Linear Shaft One End Threaded, with Undercut, Wrench Flats

  For keyway machining only (KC), please check the delivery date on WOS.

Alterations	Code	Spec.
	LKC	Change L dimension tolerance Specification method LKC Applicable conditions The maximum L dimension for precision type is 200 When using LKC, the L dimension can be specified in 0.1 mm increments L<200 →L±0.03 200 ≤ L<500 →L±0.05 L ≥ 500 →L±0.1 Not applicable when D-M ≤ 2
	FC	Add flat machining at 1 location Specified Method FC10-E8 Applicable Conditions Not applicable for precision type FC, E = specified unit 1 mm FC ≤ 3 × D When 1.5 × D E = 0 or E ≥ 2 Cannot be used together with WFC	D h 8 to 18 1 20 to 40 2 50 3
	WFC	Additional machining on 2 surfaces Specified Method WFC8-A8-E4 Applicable Conditions Not applicable for precision type WFC, A, E = specified unit 1 mm WFC ≤ 3 × D When 1.5 × D A(E) = 0 or A(E) ≥ 2 Cannot be machined on the same surface, cannot be used together with FC	D h 8 to 18 1 20 to 40 2 50 3
	SX	Add a second wrench slot machining Specification method SX15 Applicable conditions Only applicable to types with wrench slots SX = specified unit 1 mm SC+SX+ℓ1 × 2<L SX ≥ 0 Cannot be machined on the same plane	D W ℓ1 8 7 8 10 8 12 10 10 13 11 15 13 16 14 18 16	D W ℓ1 20 17 10 25 22 30 27 15 35 30 40 36 20 50 41
	RC	Add one 90-degree flat machining location Specification method RC10 Applicable conditions Suitable for D=10 to 30 Not applicable for precision type Cannot be used together with WRC	D b1 h 10 6 0.5 12 to 20 1.0 25 10 30 12
	WRC	Add machining of two additional 90-degree surfaces Specification method WRC10-Y10 Applicable conditions Suitable for D=10 to 30 Not applicable for precision type Cannot be used together with RC Cannot be machined on the same surface	D b1 h 10 6 0.5 12 to 20 1.0 25 10 30 12
	MMC MMS	Change external thread to fine thread Specification method MMC14   (Change M to MMC)   MMS14   (Change M to MMS)	D MMC MMS 8 3 4 5 6 8                       10   4 5 6 8 10             10       12     5 6 8 10 12           10 12     13     5 6 8 10 12           10       15     5 6 8 10 12 15         10 12     16     5 6 8 10 12 15         10 12 14   18     5 6 8 10 12 15 17       10 12 14 18 20       6 8 10 12 15 17 20     10 12 14 18 25         8 10 12 15 17 20 25   10 12 14 18 30         8 10 12 15 17 20 25 30 10 12 14 18 35           10 12 15 17 20 25 30 10 12 14 18 40             12 15 17 20 25 30   12 14 18 50               15 17 20 25 30     14 18 Thread Pitch 0.35 0.5 0.75 1.0 1.5 1.25 1.5 Fine Thread Clearance Dimensions MMC Pitch MC g 6 0.75 4.8 2.0 8 1.0 6.4 10 8.4 12 10.4 15 13.4 17 15.4 20 18.4   MMS Pitch MC g 10 1.25 8 3 12 1.5 9.7 14 11.7 18 15.7
	KC	Add keyway machining at 1 location Specification method KC10-G10 Applicable conditions Only applicable for D=12·16·20·25·30 Not applicable for precision type	Axis Diameter b t r Reference dimension Tolerance (N9) Reference dimension Allowable Deviation 12 4 0 -0.03 2.5 +0.1 0 0.08 to 0.16 16 5 3.0 0.16 to 0.25 20 6 3.5 25 8 0 -0.036 4.0 +0.2 0 30 When KC+G ≥ L, the keyway shape is as shown below. Example)

When multiple alterations are selected, the machining parts need to be spaced by more than 2 mm. P.108
Additional processing may result in reduced hardness. P.106

Part Number		Can be specified down to 1 mm increments		Selection								Wrench slot size
Type	D	L	F	M (Coarse Thread)								SC	W	ℓ1
Standard (With Wrench Slot Type) (D Tolerance g7) E-SAFS E-SSAFS E-PSAFS E-PSSAFS (D Tolerance f8) E-PSAGS	8	25 to 795	5 ≤ F ≤ M × 3 F-(g) ≥ Pitch × 3	6								SC = Can be specified down to 1 mm increments SC+ℓ1 ≤ L SC ≥ 0 Wrench Slot Details >>Reference (PDF)	7	8
	10	25 to 795		6	8								8
	12	25 to 995		6	8	10							10	10
	13	25 to 995		6	8	10	12						11
	15	25 to 995		6	8	10	12						13
	16	25 to 1195		6	8	10	12						14
	18	25 to 1195		6	8	10	12	16					16
	20	25 to 1195		6	8	10	12	16					17
	25	25 to 1195			8	10	12	16	20	24			22
	30	25 to 1495			8	10	12	16	20	24			27	15

 

D tolerance
D	g7	f8
8	-0.005 -0.020	-0.013 -0.035
10
12	-0.006 -0.024	-0.016 -0.043
13
15
16
18
20	-0.007 -0.028	-0.020 -0.053
25
30

Feature 1: Has high-precision dimensional tolerances and is widely used in various precision equipment.
Feature 2: Uses bearing steel (S45C or GCr15) with excellent wear resistance and SUS440C or high-hardness corrosion-resistant steel, which are high-frequency quenched to enhance wear resistance while maintaining original toughness.
Feature 3: Various additional processing options are available to meet different usage environments.
Feature 4: Usually used in combination with linear bushing products, it provides excellent linear guidance. Compared to general shaft and bushing structures, even during high-speed reciprocating motion, there is minimal wear.
Feature 5: Optional hard chrome plating provides excellent rust resistance, and the coating hardness reaches HV750. It will not be easily worn when used with high-hardness workpieces.

  

(2) Decreased hardness in the machined area  After quenching the base material, machining may cause some areas to lose hardness due to annealing: - All external threads  - All steps  - Internal threads: When M ≥ D/2, double-hole internal thread type, hard chrome plated products made of SUS440C or high-hardness corrosion-resistant steel  - Additional processing for wrench slot (SC-WSC-SX)  - Additional processing for flat surface (FC-WFC)  - Additional processing for V-groove (VC-WVC)  - Except for full-length hardened type.

Only the shaded area of section D is hard chrome plated.

(3) Coating for Surface Treatment  After surface treatment of the base material, processing is performed. The following areas are not plated: - Grooved section  -External thread section  -Internal thread section  -Wrench slot, V-groove, flat surface, cut surface  -The inside of the pipe-type guide shaft may rust if hard chrome plating is not applied.

Anti-rust performance of metal materials and surface treatment  Click Anti-rust performance table