Torsion Spring Right-Hand Wound, Inner Diameter 7 to 10 mm (33-0720 to 33-1048)

Specifications

ねじりスプリング 右巻 33シリーズ model comparison

Compare 2 models in the same series by specification.

How to choose Springs

Points to check when selecting, with the values for this product (Torsion Spring Right-Hand Wound, Inner Diameter 7 to 10 mm (33-0720 to 33-1048)).

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

Right-hand wound close-coiled torsion spring made from spring stainless steel wire. Part numbers are separated by inner diameter, wire diameter, arm length, number of coils and arm angle, and the spring constant and operating angle are indicated for each specification. As a guideline, the unwinding direction should be used up to 70% of the operating angle.

FAQ

Q. What are the material and winding direction of the Torsion Spring Right-Hand Wound, 33 Series (inner diameter 7 to 10 mm)?

A. The material is SUS304-WPB and the winding direction is right-hand (close-coiled).

Q. What is the selectable range of inner diameter, arm length and wire diameter for the Torsion Spring Right-Hand Wound, 33 Series?

A. Inner diameter is 7, 8, 9 or 10 mm, arm length is 28, 32, 36 or 40 mm, and wire diameter d is 0.7 to 1.4 mm. Part numbers are separated by inner diameter, wire diameter, arm length, number of coils and arm angle.

Q. What applications can the Torsion Spring Right-Hand Wound, 33 Series be used for?

A. It can be used for return and biasing of mechanical components, and for hinges and opening/closing mechanisms.

Q. What is the guideline for the operating angle in the unwinding direction of the Torsion Spring Right-Hand Wound, 33 Series?

A. As a guideline, the unwinding direction should be used up to 70% of the operating angle. The spring constant and operating angle are indicated for each specification.

Q. Is same-day shipping available for the Torsion Spring Right-Hand Wound, 33 Series (33-0720 to 33-1048)?

A. Yes, same-day shipping is available for orders placed by PM 5:00. It is also RoHS compliant.

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

Source documents

• Catalog スプリングネット 製品カタログ（ばね類） 178 pages
  Found on: https://www.samini.co.jp/catalog_list/