Electrical Resistance of Type HFHB Studs Installed In Copper0 pages

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HFHB-806

Electrical Resistance Of Type HFHB Studs Installed In Copper

UNIFIED	Part Number Tested	Test Strip			Tightening Torque For All Hardware Used To Make Electrical Connections (in. lbs.)	Test Set-up Dime (Inc		nsions (See Fig. 1) les)		Resistance at 10 Amp DC Current p ohms
		Thickness t (inches)	Width w (inches)	Hardness		Test Set-up Dime (Inc		nsions (See Fig. 1) les)		Resistance at 10 Amp DC Current p ohms
		Thickness t (inches)	Width w (inches)	Hardness		hi	h2	li	1 cslcu "As Installed" Average ol 10 Samples	After Thermal Cycling (3)	After Mechanical Cycling (4)
	HFHB-032-20	.067	1.00	30 FiB	10	.380	.950	.760	1.330	99.4	103.7	102.0
	HFHB-0420-24	.067	1.00	30 FiB	21	.500	1.250	1.000	1.750	90.7	94.7	95.8
	HFHB-0518-30*	.095	1.50	45 FiF	43	.625	1.563	1.250	2.188	68.5	75.1	87.8
	HFHB-0616-32	.095	1.50	45 FiF	76	.500	1.625	1.500	2.625	41.3	44.6	62.0

METRIC	Part Number Tested	Test Strip			Tightening Torque For All Hardware Used To Make Electrical Connections (N«m)	Test Set-up Dimensions (See Fig. 1) (mm)				Resistance at 10 Amp DC Current p ohms (6)
		Thickness t (mm)	Width w (mm)	Hardness		Test Set-up Dimensions (See Fig. 1) (mm)				Resistance at 10 Amp DC Current p ohms (6)
		Thickness t (mm)	Width w (mm)	Hardness		hi	h.	li	Tested "As Installed"	Alter Thermal Cycling	Alter Mechanical Cycling
	HFHB-M5-30	1.7	25.4	30 FiB	1.3	10	25	20	35	99	103	102
	HFHB-M6-40*	1.7	25.4	30 RB	2.2	12	30	24	42	93	97	98
	HFHB-M8-50	2.41	38.1	45 RF	5.2	10	40	32	56	68	75	88
	HFHB-M10-50	2.41	38.1	45 RF	10.4	10	40	40	70	39	42	59

* Not a standard length.

NOTES:

1. Test strip material for all tests was CDA alloy

#110 Electrolytic Tough Pitch Copper.

2. Biddle Instruments Model No. 247000-

5, 10 Amp General Purpose Digital Low

Resistance Ohm meter used for all resistance

measurements.

3. Thermal cycling consisted of 10 cycles of room

temperature to 10°F (-12°C) to 150°F (66°C) and

back to room temperature. All test conducted

at room temperature.

4. Mechanical cycling consisted of 10 applications

of a clearance bushing and mating nut tightened

to the max. nut tightening torque followed by

10 applications of a pushout force equal to 75%

of pushout strength.

5. All resistance tests conducted with no external

force applied.

6. Value shown for metric sizes interpolated from

actual test results on unified series parts.

Test Strip

Test Stud

Figure 1

Self-clinching nuts (2)

(same thread size as test stud) -

MM8 PennEngineering®

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