1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. MARCH 2009 Page 1 of 4 NAVISTAR, INC. Engineering Standard Parts NUMBER: ESP-CM-28
2、.101-GS TITLE: Hex Socket Head Capscrews General Specifications Metric Series (Noun Code 7450) CURRENT ISSUE DATE: March 2009 WRITTEN/REVIEWED BY: Corporate Technical Standards APPROVED BY: Corporate Technical Standards SUPERSEDES ISSUE OF: May 2007 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED F
3、OR CURRENT REVISION Change Notice: Added specifications for M5 capscrew. International Truck and Engine Corporation replaced by Navistar, Inc. per corporate directive. Added availability of 18-8 stainless steel material (SST-304). GENERAL: The specification contains the essentials of the following s
4、tandards: International Organization for Standardization: ISO 861, 885, 888, 965, and 4762 British Standards Institute: BS 4168 German Institute of Standardization: DIN 912 Standards Association of Australia: AS 1420 The inclusion of dimensional data is not intended to imply that all the capscrews d
5、escribed are stock production sizes. Inch dimensioned standard capscrews may be found ESP-C-28.101-GS. PREFERRED PARTS POLICY: Preferred parts are so designated to reduce variety of parts and assure maximum availability, interchangeability, and cost savings. Material: Class 12.9 Finish: Plain (PLN)
6、Phosphate Coated (PHC) Dimensions in millimeters: Nominal sizes and Length Incrementation: Lengths Nominal Sizes M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 6 x 8 x x 10 x x x x 12 x x x x USE FLANGED 12 POINT SCREWS IN ESP-CM-29.101-GS FOR THESE SIZES 16 x x x x x 20 x x x x x 25 x x x x 30 x x x x 35 x x x
7、 40 x x x 45 x x 50 x x 60 x x 70 x Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-28.101-GS TITLE: Hex Socket Head Capscrews General Specifications CURRENT ISSUE
8、DATE: March 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. MARCH 2009 Page 2 of 4 HEADS: Unless otherwise specified, knurlin
9、g on heads will be optional with the manufacturer providing the diameter across the tops of the knurl and the diameter of the head before knurling or of the unknurled portion are within the tabulated maximum and minimum head diameter limits, respectively. The minimum head diameter will be measured o
10、n the side of the head adjacent to the chamfer or rounding at periphery of bearing face. Top: The top of heads will be flat, perpendicular to the axis of the screw and chamfered or rounded at the periphery and will not exceed the values listed for R1 in the table on the last page of this specificati
11、on. Edge: The edge between the bearing surface and the side of the head may be chamfered or rounded within the tabulated limits of R in the table on the last page of this specification. Concentricity: The head will be concentric with the shank within 1 percent of the basic screw diameter or 0.15 mm
12、full indicator movement (FIM) whichever is greater. SOCKET: Where hexagon sockets are chamfered or relieved, the depth of chamfer or relief will not exceed the equivalent of 7.5 percent of the nominal socket size. The broached sockets which are at or near the maximum limit of size, the overcut resul
13、ting from pre-drilling will not exceed 20 percent of the length of any flat of the socket on sizes up to and including 20 mm. Socket will be concentric with respect to the axis of screw within a tolerance zone having a diameter equal to three percent of the basic screw diameter or 0.13 mm, whichever
14、 is greater, for screws up to and including 12 mm, and of a diameter equal to 6 percent of the basic screw diameter for larger screw sizes. POINT: The point will be flat and either chamfered 45 degrees to a depth slightly below the root of the thread, or a radius approximately equal to 1.4 times the
15、 nominal diameter. Chamfer of screw sizes up to and including 4 mm diameter, and for screw lengths up to 75 percent of the diameter will be optional. POSITION OF HEAD TO SHANK: Positional relationship of head to shank on screws will be such that screws will meet the limits in dimensional chart. LENG
16、TH: The length of capscrews will be measured in a line parallel to the axis of the screw from the bearing surface of the head to the plane of flat of the point. The tolerance on screw length will be as tabulated below. Nominal Length Tolerance Over 6 thru 10 0.29 Over 10 thru 18 0.35 Over 18 thru 30
17、 0.42 Over 30 thru 50 0.5 Over 50 thru 80 0.6 Over 80 thru 120 0.7 Over 120 thru 180 0.8 Over 180 thru 250 0.93 Over 150 thru 300 1.05 THREADS: Thread form, diameters, and associated pitches are in accordance with ISO Standards. Threads will be made to the tolerances for the medium class of fit (6g)
18、 as shown in ISO 965/2 General Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-28.101-GS TITLE: Hex Socket Head Capscrews General Specifications CURRENT ISSUE DATE:
19、 March 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. MARCH 2009 Page 3 of 4 Purpose Metric Screw Threads. Threads with tole
20、rance class 5g6g are an acceptable alternate for class 12.9 as specified in ISO 4762. All sizes and all lengths up to either 10 x the diameter or 150 mm long will be roll threaded. Lengths which exceed 10 x the diameter or 150 mm long may be rolled, cut or ground. THREAD LENGTH: The length of thread
21、 will be the distance from the end of the screw, including any chamfer or radius to the leading face of a screw ring gauge which has been screwed as far as possible onto the screw by hand. See the last page of this document for standard thread lengths. Screws that are too short for minimum thread le
22、ngths as shown on the last page of this document will be threaded to permit a screw ring gage being screwed by hand to within a distance from the underside of the head not exceeding two and one half times the pitch for all diameters. MARKING: At the option of the manufacturer, hexagon socket capscre
23、ws above 5 mm diameter will have the strength grade designation (12.9) permanently marked, preferably by indenting on the side of the head. The manufacturers identification may also be shown. MATERIAL: Class 12.9 (alloy steel). Capscrews will be fabricated from an alloy steel having one or more of t
24、he following alloying elements: chromium nickel, molybdenum, or vanadium, in sufficient quantity to assure that the specified hardness range of Rockwell C 38 to 45 at the surface for sizes up to and including 6 mm, and Rockwell C 37 to 45 for all sizes over 6 mm is met. Screws will be hardened by qu
25、enching from the austenitizing temperature and tempered not lower than 345 C. Stainless Steel, Type 18-8 (SST-304) per CEMS A-37. Stainless steels will be passivated per ESP-A-1.301. DECARBURIZATION: No gross decarburization is permitted on Class 12.9 products. For partial decarburization limits, re
26、fer to dimensional chart. FINISHES: Capscrews will be plain, plated or coated in accordance with the Navistar, Inc. Corporate Engineering Material Specification and class listed below. Zinc Trivalent (ZN6A) CEMS G-20, Class 6A. Phosphate Coating (PHC) CEMS G-1, Class B-2. High tensile strength steel
27、 components such as capscrews, are more susceptible to embrittlement by hydrogen, therefore, electroplating is not recommended for these products. However, if chemical or electrochemical surface coating cannot be avoided, the plated capscrew must be heated at a temperature sufficiently high and for
28、a period sufficiently long to remove the hydrogen RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. Copyright Navistar International Corporation Provided by IHS u
29、nder license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-28.101-GS TITLE: Hex Socket Head Capscrews General Specifications CURRENT ISSUE DATE: March 2009 This document is restricted and may not be sent outside Navistar, Inc. or reprodu
30、ced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. MARCH 2009 Page 4 of 4 SURFACE DISCONTINUITIES: Surface discontinuities will be determined by methods shown in CEMS A-31, Part 1. Dimensions in millimeters: * Non-
31、Preferred Sizes M3 M4 M5* M6 M8 M10* M12* M16* M20* A Body Diameter, Max 3.00 4.00 5.00 6.00 8.00 10.00 12.00 16.00 20.00 Body Diameter, Min 2.86 3.82 4.82 5.82 7.78 9.78 11.73 15.73 19.67 B Body Transition Diameter, Max 3.6 4.7 5.7 6.8 9.2 11.2 14.2 18.2 22.4 C Head Diameter, Max, Plain 5.5 7 8.5 1
32、0 13 16 18 24 30 Head Diameter, Max, Knurled 5.68 7.22 8.72 10.22 13.27 16.27 18.27 24.33 30.33 Head Diameter, Min 5.32 6.78 8.27 9.78 12.73 15.73 17.73 23.67 29.67 D Head Height, Max 3.00 4.00 5.00 6.00 8.00 10.00 12.00 16.00 20.00 Head Height, Min 2.89 3.88 4.86 5.85 7.83 9.81 11.79 15.76 19.73 E
33、Socket Width, Nominal 2.5 3.0 4.0 5.0 6.0 8.0 10.0 14.0 17.0 Socket Width, Min 2.52 3.02 4.02 5.02 6.02 8.03 10.03 14.04 17.05 Socket Width, Max 2.58 3.07 4.07 5.08 6.14 8.18 10.13 14.16 17.23 F Socket Depth, Max 1.7 2.4 3.78 4.78 6.25 7.5 9.7 11.8 Socket Depth, Min-Key Engagement 1.50 2.00 2.50 3.0
34、0 4.00 5.00 6.00 8.00 10.00 COARSE THREAD, 6g G Pitch, Nominal 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2.5 Pitch Diameter, Max 2.655 3.525 5.324 7.16 8.994 10.829 14.663 18.334 Pitch Diameter, Min 2.58 3.433 5.212 7.042 8.862 10.679 14.503 18.164 COARSE THREAD, 5g6g G Pitch, Nominal 0.5 0.7 0.8 1 1.25 1.5 1.7
35、5 2 2.5 Pitch Diameter, Max 2.655 3.525 5.324 7.16 8.994 10.829 14.663 18.334 Pitch Diameter, Min 2.595 3.442 5.234 7.065 8.888 10.711 14.538 18.202 R Radius, Min 0.1 0.2 0.2 0.25 0.4 0.4 0.6 0.6 0.8 R1 Radius or Chamfer, Max 0.3 0.4 0.5 0.6 0.8 1 1.2 1.6 2 H Thread Length, up to 125 mm 12 14 18 22
36、26 30 38 46 Over 125 and Up to 200 mm - - 24 28 32 36 44 52 Over 200 mm - - - - 45 47 57 65 Partial Decarburization Limits 0.2 0.28 0.4 0.51 0.61 0.71 0.81 1.02 Chamfer or Radius, Max 0.13 0.13 0.2 0.2 0.2 0.25 0.25 0.4 K Thread Runout, Max 1.15 1.75 2.5 3.12 3.75 4.38 5 6.25 Eccentricity, Head to Shank, FIM, Max 0.2 0.24 0.24 0.24 0.3 0.3 0.36 0.36 0.42 Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
