ASME B18.2.9-2010 pdf free

ASME B18.2.9-2010 pdf free.Straightness Gage and Gaging for Bolts and Screws.
ASME B18.2.9 describes the gage and procedure for checking bolt and screw straightness at maximum material condition (MMC) and provides default limits when not stated in the applicable product standard.
2 COMPARISON WITH ISO 4759-1:2000
This Standard uses an adjustable gage, instead of plain sleeve gages like the example shown in ISO 4759-1 Annex C, Fig. C.24. The adju.table gage avoids the necessity of a different gage for each diameter—length combination, and for each difference in the specified tolerances on diameter, or straightness, or both, of the fastener.
3 REFERENCED STANDARDS
For undated references, the most recent issues of the referenced standards apply.
ASME B18.12, Glossary of Terms for Mechanical Fasteners
ASME Y145M, Dimensioning and Tolerancing
Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007 (www.asme.org)
ISo 4759-1:2000 Tolerances for fasteners — Part I: bolts, screws, studs, and nuts — Product grades A, B and C’
Publisher: International Organization for
Standardization (ISO), 1, ch. de Ia Voie-Creuse, Case
Postale 56, CH-1211 Genève 20, Switzerland/Suisse
(www.iso.org)
4 TERMINOLOGY
For definitions of terms relating to fasteners or features thereof used in this Standard, refer to ASME B18.12.
5 DIMENSIONS
For definitions of terms relating to dimensioning and tolerancing, refer to ASME Y14.5M.
6 GAGE
The gage consists of a stationary rail, an adjustable rail, micrometers that indicate the distance between the rails at each end, and a means to secure the adjustable rail in place. A typical gage is illustrated in Fig. 1.
7 PROCEDURE
(a) The excluded length, illustrated in Fig. 2, is the length, iIan that is to he excluded from the straightness gage, as specified by the product standard.
(Ii) The gaged length, illustrated in Fig. 2, is calculated as the bolt or screw length minus the excluded length.
(c) The straightness tolerance at MMC for the product to be inspected is calculated for the gaged length by the formula specified in the product standard.
(d) The resultant condition is calculated as the larger of the maximum major diameter of the thread or the maximum body diameter of the bolt or screw, plus the straightness tolerance at MMC.
(e) The adjustable rail of the gage is adjusted to pro‘ide a parallel space between the rails equal to the resultant condition by obtaining common readings on both micrometer heads, and is secured in place.
(f) The gaged length of the product to be inspected is inserted between the rails, then rotated by hand through a full 360 deg. Any interference occurring between the product and the gage sufficient to prevent rotation indicates that the specified straightness is not met.
8 STRAIGHTNESS LIMITS
Unless otherwise specified in the product standard or by the purchaser, the straightness limits for all types of screws and bolts are listed in Table 1.ASME B18.2.9 pdf free download.