Name: Compression Limiter – Split Seam – Round – ISO 8.8
SKU: 57968
Availability: InStock

More Information

ISO Class 8.8 bolt or less
Press-In After Molding
High Carbon Steel
Spring Force Retention
No Interlocking
Lowest Total Installed Cost

Standard Material

High Carbon Steel
SAE 1074
Not Heat Treated

Standard Finish

Zinc Electroplate with Clear Passivation and Sealer

Bolt Selection

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

Thread	Class 5.8 Loads (N)		Class 8.8 Loads (N)		Class 10.9 Loads (N)		Class 12.9 Loads (N)
	Proof	Clamp	Proof	Clamp	Proof	Clamp	Proof	Clamp
M3	1,910	1,430	2,290	2,910	4,180	3,140	4,880	3,660
M3.5	2,580	1,940	3,940	2,960	5,630	4,220	6,580	4,490
M4	3,340	2,500	5,100	3,850	7,290	5,450	8,520	6,400
M5	5,400	4,050	8,230	6,150	11,800	8,850	13,800	10,350
M6	7,640	5,750	11,600	8,700	16,700	12,550	19,500	14,650
M8 x 1.00	14,900	11,200	22,700	17,000	32,500	24,400	38,000	28,500
M8 x 1.50	13,900	10,400	21,200	15,900	30,400	22,800	35,500	26,600
M10 x 1.00	24,500	18,400	37,400	28,100	53,500	40,100	62,700	47,000
M10 x 1.25	23,300	17,500	35,500	26,600	50,800	38,100	59,400	44,600
M10 x 1.50	22,000	16,500	33,700	25,300	48,100	36,100	56,300	42,200
M12 x 1.25	35,000	26,300	53,400	40,100	76,400	57,300	89,300	67,000
M12 x 1.50	33,500	25,100	51,100	38,300	73,100	54,800	85,500	64,100
M12 x 1.75	32,000	24,000	48,900	36,700	70,000	52,500	81,800	61,400

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

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 Type	Series	ISO 8.8	ISO 10.9	ISO 12.0
Press in - split seam Round	CLSR	X	X	X
Press in - split seam	CLSO	X
Over mold - closed seam Round	CLCR	X
Over mold - closed seam Oval	CLCO	X
Press in or over mold Machined Round	CLMR		X
Press in or over mold Machined Headed	CLMH		X

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

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

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

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.

Thread	Class 5.8 Torque		Class 8.8 Torque		Class 10.9 Torque		Class 12.9 Torque
	Dry	Lube	Dry	Lube	Dry	Lube	Dry	Lube
M3	0.9	0.6	1.3	1.0	1.9	1.4	2.2	1.6
M3.5	1.4	1.0	2.1	1.6	3.0	2.2	3.5	2.6
M4	2.0	1.5	3.1	2.3	4.4	3.3	5.1	3.8
M5	4.0	3.0	6.2	4.6	8.8	6.6	10.3	7.8
M6	6.9	5.2	10.4	7.8	15.1	11.3	17.6	13.2
M8 x 1.00	17.9	13.4	27.2	20.4	39.0	29.3	45.6	34.2
M8 x 1.50	16.6	12.5	25.4	19.1	36.5	27.4	42.6	31.9
M10 x 1.00	36.8	27.6	56.2	42.1	80.2	60.2	94.0	70.5
M10 x 1.25	35.0	26.3	53.2	39.9	76.2	57.2	89.2	66.9
M10 x 1.50	33.0	24.8	50.6	38.0	72.2	54.2	84.4	63.3
M12 x 1.25	63.1	47.3	96.2	72.2	137.5	103.1	160.8	120.6
M12 x 1.50	60.2	45.2	91.9	68.9	131.5	98.6	153.8	115.4
M12 x 1.75	57.6	43.2	88.1	66.1	126.0	94.5	147.4	110.5

Applications

Content TBD

Standard Parts

Custom Parts

Compression Limiter – Split Seam – Round – ISO 8.8