Compression Limiter – Machined – Headed – ISO 10.9

compression limiters machined headed


More Information

compression limited machined headed

compression limiter machined headed

  • ISO Class 10.9 bolt or less
  • Press-In or Over-Molding
  • 2024 Aluminum
  • Knurls for Retention
  • Machined Mating Surfaces
  • Headed for More Bearing / Mating Surface

Standard Material

  • Aluminum
  • ASTM B211 2024

Standard Finish

  • Plain

Bolt Selection

compression limited machined headed
The first step when engineering a bolted joint is developing the total load needed between the two mating parts.

Bolted Joint – Load Considerations:

  • Minimum total load necessary between mating parts.
  • Vibration
  • Environmental extremes
  • Product lifecycle
  • Factor of safety
ThreadClass 5.8 Loads (N)Class 8.8 Loads (N)Class 10.9 Loads (N)Class 12.9 Loads (N)
M8 x 1.0014,90011,20022,70017,00032,50024,40038,00028,500
M8 x 1.5013,90010,40021,20015,90030,40022,80035,50026,600
M10 x 1.0024,50018,40037,40028,10053,50040,10062,70047,000
M10 x 1.2523,30017,50035,50026,60050,80038,10059,40044,600
M10 x 1.5022,00016,50033,70025,30048,10036,10056,30042,200
M12 x 1.2535,00026,30053,40040,10076,40057,30089,30067,000
M12 x 1.5033,50025,10051,10038,30073,10054,80085,50064,100
M12 x 1.7532,00024,00048,90036,70070,00052,50081,80061,400
  • Proof load represents bolt failure
  • Clamp load is 75% of proof load – do not exceed when engineering a bolt joint
  • Total joint strength is the addition of each bolt joint

Engineer the bolt working load to be 25% to 75% of the proof load.
Under the “Torque Specifications” tab we translate clamp load into torque.
The user has to establish realistic torque tolerances they can expect from their assembly process.

Once the total load between two mating surfaces and the total number of bolted joints has been established the bolt size, thread pitch, and bolt ISO class can be determined.

Compression Limiter Selection

compression limited machined headed
The next step after selecting a bolt is to choose the correct compression limiter.

Bolted Joint – Compression Limiter Considerations:

  • ISO bolt class to be used
  • Press-in or over-mold
  • Round or oval
  • Overall length
Insertion TypeSeriesISO 8.8ISO 10.9ISO 12.0
Press in - split seam
Press in - split seam
Over mold - closed seam
Over mold - closed seam
Press in or over mold
Press in or over mold

We commonly produce compression limiters engineered for special applications – both formed and machined.

A complete part number can be configured as follows:

  • The press-in or over-mold options can be selected on the home page of this web site.
  • The ISO bolt class and shape (round or oval) can be selected on the intermediate pages.
  • The bolt diameter and compression limiter length are selected on the catalog page.

Once the complete part number is configured all important dimensions, tolerances, and corresponding hole size are listed on the catalog page.

Enter an RFQ quantity on the catalog page and submit a complete RFQ to Hubbard Spring.

Bolted Joint Considerations

compression limited machined headed
In addition to bolt and compression limiter selection, the following should be considered when engineering a bolted joint:

  • Compression limiter length should be slightly less than the surrounding plastic thickness. This helps clamp the plastic in place and limits its motion around the compression limiter.
  • A flanged bolt or bolt / washer combination should be used with split / closed seam compression limiters.
  • A standard bolt may be used with headed machined compression limiters (CLMH).
  • Combinations of round / oval compression limiters are used to eliminate tolerance stack issues between mating components.

Plastic Hole Design

compression limiter machined headed
The following should be considered when engineering a hole for press-in compression limiter applications:

  • A lead it radius on the plastic is highly recommended – this will provide smooth insertion when combined with our chamfered compression limiter.
  • When a draft angle is used the taper extremes need to be within the tolerance of the recommended hole size.

Torque Specifications

compression limited machined headed
The following table shows the torque that will achieve each bolt’s clamp load (75% of proof load).

All torques are listed in Newton Meters (Nm).

Actual clamp loads achieved will vary.

ThreadClass 5.8 TorqueClass 8.8 TorqueClass 10.9 TorqueClass 12.9 Torque
M8 x 1.0017.913.427.220.439.029.345.634.2
M8 x 1.5016.612.525.419.136.527.442.631.9
M10 x 1.0036.827.656.
M10 x 1.2535.026.353.239.976.
M10 x 1.5033.024.850.638.
M12 x 1.2563.147.396.272.2137.5103.1160.8120.6
M12 x 1.5060.245.291.968.9131.598.6153.8115.4
M12 x 1.7557.643.288.166.1126.094.5147.4110.5


compression limited machined headed
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