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  • BOLTTE 45 steel 8-bolt single and double disc diaphragm shaft couplings
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BOLTTE 45 Steel 8-Bolt Single & Double Disc Diaphragm Couplings

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BOLTTE 45 Steel 8-Bolt Single & Double Disc Diaphragm Couplings
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BOLTTE 45 Steel 8-Bolt Single & Double Disc Diaphragm Couplings

BOLTTE 45 steel 8-bolt diaphragm couplings connect motor and driven shafts in servo, ball-screw, pump and machine transmission assemblies. Single- and double-disc configurations are available with clamp, set-screw, stepped and locking-assembly hub styles.

Configuration guide

  • Single-disc series: HJNB, HJSWT, HJSB, HJSTB, HJSZT and HJSYT.
  • Double-disc series: HJLWT, HJMB, HJLB, HJLTB and HJLZT.
  • Outer diameter, overall length and available bore range are shown in the configuration selector.
  • Configurations marked Bore A and Bore B allow different finished bore ranges on the two hubs.

8-bolt disc couplings: do not merge Bore A and Bore B

This range includes single- and double-disc models with different hub styles. Some labels give separate bore ranges for the two ends; each range must be respected independently.

Selection detailWhat to check
HJNB / OD 65 x L 55.5 mmThe example lists Bore A 12–30 mm and Bore B 12–38 mm.
Hub typeCheck clamp, set-screw, stepped or locking-assembly construction against the shaft interface.
Final specificationState disc count, full series, length and the finished bore required at each end.

Does an 8-bolt pattern establish a torque rating?

No. Bolt count is a construction detail, not a substitute for the model's verified torque, speed and misalignment limits.

Related selection references

Compare the drawings and intended function; these references are not a statement of direct interchangeability.

Ordering and installation

  • Select the required disc count, hub style, series, outer diameter, length and bore range.
  • State the finished bore dimensions for both shafts in the order requirements.
  • Confirm shaft tolerances, keyway or clamping requirements, installation clearance and fastener access before ordering.
  • Verify torque, speed and permitted axial, angular and parallel misalignment for the application before use.
45 steel single and double disc diaphragm couplings 8-bolt disc coupling product structure 8-bolt disc coupling model range Rounded slot edges on an 8-bolt disc coupling Rounded hub edges on an 8-bolt disc coupling Black oxide finish on a 45 steel disc coupling SUS304 eight-hole coupling discs Grade 12.9 socket-head screws Optional keyway machining for compatible coupling models JLTB and JSTB coupling dimensions and technical specifications JMB and JNB coupling dimensions and technical specifications JLZT and JSZT coupling dimensions and technical specifications JLB coupling dimensions and technical specifications JSB coupling dimensions and technical specifications JLWT and JSWT coupling dimensions and technical specifications JLY and JSY coupling dimensions and technical specifications JLYT and JSYT coupling dimensions and technical specifications

Modell / Konfiguration / SKU

BOLTTE 45 Steel 8-Bolt Single & Double Disc Diaphragm Couplings
Modell / KonfigurationSKU
8-Bolt Single-Disc Single-Step Set-Screw HJNB / OD 65 x L 55.5 mm / Bore A 12-30 mm / Bore B 12-38 mm 5017405952698
8-Bolt Single-Disc Single-Step Set-Screw HJNB / OD 87 x L 67 mm / Bore A 17-38 mm / Bore B 17-42 mm 5017405952699
8-Bolt Single-Disc Single-Step Set-Screw HJNB / OD 94 x L 68 mm / Bore A 17-42 mm / Bore B 19-45 mm 5017405952700
8-Bolt Single-Disc Single-Step Locking Assembly HJSWT / OD 65 x L 63 mm / Bore 14-35 mm 5017405952701
8-Bolt Single-Disc Single-Step Locking Assembly HJSWT / OD 87 x L 72 mm / Bore 16-35 mm 5017405952702
8-Bolt Single-Disc Clamp HJSB / OD 39 x L 34.5 mm / Bore 8-19 mm 5017405952706
8-Bolt Single-Disc Clamp HJSB / OD 44 x L 34.5 mm / Bore 8-24 mm 5017405952707
8-Bolt Single-Disc Clamp HJSB / OD 56 x L 45 mm / Bore 10-30 mm 5017405952708
8-Bolt Single-Disc Clamp HJSB / OD 65 x L 55.5 mm / Bore 12-35 mm 5017405952709
8-Bolt Single-Disc Clamp HJSB / OD 87 x L 67 mm / Bore 17-42 mm 5017405952710
8-Bolt Single-Disc Clamp HJSB / OD 94 x L 68 mm / Bore 19-45 mm 5017405952711
8-Bolt Single-Disc Double-Step Set-Screw HJSTB / OD 65 x L 55.5 mm / Bore 12-32 mm 5017405952712
8-Bolt Single-Disc Double-Step Set-Screw HJSTB / OD 87 x L 67 mm / Bore 17-38 mm 5017405952713
8-Bolt Single-Disc Double-Step Set-Screw HJSTB / OD 94 x L 68 mm / Bore 17-42 mm 5017405952714
8-Bolt Single-Disc Double-Step Set-Screw HJSTB / OD 104 x L 80 mm / Bore 19-48 mm 5017405952715
8-Bolt Single-Disc Dual Locking Assembly HJSZT / OD 65 x L 68.6 mm / Bore 14-35 mm 5017405952717
8-Bolt Single-Disc Dual Locking Assembly HJSZT / OD 87 x L 77 mm / Bore 16-35 mm 5017405952718
8-Bolt Single-Disc Dual Locking Assembly HJSZT / OD 94 x L 78 mm / Bore 16-48 mm 5017405952719
8-Bolt Double-Disc Single-Step HJLWT / OD 56 x L 75 mm / Bore 12-24 mm 6206868535947
8-Bolt Double-Disc Single-Step HJLWT / OD 65 x L 84 mm / Bore 14-35 mm 5017405952721
8-Bolt Double-Disc Single-Step Set-Screw HJMB / OD 65 x L 77 mm / Bore A 12-30 mm / Bore B 12-38 mm 5017405952723
8-Bolt Double-Disc Single-Step Set-Screw HJMB / OD 87 x L 94 mm / Bore A 17-38 mm / Bore B 17-42 mm 5017405952724
8-Bolt Double-Disc Single-Step Set-Screw HJMB / OD 94 x L 98 mm / Bore A 17-42 mm / Bore B 19-45 mm 5017405952725
8-Bolt Single-Disc Single Locking Assembly HJSYT / OD 65 x L 63 mm / Bore 14-35 mm 5017405952728
8-Bolt Single-Disc Single Locking Assembly HJSYT / OD 87 x L 72 mm / Bore 16-35 mm 5017405952729
8-Bolt Double-Disc Clamp HJLB / OD 56 x L 64 mm / Bore 10-30 mm 5017405952735
8-Bolt Double-Disc Clamp HJLB / OD 65 x L 77 mm / Bore 12-35 mm 5017405952736
8-Bolt Double-Disc Clamp HJLB / OD 87 x L 94 mm / Bore 17-42 mm 5017405952737
8-Bolt Double-Disc Clamp HJLB / OD 94 x L 98 mm / Bore 19-45 mm 5017405952738
8-Bolt Double-Disc Double-Step HJLTB / OD 65 x L 77 mm / Bore 12-32 mm 5017405952739
8-Bolt Double-Disc Double-Step HJLTB / OD 87 x L 94 mm / Bore 17-38 mm 5017405952740
8-Bolt Double-Disc Double-Step HJLTB / OD 94 x L 98 mm / Bore 17-42 mm 5017405952741
8-Bolt Double-Disc Double-Step HJLTB / OD 104 x L 112 mm / Bore 19-48 mm 5017405952742
8-Bolt Double-Disc Dual Locking Assembly HJLZT / OD 65 x L 90.8 mm / Bore 14-35 mm 5017405952744
8-Bolt Double-Disc Dual Locking Assembly HJLZT / OD 87 x L 104 mm / Bore 16-35 mm 5017405952745
8-Bolt Double-Disc Dual Locking Assembly HJLZT / OD 94 x L 108 mm / Bore 16-48 mm 5017405952746

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