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Shims and chocks

SKF Vibracon adjustable chocks

Self-levelling, height-adjustable steel chocks for all rotating machinery
  • Brand
    SKF
  • Bolt sizes
    M12 – M68
  • Angle compensation
    up to 4°
  • Versions
    carbon steel, surface-treated, stainless steel, low profile
  • Available for
    Buy
Request a quote
SKF Vibracon adjustable chocks

SKF Vibracon chocks are self-levelling, height-adjustable steel chocks. They let you mount rotating machines easily and accurately on a frame or on a steel or concrete foundation. They compensate for an angle of up to 4° between machine and foundation, without machining the foundation or pouring epoxy resin, and they eliminate soft foot. There is no curing time, and the chocks remain reusable and adjustable.

Standard series (E series)

TypeBoltHeight (mm)Ø D1 (mm)Max. load (kN)Machine load (kN)Weight (kg)
SM 12 EM12 – M1630 – 406590150.6
SM 16 EM16 – M2035 – 4880140251.0
SM 20 EM20 – M2440 – 54100200351.8
SM 24 EM24 – M3045 – 60120325603.0
SM 30 EM30 – M3650 – 65140475904.6
SM 36 EM36 – M4255 – 701606501206.5
SM 42 EM42 – M4860 – 7519085016010.0
SM 48 EM48 – M5670 – 892101,15020014.5
SM 56 EM56 – M6475 – 942301,50026018.7
SM 64 EM64 – M6880 – 992602,00038025.1

Type + suffix: -CS (carbon steel), -CSTR (surface-treated) or -SS (stainless steel), e.g. SM 24 E-CSTR. Height = standard adjustment range. Max. load: recommended maximum load (proof load of the largest metric bolt). The minimum height can be reduced on a lathe, the maximum height increased with an extra base ring. Source: SKF brochure 19282EN (2024).

Low profile (ELP-ASTR)

TypeBoltHeight (mm)Ø D1 (mm)Max. load (kN)Machine load (kN)Weight (kg)
SM 16 ELP-ASTRM16 – M2025 – 3780140250.8
SM 20 ELP-ASTRM20 – M2425 – 37100200351.2
SM 24 ELP-ASTRM24 – M3025 – 37120325601.8
SM 30 ELP-ASTRM30 – M3625 – 37140475902.4
SM 36 ELP-ASTRM36 – M4230 – 421606501203.8
SM 42 ELP-ASTRM42 – M4835 – 471908501606.4

Chocking advice and bolt calculation

Not sure which SKF Vibracon best suits your situation? We make a proposal free of charge:

  1. Download the questionnaire (see Documentation) and fill in the details.
  2. Send us the completed questionnaire.
  3. You receive a proposal with the recommended number of chocks, the recommended bolts and the corresponding tightening torque.
  4. If required, we arrange approval by the classification society of your choice.

You can also make your own choice with the SKF Vibracon selection tool at vibracon.skf.com.

Not sure which solution best suits your machine and foundation? Contact us; we will be happy to advise you.

Features

Angle compensation up to 4°

Without machining the foundation or pouring epoxy resin.

No soft foot

The self-levelling chock eliminates soft foot.

No curing time

Can be loaded immediately; this makes alignment simple and fast.

Permanently adjustable

The height remains adjustable, and the chocks are reusable.

High load capacity

With an optimised force flow through the product.

Wide adjustment range

And an optimised combination of bolt and Vibracon.

Lower installation height

The height has been reduced across the whole range.

Classification

Type approval from the major classification societies.

Applications

Gas and diesel engines

Compressors

Electric motors

Gearboxes

Generators

Pumps and fans

Bearing housings and turbines

Marine and offshore

Originally developed for shipping.

Variants

Carbon steel (E-CS)

For indoor use: a cost-effective solution for standard applications, such as on the factory floor. Additives on the mating surfaces protect and prevent seizing during adjustment.

Surface-treated (E-CSTR)

For humid and salty environments: each part treated individually, for consistent quality and better corrosion protection.

Stainless steel (E-SS)

For the harshest environments, such as oil and gas and offshore; with a higher load capacity.

Low profile (ELP-ASTR)

Surface-treated alloy steel, for limited chocking height: a cost-effective alternative to machined chocks, shims or epoxy resin in refurbishments.

Technical data

  • Bolt sizes standard
    M12 – M68
    Series
  • Bolt sizes low profile
    M16 – M48
    Series
  • Angle compensation
    up to 4°
    Series
  • Pitch
    1.5 mm (SM 12 – 20), 2 mm (SM 24 – 42), 3 mm (SM 48 – 64)
    Series
  • E-CS
    Carbon steel
    Material
  • E-CSTR
    Surface-treated carbon steel
    Material
  • E-SS
    Stainless steel
    Material
  • ELP-ASTR
    Surface-treated (nitrocarburised) alloy steel
    Material

Accessories

Adjustment tool SMAT 006

For SM 12 E – SM 16 E.

Adjustment tool SMAT 008

For SM 20 E – SM 42 E.

Adjustment tool SMAT 010

For SM 48 E – SM 64 E.

Adjustment tool SMAT 006 LP-3

For SM 16 ELP – SM 20 ELP.

Adjustment tool SMAT 006 LP-4

For SM 24 ELP – SM 42 ELP.

Spherical washers SMSW (…-ASTR and …LPAST)

Make the surfaces between bolt head and nut exactly parallel, compensate for angular errors and prevent bending of the bolt. Surface-treated; in standard and low-profile versions (M16 – M48).

Mounting kit

Complete kit for fast, accurate installation, including for resilient (rubber) mounts: Vibracon chocks, foundation bolts, mounting bolts, nuts, spherical washers and, if required, an approval certificate from the classification society.

Videos

Related products

Documentation