Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848)

Specifications

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How to choose Springs

Points to check when selecting, with the values for this product (Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848)).

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 using stainless steel spring wire. Large-size series with inner diameter 12–18 mm, with spring constant and operating angle listed for each wire diameter and number of coils.

FAQ

Q. What material is Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848) made of?

A. It is made of SUS304-WPB. It uses stainless steel spring wire.

Q. What are the ranges of inner diameter, arm length, and wire diameter for Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848)?

A. Inner diameter is 12, 14, 16, and 18 mm, arm length is 48, 56, 64, and 72 mm, and wire diameter d is 1.2–2.9 mm.

Q. What applications is Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848) suited for?

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

Q. What are the winding direction and specifications of Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848)?

A. It is a right-hand wound close-coiled type. Specifications are available in 2–5 coils and 90°, 135°, and 180° angles.

Q. Does Torsion Spring, Right-Hand Wound, Inner Diameter 12–18 mm (33-1220 to 33-1848) support same-day shipping?

A. Yes, same-day shipping is supported. Orders placed by 5:00 PM are eligible.

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/