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. 2008 by Navistar, Inc. JULY 2008 Page 1 of 6 NAVISTAR, INC. Engineering Standard Parts NUMBER: ESP-CM-29.
2、101-GS TITLE: Flanged 12-Point Screws General Specifications (Noun Code 7450) CURRENT ISSUE DATE: July 2008 WRITTEN/REVIEWED BY: Corporate Technical Standards APPROVED BY: Corporate Technical Standards SUPERSEDES ISSUE OF: November 2003 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT RE
3、VISION Change Notice: International Truck and Engine Corporation changed to Navistar, Inc. per corporate directive. Revised Table 1 with additional dimensions. Added Table 2 defining maximum grip gaging lengths and minimum body lengths. Added text on thread length. Clarified material specifications.
4、 GENERAL: As of this printing, there is no metric International or National standard on this product. The specifications are based upon supplier information and user requirements. The inclusion of dimensional data is not intended to imply that all the screws described are stock production sizes. Inc
5、h dimensioned screws may be found in ESP-C-29.101-GS. PREFERRED PARTS POLICY: Preferred parts are so designated to reduce the variety of parts and to assure maximum availability, interchangeability, and cost savings. Nominal Sizes: M6, M8, M10, M12, M16, M20, and M24 Material & Finish: Class 12.9. P
6、lain (PLN) and Phosphate Coating (PHC) Dimensions in millimeters: Lengths: First Length 12 12 20 25 30 35 Diameter M6 M8 M10 M12 M16 M20 All diameters - 2 mm increments up to 20 mm 5 mm increments over 20 thru 90 mm 10 mm increments over 90 thru 200 mm 20 mm increments over 200 mm TOP OF HEAD: The t
7、op of head may be full form or indented at the option of the manufacturer. If full form, the top of head will be chamfered or rounded with the diameter of chamfer circle or start of rounding being equal to the specified maximum width across flats within a tolerance of -15%. If the top of head is ind
8、ented, the periphery may be rounded. CORNER FILL: The rounding due to lack of fill at all 12 corners of the head will be reasonably uniform. WRENCHING HEIGHT: The wrenching height will be measured, parallel to the axis of screw, from the intersection of the top contour of flange with any corner of h
9、ead to the top of the head. BEARING SURFACE: The bearing surface shall be conical 0.75 0.50 degrees concave from the plane formed by the bearing surface diameter. The plane of the bearing face will be perpendicular to the axis of screw within the runout limit specified in the dimensional chart. Meas
10、urement of runout will be made as close to the periphery of bearing face as possible while the screw is held in a collet or other gripping device at a distance equal to one screw diameter from the underside of the head. Copyright Navistar International Corporation Provided by IHS under license with
11、INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-29.101-GS TITLE: Flanged 12-Point Screws General Specifications CURRENT ISSUE DATE: July 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permissio
12、n from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2008 by Navistar, Inc. JULY 2008 Page 2 of 6 SCREW LENGTH: The nominal length is the distance from the underside of the head to the furthest end of the threaded portion including any chamfer or radius. Toler
13、ances for nominal screw lengths are shown in the following. Dimensions in millimeters: Nominal Length Nominal Size of Screw M5 thru M8 M10 thru M16 M20 To 10 mm, incl 0.3 0.3 Over 10 to 18 mm, incl 0.4 0.4 Over 18 to 30 mm, incl 0.4 0.4 0.6 Over 30 to 50 mm, incl 0.5 0.8 1.3 Over 50 to 80 mm, incl 0
14、.6 1.0 1.5 Over 80 to 120 mm, incl 0.7 1.1 1.7 Over 120 to 180 mm, incl 1.3 1.3 2.0 Over 180 to 240 mm, incl 2.3 2.3 2.3 BODY DIAMETER: On screws threaded full length, the diameter of the screw under the head will not be less than the specified minimum pitch diameter of the thread. THREADS: Thread f
15、orm, diameters, and associated pitches are in accordance with ISO Recommendations for coarse pitch series. Threads will be made to the tolerances of the medium class of fit (6g) for plain or unplated screws as shown in ISO 965/11, General Purpose Metric Screw Threads. THREAD LENGTH: The length of th
16、read on screws shall be controlled by the maximum grip gaging length, Lg, and the minimum body length, Ls, as set forth in the following paragraphs. Grip gaging length, Lg max, is the distance, measured parallel to the axis of the screw, from the plane formed by the bearing circle diameter to the fa
17、ce of a noncounterbored or noncountersunk standard GO thread ring gage assembled by hand as far as the thread will permit. For standard diameter-length combinations of screws, the values for Lg max are specified in Table 2. For diameter-length combinations not listed in Table 2, the maximum grip gag
18、ing length, as calculated and rounded to one decimal place, shall be equal to the nominal screw length, L, minus the basic thread length, M, as specified in Table 1. Body length, Ls min, is the distance, measured parallel to the axis of the screw, from the plane formed by the bearing circle diameter
19、 to the last scratch of thread or the top of the extrusion angle, whichever is closer to the head. For standard diameter-length combinations of screws, the values of Ls min are specified in Table 2. For diameter-length combinations not listed in Table 2, the minimum body length, as calculated and ro
20、unded to one decimal place, shall be equal to the maximum grip gaging length (as computed) minus the maximum transition length as given in Table 1 Lg min = Lg max (X). Ls min shall be used as a criterion for inspection. Nominal thread length, M, as specified in Table 1 is a reference dimension inten
21、ded for calculation purposes only, and is the distance measured parallel to the axis of the screw, from the extreme end of the screw to the last complete (full form) thread. Transition thread length, (X), as specified in Table 1 is a reference dimension intended for calculation purposes only. It inc
22、ludes the length of incomplete threads and tolerances on grip gaging length and body length. The transition from full thread to incomplete thread shall be smooth and uniform. The Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or ne
23、tworking permitted without license from IHS-,-,-NUMBER: ESP-CM-29.101-GS TITLE: Flanged 12-Point Screws General Specifications CURRENT ISSUE DATE: July 2008 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Sup
24、pliers are required to assume all patent liability. 2008 by Navistar, Inc. JULY 2008 Page 3 of 6 major diameter of the incomplete threads shall not exceed the actual major diameter of the complete (full form) threads. The transition threads shall have a rounded root contour no radius of which shall
25、be less than the specified minimum radius at the root of the full form thread. The length of thread will be the distance from the end of the screw, including any chamfer or radius to the leading face of a screw ring gage with no internal chamfer which has been screwed as far as possible onto the scr
26、ew by hand. See table on last page for standard thread lengths. Screws that are too short for minimum thread lengths as shown in table on last page 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 ti
27、mes the pitch. THREAD RUNOUT: Screws will screw at least two pitches into hardened gages such as illustrated below. The diametral clearance will be 0.79 mm for screws up to and including M20 and 1.57 mm for screws larger than M20. A - Thread ring gage set to Class 6H max pitch diameter. B - Sleeve.
28、C - Attachment Screws. D - Max diameter of screw plus diametral clearance. F - Positioning and setting plug for adjusting ring gage to Class 6H diameter and centering sleeve. Thread PD = Class 6H Max. L - Length of screw minus one screw diameter not to exceed 76.2 mm. MARKING: The manufacturers symb
29、ol and property class will be embossed or indented on the top of the head or on the top of the flange. EXAMPLES OF THE MARKING OF SCREWS Property Class Designation Marking of Screws Property Class Designation 12.9 Marking Alternatives 129 MXYZ = Manufacturers Identification (Trade) Marking MATERIAL:
30、 Property Class 12.9 per CEMS A-31, Part I. The steel used will be such that the finished product possesses the mechanical properties listed. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license fr
31、om IHS-,-,-NUMBER: ESP-CM-29.101-GS TITLE: Flanged 12-Point Screws General Specifications CURRENT ISSUE DATE: July 2008 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 pat
32、ent liability. 2008 by Navistar, Inc. JULY 2008 Page 4 of 6 Required Characteristics Class 12.9 Tensile Strength, Min MPa 1220 (psi) 177000 Heat Treatment, Min (Rockwell) C38 Max (Rockwell) C43 FINISHES: Screws will be furnished plain, plated, or coated in accordance with the International Engineeri
33、ng Material Specification and class listed below. Plain (PLN) - Free from dirt and dust and coated with a light oil film. Phosphate Coated (PHC) CEMS G-1, Class B-2. High tensile strength steel components such as flanged 12-point screws, are more susceptible to embrittlement by hydrogen, therefore,
34、electroplating is not recommended for these products. However, if chemical or electrochemical surface coating cannot be avoided, the plated 12-point screws must be heated at a temperature sufficiently high and for a period sufficiently long to remove the hydrogen. WORKMANSHIP: Screws will be free fr
35、om burrs, seams, laps, loose scale, and any defects that affect serviceability. TCopyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-29.101-GS TITLE: Flanged 12-Point S
36、crews General Specifications CURRENT ISSUE DATE: July 2008 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. 2008 by Navistar, Inc. JULY 2008 Page 5 of 6 T
37、able 1: Flanged 12-Point Screws Dimensions in millimeters: Nominal Size M6 M8 M10 M12 M14 M16 M20 A Body Diameter, Max 6 8 10 12 14 16 20 Body Diameter, Min 5.82 7.78 9.78 11.73 13.73 15.73 19.67 B Flange Diameter, Max 9.95 12.95 15.95 17.95 20.95 23.92 29.92 C Width Across Flats, Max 6.05 8.05 10.0
38、5 12.05 14.05 16.05 20.05 Width Across Flats, Min 5.95 7.95 9.93 11.93 13.92 15.92 19.9 D Width Across Corners, Min 6.7 9 11.2 13.5 15.8 18 22.5 E Head Height, Max. 6 8 10 12 14 16 20 Head Height, Min. 5.82 7.78 9.78 11.73 13.73 15.73 19.67 F Wrenching Height, Min 3.12 4.18 5.28 6.33 7.43 8.53 10.67
39、 G Height of Flange, Max. 2.7 3.6 4.5 5.4 6.3 7.2 9 Height of Flange, Min. 2.45 3.35 4.13 5.03 5.93 6.83 8.5 H Chamfer or Radius, Max 0.2 0.2 0.2 0.25 0.25 0.25 0.25 COARSE THREAD R Fillet Radius, Max 0.4 0.6 0.6 1.1 1.1 1.1 1.2 Fillet Radius, Min 0.25 0.4 0.4 0.6 0.6 0.6 0.8 J Pitch, Nominal 1 1.25
40、 1.5 1.75 2 2 2.5 Pitch Diameter, Max 5.324 7.16 8.994 10.829 12.663 14.663 18.334 Pitch Diameter, Min 5.212 7.042 8.862 10.679 12.503 14.503 18.164 M Basic Thread Length, Reference (L Lg) Screw Lengths 125 mm 18.0 22.0 26.0 30.0 34.0 38.0 46.0 Screw Lengths 125 mm and 200 mm 24.0 28.0 32.0 36.0 40.
41、0 44.0 52.0 Screw Lengths 200 mm 37.0 41.0 45.0 49.0 53.0 57.0 65.0 (X) Transition Thread Length, Reference (Lg Ls) 5.0 6.2 7.5 8.8 10.0 10.0 12.5 Drill Size for Shank 6.6 9 11 14 16 18 22 Drill Size for Head 11 14 17 19 22 25 31 Runout of Bearing Surface, FIM, Max 0.18 0.2 0.25 0.33 0.37 0.41 0.51
42、L SL gCopyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: ESP-CM-29.101-GS TITLE: Flanged 12-Point Screws General Specifications CURRENT ISSUE DATE: July 2008 This document is
43、 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. 2008 by Navistar, Inc. JULY 2008 Page 6 of 6 Table 2 - Maximum Grip Gaging Lengths, Lg, and Minimum Body Lengths, Ls, for
44、 Flanged 12-Point Screws Dimensions in millimeters Nom Screw Size M5 x 0.8 M6 x 1 M8 x 1.25 M10 x 1.5 M12 x 1.75 M14 x 2 M16 x 2 M20 x 2.5 L Nom Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min Lg Max Ls Min 8 10 12 14 16 20 25 9.0 5.0 30 9.0 5.0 12.0
45、 7.0 35 19.0 15.0 17.0 12.0 13.0 6.8 40 19.0 15.0 17.0 12.0 13.0 6.8 14.0 6.5 45 29.0 25.0 27.0 22.0 23.0 16.8 19.0 11.5 15.0 6.2 50 29.0 25.0 27.0 22.0 23.0 16.8 19.0 11.5 15.0 6.2 16.0 6.0 (55) 37.0 32.0 33.0 26.8 29.0 21.5 25.0 16.2 21.0 11.0 17.0 7.0 60 37.0 32.0 33.0 26.8 29.0 21.5 25.0 16.2 21
46、.0 11.0 17.0 7.0 (65) 43.0 36.8 39.0 31.5 35.0 26.2 31.0 21.0 27.0 17.0 19.0 6.5 70 43.0 36.8 39.0 31.5 35.0 26.2 31.0 21.0 27.0 17.0 19.0 6.5 (75) 53.0 46.8 49.0 41.5 45.0 36.2 41.0 31.0 37.0 27.0 29.0 16.5 80 53.0 46.8 49.0 41.5 45.0 36.2 41.0 31.0 37.0 27.0 29.0 16.5 (85) 59.0 51.5 55.0 46.2 51.0
47、 41.0 47.0 37.0 39.0 26.5 90 59.0 51.5 55.0 46.2 51.0 41.0 47.0 37.0 39.0 26.5 100 74.0 66.5 70.0 61.2 66.0 56.0 62.0 52.0 54.0 41.5 110 80.0 71.2 76.0 66.0 72.0 62.0 64.0 51.5 120 90.0 81.2 86.0 76.0 82.0 72.0 74.0 61.5 130 90.0 80.0 86.0 76.0 78.0 65.5 140 100.0 90.0 96.0 86.0 88.0 75.5 150 106.0
48、96.0 98.0 85.5 160 116.0 106.0 108.0 95.5 (170) 118.0 105.5 180 128.0 115.5 (190) 138.0 125.5 200 148.0 135.5 220 240 NOTES: 1. Lg is the grip gaging length and Ls is the body length. 2. Diameter-length combinations between the dashed lines are recommended. Lengths in parentheses are not recommended. 3. Screws with lengths above the solid line are threaded full length. 4. For screw lengths longer than the lower dashed lines, Lg and Ls values should be computed. See paragraph on Thread Length. Copyright Navistar International Corporation Provid
