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Shaft adapter 4-971DINcompactquick-change
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Characteristics
- Applications
- shaft
- Other characteristics
- DIN, compact, quick-change
- Diameter
8 mm
(0.315 in)- Length
22 mm, 32 mm
(0.87 in, 1.26 in)
Description
Product overview
The preset click-type torque adapter 4-971 (0.1 Nm) converts a standard 4 mm C4 bit and a holder into a precise low-torque manual torque tool. It emits an audible click at the preset torque to prevent overtightening. The adapter is primarily intended for manual operation; when used with power tools a maximum speed of 100 rpm is recommended to minimize click repetition.
Area of application
Suitable for assembly and maintenance where very low, repeatable torque is required: electronics, quick-change systems, robotic stations, aerospace, medical device assembly and general bench work.
Technical description
Adapters are tested to DIN EN ISO 6789 (manually operated torque screwdriving tools) and maintain a tolerance of ±10% for at least 20,000 clicks. The torque should be checked periodically with a torque meter. The adapter works by locking the ratchet and controlling torque in the bushing sleeve. The patented mechanism includes a hollow core shaft and a damping cylinder; the core shaft moves the mobile ratchet and the damping cylinder’s slot allows the spacer sleeve to slide. When applied torque exceeds the preset value the core shaft becomes inactive, so tension is no longer increased on the fastener.
General information
Torque adapters are commonly used as a compact solution for precise torque requirements across electronics, quick-change systems, robotic cells, aerospace, medical and bench applications.
Technical specifications
The preset click-type torque adapter 4-971 (0.1 Nm) converts a standard 4 mm C4 bit and a holder into a precise low-torque manual torque tool. It emits an audible click at the preset torque to prevent overtightening. The adapter is primarily intended for manual operation; when used with power tools a maximum speed of 100 rpm is recommended to minimize click repetition.
Area of application
Suitable for assembly and maintenance where very low, repeatable torque is required: electronics, quick-change systems, robotic stations, aerospace, medical device assembly and general bench work.
Technical description
Adapters are tested to DIN EN ISO 6789 (manually operated torque screwdriving tools) and maintain a tolerance of ±10% for at least 20,000 clicks. The torque should be checked periodically with a torque meter. The adapter works by locking the ratchet and controlling torque in the bushing sleeve. The patented mechanism includes a hollow core shaft and a damping cylinder; the core shaft moves the mobile ratchet and the damping cylinder’s slot allows the spacer sleeve to slide. When applied torque exceeds the preset value the core shaft becomes inactive, so tension is no longer increased on the fastener.
General information
Torque adapters are commonly used as a compact solution for precise torque requirements across electronics, quick-change systems, robotic cells, aerospace, medical and bench applications.
Technical specifications
- Model / article number: 4-971
- Preset tightening torque: 0.1 Nm / 1.0 Kgfcm / 0.9 in-lb
- Tolerance: ±10% (factory certificate on request)
- Standard: DIN EN ISO 6789
- Durability: ≥ 20,000 clicks
- Bit holder: magnetic, 4.0 mm hexagon (C4)
- Drive / shank: 4.0 mm hex shank
- Material: alloyed steel
- Adapter Ø: 8 mm
- Adapter length (without shank): 22.0 mm
- Total length: 32 mm
- Weight: 7.5 g
- Note: no torque unlocking when loosening (approx. 30% higher torque when loosening)
- Recommendation for power tools: max. 100 rpm
Catalogs
Screwing Tools - Torque + Bits
36 Pages
Other bernstein products
Torque Tools
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.