1、FF-S-72B 53 M 7777774 0004005 2 FF-S-92B August 27, 1974 SUPERSEDING FF-S-92a January 26, 1965 FEDERAL SPECIFICATION SCREW, MACHIHE: SLOTTED, CROSS-REEESSED OR HEXAGON HEAD This specification was approved by the Commissioner, Federal. Supply Service, General Services Administration, for the use of a
2、ll Federal Agencies. 1 .- SCOPE AND CLASSIFICATION 1.1 Scope. This specification covers slotted, cross-recessed and hexagon head machine screws. 1.2 Classification. and styles 77- 1.2.1 ?!y e and style. Machine screws shall be of the following types Type I - Slotted (see fig. 1) Style Is - Rourid he
3、ad . Style 6s - Oval head, 82O Style 2s - Flat head, 82O Style 7s - Truss head Style 3s - Flat head, 1000 Style 8s - Binding head Style 4s - Fillister head Style 9s - Pan head Style 5s - Fillister head, Style 10s - Hexagon head drilled “pe II - Hexagon, Plain ( see fig. 1) Style 1Op - Hexagon Type I
4、II - Cross-Recessed, Recess Designs I and II (see fig, 2). Style IC - Round head Style 6c - Oval head, 820 Style 2c - Flat head, 82O Style 7c - Truss head Style 3c - Flat head, 100 Style 8c - Binding head Style kc - Fillister head Style 9c - Pan head NOTE: Use of cross-recess design II is not recomm
5、ended. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-92B 1.2.2 Size. Machine screws shall be classified according to size by the ncminal dimeter of the body. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date o
6、f invi- tation for bids or request for proposal, form a part of this specification to the extent specified herein. Federal Specifications : QQ-A-200/3 - QG$A-225/6 - QQ-B-613 QQ-B-626 QQ-B-637 QQ-13-728 QQ-B-750 QQ-C-586 QQ-C-591 QQ-N-281 QQ-N-286 QQ- P-35 QQ- P-416 . QQ-S-634 QQ-S-637 QQ-5-763 QQ-W
7、- 321 QQ-2-325 PPP-H-I. Aluminum Alloy Bar Rod, Shapes , Tube and Wire , E)xtrude Rolled , Drawn or Cold Finished, 2024. Brass, Leaded and Non-Leaded; Flat Products (Plate, Bar, Sheet and Strip). Brass, Leaded and Non-Leaded: Rod, Shapes, For ings and Flat Products and Finished Edges (Bar and Strip
8、f b Brass, Naval: Rod, Wire, Shapes, Forgings and Flat Products with Finished Edges (Bar , Flat Wire and Strip). Bronze, Manganese: Rod, Shapes, Forgin s and Flat Products (Flat Wire, Strip, Sheet, Bar and Plate 7 . Bronze, Phosphor ; Bar , Plate , Rod, Sheet , Strip, Flat Wire and Structural and Sp
9、ecial Shaped Sections, Copper-Nickel-Zinc Alloy; Rod, Shapes and Flat Products with Finished Edges (Flat Wire, Strip and Bar), Copper-Silicon, Copper-Zinc-Silicon and Copper-Nickel- Silicon Alloys: Rod, Wire, Shapes, Forgings and Flat Products (Flat Wire, Strip, Sheet, Bar and Plate) . Nickel-Copper
10、 Alloy: Mr , Plate , Rod, Sheet, Strip, Wire, Forgings and Structural and Special Shaped Sections. Nickel-Copper-Aluminum Allqy, Wrought, Passivation Treatments For Corrosion-Resisting Steel. Plating, Cadmium (Electrodeposited) . Steel Bar, Carbon, Cold Finished (Standard Quality) . Steel Bar Carbon
11、, Cold Finished (Standard Quality, Free Machining 5 , Steel Bars, Wire, Shapes and Forgings, Corrosion-Resisting, Wire, Copper Alloy. Zinc Coating , Electrodeposited , Requirements For , Hardware (Fasteners and Related Items) , Packaging and Packing For Shipnent and Storage of, Federal Standards: Fe
12、d. Std. No. 66 - Steel : Chemical Composition and Hardenabilty. Fed. Sed. No. 123 - Marking For Dmestic Shipnent (Civil Agencies). Fed. Test Method Std. No. 151 - Metals; Fest Methods 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-72B 53 M 77
13、77771.1 OOOL1007 b M FF-S-92B (Activities outside the Federal Government may obtain copies of Federal Specifications and Standards as outlined under General Information in the Index of Federal Specifications and Standards and at the prices indicated in the Index. The Index, which includes cumulative
14、 monthly supplements as issued, is for sale on a subscription basis by the Superintendent of Documents, U.SGovernment Printing Office, Washington, D.C. 20402 (Single copies of this specification and other product specifications required by activities outside the Federal Government for bidding purpos
15、es are available without charge at the General Services Administration Regional Offices in Boston, Nm York, ldashingt_bn, DG, Atlanta, Chicago, Kansas city, Mo, Fort Worth, Denver, San Francisco, Los Angeles, and Seattle, WA. (Federal Government activities may obtain copies of Federal Specifications
16、 and Standards and the Index of Federal Specifications and Standards fram established distribution points in their agencies. ) Military Specifications: MIL-F-495 MIL-A-8625 MIL-C-13924 1-16232 MIL-1-17214 MIL-M-20693 MIL-B-24059 MI-81562 - Finish, Chemical, Black, For Copper Alloys. - Anodic Coating
17、s, For Aluminum and Aluminum Alloys. - Coating, Oxide, Black, For Ferrous Metals. - Phosphate Coatings, Heavy, Manganese or Zinc Base (For - Indicator, Permeability; Law-MU (Go-No Go). - Molding Plastic, Polyamide (Nylon), Rigid. - Bronze, Nickel Aluminum; Rod, Flat Products with Finished - Coatings
18、, Cadmium, Tin-Cadmium and Zinc (Mechanically Ferrous Metals ) . Edges, Shapes and Forgings. Deposited). Military Standards: MIL-STD-105 - Sampling Procedures and Tables for Inspection by.Attributes. MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-1312 - Fasteners, Test Methods. 183.16 - - B
19、olt, Bolt-Stud, Stud, Stud-Bolt; Nickel-Copper-Aluminum Alloy; Special Requirements. Slotted, Plastic (Nylon). ml8211 - Screw, Machine - 80 and looo, Flat Countersunk Head, 18212 - Screw, Machine - Pan Head, Slotted, Plastic (Nylon), UNC-2A. (Copies of specifications, standards, drawings and publica
20、tions required by suppliers in connection with specific procurenent functions should be obtained from the procuring activity or as directed by the contracting offi Cer. ) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-92B 2.2 Other publicatio
21、ns. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the fssue in effect on date of invitation for bids or request for proposal shall apply. National Bureau of Standards Handbook: 28, Part I - Screw-Thread Standards For Federal Ser
22、vices. (Application for copies should be addressed to the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. ) American National Standards Institute (ANSI) Standard: ANSI 18.6.3 - Machine Screws and Machine Screw Nuts . (Application for copies should be addressed t
23、o the Amerfcan National Standards Institute, 1430 Broadway, New York, N.Y. 10018.) 3.1 Materials. Unless otherwise specified (see 6.2), screws shall be made of the materials specified in 3.1.1 through 3.1.9. 3.1.1 Carbon steel. Carbon steel shall be in accordance with QQ-S-634, QQ-S-637 or Fed. Std.
24、 No. 66. Capped or rimmed steels shall be permitted. !the minimum ultimate tensile strength shall be 60,000 PSI. 3.1.2 Corrosion-resisting steel. Corrosion-resisting steel shall be the 300 series in accordance with &-S-763 and Fed. Std. No. 66 or equal to or interchangeable with 16-18 or 18-8 chromi
25、um nickel alloy steel (devel- oped for cold heading). The minimum ultimate tensile strength shall be &,O00 PSI. Straight chromium alloys of the 400 series shall not be used. 3.1.2.1 Magnetic permeabilitx. Corrosion-resisting steel screws shall have a magnetic permeability of 2 .O maximum (air = 1.0)
26、 for a field strength of H = 200 oersteds using a magnetic indicator per MIL-1-17214 3.1.3 Brass . Brass shall be in accordance with QQ-B-613 9 QQ-B-626 or QQ-W-321, The minimm ultimate tensile strength shall be 55,000 PSI, 3.1.4 Aluminum alloy, Aluminum alloy, 2024, shall be in accordance with- QQ-
27、A-200/3 or QQ-A-225/6. “he minimum ultimate tensile strength shall be 62,000 PSI. 3.1.5 Copper alloys. Copper alloys shall be in accordance with QQ-B-637, QQ-1-728, QQ-B-750, QQ-C-586 or QQ-C-591. The mechanical PmpertieS shall be as specified in Table II . 4 Provided by IHSNot for ResaleNo reproduc
28、tion or networking permitted without license from IHS-,-,-3.1.6 Nickel-copper alloy. Nickel-copper alloy shall be in accordance with QQ-N-281, Class A. The mechanical properties shah1 be as specified in !Lable II. 3.1.7 Nickel-copper-aluminum alloy. Nickel-copper aluminum alloy shall be in accordanc
29、e with QQ-N-286, Class A. The mechanical properties shall be as specified in Table II. 3.1.8 Nickel-aluminum-bronze . Nickel-aluminum-bronze shall be in accordance with MIL-B-24059. The mechanical properties shall be as speci- fied in “able II. 3.1.9 Plastic (nylon). Plastic (nylon) shall be in acco
30、rdance with MIL-“20693 , composition A, type I. Plastic machine screws shall be as specified on ml8211 and MS18212. 3.2 Protective finish. Unless otherwise specified (see 6.2), screws shall be furnished uncoated with a naturally bright finish, not heat treated. When finishes are specified, they shal
31、l be in accordance with the follow- ing paragraphs. 3.2.1 Carbon steel screws. 3.2.1.1 Cadmium plating. Cadmium plating shall be in accordance with QQ-P-416, Type II, Class 3 or MIL-(2-81562, me II, Class 3. 3.2.1.2 Zinc coating. Zinc coating shall be in accordance with QQ-2-325, Type II, Class 3 or
32、 MIL-C-81562 , me II, Class 3 . 3.2.1.3 Phosphate coating. Phosphate coating shall be in accordance with 1-16232 , Type Z, Class 2. 3.2.1.4 Rnbrittlement relief. Electrodeposited carbon steel screws having a Rockwell Hardness of C40 or higher shall be subjected to an embrittle- ment relief treatment
33、 conducted in accordance with the applicable plating or coating specification. 3.2.2 Corrosion-resisting steel screws. 3.2.2 .l Passivation. with QQ-P-35 Fassivation treatment shall be in accordance 3.2.2.2 Black oxide. Black oxide coating shall be in accordance with MIL-C-13924, Class 4. 3.2.3 Bras
34、s screws. 3.2.3.1 Black chemical. Black chmical finish shall be in accordance with MIL-F-495. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-WB 3.2.4 Aluminum alloy screws 3.2.4.1 Anodizing. Anodizing shall be in accordance with MIL-A-8625, T
35、ype I gr II, Class 1. 3.3 Dimensions. Dimensions and tolerances shall be in accordance with the applicable Military Standard (M) and ANSI B18.6,3. 3.4 Threads. Threads shall be Class 2A, UNC or UNF series, as speci- fied (seemin accordance with Handbook B8. The method of forming shall be at the manu
36、facturers option. 3.5 Workmanshie. Screws shall be free *om fins, burrs, sharp edges, cracks and surface contamination. 4, QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the per- Tomance of
37、 all inspection requirements as specifled herein. Except as otherwise specified in the contract or order, the supplier may use his m or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Govegment. The Government reserves the
38、right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services confowto prescribed requirements. 4.2 m. A lot shall consist of all screws of the same material, type, style, size, thread and protective finish, produce
39、d under the same conditions and offered for acceptance at one time. 4,3 .L Sampling for examination. A random sample of screws shall be selected from each lot in accordance with MlL-S”D-lO5, Inspection Level I. The Acceptable Quality Level (AU) shall be as specified in Table I. 4,3.2 Sampling for te
40、sts. A random sample of screws shall be selected frcm each lot in accordance with MIL-S”D-105, Inspection Level S-1. The AQL shall be 2.5 percent defective. 4.4 Examination, Each screw taken as specified in 4,3 .L shall be examined to verify conformance with this specification. Examination shall be
41、conducted in accordance with lllable I, Any screw in the sample contain- ing one or more defects shall be rejected, and if the number of defective screws in any +ategory exceeds the acceptance number for that category, we lot represented,by .the sample shall be rejected. . 6 Provided by IHSNot for R
42、esaleNo reproduction or networking permitted without license from IHS-,-,-Category FF-S-92B PABU 1. Classification of defects Defect Inspection . Method Critical None defined Major AQL = 2.5 percent defective 101 Size (1.2.2) SIW 102 Length (3.3) SIE 103 Thread (3.4) SIE 104 Slot or recess dimension
43、s (3.3 ) SIE 105 Bearing surface of flat head screws (3.3) SIE Minor A = 4.0 percent defective 2 o1 Magnetic permeability (3.1.2 .l) 202 Other dimensions (3.3) SIE SIE 203 Protective finish missing or incomplete Vi sual 204 Workmanship (3.5 ) Vi sual (3.2) * SIE = Standard Inspection Equipment 4.5 T
44、ests. 4.5.1 Tensile strength. Each screw taken as specified in 4.3.2 shall be tensile strength tested in accordance with Test No. 8 of MIL-STD-1312 to verify conformance with 3.1. 4.5.1.1 Screws too short to be tensile strength test-ed shall be hard- ness tested in accordance with Test No. 6 of MIL-
45、STD-1312. Screws shall meet the minimum hardness requirement of the material from which they were made. 4.5.2 Bending. When ferrous scram are of sufficient length in the unthreaded portion to permit cold bending, each screw taken as specified in 4.32 shall withstand being bent 1800 without fracture,
46、 to a curve having aninner radius equal to the major body diameter of the screw. 4.5.2.1 When the bending test cannot be applied, each test sample shall withstand flattening cold to a thickness equal to one-half of its body diameter, without cracking. 4.6 Protective finish. Examination and test of p
47、rotective finishes shall be in accordance with the applicable specification of 3.2. 4.7 Prqaration for delivery. Examination and test of preparation for delivery shall be in accordance with WP-H-1581, to verify conformance with Section 5. 7 Provided by IHSNot for ResaleNo reproduction or networking
48、permitted without license from IHS-,-,-FF-S-92B 4,8 Chemical analysis. The supplier shall furnish a mill certificate specifying the chemical camposition of the material used in the manufacture of the screws. When specified (see 6.2), chemical analysis shall be in accordance with Method 111.2 or 1E,2
49、 of Fed. Test Method Std. No. 151. In case of dispute, Method 112.2 shall apply. 5. PREPARATION FOR DELIVERY 5,l Packaging and packing. Packaging shall be Level A or C and pack- ing shall be Level A, B or C in accordance with PPP-H-1581, as specified (see 6.2). 5,2 Marking. 5,z.l Civil agencies. In addition to marking required by the contract or order, al1 interior packages and shipping containers shall be marked in a
