ASME B18.6.2-2020 pdf download

ASME B18.6.2-2020 pdf download.Square Head Set Screws and Slotted Headless Set Screws(lnch Series).
1.6 References
The following is a list of publications referenced in this Standard. Unless otherwise specified, the latest edition shall be used.
ASME B 1.1, Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms)
ASME B1.3, Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ)
ASM E B18. 12, Glossary of Terms for Mechanical Fasteners
ASME B18.18, Quality Assurance for Fasteners
ASME B18.24, Part Identifying Number (PIN) Code System Standard for BiB Fastener Products
Publisher: The American Society of Mechanical Engineers (ASME), Two Park Avenue, New York, NY 10016-5990 (www.asme.org)
ASTM A380/A380M, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
ASTM F1941/F1941M, Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
Publisher: American Society for Testing and Materials
(ASTM International), 100 Barr Harbor Drive, P.O.
Box C700, West Conshohocken, PA 19428-2959
(www.astm.org)
1.7 Part Identifying Number
For a Part Identif’ing Number, refer to ASME B18.24.
2 GENERAL DATA FOR SQUARE HEAD SET SCREWS
2.1 Heads
2.1.1 Head Height. The head height is measured, parallel to the axis of the screw, from the top of the head to the intersection of the side of the head with the undersurface.
2.1.2 Width Across FLats. The maximum width across flats shall not be exceeded. However, on milled-from-bar, nonferrous screws, the maximum limit may conform to commercial tolerances of the bar stock material.
2.6.3 Other MateriaLs. When specified by the purchaser, square head set screws may be made from corrosion resistant steel or nonferrous metals. The materials and properties shall be as agreed upon between the manufacturer and purchaser.
2.7 Finishes
Unless otherwise specified, bolts and screws shall be supplied with a plain (as-processed) finish, unpiated or uncoated. Light oil on the surface is permissible to avoid corrosion during transportation, packaging, and further handling. If square head set screws are electroplated, they shall be suitably treated to minimize hydrogen embrittlement.
2.8 Workmanship
Square head set screws shalL be free from burrs, seams, laps, loose scale, and any other defects that could affect their serviceability.
2.9 QuaLity Assurance
Manufacturers shall provide screws in accordance with ASME B18.18, Category 2.
2.10 Designation
Square head set screws shall be designated by the following data, preferably in the sequence shown:
product name; nominal size (number, fraction, or decimal equivalent); threads per inch; screw length (fraction or decimal equivalent); point style; material; protective finish, if required.
EXAMPLES:
(1) Square Head Set Screw, ASME B18.6.2, 1/4 — 20 x 3/4, Flat Point, Case-Hardened Steel, Zinc plated per ASTM F1941/ F1941M Fe/Zn SC
(2) Square Head Set Screw, ASME B18.6.2, 0.250 — 20 x 075, Cup Point, Through Hardened Steel, Zinc plated per ASTM F1941/F1941M Fe/Zn 3AN
(3) Square Head Set Screw, ASME B 18.6.2, 0.500 — 13 x 1.25, Cone Point, 303 Corrosion Resistant Steel, Hardness 70 — 95 HRB, Passivated per ASTM A380/A380M
3 GENERAL DATA FOR SLOTTED HEADLESS SET SCREWS
3.1 HeadLess Ends
3.1.1 End Configuration. The slotted end of screws may be crowned as shown and dimensioned in Table 3.1.1-1 or may be flat, at the option of the manufacturer.
3.1.2 SLot Depth. The slot depth in slotted headless set screws shall be measured, parallel to the axis of the screw, from the end of the screw to the intersection of the bottom of the slot with the thread major diameter.
3.3.2 Thread Gaging. Unless otherwise specified, dimensional acceptability of screw threads shall be determined based on System 21, ASME B 1.3.
3.4 Thread Length
Slotted headless set screws shall have complete (fullform) threads extending over the portion of the screw length that is not affected by the point or the crown on the headless end. Threads through angular or crowned portions of length shall have fully formed roots with partial crests.
3.5 Points
3.5.1 Point Types. Unless otherwise specified, slotted headless set screws shall be supplied with cup points. When specified by the purchaser, screws shall have cone, dog, half-dog, flat, or oval points conforming to specifications in Table 3.1.1-1.
3.5.2 Point AngLes. The external point angles specified shall apply only to the portions of the point that lie below the thread root diameter, as angles within the thread profile may vary due to manufacturing processes.