JT Beam Couplings

Coupling Selector · Specifications

JT Beam Couplings selector

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

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Complete size table · 50 sizes (static version for printing and full-text search)

JT-1 Series · JT-1 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	F dimension F · mm	Set screw M	Tightening torque N·m
JT1-16	4	6.35	16	23	3	M3	0.7
JT1-20	5	9.525	20	26	3	M3	0.7
JT1-25	8	12	25	31	4	M4	1.7
JT1-32	10	14	32	41	6	M4	1.7
JT1-40	10	18	40	56	8.5	M5	4
JT1-50	12	19	50	71	10.5	M6	7
JT1-63	14	24	63	90	13	M8	15

JT-1 Series · JT-1 Performance
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia 10⁻⁶ kg·m²	Static torsional stiffness N·m/rad	Radial misalignment mm	Angular misalignment °	Axial misalignment mm	Weight g
JT1-16	0.8	1.6	22000	0.32	46	0.1	1.5	±0.3	8
JT1-20	1.1	2.2	18000	8.8	115	0.1	1.5	±0.3	16
JT1-25	1.4	2.8	14000	2.5	165	0.15	1.5	±0.35	28
JT1-32	2.8	5.6	10000	9.5	270	0.15	1.5	±0.35	62
JT1-40	6.3	12.6	9400	31	345	0.2	1.5	±0.35	134
JT1-50	11	22	7600	100	580	0.2	1.5	±0.35	266
JT1-63	22	44	6000	300	830	0.2	1.5	±0.35	500

JT-2 Series · JT-2 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	F dimension F · mm	Set screw M	Tightening torque N·m
JT2-16	4	6.35	16	23	3.25	M2.5	1
JT2-20	5	9.525	20	26	3.75	M2.5	1
JT2-25	8	12	25	31	4.25	M3	1.5
JT2-32	10	14	32	41	6	M4	2.5
JT2-40	10	18	40	56	8.5	M5	4
JT2-50	12	19	50	71	10.5	M6	8
JT2-63	14	24	63	90	13	M8	16

JT-2 Series · JT-2 Performance
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia 10⁻⁶ kg·m²	Static torsional stiffness N·m/rad	Radial misalignment mm	Angular misalignment °	Axial misalignment mm	Weight g
JT2-16	0.8	1.6	9300	0.32	48	0.1	1.5	±0.3	8
JT2-20	1.1	2.2	7500	8.8	118	0.1	1.5	±0.3	16
JT2-25	1.4	2.8	6000	2.5	167	0.15	1.5	±0.35	32
JT2-32	2.8	5.6	4600	9.5	228	0.15	1.5	±0.35	66
JT2-40	6.3	12.6	3600	32	346	0.2	1.5	±0.35	138
JT2-50	11	22	3000	90	580	0.2	1.5	±0.35	272
JT2-63	22	44	2200	310	843	0.2	1.5	±0.35	530

JT-3 Series · JT-3 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	F dimension F · mm	Set screw M	Tightening torque N·m
JT3-17	4	6	17.5	23	3.1	M3	0.7
JT3-19	5	8	19.5	24.5	3.5	M4	1.5
JT3-25	5	10	25	25.4	3.55	M4	1.7
JT3-28	6	12.7	28	28.6	3.6	M5	1.7
JT3-38	8	15	38	38.1	4.15	M5	3.8
JT3-50	12	19	50	50.8	5.25	M6	4

JT-3 Series · JT-3 Performance
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial misalignment mm	Angular misalignment °	Axial misalignment mm	Weight g
JT3-17	0.3	0.6	12000	6.1×10-7	65	0.12	2	±0.25	12
JT3-19	0.5	1	10000	6.9×10-7	110	0.1	2	±0.15	12
JT3-25	1.2	2.4	10000	2.8×10-6	170	0.1	2	±0.15	28
JT3-28	1.6	3.2	8000	5.1×10-6	260	0.1	2	±0.15	44
JT3-38	4.2	8.4	8000	2.1×10-5	330	0.1	2	±0.15	78
JT3-50	9	18	6000	9.0×10-5	560	0.1	2	±0.15	130

JT-4 Series · JT-4 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	F dimension F · mm	Set screw M	Tightening torque N·m
JT4-19	3	6.35	19	22.9	3.1	M2.5	1
JT4-25	5	10	25	31.8	4.15	M3	1.5
JT4-28	6	12.7	28	38.1	5	M3	2
JT4-38	8	15	38	41.3	5.9	M5	4
JT4-50	12	19	50	51	6.7	M6	7.5

JT-4 Series · JT-4 Performance
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial misalignment mm	Angular misalignment °	Axial misalignment mm	Weight g
JT4-19	0.5	1	8000	9.0×10-7	110	0.1	2	±0.15	14
JT4-25	1.2	2.4	6000	2.6×10-6	170	0.1	2	±0.15	34
JT4-28	1.6	3.2	5000	8.9×10-6	260	0.1	2	±0.15	48
JT4-38	4.2	8.4	4500	3.2×10-5	330	0.1	2	±0.15	96
JT4-50	9	18	4500	9.8×10-5	560	0.1	2	±0.15	140

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

Beam (Slit) Couplings: what size range does the table cover?

This page covers 4 series (JT-1, JT-2, JT-3, JT-4) with 25 catalogue sizes: bores from Ø3 to Ø24 mm, rated torque 0.3–22 N·m. Finished bores, keyways and clamp variants are machined to your shaft; sizes outside the tables are made to drawing.

Beam (Slit) Couplings: what is it and when should I use it?

JT series parallel-slot (beam) couplings: a one-piece metal flexure, zero backlash and compact, compensating angular and slight radial misalignment. JT-1 to JT-4 differ in mounting style and slot pattern — full data in the PDF. Beam (slit) couplings are the compact, low-cost zero-backlash choice for small servo motors, encoders and stepper drives at low torque: one machined piece, no wearing parts, good angular and slight radial compensation. For higher torque or stiffness, move to a disc or bellows coupling.

Beam (Slit) 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.

Beam (Slit) 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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Beam (Slit) Couplings