SL- SS High-Low Style THREAD FORMING

1 25 SELF- TAPPING SCREWSTHREAD FORMINGT hread and hole dimensions for High-Low THREAD FORMING screwsElco*, ASME SizeDBPP ilot Hole DiameterFlexural Modulus of PlasticMinimum Torsional Strength, lb. in. (STEEL SCREWS ONLY)High THREAD DiameterLow THREAD DiameterPoint DiameterUp to 200,000 ,000-400,000 - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . on LengthUp to 1 in., Incl.: +0, -3/64 Over 1 in.: +0, -1/16 DPBD escriptionA THREAD FORMING screw with a double-lead, consisting of a high and low THREAD . The lower THREAD varies in height from 1/3 to 1/2 that of the higher THREAD , which is sharper and flatter than a standard AdvantagesFor use in plastic, nylon, wood or other low-density materials.

2 THREAD design reduces driving torques, enhances resistance to THREAD stripping, improves pullout strength and lessens risk of cracking the work : 1019-1022 or equivalent steel. Stainless: 410 martensitic or 18-8 austenitic stainless steelHeat TreatmentSteel: Screws shall be quenched in liquid and then tempeared by reheating to 650 F Stainless: An ideal method of hardening 410 stainless screws is a bright hardening process, which typically involves a vacuum furnace. Another key factor affecting hardness is the chemistry of the fastener--most elements have maximum values but not minimums. This fact can contribute to hardness HardnessSteel: Rockwell C45 minimumCase Depth (steel)No.

3 2 thru 6 diameter: .002 - .007No. 8 thru 12 diameter: .004 - .0091/4 diameter and larger: .005 - .011 Core Hardness Steel (after tempering): Rockwell C28 - 36410 Stainless: Rockwell C38 - 46 (approx.)18-8 Stainless: Rockwell B100 (approx.)PlatingSee Appendix-A* Elco is the original writer of High-Low screw dimensionsHigh-Low StyleThis page prints with a watermark26 SELF- TAPPING SCREWSHEAD DIMENSIONS head & drive dimensions for hex washer High-Low Nominal SizeATJHFUW idth Across FlatsSlot DepthSlot WidthHeight of HeadDiameter of WasherThickness of & drive dimensions for PhilliPs flaT High-Low Nominal SizeAHMGD river SizeHead DiameterHead HeightRecess DiameterRecess Penetration Gaging Stylehead & drive dimensions for PhilliPs flaT UndercUT High-Low Nominal SizeAHMGD river SizeHead DiameterHead HeightRecess DiameterRecess Penetration Gaging & drive dimensions for PhilliPs

4 Hex washer High-Low Nominal SizeAHFUTD river SizeWidth Across FlatsHeight of HeadDiameter of WasherThickness of WasherRecess Penetration Gaging RingThis page prints with a watermark27 SELF- TAPPING SCREWSHEAD DIMENSIONSHigh-Low Stylehead & drive dimensions for six-lobe Pan High-Low screwsNominal SizeAHRGF allaway Gauge PenetrationDriver SizeHead DiameterHead HeightRecess DiameterRecess Gauge Penetration & drive dimensions for TrUss PhilliPs High-Low Nominal SizeAHMNGD river SizeHead DiameterHead HeightRecess DiameterRecess WidthRecess Penetration Gaging & drive dimensions for six-lobe flaT High-Low screwsNominal SizeAHRGF allawayDriver SizeHead DiameterHead HeightRecess DiameterRecess Gauge Penetration MHMAGAThis page prints with a watermark28 SELF- TAPPING SCREWSHEAD DIMENSIONSHigh-Low Stylehead & drive dimensions for PhilliPs Pan High-Low Nominal SizeAHMGD river SizeHead DiameterHead HeightRecess DiameterRecess Penetration Gaging & & drive dimensions for Pozi Pan High-Low Nominal SizeAHMGD river SizeHead DiameterHead HeightRecess DiameterRecess Penetration Gaging & drive dimensions for six-lobe flaT UndercUT High-Low Nominal SizeAHBRD river SizeHead DiameterHead HeightRecess DiameterRecess Penetration Gaging page prints with a watermark