FED-STD-H28-6A-1991 3.58.pdf
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1、FED-STD-H28/bA TH = 7777777 0003574 B W FED-S1D-H28/6A 5 March 1985 SUPERXDING EE“H28/6 31 March 1978 (See Note) FEDERAL STANDARD SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 6 GAGES AND GAGING FOR UNIFIED SCREW THREADS -UN AND UNR THREAD FORMS This standard was approved by the Assistant Admi
2、nistrator, Office o f Federal Supply and Services, General Services Administration, for the use of all Federal Agencies. Orders for this publication are t o be placed with General Services Administration, acting as an agent for the Superintendent of Documents. Single aopies o f this standard are ava
3、ilable at the GSA Business Service Centers in Boston, M A ; New York, NY; Philadelphia, PA; Washington, DC; Atlanta, GA; Chicago, IL; Kansas City, IW; Fort Worth, TX; Houston, TX; Denver, CO; San Francisco, CA; L a s Angeles, CA; and Seattle, W A ; o r from the General Services Administration, Speci
4、fication Unit (WFSIS), m o m 6039, 7th and D Streets, S . W . , Washington, DC 20407. FED-STD-H28/bA CHG NOTICE II TH H 9999977 0006863 L CHANGE N c r r I C E s ARFI NCrr(3JMmATIvE AND FED“H28/6A SHATL BE RETAINED UNTIL SUM TIME As cHANGI3 N c r r I c E 1 THE STANDARD IS msm. 27 August 1991 FEDERAL
5、STA-NDARD SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 6 GAGES AND GAGING FOR UNIFIED SCREW THREADS -UN AND UNR THREAD FORMS The following changes, which form a prt of FED-STD-H28/6A dated 5 March 1985, are apprwed by the Canmissioner, Federal Supply S e m i c e , General Senrices Administrat
6、ion, for the use of all Federal I q e n c i e s , R e M x l E : Pages 11, 12 of 5 -h 1985 Page 3: Paragraph 4.1.i.2.2 - change “TINIS, w i t h o u t e Checking to “%gether w i t h rllmimm material g a p “ . ADD: Pages 11, lla and 12 of Change Notice 1 Page 5: Paragraph 5.1.1 - QMnge “Gap8 for scmw t
7、hreads“ to “Gaps and gaging for screw t h r e a d s “ . Page 16: Paragraph 70.3 - In h e a d i n g , change “ t h r e a d g t to “W“ Page 22: Paragraph 130(a) - Chanp l l g r e a t e r than 17.11 to “less than 17.1“. peview Activities: ULA - IS M C N/A Tw6 4. Approved for p u b l i c release; distri
8、bution is u n l w t e d . -,-,- FED-STD-HZA/hA TH 7777777 0003575 T E“STD-H28/6A This Federal Standard is issued in loose leaf form t o permit the insertion or removal of new o r revised pages and Sections. All users o f Federal Standards should keep them up t o date by inserting revised o r new pag
9、es as issued and removing superseded and cancelled pages. New and revised pages will be issued under Change Notices which will be numbered consecutively and will bear the date of issuance. Change Notices should be retained and filed in front of the Standard until such time as they are superseded by
10、a reissue of the entire Standard. This section was developed t o provide Gages and Gaging f o r Unified Screw Threads f o r the Federal Services. The present issue is a complete revision of FEID-STD-H28/6 dated 31 March 1978. FED-STD-H28/6A was prepared by the Defense Industrial SupgAy Center (DM-IS
11、) and incorporates the American National Standard for Gages and Gaging f o r Unified Inch Screw Threads, ANSI/ASME B1.2-1983. Significant changes from the previous issue include the following: Replaced acceptance gaging requirements with reference t o FED-STD-H28/20. Design details and specification
12、s are given f o r a larger variety of thread gages. Limits o f size-for W tolerance thread setting rings have been added. Direct measurement of internal pitch diameter with best size balls has been added. The selection of gage contacts f o r differential gaging has been reduced t o those actually av
13、ailable. Measurement o f the diameter equivalent for variation in flank angle by differential gaging has been eliminated. Calibration requirements and standards f o r X tolerance thread gages, indicator gages, plain gages and measuring equipmnt have been added. Calibration requirements for thread an
14、d plain setting gages have also been added. The tabulation of limits of size for X tolerance gages with outside-of-product tolerance pitch diameters has been deleted and is no longer standard. Greater detail on calibration and inspection o f limit gages, snap gages, indicating gages and measuring in
15、struments has been provided. Redesignated and reapplied HI and LO gages as NOT GO gages. These gages are no longer permitted t o enter beyod 3 turns. ii FED-STD-HZd/hA TH M 7797777 0001576 L m F“STD-H28/6A SECTION 6 - GAGES AND GAGING FOR UNIFIED SCREW THREADS UNANDuNRTHREADFOEFls 1 . Scope. This se
16、ction provides the standards f o r basic gaging principles, gaging practice, gage specifications, gage dimensions, gage measurements, measuring equipment, and calibration requirements f o r Unified inch screw threads (UN and UNR thread forms). 1 . 1 Limitations. Information and requirements f o r ga
17、ging systems, their selection, and referee gaging used t o determine product thread acceptability are found in FELMTD-H28/20 and are not repeated in this section. 1 . 2 Application. This section applies to gages and measuring instruments used f o r inspection of product screw threads conforming to F
18、ED-STD-H28/20, and to their setting gages. 1.3 “ Classification. !the following classes of gages are included in this section: (1) Working gages - used during product manufacture. (2) Inspection gages - used as final conformance gages in the acceptance (3) Setting gages - used for setting and f o r
19、checking the above gages. of product. 2 . Referenced documents. 2 . 1 Government publications. The issues of the following documents in effect on the date o f invitation for bids or request f o r proposal form a part o f this standard to the extent specified herein. “- Federal standards. FED-STD-H28
20、/1 Nomenclature, Definitions and Letter Symbols for Screw Threads FED-STD-H28/2 Unified Inch Screw Threads - UN and UNR Thread Forms FED-STD-H28/20 Inspection Methods f o r Acceptability of UN, UNR, W, M and MJ Screw Threads (Activities outside the Federal Government may obtain copies o f Federal sp
21、ecifications, standards and ammercial item descriptions as outlined under General Information in the Index of Federal Specifications, Standards and Ccrranercial Item Descriptions. !the Index, which includes cumulative bi-monthly supplements as issued, i s f o r sale on a subscription basis by the Su
22、perintendent of Documents, U . S . Government Printing Office, Washington, M3 20402. -,-,- FH)-STD-H28/6A (Single aopies of this standard and other Federal specifications, standards and commercial item descriptions required by activities outside the Federal Government for bidding purposes are availa
23、ble from the General Services Administration Business Service Centers in Boston, MA; New York, NY; Philadelphia, PA; Washington, X; Atlanta, GA; Chicago, IL; Kansas City, Mo; Fort Worth, TX; Houston, TX; Denver, CO; San Francisco, CA; L o s Angeles, CA; and Seattle, W A . (Federal Government activit
24、ies may obtain copies of Federal standardization documents, and the Index o f Federal Specifications, Standards, and Ccmmercial Item Descriptions f r m established distribution points in their agencies.) 2 . 2 Other publications. The following document forms a part of this standard t o the extent sp
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