Couplings Bore and Keyway Additional Modification Service

Service Introduction Video

Bore Additional Modification [BT]

• Coupling bores can be additionally modified. Bore diameters can be specified in 0.001 mm increments.
• For bore diameters D₁ and D₂, specify the standard bore diameter for each product from minimum diameter to maximum diameter. ^＊1
  ＊1: For standard and maximum bore diameters, see each product page. For disk type, the bore diameters listed in the "Disk Type Bore Diameters Available" below can be specified with this service. For bore diameters outside the range, please contact our customer service.
• Combination with the keyway additional modification KT is also possible.^＊2
＊2: The bore diameters listed in the "Keyway Additional Modification Applicable Bore Diameter List" are available for the service.
• Additional modification is also available for inch size bores. For inch size bore diameters, refer to the table below and specify in millimeter increments.

Please note.

• For disk type bore diameters, specify from the available bore diameter range in the table below.

Table 2　Disk Type Bore Diameters Available

Unit:mm

Disk Type Bore Diameters Available D1・D2
3	4	4.5	5	6	6.35	7	8	9
9.525	10	11	12	13	14	15	16	17
18	19	20	22	24	25	28	30	32
35	38	40	42	45	50

・For bore diameters D1 and D2, specify the standard bore diameter for each product from minimum diameter to maximum diameter.
・Disk type specifiable bore diameters are regularly added.

[BT] Target products

• Coupling category products are targeted.

Type	Target Products
High-gain Rubber	XGT2	XGL2	XGS2	XGT	XGL	XGS
Vibration-Absorption Capable＊1	XGHW
Disc＊2	XHW	XHW-AC＊3	XHS	XBW	XBS	XBWS	XBSS	MDW	MDS	MHW	MHS
Slit	MSX	MST	MWS	MSH	MSTS	MWSS
Jaw	MJC	MJS
Cross Joint	XUT
Oldham	MOC	MOR	MOL	MOS	MOP	MOM	MOHS
Bellows	MFB	MFBS
Serration	MSF
Rigid＊4	MRG	MLR	MRGS	MLRS

・Please contact our customer service for the price and delivery time of MJB MWBS XSTS XWSS XRP.
＊1：　Bore additional modification is only performed on the D₁ side for The vibration-absorption capable disk type XGHW.
＊2：　For disk type bore diameters D₁ and D₂, specify from the disk type available bore diameter range table.
XHW-10 are not available.
＊3：　Bore additional modification is only performed on the D₂ side for XHW-AC.
＊4：　MRG-W MRGS-W MLR-V MLRS-V are not available.

How to use the service

Specify the modification symbol BT after the bore diameter to be modified.
Order via email or fax.
Combination with the keyway additional modification KT ^＊1 is also possible.
＊1: The bore diameters listed in the "Keyway Additional Modification Applicable Bore Diameter List" are available for the service.

Additional modification of keyway [KT][KA]

• Couplings can be additionally modified with new JIS keyways based on JIS B 1301.
• Metric or inch keyways can be selected with the modification symbol.
  [KT] Metric Keyway Modification (JIS Standard)
  [KA] Inch Keyway Modification (AGMA Standard)
• The bore diameters listed in the "Keyway Additional Modification Applicable Bore List" in the table below are available for the service.
• Keyway additional modification is available for both single-side only and double-side.
  

  As high-gain rubber and rigid types have the same bore diameter on both sides, keyway modification is available for double-side only.

• Combination with the bore additional modification BT is also possible.

Target products

Type	Target Products
High-gain Rubber	XGT2	XGL2	XGS2	XGT	XGL	XGS
Vibration-Absorption Capable＊1	XGHW
Disc	XHW	XHW-AC＊2	XHS	XBW	XBS	XBWS	XBSS	MDW	MDS	MHW	MHS
Jaw	MJC	MJS
Cross Joint	XUT
Oldham	MOC	MOR	MOL	MOS	MOP	MOM	MOHS
Bellows	MFB	MFBS
Serration	MSF
Rigid＊3	MRG	MLR	MRGS	MLRS

Please contact our customer service for the price and delivery time of MSX MST MSTS MWS MWSS MWBS XSTS XWSS.

We also offer keyway additional modification not listed in the catalog. Please contact our customer service.

＊1:　Keyway additional modification is only performed on the D₁ side for The vibration-absorption capable disk type XGHW.
＊2:　Keyway additional modification is only performed on the D₂ side for XHW-AC.
＊3:　Rigid Type MRG-W MRGS-W MLR-V MLRS-V is not targeted.

Keyway Additional Modification Applicable Bore Diameter List

Metric Keyway Modification

unit:mm

Applicable Bore Diameter D1D2					Keyway				Key
					b		t		Nominal Dimension b×h
					Standard Dimension	Allowance (JS9)	Standard Dimension	Allowance
6	7				2	±0.0125	1.0	+0.1 0	2×2
8	9	10			3		1.4		3×3
11	12				4	±0.0150	1.8		4×4
13	14	15	16	17	5		2.3		5×5
18	19	20	22		6		2.8		6×6
24	25	28	30		8	±0.0180	3.3	+0.2 0	8×7
32	35	36	38		10		3.3		10×8
40	42	44			12	±0.0215	3.3		12×8
45	48	50			14		3.8		14×9
55					16		4.3		16×10

Excerpt from JIS B 1301

・The service does not cover keyway additional modification for bore diameters not listed in the table. Please contact our customer service.

Inch Keyway Modification

unit:inch

Standard Inch Bore Diameter D1D2	Keyway
	Wk		T
	Standard Dimension	Allowance	Standard Dimension	Allowance
1/2	1/8	+0.002   0	0.560	+0.01   0
9/16	1/8	+0.002   0	0.623	+0.01   0
5/8	3/16	+0.002   0	0.709	+0.01   0
11/16	3/16	+0.002   0	0.773	+0.01   0
3/4	3/16	+0.002   0	0.837	+0.01   0
13/16	3/16	+0.002   0	0.900	+0.01   0
7/8	3/16	+0.002   0	0.964	+0.01   0
15/16	1/4	+0.002   0	1.051	+0.01   0
1	1/4	+0.002   0	1.114	+0.01   0
1-1/8	1/4	+0.002   0	1.241	+0.01   0
1-1/4	1/4	+0.002   0	1.367	+0.01   0
1-3/8	5/16	+0.002   0	1.518	+0.01   0
1-1/2	3/8	+0.002   0	1.669	+0.01   0
1-5/8	3/8	+0.002   0	1.796	+0.01   0
1-3/4	3/8	+0.002   0	1.922	+0.01   0

Excerpt from AGMA standards

How to use the service

Specify the modification symbol KT after the bore diameter with the keyway to be modified.
Order via email or fax.
Combination with the bore additional modification BT is also possible.

Fees・Delivery

• Please feel free to contact us.