Phillips Bugle head Hi-Lo thread

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THREAD AND HOLE DIMENSIONS FOR HIGH-LOW THREAD FORMING SCREWS						*Elco,ANSI B18.6.4**
Screw	D	B	P	Pilot Hole DiameterFlexural Modulus of Plastic		MinimumTorsionalStrength,Ib.in. (STEELSCREWSONLY)
Screw	High Thread Diameter	Low ThreadDiameter	Point Diameter	Up to 200,000 P.S.I.	200,000-400,000 P.S.I.	MinimumTorsionalStrength,Ib.in. (STEELSCREWSONLY)
2-32	.084-.090	.069	.050-.058	.0670	.0700	-
4-24	.105-.115	.086	.061-.070	.0810	.0860	4
5-20	.119-.125	.100	.073-.082	.0935	.0995	9
6-19	.135-.145	.108	.080-.090	.1015	.1100	13
7-19	.148-.158	.130	.089-.100	.1200	.1250	18
8-18	.160-.170	.130	.095-.105	.1200	.1285	18
10-16	.185-.195	.145	.099-.110	.1360	.1440	30
12-16	.210-.220	.167	.125-.137	.1570	.1660	39
1/4-15	.250-.260	.200	.161-.175	.1890	.2010	56
Tolerance on Length			Up to 1 in.,Incl.:+0,-3/64		Over 1 in.:+0,-1/16

Description	A thread forming screw with a double-lead,consisting of a high and low thread.The lower threadvaries in height from 1/3 to 1/2 that of the higher thread,which is sharper and flatter than a standard thread.
Applications/Advantages	For use in plastic,nylon,wood or other low-density materials.Thread design reduces drivingtorques,enhances resistance to thread stripping,improves pullout strength and lessens risk ofcracking the work piece.
Material	Steel:1019-1022 or equivalent steel.Stainless:410 martensitic or 18-8 austenitic stainless steel
Heat Treatment	Steel:Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum.410 Stainless:Screws shall be annealed by heating to 1850-1950°F,held at least 1/2 hour and rapid air-or oil-quenched then reheating to 525°F minimum for at least 1 hour and air cooled to provide the required tensile,yield and hardness properties.
Case Hardness	Steel:Rockwell C45 minimum
Case Depth (steel)	No.2 thru 6 diameter:.002-.007 No.8 thru 12 diameter:.004-.009 1/4"diameter:.005-.011
Core Hardness	Steel (after tempering):Rockwell C28-36410 Stainless(after tempering):Rockwell C38-4218-8 Stainless:Rockwell B100(approximate)
Plating	See Appendix-A

Keywords : Phillips Bugle head Hi-Lo thread

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What are the application scenarios?

Magnesium-aluminum alloy nuts used in new energy vehicle battery boxes, reducing weight by 40%. Titanium alloy bolts applied in high-end vehicle engines, resistant to high temperature and pressure.

How is the product performance?

Self-drilling screws: Corrosion resistance improved by 3 times (e.g., through aluminum-zinc coating process), suitable for humid environments.

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Materials: Carbon steel, stainless steel, aluminum alloy, etc., with varying corrosion resistance and strength.

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