
- SSFHU
- SSFPH
Clear
Heat Treatment
- No Treatment
- Induction Hardened
Clear
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Optional Attributes

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently Asked Questions (FAQ)

Question:
What is the difference between a hollow shaft and a solid shaft?: Answer:
With the same size, there are three differences between a hollow shaft and a solid shaft. Hollow shafts weigh less. The inner cavity of a hollow shaft is suitable for use as a channel (cable channel). Solid shafts are a bit more rigid (higher resistance torque).
Question:
What is the minimum order of linear shafts from MISUMI?: Answer:
MISUMI supplies solid shafts, hollow shafts and precision shafts starting at a lot size of 1. This also applies to all other items in our product range.
Question:
Noises and vibrations occur with a linear shaft. In addition, there are jerky movements. What could cause this?: Answer:
In general, it may be caused if the steel shaft is not properly lubricated. In addition, an incorrectly selected diameter tolerance of the linear shafts may also make the cycle of motion more difficult. When using MISUMI linear ball bearings, a g6 shaft tolerance is recommended (tolerance recommendations may vary depending on the manufacturer).
Question:
What is the strength of a solid shaft?: Answer:
The strength of a linear shaft, although it is a solid shaft, hollow shaft or precision shaft, should always be selected in consideration of the strength of the material used.
Question:
What are the advantages of a hollow shaft over a solid shaft?: Answer:
There are various advantages of a hollow shaft compared to a solid shaft. If the outer diameter is the same, the weight of a hollow shaft is lower than that of a solid shaft. However, the cavity of the hollow shaft can also be used as a cable channel or for cooling. A hollow shaft is at the same weight or with the same cross-sectional area more rigid than a solid shaft, because the outer diameter is larger. However, the question that needs to be answered is whether the advantage is a greater room utilization or less weight.
Question:
Is a hollow shaft stiffer than a solid shaft?: Answer:
The rigidity of a hollow shaft is slightly lower with the same outer diameter than that of a solid shaft. However, with the same cross-sectional area or with the same weight, the stiffness of a hollow shaft is higher than that of a solid shaft, because the outer diameter of the hollow shaft is larger.
Question:
Why do I have running grooves on the linear shafts of my 3D printers?: Answer:
The running grooves on the linear shaft may have been created, for example, by using a linear ball bearing. To prevent grooves from forming on a steel shaft, it should be hardened and hard chromium plated, making it more durable and resistant to the wear and tear from ball bearings.
Question:
How do the flexure properties of hollow shafts and solid shafts differ?: Answer:
With an equally large outer diameter, a solid shaft has better flexure properties than an equally large hollow shaft. However, the solid shaft is not much stiffer than a hollow shaft with the same outer diameter, since the outer sections mainly carry the load. Hollow shafts with the same cross-sectional area are more rigid than solid shafts, because they have a larger outer diameter. Therefore, there is physically more material in the outer sections for the bending, which bears the loads.
Question:
I need a lacquered or matted shaft because reflections cause problems with the optics. Does MISUMI have something like that?: Answer:
MISUMI LTBC-coated linear shafts are an alternative to painted or matted steel shafts. The LTBC coating is low-reflection and has the same effect as painted and matte shafts. In addition, LTBC-coated linear shafts are more resistant to wear and tear and flaking. You can find further information on LTBC coating here .
Question:
It has been shown that a hollow shaft is stronger than a solid shaft made of the same material. Why?: Answer:
A hollow shaft with the same outer dimensions is principally not stronger than a solid shaft. However, a hollow shaft per weight unit is stronger.