JB Bellows Couplings

Coupling Selector · Specifications

JB Bellows Couplings selector

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JB-1 Series dimensional drawing — JB-1 Series · Engineering drawing · PDF page 1

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Complete size table · 36 sizes (static version for printing and full-text search)

JB-1 Series · JB-1 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	L1 dimension L1 · mm	F dimension F · mm	E dimension E · mm	Set screw M	Tightening torque N·m
JB1-16	4	8	16	30	10.5	4	9.5	M3	0.7
JB1-20	6	12	20	33	12.5	4	12.5	M3	0.7
JB1-25	6	12	25	38	14	5	16	M4	1.7
JB1-32	8	14	32	43	13.5	5	21	M4	1.7
JB1-40	10	16	40	62	21	8.5	28	M5	4
JB1-55	12	19	55	72	23	7.5	38	M6	7

JB-1 Series · JB1 set-screw bellows coupling performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JB1-16	0.8	1.6	20000	3.4×10^-7	100	0.1	1.5	+0.3/-1.0	8
JB1-20	1.5	3	15000	8.9×10^-7	160	0.1	1.5	+0.3/-1.0	12
JB1-25	2	4	13000	2.8×10^-6	220	0.15	2	+0.5/-1.3	28
JB1-32	2.5	5	10000	8.8×10^-6	310	0.2	2	+0.5/-1.3	46
JB1-40	10	20	8000	1.5×10^-5	520	0.2	2	+0.5/-1.3	88
JB1-55	25	50	6000	2.3×10^-5	850	0.2	2	+0.7/-1.5	180

JB-2 Series · JB-2 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	L1 dimension L1 · mm	F dimension F · mm	E dimension E · mm	Set screw M	Tightening torque N·m
JB2-16	4	8	16	30	10.5	4	9.5	M3	0.7
JB2-20	6	12	20	33	12.5	4	12.5	M3	0.7
JB2-25	6	12	25	38	14	5	16	M4	1.7
JB2-32	8	14	32	43	13.5	5	21	M4	1.7
JB2-40	10	16	40	62	21	8.5	28	M5	4
JB2-55	12	19	55	72	23	7.5	38	M6	8
JB2-65	18	38	65	81	25.5	8.5	45	M8	15
JB2-82	20	42	82	103	34.5	10.5	56	M10	28

JB-2 Series · JB2 clamping bellows coupling performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JB2-16	0.8	1.6	18000	3.4×10^-7	100	0.1	1.5	+0.3/-1.0	8
JB2-20	1.5	3	13000	8.9×10^-7	160	0.1	1.5	+0.3/-1.0	14
JB2-25	2	4	11000	2.8×10^-6	220	0.15	2	+0.5/-1.3	32
JB2-32	2.5	5	10000	8.8×10^-6	310	0.2	2	+0.5/-1.3	52
JB2-40	10	20	8000	1.5×10^-5	520	0.2	2	+0.7/-1.5	98
JB2-55	25	50	6000	2.3×10^-5	850	0.2	2	+0.7/-1.5	200
JB2-65	60	120	4500	2.8×10^-5	960	0.2	2	+0.7/-1.5	350
JB2-82	80	160	4000	6.0×10^-5	1290	0.2	2	+0.7/-1.5	750

JB-3-T Series · JB-3-T Dimensions
Model	d1 minimum bore d1 min · mm	d1 maximum bore d1 max · mm	d2 minimum bore d2 min · mm	d2 maximum bore d2 max · mm	Outside diameter D · mm	Overall length L · mm	L1 / L2 L1/L2 · mm	E dimension E · mm	D1 dimension D1 · mm	D2 dimension D2 · mm	M1 screw M1	M screw M	Tightening torque N·m
JB3-40T	10	18	10	18	40	55	19	28	35	38	M4	M4x4	2.5
JB3-55T	12	23	12	23	55	65	22	38	42	52	M5	M5x6	4
JB3-65T	12	29	12	29	65	76	27	45	52	62	M5	M5x6	4
JB3-82T	15	38	15	38	82	87	32	56	70	78	M6	M6x6	8

JB-3-T Series · JB3-T locking-assembly bellows coupling performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JB3-40T	10	20	6600	0.12×10^-3	8300	0.2	1	2	260
JB3-55T	25	50	6000	0.27×10^-3	12900	0.25	1.5	1.5	400
JB3-65T	60	120	5000	0.63×10^-3	21800	0.25	1.5	1.5	800
JB3-82T	130	260	4000	1.50×10^-3	48500	0.25	1.5	1	1200

Static copy of the selector data for reference and printing; use the interactive selector above to filter, sort and request a quote. All dimensions in mm; full range and tolerances per the PDF catalogue.

Dimensions and performance are shown separately. Sort by any column; consult the PDF catalogue for the full range, tolerances, and operating conditions. Download PDF catalogue ↗

FAQ

Common questions about this series

Bellows couplings: what size range does the table cover?

This page covers 3 series (JB-1, JB-2, JB-3-T) with 18 catalogue sizes: bores from Ø4 to Ø42 mm, rated torque 0.8–130 N·m. Finished bores, keyways and clamp variants are machined to your shaft; sizes outside the tables are made to drawing.

Bellows couplings: what is it and when should I use it?

JB series bellows couplings: a metal bellows flexure with high torsional stiffness, zero backlash and high transmission accuracy, compensating misalignment in all three axes. For high-precision positioning, servo, metrology and semiconductor equipment. Bellows couplings give the highest torsional stiffness of the zero-backlash types, so they are used where positioning accuracy and dynamic response matter most: ball-screw drives, measuring machines, encoders and servo axes. They compensate all three kinds of misalignment but are not for shock or damping duty.

Bellows couplings: can I order a size that is not in the table, or just one piece?

Yes. Everything on this page is made to drawing, and the table is only the standard-size subset of the catalogue. Minimum order quantity is one piece — we routinely make single replacement parts for OEMs whose original supplier has discontinued the item. Send a DWG, STEP or PDF drawing (or a sample part): you get a formal quotation within 24 hours after the information is complete, and the first article ships within 30 days of drawing approval, with inspection records.

Bellows couplings: what do I need to send to get a quote?

Send: shaft diameters and lengths on both sides (with keyways or clamp preference), rated and peak torque, speed, the misalignment you expect (angular, radial, axial), space available (outside diameter and overall length), operating temperature and whether the drive is servo/positioning or general. A drawing or STEP of the two shaft ends is ideal; a sketch with these values is enough for a first quote.

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