1、FEDERAL SPECIFICATION FF-S-210B July 16,1981 SUPERSEDING Fed. Spec. FF-S-210A October 24, 1969 (See 6.5) SETSCREWS: SQUARE HEAD (INCH) AND SLOTTED HEADLESS (INCH AND METRIC) This specificat10n was approved by the Comm1ss1oner, Federal Supply Serv1ce, General Services Administration, for the use of a
2、ll Federal Agencies. 1. SCOPE AND CLASSIFICATION 1.1 Score. This specification covers square head (inch) and slotted headless setscrews inch and metric). See 6.1 for recommended style usage limitation. 1.2 Classification. 1.2.1 Types. Setscrews shall be of the following types, as specified (see 6.2)
3、. Type I - Square head, inch dimensions Type II - Slotted headless, inch dimensions Type III - Slotted headless, metric dimensions 1.2.2 Styles. Setscrews shall be of the following styles, as spec1fled (see 6.2). Style 1 - Flat point Style 2 - Cone point Style 3 - Oval point Style 4 - Cup point Styl
4、e 5 - Full-dog point Style 6 - Half-dog point 1.2.3 Size. Setscrews shall be class1fled by Slze 1n accordance with the basic major dlameter of the thread (see 6.2). 1.2.4 Length. Setscrews shall be of the length specified in 6.2. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issues in
5、effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein: FSC 5305 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B Federal Speclf1cations QQ-B-637 QQ-N-281 QQ-P-416 QQ-W
6、-321 PPP-H-1581 - Brass, Naval: Rod, W1re, Shapes, Forgings and Flat Products w1th Finlshed Edges (Bar, Flat Wire, and Strip) - Nickel-Capper-Alloy Bar, Rod, Plate, Sheet, Strip, Wire, Forging, and Structural and Special Shaped Sections - Platlng, Cadmlum (E1ectrodeposlted) - Wlre, Copper Alloy - Ha
7、rdware (Fasteners and Related Items), Packaging and Packing for Shipment and Storage of Federal Standards FED-STD-66 FED-STD-151 FED-STD-H28/2 - Steel, Chemical Composition and Hardenability - Metal, Test Methods - Screw-Thread Standards for Federal Services, Section 2, Unified Thread Form and Threa
8、d Series for Bolts, Screws, Nuts, Tapped Holes and General Applications FED-STD-H28/21 - Screw-Thread Standards for Federal Services, Section 21, 1etrlc, Screw-Threads (Activities outslde the Federal Government may obtain copies of Federal speclfications, standards, and commercial item descriptions
9、as outlined under General Informatlon 1n the Index of Federal Specificatlons, Standards and Commercial Item Descrlptions. The Index, which includes cumulative bimonthly supplements as lssued, is for sale on a subscription basls by the Superlntendent of Documents, U.S. Government Printing Office, Was
10、hington, DC 20402. (Slng1e caples of thlS speclflcatlon, other Federal speclficatl0ns, and com merclal item descrlptl0ns required by actlvltles outside the Federal Government for biddlng purposes are avallable without charge from General Servlces Admln istration Business Service Centers in Boston; N
11、ew York; Washlngton, DC; Phi1a delphla; Atlanta; Chicago; Kansas City, MO; Fort Worth; Houston; Denver; San Francisco; Los Angeles; and Seattle, WA. (Federal Government activitles may obtaln copies of Federal speclfications, standards, and commercial ltem descriptlons, and the Index of Federal Specl
12、fi catl0ns, Standards, and Commercla1 Item Descrlptlons from established distrl butl0n points in their agencies.) “l itary Speclflcatlons MIL-F-495 - Finish, Chemical, Black, for Copper Alloys MIL-H-6875 - Heat Treatment of Steels (Aircraft Practlce), Process for MIL-C-13924 - Coating, Oxide, Black,
13、 for Ferrous Metals MIL-I-17214 - Indicator, Permeabl11ty; Low-Mu (Go-No Go) 2 -Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B Military Standards MIL-STD-105 0551409 0551410 OS51411 - Sampllng Procedures and Tables for Inspectlon by Attrlb
14、utes - Setscrew, Slotted Headless, Cone POlnt, Carbon Steel, Cadmlum Plated, Metric - Setscrew, Slotted Headless, Cup Point, Carbon Steel, Cadmium Plated, Metric - Setscrew, Slotted Headless, Flat POlnt, Carbon Steel, admium Plated, Metric (Copies of Military specifications and standards required by
15、 contractors 1n connection with specific procurement functions should be obtalned from the procurlng actlvlty or as dlrected by the contracting offlcer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified here,n. Unless a speclflc 1ssue 1S ident
16、,fled, the issue In effect on date of invltatlon for bids or request for proposal shall apply. American National Standards Institute (ANSI) Standard: ANSI BI8.6.2 - Slotted Head Cap Screws, Square Head Set Screws, and Slotted Headless Set Screws (Appllcatlon for copies should be addressed to the Ame
17、rican National Standards Institute, 1430 Broadway, New York, NY 10018.) Amerlcan Society for Testing and Materials (ASTM) Standards: Asnl E18 ASTM A380 Rockwell Hardness and Rockwell Superflclal Hardness of Metall,c Materlals, Test For - Cleanlng and Oescaling Stainless Steel Parts, Equipment and Sy
18、stems (Appllcation for copies should be addressed to the Amerlcan Society for Testing and Materlals, 1916 Race Street, Philadelphia, PA 19103.) 3. REQUIREMENTS 3.1 Materlal. Recycled and reclaimed materlals shall be used to the maximum extent practicable. Setscrews shall be made of one of the follow
19、ing materials, as specified (see 6.2). 3.1.1 Low-carbon steel. Low-carbon steel shall be composltion 1010 thru 1020 or free machining low-carbon steel, composition 1112, 1113 and leaded steels in accordance with FED-STD-66. 3.1.2 Medium-carbon steel. Medium-carbon steel shall be composition 1035 thr
20、u 1045 or 1137 thru 1144 in accordance with FED-STD-66. 3.1.3 Alloy steel. Alloy steel shall be composition 4032,4037, 4137,4140, 8630, 8740 or equivalent in accordance with FED-STD-66, which can be heat treated in accordance with MIl-H-6875 to meet the hardness requirement of 3.3. 3 Provided by IHS
21、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B 3.1.4 Corrosion-reslstant steel. 3.1.4.1 Austen1t1c. Austen1t1c corrOSlon-reslstant steel shall be of the 300 Serles in accordance with FEO-STO-66 or any other austen1tic corrOS1on resistant steel developed
22、for cold heading or free machining. 3.1.4.1.1 Magnetic permeab1l,ty. Austenitlc corrosion-resistant steel setsrs shah magnetlc permeabllity of 2.0 max (air = 1.0) for a field strength of H = 200 oersteds (16 kA/m) when using a magnetic indlcator in accordance with rlIL-I-17214. 3.1.4.2 1artensitic.
23、r1artensitic corrosion-reslstant steel shall be steel nos. 410 or 416 in accordance with FED-STD-66. 3.1.5 Brass. Brass shall be in accordance with alloy no. 462 of QQ-B-637 or alloy nos. 260, 270 and 274 of QQ-W-321. 3.1.6 NiCkel-copper alloy. Nickel-copper alloy shall be ln accordance with QQ-N-28
24、1. 3.2 Protectlve finish. Unless otherwise spec1fied (see 6.2), setscrews shall be furnished uncoated. When specified (see 6.2), protectlve fin1shes shall be as follows. 3.2.1 Cadmlum platlng. Carbon and alloy steel setscrews shall be cadmlum plated in accordance wlth QQ-P-416, type II, class 3 (0.0
25、002 In. thlck or 5.1 pm thlCk). 3.2.2 Passlvation. Corrosion-resistant steel setscrews shall be passlvated in accordance wlth ASTM A380. 3.2.3 Black oxide. 3.2.3.1 Brass. Brass setscrews shall be black oxide coated in accordance with MIL-F-495. 3.2.3.2 Corros10n-resistant steel. Corros10n-resistant
26、steel setscrews shall be black oxide coated in accordance with MIL-C-13924, class 4. 3.2.4 Hydrogen embrittlement. Cadmlum plated alloy steel setscrews shall be subJected to an embrittlement relief treatment in accordance with QQ-P-416 as soon as possible after plating to m1nimize the resulting embr
27、lttlement. 3.3 Hardness. Alloy steel setscrews shall be hardened by heat treatment to 45-53HRC. Low and medium carbon steel setscrews shall be hardened by heat treatment to 30-37HRC or shall be surface hardened to not less than 64HR30N. Martensitic corrosion-resistant steel setscrews shall be harden
28、ed by heat treatment to 35-45HRC. 3.3.1 Decarburization. The complete and partial decarburization of the threads of heat-treated setscrews shall not exceed the amounts shown in figure 1 or the amount for any other class as may be specified in the contract or order. A carbon content throughout the th
29、reads equivalent to that of the core is desirable. 4 . , -Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B 3.4 Design. 3.4.1 Dimensions. Dimensions and tolerances of setscrews with inch dimensions shall be in accordance with ANSI B18.6.2. Sl
30、otted setscrews with metric dlmensions shall be in accordance with applicable Military Standards. 3.4.2 Threads. Unless otherwise specified (see 6.2), the inch system threads shall be class 2A in both UNC and UNF series in accordance with FED-STD-H28/2. Metric syst threads shall be “M“ profile toler
31、ance class 69, before coatlng or platln9 in accordance with FED-STD-H28/21. 3.5 Workmanship. Setscrews shall be free from burrs, seams, laps, loose scale, irregular surfaces and any other defects WhlCh may affect servlceability. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responslbilit for inspection. Unles
32、s otherwise specifled ln the contract or purchase order. t e contractor is responsible for the performance of all lnspectlon requirements as specified herein. Except as otherwise specified in the contract or order, the contractor may use his own or any other facilities suitable for the performance o
33、f inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the lnspections set forth in the specification where such inspections are deemed necessary to assure that supplles and services conform to prescribed requirements. 4.
34、2 Inspection provlsions. 4.2.1 Lot. A lot shall consist of all setscrews of the same type, style, material, protective finish, size and thread produced under essentially the same conditions and offered for acceptance at one time. 4.2.2 Sampling for examination. A random sample of setscrews shall be
35、taken from each lot in accordance with MIL-STD-I05, inspection level II. The Acceptable Quality Level (AQL) shall be as specified in table I. 4.2.3 Sampling for hardness and decarburlzation tests. A random sample of setscrews shall be taken from each lot in accordance with MIL-STD-I05, inspection le
36、vel S-l, with an AQL of 1.0 percent defective. 4.2.4 Sampling for protective finish tests. Sampllng for tests of protective finishes shall be in accordance with the applicable specifications in 3.2. 4.2.5 samPlinr for chemical analysis. When specified (see 6.2), a random sample of setscrews sha , be
37、 taken from each lot in accordance with MIL-STD-I05, lnspection level S-1, with an AQL of 1.5 percent defective. Samples previously selected for examination or for the hardness and decarburization tests may be used. 4.2.6 Sampling for examination of packaging and packing. Sampling for examination of
38、 packaging, packing and marking shall be in accordance with PPP-H-1581. 4.3 Examination. Each setscrew taken as specifled in 4.2.2 shall be examined to verify confonmance with this specification. Examination shall be conducted in accordance with table I. Any setscrew in the sample containing one or
39、more defects shall be rejected and if the number of defective setscrews in any sample exceeds the acceptance number for that sample, the lot represented by the sample shall be rejected. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B TABL
40、E I. Classlficat;on of defects. Categories Defects Inspection method Critical None Defi ned Major AQL = 2.5 101 Thread SIE* 102 Width across flats SIE Minor AQL = 4.0 201 Thread length SIE 202 Applicable point dimensions SIE 203 Setscrew length SIE 204 Other dimensions SIE 205 Eccentriclty SIE 206 W
41、orkmanshlp (see 3.5) Vl sua 1 207 1agnetic penneabil ity (see 3. 1. 4 1.1 ) SIE *SIE = Standard inspection equlpment 4.4 Tests. 4.4.1 Hardness. Each setscrew taken as speclfled ln 4.2.3 shall be subJected to a hardness test in accordance with ASTM E18. a. Setscrews, havlng a length of 2 diameters or
42、 longer, shall be tested on a transverse sectlon through the threads at a pOlnt one-quarter of the nominal diameter from the axis and one nomlnal dlameter from the point. b. Setscrews having a length less than 2 diameters shall be tested on a transverse sectlon through the threads at a point one-qua
43、rter of the nomlnal diameter from the axis and located at the flrst full thread from the point. c. Setscrews havlng nominal dlameters of 1/4“ (6 mm) and larger shall be tested using the Rockwell C scale. For sizes smaller than 1/4“ (6 mm) the Rockwell 30N scale shall be used. 4.4.2 Decarburlzat;on E
44、ach setscrew taken as speclfied in 4.2.3 shall be sub jected to a decarburizatlon test conducted as follows: The threaded part of the setscrew shall be sectioned longitudinally through the axis and polished so that rounding of the thread edges ;s held to a minimum. The section shall be etched with t
45、he usual metallographic etchants (such as nital) and examined wlth a metal lurgical microscope. Measurements shall be made from the crest of the thread to the end of the decarburized zone. This distance shall not exceed that indicated in figure 1 for inch and metric setscrews. Measurements shall be
46、made with a fixed-scale micrometer eyeplece. This test does not apply to austenitic corrOSlon resistant steel. 6 -Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1/4H Inch Thds 1/4 H 1/ per lnch lnches 80 .002 72 .002 64 .003 56 .003 48 .003 44 .004
47、40 .004 36 .005 32 .005 28 .006 24 .007 20 .008 18 .009 16 .010 14 .012 13 .012 12 .014 11 .015 10 .016 9 .018 8 .020 7 .023 6 .027 1/ 1/4 H = 1/4 BASIC THREAD DEPTH Thread Pitch 0.30 0.40 0.45 0.50 0.70 0.80 1.00 1.25 1.50 1. 75 2.00 2.50 3.00 FF-S-210B PARTIAL DECARBURI ZATION ZONE -FULL CARBON ZO
48、NE 1etr;c 1/4 H 11 mm 0.047 0.054 0.061 0.068 0.095 0.108 0.135 0.169 0.203 0.237 0.271 0.338 0.406 11 1/4 H = 1/4 BASIC THREAD DEPTH FIGURE 1. Oecarburization limits. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-210B 4.4.3 Protect1ve finis
49、h. Protective finish tests shall be conducted 1n accordance with the applicable specif1cations in 3.2. 4.4.4 Chemical analysis. Each setscrew selected as specified in 4.2.5 shall be subjected to a chemical analys1s conducted in accordance with FED-STD-151 to ver1fy conformance to the applicable mater1al speciflcation. A steel mill certi fication will be acceptable 1n lieu
