ASME B18.2.3.9M-2001 pdf download

ASME B18.2.3.9M-2001 pdf download.METRIC HEAVY HEX FLANGE SCREWS.
top surface of the head or flange; and total head height (head plus markings) shall not exceed the specified maximum head height, K maximum, plus
0.1 mm for M5 and M6 screws, 0.2 mm for N18 and M10 screws, 0.3 mm for M12 and M14 screws, and 0.4 111111 for N116 and M20 screws.
22.1 Property Class Symbols
Each screw shall be marked in accordance with the requirements of the applicable specification for its material and mechanical properties.
22.2 Source Symbols
Each screw shall be marked to identify its source (manufacturer or private label distributor).
23 FINISH
Unless otherwise specified, screws shall be supplied with a natural (as processed) finish, unpiated or Un- coated, in a clean condition, and lightly oiled.
24 WORKMANSHIP
Screws shall be free from surface imperfections such as burrs, seams, laps, loose scale, and other surface irregularities that could affect serviceability and shall conform to ASTM F 788/F 788M.
25 INSPECTION AND QUALITY ASSURANCE
Unless otherwise specified. acceptability of screws shall he determined in accordance with ASME
B 18.18.1 M.
26 DIMENSIONAL CONFORMANCE
Products shall conform to the specified dimensions. Unless otherwise specified, the following provisions shall apply for inspection of dimensional characteristics:
(a) Unless otherwise specified, the following designated dimensional characteristics shall be inspccted to the inspection levels shown according to ASME Bl8.18.2M.
A6 FILLETS
B 18.2.3.9M Table 3 minimum fillet transition diameters and shorter maximum fillet lengths for screws
threaded full length are not specified in ISO/DIS 8102.
For Type U fillet, the radius of the fillet extension,
i reference in ISO/DIS 8102, is not specified in
B 1 8.2.3.9M.
A7 BODY DIAMETER FOR SCREWS THREADED FULL LENGTH
B18.2.3.9M Tables 3 and 4 minimum diameters of unthreaded shank for screws threaded full length are not specified in ISO/DIS 8102.
A8 REDUCED DIAMETER BODY
B18.2.3.9M Table 6 maximum and minimum diameters of reduced body differ from ISO 8102 “d2 is approximately equal to the pitch diameter (rolling diameter).” The limits specified in B18.2.3.9M Table 6 were proposed to ISO/TC2/WG2 in May 1995. but ISO/ TC2/WG2 was not willing to specify limits for the rolling diameter.
A9 POINT
B I 8.2.3.9M para. 17 and Table 5 optional rounded point is not in ISO/DIS 8102, but Table 8 agrees with ISO 4753.
AlO STRAIGHTNESS
B 18.2.3.9M specifies straightness at maximum material condition, as in ISO/DIS 4759-I: May 1998, instead of regardless of feature size, as in ISO 4759/1-1978. The formula in B18.2.3.9M results in straightness tolerance zone diameters that are smaller for lengths 12 mm and shorter, and larger for lengths 16 mm and
A13 POSITION OF BODY-TO-THREAD
Coaxiality or position of the body with respect to the thread, specified in ISO 4759/I or ISO/DIS 4759- 1, is not specified in B18.2.3.9M.
A14 MARKING
B18.2.3.9M para. 22 allows markings on the top of the flange but not on the side of the head, as alternatives to markings on the top of the head, while ISO 898-1 allows markings on the side of the head but not on the top of the flange. B18.2.3.9M para. 22 dimensions of head markings are not specified in ISO/DIS 1O2 or ISO 898-1.
A15 INSPECTION AND QUALITY ASSURANCE
B18.2.3.9M paras. 25 and 26 inspection and quality assurance provisions differ from those in ISO/DIS 8102.