1、 FF-S-85D 10 MARCH 2005 SUPERSEDING FF-S-85C May 6, 1969 FEDERAL SPECIFICATION SCREW, CAP, SLOTTED AND HEXAGON HEAD The General Services Administration has authorized the use of this federal specification by all Federal agencies. 1. SCOPE AND CLASSIFICATION 1.1 Scope. This specification covers the t
2、ypes and styles of slotted and hexagon head cap screws, classified in 1.2.1 (see 6.1). 1.2 Classification. 1.2.1 Types and styles. Cap screws shall be of the following types and styles(see 6.2). Type I - Slotted head. Style 1s - Round head (see fig. 5) Style 2s - Flat countersunk head, 82 (see fig.
3、5). Style 4s - Fillister head (see fig. 5). Type II - Plain head. Style 10p - Hexagon head (see fig. 5). 1.2.2 Grades. Cap screws of steel material shall be of the following grades(see 6.2). Grade 2 - Low carbon steel. Grade 5 - Medium carbon steel. Grade 8 - Alloy steel. Grade 9 - Optional alloy st
4、eel. 1.2.3 Sizes. The sizes of cap screws shall be classified by the nominal body diameter from 1/4 inch thru 3 inches as specified (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 Government Publications. The following documents of the issues in effect on date of invitation for bids, or request for proposal,
5、 form a part of this specification to the extent specified herein. Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center Philadelphia, ATTN: DSCP-ITAA, 700 Robbins Avenue, Philadelphia, PA 19111-5096 or emailed to dscpg Rolled, Drawn, or Cold Finished- UN
6、S A92024 SAE-AMS-QQ-A-225/8 Aluminum Alloy, 6061, Bar, Rod, and Wire, and Special Shapes; Rolled, Drawn, or Cold Finished- UNS A96061 SAE-AMS-QQ-P-35 - Passivation Treatments for Corrosion-Resistant Steel SAE-AMS-QQ-P-416 - Plating, Cadmium (Electrodeposited) SAE J429 - Mechanical and Material Requi
7、rements for Externally Threaded Fasteners (Application for copies should be addressed to the SAE International, 400 Commonwealth Drive , Warrendale, PA 15096-0001.) American Society for Testing and Materials (ASTM) ASTM A342 - Standard Test Methods for Permeability of Feebly Magnetic Materials ASTM
8、B21 - Standard Specification for Naval Brass Rod, Bar, and Shapes ASTM B98 - Standard Specification for Copper-Silicon Alloy Rod, Bar, and Shapes ASTM B124 - Standard Specification for Copper and Copper Alloy Forging Rod, Bars and Shapes ASTM B138 - Standard Specification for Manganese Bronze Rod, B
9、ar, and Shapes Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-85D 4ASTM B139 - Standard Specification for Phosphor Bronze Rod, Bar, and Shapes ASTM B150 - Standard Specification for Aluminum Bronze Rod, Bar, and Shapes ASTM B154 - Standard Test
10、 Method for Mercurous Nitrate Test for Copper and Copper Alloys ASTM B633 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel ASTM D3951 Standard Practice Commercial Packing ASTM E10 - Standard Test Method for Brinell Hardness of Metallic Materials - AASHTO NO. T70-86 AS
11、TM E18 - Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials ASTM E1282 Standard Guide for Specifying the Chemical Compositions and Selecting Sampling Practices and Quantitative Analysis Methods for Metals, Ores, and Related Materials ASTM E1417 Standa
12、rd Practice for Liquid Penetrant Examination ASTM E1444 - Standard Practice for Magnetic Particle Examination ASTM F468 Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use ASTM F606 - Standard Test Methods for Determining the Mechanical Properties of Externally and
13、 Internally Threaded Fasteners, Washers and Rivets (Application for copies should be addressed to the ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) American Society for Quality Control (ASQ) ASQ Z1.4 Sampling Procedures and Tables for Inspection by Attributes (Application for copie
14、s should be addressed to the American Society for Quality Control, 611 East Wisconsin Avenue, Milwaukee, WI 53202.) National Aerospace Standards Committee (NASC) NASM 1312-6 - Fastener Test Methods - Method 6, Hardness NASM35307 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel Corrosion Res
15、isting, Passivated, UNC-2A NASM35308 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel Corrosion Resisting, Passivated, UNF-2A NASM51095 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Head Drilled for Locking Wire, Steel, Grade 5, Cadmium Plated, UNC-2A, Plain and Self-locking NASM51096
16、 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Head Drilled for Locking Wire, Steel, Grade 5, Cadmium Plated, UNF-2A, Plain and Self-locking NASM51105 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Shank Drilled for Cotter Pin, Steel, Grade 5, Cadmium Plated, UNC-2A NASM51106 - Screw, Cap
17、, Hexagon Head (Finished Hexagon Bolt), Shank Drilled for Cotter Pin, Steel, Grade 5, Cadmium Plated, UNF-2A NASM51109 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Shank Drilled for Cotter Pin, Steel, Corrosion Resisting, Passivated, UNC-2A Provided by IHSNot for ResaleNo reproduction or netw
18、orking permitted without license from IHS-,-,-FF-S-85D 5NASM51110 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Shank Drilled for Cotter Pin, Steel, Corrosion Resisting Passivated, UNF-2A NASM90725 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel, Grade 5, Cadmium Plated, UNC-2A NASM9
19、0726 - Screw, Cap, Hexagon Head (Finished Hexagon Bolt), Steel, Grade 5, Cadmium Plated, UNF-2A (Application for copies of NASC publications should be addressed to the Aerospace Industries Association, 1250 Eye Street, NW, Washington, DC 20005.) 3. REQUIREMENTS 3.1 Material. Unless otherwise specifi
20、ed in the invitation for bids, contract or order, cap screws shall be made of materials specified in 3.1.1 through 3.1.5 and Table IA (see 6.2). 3.1.1 Low carbon steel. Unless otherwise specified (see 6.2) grade 2 cap screws shall be made of low carbon steel as shown in Table I. The chemical composi
21、tion shall contain a maximum of 0.28 percent carbon, a maximum of 0.04 percent phosphorus, and a maximum of 0.05 percent sulfur. 3.1.2 Medium carbon steel. Grade 5 cap screws shall be made of medium carbon steel as shown in Table I and conforming to the requirements of SAE-AMS-STD-66. The chemical c
22、omposition shall contain 0.28 to 0.55 percent carbon, a maximum of 0.04 percent phosphorus and a maximum of 0.05 percent sulfur. It shall be quenched and tempered at a minimum temperature of 800F. Cap screws of the following standards shall be made in accordance with the specification: MS35295, NASM
23、51095, NASM51096, NASM51105, NASM51106, NASM90725, and NASM90726. 3.1.3 Alloy steels. 3.1.3.1 Alloy steel, Grade 8. Grade 8 cap screws shall be made of alloy steel as shown in Table I and conforming to the requirements of SAE-AMS-STD-66. The chemical composition shall contain 0.28 to 0.55 percent ca
24、rbon, a maximum of 0.04 percent phosphorus, and a maximum of 0.05 percent sulfur. It shall be hardened sufficiently to a minimum oil-quench Rockwell hardness of C45 at the center of the threaded section, one diameter from the end of the cap screw. Cap screws of the following standards shall be made
25、in accordance with the specification: MS35302, MS51107, and MS51108. TABLE I. Grades and Mechanical Properties of Steel Cap Screws 1/4 thru 3 Inch Diameters Hardness Grade Designation Nominal Size Dia., Inch Proof Load p.s.i. Tensile Strength p.s.i. (Min)Brinell No. Rockwell Min Max Min Max 2 1/4 th
26、ru 3/4 * 55,000 74,000 149 241 B80 B100 Over 3/4 thru 1-1/2* 33,000 60,000 121 241 B70 B100 1/4 thru 1 85,000 120,000 255 321 C25 C34 5 Over 1 thru 1-1/2 74,000 105,000 223 285 C19 C30 Over 1-1/2 thru 3 55,000 90,000 183 235 B90 C21.7 8 1/4 thru 1-1/2 120,000 150,000 302 352 C33 C39 Over 1-1/2 thru
27、3 85,000 120,000 302 352 C33 C39 9 (Option Alloy) 1/4 thru 1-1/2 130,000 170,000 336 386 C36 C45 * 6“ and less in length. * All diameters if length exceeds 6“. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-85D 63.1.3.2 Optional alloy steel. Th
28、e optional alloy steel shown in Table I shall have the same chemical composition as grade 8 conforming to the requirements of SAE-AMS-STD-66 except that it shall be hardened sufficiently to a minimum oil quench Rockwell hardness of C50 at the center of the threaded section, one diameter from the end
29、 of the cap screw. 3.1.3.3 Alloy steels. Alloy steels shall be oil-quenched and tempered at a minimum temperature of 800F. 3.1.4 Corrosion resisting steels. 3.1.4.1 Austenitic. Austenitic corrosion resisting steel screws shall be manufactured from 300 series corrosion steel as specified in SAE-AMS-S
30、TD-66 and meet the mechanical properties specified in 3.2.2.1. Cap screws of NASM35307 and NASM35308 shall be made in accordance with the specification. 3.1.4.2 Ferritic and martensitic. Ferritic and martensitic corrosion resisting steel cap screws shall be manufactured from a steel composition such
31、 as steel numbers 410, 416, and 430 as specified in SAE-AMS-STD-66 and meets the mechanical properties specified in 3.2.2.2. Cap screws of NASM51099, NASM51100, NASM51109, and NASM51110 shall be made in accordance with the specification. 3.1.5 Non-ferrous material. Non-ferrous cap screws shall be ma
32、nufactured from alloys specified in Table IA (see 6.2). Cap screws of MS35309, MS35310, MS35311, and MS35312 shall be made in accordance with the specification. 3.1.5.1 Stress relief. Cold worked naval brass screws shall be stress relieved by heating the screws to a temperature of 600F, and holding
33、at that temperature for a minimum of one hour. 3.1.6 Self-locking element. Non-metallic, self-locking elements shall be in accordance with MIL-DTL-18240. 3.2 Mechanical properties. 3.2.1 Steel. Grades and mechanical properties of low carbon, medium carbon, alloy steel, and optional alloy steel cap s
34、crews shall conform to Table I, as applicable (see 6.2). 3.2.2 Corrosion resisting steel. 3.2.2.1 Austenitic. Unless otherwise specified in the invitation for bids, contract or order, mechanical properties of austenitic corrosion-resisting steel cap screws shall conform to the following for diameter
35、s through 5/8 inch: a. Ultimate tensile strength 80,000 p.s.i. min. b. Yield strength (0.2 percent offset) 30,000 p.s.i. min. c. Rockwell Hardness B80 min. d. Elongation 30 percent min. e. Reduction in area 40 percent min. For diameters over 5/8 inch, ultimate tensile strength shall be 70,000 p.s.i.
36、 min. and have a hardness of Rockwell B74 min. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FF-S-85D 73.2.2.2 Ferritic and martensitic. Unless otherwise specified in the invitation for bids, contract or order, mechanical properties of ferritic and
37、 martensitic corrosion-resisting steel cap screws shall conform to the following: a. Ultimate tensile strength 70,000 p.s.i. min. b. Yield strength (0.2% offset) 40,000 p.s.i. min. c. Brinell hardness B235 max d. Elongation 15 e. Reduction in area 45 3.2.3 Non-ferrous cap screws. Unless otherwise sp
38、ecified in the invitation for bids, contract or order, mechanical properties of non-ferrous cap screws shall conform to Table IA, as specified (see 6.2). TABLE IA. Mechanical Properties of Screws of the Non-Ferrous Materials. Material Applicable specifica-tions UNS No. or Class Temper code or Condit
39、ion Tensile strength p.s.i. minimum Yield strength at 0.2 percent offset or at extension indicated Elongation minimum minimum p.s.i extensionunder load Manganese bronze ASTM B138 C67500 O60 55,000 22,000 0.5 percent 20 Aluminum bronze ASTM B150 C63200 TQ55 O20 O25 90,000 37,000 0.5 percent 18 Phosph
40、or bronze ASTM B139 C51000 H04 60,000 33,000 - 15 Silicon bronze ASTM F468 C65100 - 60,000 40,000 0.5 percent 10 Naval brass ASTM B21 C46200 or C46400 H04 or O50 60,000 27,000 0.5 percent 25 2/ Aluminum alloy 2024 SAE-AMS-QQ-A-225/6 - Solution heat-treated temper T4 62,000 40,000 0.0058 inch per inc
41、h 10 3/ Aluminum alloy 6061 SAE-AMS-QQ-A-225/8 - Age hardened temper T6 42,000 35,000 0.0055 inch per inch 10 3/ Nickel-copper alloy QQ-N-281 Class A 80,000 40, 000 0.0071 inch in 2 inches 20 1/ Nickel- copper- aluminum alloy QQ-N-286 Class A Form 1 130,000 90,000 0.0109 inch in 2 inches 20 1/ 1/ In
42、 2 inches (min) 2/ In 4 times diameter or thickness (min) 3/ In 2 inches or 4 times diameter (min) 3.3 Dimensions and tolerances. Cap screws shall conform to the dimensions and tolerances of ASME B18.2.1 and B18.6.2 except as specified herein. 3.3.1 Lengths. Unless otherwise specified (see 6.2), cap
43、 screws shall be furnished in the following length increments: Lengths up to 1/2 inch incl - 1/16 inch increments. over 1/2 to 1 inches incl - 1/8 inch increments. over 1 to 5 inches incl - 1/4 inch increments. over 5 inches - 1/2 inch increments. Provided by IHSNot for ResaleNo reproduction or netw
44、orking permitted without license from IHS-,-,-FF-S-85D 83.3.2 Thread series, class, lengths, and hand. Unless otherwise specified (see 6.2), cap screws shall be right - hand of the UNC (coarse thread) or UNF (fine thread) series, Class 2A, in accordance with FED-STD-H28/2. 3.3.3 Threads protectively
45、 coated. Unless otherwise specified (see 6.2), threads protectively coated shall meet the dimensions of FED-STD-H28/2 after the coating has been applied. 3.3.4 Bearing surface. Bearing surface of cap screw heads, except flat head, shall be at right angles to the axis of the body within a tolerance o
46、f 2 degrees and of hex head within a tolerance of 2 degrees for 1 inch size and smaller, and 1 degree for sizes larger than 1 inch. The axis of the head shall be concentric with the axis of the body (determined by one diameter length of body under head) within a tolerance equal to 3 percent (6 perce
47、nt TIR) of maximum width across flats. Any mutilation of the bearing surface sufficient to prevent proper seating of the screw shall be cause for rejection. 3.4 Protective coatings. 3.4.1 Coatings. Cap screws shall be furnished uncoated, passivated, or coated as specified herein (see 6.2). 3.4.2 Pas
48、sivation. Corrosion resistant steel cap screws shall be passivated in accordance with SAE-AMS-QQ-P-35. 3.4.3 Cadmium plating. When specified (see 6.2), cap screws shall be cadmium plated in accordance with SAE-AMS-QQ-P-416, Type II, Class 2. 3.4.4 Zinc plating. When specified (see 6.2), cap screws s
49、hall be zinc plated as specified in ASTM B633, type II, class FE/ZN 5. 3.4.5 Anodizing. Unless otherwise specified, aluminum alloy cap screws shall be electrolytically treated in conformance to MIL-A-8625, type II, class 1, non-dyed (see 6.2). 3.4.6 Phosphate. When specified (see 6.2), cap screws shall be treated in conformance to MIL-DTL-16232, type Z, class 2. 3.4.7 Black chemical. W
