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Torsion Spring, Left-Hand Coil, Inner Diameter 7-10 mm (34-0720 to 34-1048)

ねじりスプリング 左巻 34シリーズ / Spring net (Official website)

Left-hand close-coiled torsion spring made of SUS304-WPB. Available in inner diameters of 7-10 mm, 2-5 coils, and angles of 90°, 135°, and 180°, with same-day shipping support.

Last verified: (date the content was verified against the source document)

Specifications

Inner diameter 7・8・9・10 mm
Arm length 28・32・36・40 mm
Wire diameter d 0.7〜1.6 mm
Material SUS304-WPB
Winding Direction Left (close-wound)

ねじりスプリング 左巻 34シリーズ model comparison

Compare 3 models in the same series by specification.

Model Wire diameter d Material Inner diameter Winding Direction Arm length
ねじりスプリング 左巻 内径12〜18mm(34-1220〜34-1848) 1.2〜2.9 mm SUS304-WPB 12・14・16・18 mm Left (close-wound) 48・56・64・72 mm
ねじりスプリング 左巻 内径3〜6mm(34-0320〜34-0648) 0.3〜1.0 mm SUS304-WPB 3・4・5・6 mm Left (close-wound) 12・16・20・24 mm
ねじりスプリング 左巻 内径7〜10mm(34-0720〜34-1048) This product 0.7〜1.6 mm SUS304-WPB 7・8・9・10 mm Left (close-wound) 28・32・36・40 mm

How to choose Springs

Points to check when selecting, with the values for this product (Torsion Spring, Left-Hand Coil, Inner Diameter 7-10 mm (34-0720 to 34-1048)).

  1. 1. Select the Spring Rate from the Required Force

    The spring rate k is the load required to deflect the spring by 1 mm. Multiply it by the deflection at installation and at operation to confirm that the required force can be obtained. Listed products range widely from 0.007 to 9.91 N/mm, and a margin should be allowed for variation, including the spring rate tolerance (for example, ±10%).

  2. 2. Keep Within the Maximum Load and Deflection Limits

    Using the spring beyond its maximum load or maximum deflection causes set (permanent deformation) or breakage. Confirm that the load at the maximum point of the operating stroke is within the maximum load, and for compression springs, that the solid height is not reached.

  3. 3. Installation Space, Outside Diameter, and Free Length

    Check that the outside diameter fits the hole or housing, and that the inside diameter does not interfere with the shaft it passes over (applicable shaft diameter). The free length is the length under no load; the difference from the installed length is the initial deflection. Because the coil diameter changes under load, allow sufficient clearance.

  4. 4. Select a Material Suited to the Operating Environment

    This product: Material SUS304-WPB

    Piano wire SWP-A has high strength but is prone to rust, and many versions are supplied with rust-preventive oil treatment. For humid environments or environments subject to washing, stainless steel such as SUS304-WPB is a candidate. For strongly corrosive environments such as seawater, titanium is a candidate.

  5. 5. Extension Springs: Initial Tension and Hook Shape

    Close-wound extension springs have initial tension, the load required before the spring begins to extend. For applications requiring movement with a small force, check the initial tension value. Also check that the hook shape, such as reverse loop, 90-degree, or 180-degree, matches how the mating part is engaged.

  6. 6. Torsion Springs: Angle and Arm Direction

    For torsion springs, check the torque at the operating angle (torsion spring rate × angle) and the arm length. The winding direction should match the direction of twist, and it is common to use the spring in the direction that winds it up. For free-size products, also specify the bending direction.

This guide was written by AI based on the listed products' documents and specification items.

About Springs and all products

Description

Left-hand close-coiled torsion spring made from spring stainless steel wire. Sizes are the same as the right-hand coil (33 Series), developed in a left-hand coil version.

Features

  • Made of SUS304-WPB
  • Same-day shipping (orders placed by 5:00 PM)
  • RoHS compliant
  • Online-ordering compatible product

Applications

  • Return and biasing of mechanical components
  • Hinge and opening/closing mechanisms

FAQ

Q. What are the selectable ranges of inner diameter and arm length for the Torsion Spring, Left-Hand Coil, 34 Series (34-0720 to 34-1048)?
A. Inner diameters are 7, 8, 9, and 10 mm, and arm lengths are 28, 32, 36, and 40 mm.
Q. What are the material, wire diameter, and coil direction of the Torsion Spring, Left-Hand Coil, 34 Series?
A. The material is SUS304-WPB, and the wire diameter d is 0.7-1.6 mm. The coil direction is left-hand (close-coiled).
Q. Are the dimensions of the Torsion Spring, Left-Hand Coil, 34 Series the same as those of the right-hand 33 Series?
A. The sizes are the same as the right-hand coil (33 Series), developed in a left-hand coil version.
Q. What applications can the Torsion Spring, Left-Hand Coil, 34 Series be used for?
A. It can be used for return and biasing of mechanical components, and for hinge and opening/closing mechanisms.
Q. Does the Torsion Spring, Left-Hand Coil, 34 Series support same-day shipping, and is it RoHS compliant?
A. Orders placed by 5:00 PM are eligible for same-day shipping. The product is RoHS compliant.

Written by AI based on the content of the source documents.

Source documents

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