Precision Linear Shafts - One End Male Thread One End Female Thread Type with Undercut - Wrench Flat Type

Brand :

MISUMI

Caution

Product Description

[Features] One end male thread, one end female thread, relief groove, spanner groove/drilled hole type shaft (linear shaft, hardened shaft, guide shaft, slide shaft). L size standard expanded! You can now purchase from an even more complete lineup.

Precision Linear Shafts, One End Male / One End Female Thread, Undercut with Wrench Flat or Drilled Hole

Linear shafts with a male thread with relief groove at one end and a female thread at the other, plus a wrench flat or a drilled hole for tightening. Used as hardened, guide and slide shafts.

Two end configurations: wrench flat type, and drilled hole type (D ≤ 30, L ≤ 500).
L, F, SC and H dimensional tolerances conform to JIS B0405 class m. SC and H are specified in 1 mm increments.
D surface roughness differs between plated and non-plated items.

Material, surface treatment and hardness

Surface roughness of part D differs between plated and unplated items.
Tolerances of dimensions L, F, SC and H conform to JIS B 0405 m class.

Type					Material	Hardness	Surface treatment
With wrench flats			With drilled hole
D tolerance g6	D tolerance h5	D tolerance f8	D tolerance g6	D tolerance f8
SAFZ	SFBU	-	SAHD	-	SUJ2 equivalent	Induction hardened (effective hardened depth: see table) SUJ2 equivalent 58HRC min. SUS440C or 13Cr stainless steel 56HRC min.	-
SSAFZ	SSFBU	-	SSAHD	-	SUS440C or 13Cr stainless steel		-
PSAFZ	PSFBU	-	PSAHD	-	SUJ2 equivalent		Hard chrome plating Plating hardness HV750 min. Plating thickness 5 μm min.
PSSAFZ	PSSFBU	-	PSSAHD	-	SUS440C or 13Cr stainless steel
RSAFZ	-	-	RSAHD	-	SUJ2 equivalent		Low-temperature black chrome plating
RSSAFZ	-	-	RSSAHD	-	SUS440C or 13Cr stainless steel		Low-temperature black chrome plating
-	-	PSAGZ	-	PSHGD	S45C equivalent	-	Hard chrome plating Plating hardness HV750 min. Plating thickness 10 μm min.
-	-	PSSAGZ	-	-	SUS304	-

Low-temperature black chrome plated SUS440C or 13Cr stainless steel items have an identification groove.
Hard chrome plated items are machined after plating, so machined areas are not plated.

Part numbers and dimensions

Ordering example

Type	-	L	-	F	-	M	-	N	-	SC	-	H
SAFZ20	-	277	-	F25	-	M10	-	N12	-	SC10
SSAHD20	-	277	-	F25	-	M12	-	N12			-	H10

D tolerance
D	g6	h5	f8
8	-0.005 -0.014	0 -0.006	-0.013 -0.035
10	-0.005 -0.014	0 -0.006	-0.013 -0.035
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

Type				1 mm increments		M (coarse) Selection									N (coarse) Selection											Wrench flat dimensions			Drilled hole dimensions		(Y) Max.	C
Type			D	L	F	M (coarse) Selection									N (coarse) Selection											SC	W	ℓ1	H	d	(Y) Max.	C
(With wrench flats)		(With drilled hole) D ≤ 30, L ≤ 500	8	25–1095	5≤F≤M×3 F-g≥Pitch×3	5	6								3	4	5									SC: specify in 1 mm increments SC+ℓ1 ≤ L SC ≥ 0	7	8	H: specify in 1 mm increments L ≥ H+d/2+6+N×2.5 H ≥ d/2+2	3	1100	0.5 or less
(With wrench flats)		(With drilled hole) D ≤ 30, L ≤ 500	10	25–1195		5	6	8							3	4	5	6									8	8			1200
D tolerance g6 SAFZ SSAFZ PSAFZ PSSAFZ RSAFZ (D ≤ 30, L ≤ 500) D tolerance f8 PSAGZ PSSAGZ	D tolerance h5 SFBU SSFBU PSFBU PSSFBU	D tolerance g6 SAHD SSAHD PSAHD PSSAHD RSAHD D tolerance f8 PSHGD	12	25–1395		5	6	8	10						(3)	4	5	6	8								10	10			1400
			13	25–1395		5	6	8	10	12					(3)	4	5	6	8								11			4	1400
			15	25–1395		5	6	8	10	12					(3)	4	5	6	8	10							13				1400
			16	25–1395		5	6	8	10	12						4	5	6	8	10							14				1400
			18	25–1395		5	6	8	10	12	16					4	5	6	8	10	12						16			6	1400
			20	25–1395		5	6	8	10	12	16					4	5	6	8	10	12						17			6	1400	1.0 or less
			25	25–1395		5	6	8	10	12	16	20	24			4	5	6	8	10	12	16					22			7	1400
			30	25–1495			6	8	10	12	16	20	24					6	8	10	12	16	20				27	15		7	1500
			35	25–1492					10	12	16	20	24	30					8	10	12	16	20	24			30	15		-	1500
Low-temperature black chrome plated items: D ≤ 30, Y ≤ 1000.			40	40–1490						12	16	20	24	30						10	12	16	20	24	30		36	20			1500
Drilled-hole types: D ≤ 30, L ≤ 500.			50	50–1490							16	20	24	30							12	16	20	24	30		41	20			1500

Dimension N ( ) can be selected only with D tolerance g6.
Overall length L must satisfy N×2.5+4 ≤ L.

Coarse thread relief dimensions
M	Pitch	MC	(g)
5	0.8	4.1	2
6	1.0	4.4	2
8	1.25	6.0	3
10	1.5	7.7	3
12	1.75	9.4	4
16	2.0	13.0	4
20	2.5	16.4	5
24	3.0	19.6
30	3.5	25.0

Male thread C chamfer details

Nominal thread M	Pitch P	Chamfer C (reference)
3	0.50	0.50
4	0.70	0.75
5	0.80	0.75
6	1.00	1.00
8	1.25	1.25
10	1.50	1.50
12	1.75	1.75
16	2.00	2.00
20	2.50	2.50
24	3.00	3.00
30	3.50	3.50

Alterations

Alterations are available. Refer to the alteration table for applicable codes, dimensional limits and conditions.

For details, please see the PDF catalog.

Technical reference

Straightness measurement

Support both shaft ends on V-blocks, rotate the shaft once and measure the dial gauge amplitude at any point.

Straightness is 1/2 of the measured amplitude.

Roundness M

Shafts with O.D. g6, h5 (hardened)

D		Roundness M
Over	Up to	Roundness M
7	13	0.004
13	20	0.005
20	40	0.006
40	50	0.007

Unit: mm

Shafts with O.D. f8 (not hardened)

D		Roundness M
Over	Up to	Roundness M
7	10	0.011
10	18	0.014
18	30	0.017
30	50	0.020

Straightness K

D	L	Straightness K
8–50	L≤100	0.01 or less
8–50	L>100	(L/100)×0.01 or less

L	Straightness K
L≤100	0.025 or less
L>100	(L/100)×0.025 or less

L dimension tolerance

L		L dimension tolerance
Over	Up to	L dimension tolerance
24	30	±0.2
30	120	±0.3
120	400	±0.5
400	1000	±0.8
1000	1500	±1.2

Hardness reduction at machined areas

Machining is done after hardening, but annealing for machining may reduce hardness.
*Hardness after reduction: approx. 10–40HRC

Hardness reduction range

Approx. 10 mm from the machined area

(Example)

Areas with hardness reduced by annealing

Male thread
• Wrench flats
• Flats
• 90° flats

Hardness reduction at female threads: the conditions depend on material and selection.

SUS440C or 13Cr stainless steel: hardness is reduced at the female thread.

SUJ2 equivalent: under the conditions below, hardness is reduced at the female thread.

When M ≥ D/2
• RC threads
• 2-hole female thread type

Hardness reduction range of drilled-hole types: depends on the material.

SUJ2 equivalent: approx. 20 mm from the end, including the machined area; SUS440C or 13Cr stainless steel: approx. 30 mm from the end, including the machined area

*Near the drilled hole, annealing may cause deformation outside the O.D. tolerance.

Effective hardened depth: depends on outer dimensions and material.

O.D. D	Effective hardened depth
O.D. D	SUJ2 equivalent	SUS440C / 13Cr stainless steel
8, 10	0.5 or more	0.5 or more
12, 13	0.7 or more	0.5 or more
15–20	0.7 or more	0.7 or more
25–50	1.0 or more	0.7 or more

Hard chrome plating on machined areas: hard chrome plated items are machined after plating, so machined areas are not plated.

In the example below, only the "///" area is hard chrome plated.

Example: plating remains on a stepped male-thread shaft with an added flat

Plating removal at drilled holes

Deburring of the drilled hole may remove plating near the hole.

Shafts vs. rotary shafts

Specification comparison: linear shafts and rotary shafts

Basic specifications

Specifications	Shaft		Rotary shaft
Material	SUJ2 equivalent SUS440C or 13Cr stainless steel	S45C equivalent SUS304	S45C equivalent SUS304	SCM435
Hardening	Induction hardening	-	-	Hardness 30–35HRC
O.D. tolerance	g6/h5	f8	g6/h9/h7	g6
Surface treatment	No plating Hard chrome plating Low-temperature black chrome plating Electroless nickel plating (full-length treatment type)	Hard chrome plating	No plating Black oxide Electroless nickel plating	Black oxide Electroless nickel plating

*With hard chrome plating, no plating remains on machined areas.

Overview and technical notes

Annealing for wrench flats, drilled holes and shaft end machining (effective thread length + approx. 10 mm) may reduce hardness.
Near the drilled hole, annealing may cause deformation outside the O.D. tolerance.