1、AMERICAN STANDARD Miniature Screws ASA 618.11-1961 REAFFIRMED 2000 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS1 1 Society of Automotive Engineers The American Society of Mechanical Engineers THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New
2、 York, N. Y. 1001 7 ANSI 818.11-1961 7 April 1971 ACCEPTANCE NOTICE The following Industry Standardization Document was adopted on 7 April 1971 for mandatory use by the Department of Defense. The indicated industry group has furnished the clearances required by existing regula- tions. Copies of this
3、 document are stocked by the DOD Single Stock Point, Naval Publications and Forms Cen- ter, Philadelphia, Pennsylvania 19120, for issue to Military Activities and Federal Agencies only. Title of Document: Miniature Screws Document No.: ANSI B18.11-1961 Date of Adopted Issue: 1961 Releasing Industry
4、Group: The American Society of Mechanital Engineers Custodians: Army - WC Navy - SH Air Force - 82 Reviewer Activities: Army - AT. AV. MU Navy - None Air Force - None Military Coordinating Activity: Army - WC Roiect No. 5305-1 097 I FSC 5305 I No part of this document may be reproduced in any form,
5、in an electronic retrieval system or otherwise, without the prior written permission of the publisher. THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Copyright 1961, by Reprinted March 1972 Printed in U.S.A. Foreword M INIATURE screws, as covered by this standard, are those having threads of a nominal
6、 diam- eter from 0.0118 inch (0.3 mm) to 0.0551 inch (1.4 mm). Demand for screws and threads of such sizes has extended in recent years from the needs of the watch industry to subminiaturiza- tion requirements of control mechanisms, instruments, and other devices. This led to the develop-, ment of U
7、nified Miniature Screw Threads, ASA B1.lO-1958. This is the complement to the screw thread standard to provide a recommended series of miniapre screws and nuts. Subcommittee 13 of Sectional Committee B18 first undertook development of a product standard for miniature screws which was submitted to le
8、tter ballot of the Sectional Committee February 9, 1960. Final approval as an American Standard was given on February 20, 1961. Standards for nuts are in process of development. Officers of Sectional Committee H. W. Robb, Cbairmata, Engineering Services, General Electric Co., 1 River Road, F. V. Kup
9、chak, Vice Chairman, Westinghouse Electric Corp., Standards Department 2-F, R. B. Belford, Seaetary, Technical Advisor, Industrial Fasteners Institute, 1517 Terminal Tower, personnel of Subcommittee No. 13 on Miniature Screws Schenectady 5, New York East Pittsburgh, Penna. Cleveland 13, Ohio M. A. S
10、chultheis, Chairman, Staff Engineer, Engineering Standards, Building 6, Mail Station T2057, J. C. Burgbacher, Watch Engineer, Bdova Watch Company, Inc., Bulova Park, Flushing 70, N. Y. J. B. Dirlam, J. I. Morris Company, 394 Elm Street, Southbridge, Mass. E. 0. Drescher, Bulova Watch Company, Inc.,
11、75-20 Astoria Blvd., Flushing 70, N. Y. F. L. Calkins, Liaison, Wright Air Development Div., Standardization Section, Attn: WWDXSS, I. H. Fullmer, Chief, Engineering Metrology Section, National Bureau of Standards, Washington 25, D. C. M. C. Kunt, Weston Electrical Instrument Corp., 614 Freylinghuys
12、en Avenue, Newark, N. J. F. V. Kupchak, Westinghouse Electric Corp., Standards Department 2-F, East Pittsburgh, Pa. Vincent Meigs, Autonetics, A Division of North American Aviation, Inc., 9150 E. Imperial Highway, R. L. Rufsuyder, Senior Design Engineer, Oldsmobile Motor Div., General Motors Cop., a
13、ning, Mich. E. H. Schaeffer, Chief Manufacturing Engineer, Elgin National Watch co., Elgin, Illinois c. E. Smart, Works Manager,.W. & L. E. Gurley, 514 Fulton Street, Troy, N. Y. R. B. Tackaberry, Development Physicist, American Optical Co., Instrument Division, Buffalo 15, N. y. F. P. Tisch, Chief
14、Metrologist, Voi-Shan Mfg. Company, A Division of Voi-Shan Industries, Inc., Hughes Aircraft Co., Culver City, Calif. Wright-Patterson AFB, Ohio Downey, Calif. 8463 Higuera St., Culver City, Calif. K. T. Vande, Chief Draftsman, Bausch & Lomb 0ptic.d Co., 635 St. Paul St., Rochester, N. Y. D. F. Vile
15、s, President, Waltham Screw Company, Waltham 54, Mass. Jack Watson, Supervisor Engineering Standards, Radioplane, A Dip. of Northrup Corp., 8000 Woodley Ave., P. F. Weber, Assistant Works Mgr., Kollsman Instrument Cotp., 80-08 45th Ave., Elmhurst 73, N. Y. D. Whiteman, Works Manager, Anti-Corrosive
16、Metd Products Co., Inc., Castleton-on-Hudson, N. Y. Van Nuys, Calif. AMERICAN STANDARD Slotted Head Miniature Screws INTRODUCTION 1. Scope. This standard establishes head types, their dimensions, and lengths of slotted head miniature screws, threaded in conformance with American Standard Unified Min
17、iature Screw Threads, ASA BI.lO. This standard is predicated upon information derived through research of the maximum using industries. The inclusion of four head types and the given thread sizes in the data tables is not in- tended to imply that all of those described in this standard are stock pro
18、duction items. Preferred diameter pitch combinations for general use are shown in bold type in the tables. Consumer inter ests are requested to consult manufacturerscata- logs for lists of current stock production minia- ture screws. HEAD TYPES 2. Fillister Head. The fillister head has a flat top su
19、rface (oval crown optional), cylindrical sides, and a flat bearing surface. Head propot- tions are given in Table 1. 3. Pan Head. The pan head has a flat top sur- face, cylindrical sides, and a flat bearing surface. The head height is less than the fillister but the head diameter is slightly larger.
20、 Head proportions are given in Table 2. 4. Flat Head. The flat head has a flat top sur- face and a conical bearing surface with an in- cluded angle of approximately 100. Head pro- portions are given in Table 3. 5. Binding Head. The head height is less than the pan head but the head diameter is great
21、er, and is intended for applications which would otherwise require washers. Head proportions are given in Table 4. SPECIFICATIONS 6. Head Height. The head heights given in the dimensional tables represent the metal measure- Tent (after slotting). 7. Depth of slots. The depth of slots on fillis- ter,
22、 pan and binding head screws is measured from the bearing surface to the intersection of the bottom of the slot with the head diameter. On heads with a conical bearing surface, the depth of slots is measured parallel to the axis of the screw from the flat top surface to the intersection of the botto
23、m of the slot with the bearing surface. The maximum permissible concavity of the slot shall not exceed 3 per cent of the mean head diameter. 8. Bearing surface. The bearing surface of fil- lister, pan and binding head screws shall be at right angles to the axis of the body within 2. 9. Eccentricity.
24、 Eccentricity is defined as one- half of the total indicator reading. 9(a). Head Eccentricity. The heads of minia- ture fastening screws shall not be eccentric with the screw bodies by more than 2 per cent of the maximum head diameter or 0.001, whichever is the greater. 9(b). Eccentricity of Slots.
25、Slots in miniature fastening screw heads shall not be eccentric with screw bodies by more than 5 per cent of the nominal body diameter. 10. Underhead Fillets. The radius of the fillet under perpendicular bearing surface type heads shall not exceed 1/2 times the pitch of the thread. The radius of the
26、 fillet under conical bearing surface type heads shall not exceed 2 times the pitch of the thread. The radius of the fillet under the binding head is given in Table 4. 11. Unthreaded Diameter. On miniature fasten- ing screws not threaded to the head, the diam- eter of the unthreaded body shall not b
27、e more than the maximum major diameter of the thread nor less than the minimum pitch diameter of the thread. 12. Length. The length of miniature screws hav- ing perpendicular bearing surface type heads shall be measured from the bearing surface to the ex- treme end in a line parallel to the axis of
28、the screw. The length of screws with conical bear- ing surface type heads shall be measured from the top of the head to the extreme end in a line parallel to the axis of the screw. Preferred lengths are those listed in Table 5. 4 SLOTTED HEAD MINIATURE SCREWS 13. Tolerance on Length. The length tole
29、rance of miniature screws shall conform to the limits given in Tabie 5. 14. Length of Thread. On all miniature screws having a length four times the nominal body diameter or less the threaded length shall extend to within tm threads of the bearing surface of the head. Screws of greater length shall
30、possess complete threads for a minimum of four diameters. 15. End of Body. Miniature fastening screws shall be regularly supplied with flat ends having a chamfer of approximately 45O extending to the minor diameter of the thread as a minimum depth. 16. Thread Series and Tolerances. The screw threads
31、 of miniature screws shall be in con- formance with American Standard Unified Minia- ture Screw Threads, ASA B 1.10-1958. 17. Material and Finish. Miniature screws are generally supplied in ferrous and nonferrous ma- terials, coatings and heat treatments which must be specified by the user. Coatings
32、, when re- quired, are Iimited to those of electro-plating OK chemical oxidation. 18. Designation. Screws in conformance with this standard shall be identified by the designa- tion for thread size in conformance with Ameri- can Standard ASA B 1.10 followed by the nominal length in units of 1/1000 in
33、ch (omitting the dec- imal point) and the head type. Typical examples are: 60 UNM X 040 FIL HD 100 UNM x 080 PAN HD 120 UNM x 120 FLAT HD 140 UNM X 250 BIND HD 19. Machined Finish. Roughness of the machined surfacesofheadsshallnotexceed63micro-inches arithmetical average (per ASA B46.1, Surface Text
34、ure) determined by visual comparison with roughness comparison specimens. 5 Sire Desig- nation (a) 30 UNM 35 UNM 40 UNM 45 UNM 50 UNM 55 UNM 60 UNM 70 UNM 80 UNM 90 UNM 100 UNM 110 UNM 120 UNM 140 UNM AMERICAN STANDARD UNM THREAD OVAL CROWN OPTIONAL MIN RADIUS 0.85 OF NOM HEAD DIA 1 D Thds I Basic M
35、ax 318 0.0472 102 0.0433 102 0.0394 102 0.0354 113 0.0315 127 0.0276 145 0.0236 169 0.0217 203 0.0197 203 0.0177 254 0.0157 254 0.0138 282 0.0118 85 0.0551 Table 1 - Fill ister Head Fillistet Head Dimensions A Head Dia 1 Max 0.021 0.023 0.025 0.0 27 0.033 0.037 0.041 0.045 0.05 1 0.056 0.062 0.072 0
36、.082 0.092 - Min 0.019 0.021 0.023 0.027 0.031 0.035 0.039 0.043 0.049 0.054 0.058 0.068 0.070 0.088 - - H Head Hgt I Max 0.012 0.0 14 0.016 0.018 0.020 0.022 0.025 0.028 0.032 0.036 0.040 0.045 0.050 0.055 Min 0.010 0.012 0.013 0.015 0.017 0.0 19 0.021 0.024 0.028 0.032 0.035 0.040 0.045 0.050 J Sl
37、ot Width T Max 0.004 0.004 0.005 0.005 0.006 0.006 0.008 0.008 0.010 0.0 10 0.012 0.012 0.016 0.0 16 Min 0.003 0.003 0.003 0.003 0.004 0.004 0.005 0.005 0.007 0.007 0.008 0.008 0.012 0.012 Max 0.006 0.007 0.008 0.009 0.010 0.01 1 0.012 0.014 0.016 0.0 18 0.020 0.022 0.025 0.028 T 0.004 0.002 0.005 0
38、.002 0.002 0.006 0.000 0.023 0.006 0.000 0.020 0.005 0.006 0.018 0.005 0.006 0.016 0.004 0.005 0.014 0.004 0.005 0.012 0.003 0.004 0.011 0.003 0.004 0.009 0.002 0.003 0.008 0.002 0.003 0.007 0.002 0.002 0.007 0.002 0.002 0.006 0.002 (a) Bold face type indicates preferred size (b) “T“ measured from b
39、earing surface (c) Relative to max. major dia. MATERIAL: MACHINE FINISH: APPLIED COATINGS NOTE: CORROSION RESISTANT STEELS ASTM Designation A276 CLASS 303, COND A CLASS 416, COND A, HEAT TREAT TO APPROX 120,000-150.000 PSI (ROCKWELL C28-34) CLASS 420, COND A, HEAT TREAT TO APPROX 220,000-240,000PSI
40、(ROCKWELL C50-53) BRASS: TEMPER HALF HARD ASTM Designation B16 NICKEL SILVER TEMPER HARD ASTM Designation B151, Alloy C Machined surface roughness of heads shall be approximately 63MU in. arithmetical average determined by visual comparison. CORROSION RESISTANT STEEL: Passivate BRASS: Bare, Black Ox
41、ide or Nickel Flash. NICKEL SILVER: None 1. The diameter of the unrhreaded body shall not be more than the maximum major diameter nor less than the minimum pitch diameter of the thread. 2. For screw lengths four times the major diameter or less, thread lengch(Lc) shall extend to within two threads o
42、f the head bearing surface. Screws of greater length shall have complete threads for a minimum of four major diameters. 3. Screws shall be free of all projecting burrs, observed at 3X magnification. 4. All dimensions are in inches. 6 SLOTTED HEAD MINIATURE SCREWS Siz e Desig- nation (a) 30 UNM 35 LN
43、M 40 UNM 45 UNM 50 UNM 55 UNM 60 UNM 70 UNM 80 UNM 90 UNM 100 UNM 110 UNM 120 UNM 140 UNM Thd s Per Inch 318 282 254 254 203 2 03 169 145 127 113 102 102 102 85 T I L J+ T- IL 45y:p Table 2 - Pan Head - UNM ASA E f R 51 1 HR .to !E AD ro h All NOR DIA MIN 0.0138 0.039 0.041 0.0197 0.035 0.037 0.0177
44、 0.031 0.033 0.0157 0.027 0.029 Pan Head Dimensions 3 Head Hgt Max Min 0.010 0.008 0.011 0.009 0.012 0.010 0.014 0.012 0.016 0.028 0.021 0.025 0.019 0.022 0.017 0.020 0.015 0.018 0.013 0.040 0.045 0.035 0.040 0.032 0.036 0.028 0.032 0.024 J Slot Width Max 0.005 0.006 0.006 0.007 0.008 0.009 0.010 0.
45、011 0.012 0.014 0.018 0.018 0.020 0.022 - Min 0.003 0.004 0.004 0.005 0.006 0.007 0.007 0.008 0.009 0.011 0.014 0.014 0.016 0.018 - _ C Chamfer Max 0.002 0.002 0.002 0.002 0.003 0.003 0.004 0.004 0.005 0.005 0.006 0.006 0.008 0.008 R (c) Radius Max 0.002 0.002 0.002 0.002 0.002 0.0 02 0.003 0.003 0.
46、004 0.004 0.005 0.005 0.006 0.006 (e) Bold face type indicates preferred size (b) “T” measured from bearing surface (c) Relative to mal. major dia MATERIAL: CORROSION RESISTANT STEELS ASTM Designation A276 CLASS 303, COND A CLASS 416, COND A, HEAT TREAT TO APPROX 120,000-150,000 PSI (ROCKWELL C28-34
47、) CLASS 420, COND A, HEAT TREAT TO APPROX 220,000-240,000 PSI (ROCKWELL C50-53) BRASS: TEMPER HALF HARD ASTM Designation B16 NICKEL SILVER: TEMPER HARD ASTM DesiRnation R151, Alloy C MACHINE Machined surface roughness of heads shall be approximately 63MU in. arithmetical average FINISH: determlned b
48、y visual comparison. APPLIED CORROSION, RESISTANT STEEL: Passivate. COATINGS: BRASS: Rare, Black Oxide or Nickel Flash. NICKEL SILVER: None NOTE: 1. The diameter of the unthreaded body shall not be more than the maximum major diameter nor less than the minimum pitch diameter of the thread. in two th
49、reads of the head bearing surface. Screws of greatex length shall have complete threads for a minimum of four major diameters. 2. For screw lengths four times the major diameter or less, thread length (LC) shall extend to with- 3. Screws shall be free of all projecting burrs, observed at 3X magnification. 4. All dimensions are in inches. 7 AMERICAN STANDARD Bl.10 THREAD P I MIN Y4TL Table 3 - 100-Dog Flat Head Ba?ic Major Dia Head Dia Head Dimc H sions r T Thds lnch per T T Av (b) Dia of Full Cone At Max H 0.0285 0.0305 0.0348 0.0392 0.0459 0.0503 0.0546 0.0610 0.0696 0.0759 0.0847 0
