1、NASM 33537-2002 螺纹护套安装规范_Aerospace NATIONAL AEROSPACE STANDARD Industries Association 0 COPYRIGHT 2Mn AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED PROCUREMENT SPECIFICATION NONE FED SUP CLASS 5340 CLASSIFICATION PART STANDARD SHEET 1 OF 13 TITLE INSERT, SCREW THREAD, HELICAL
2、 COIL, INCH SERIES, COARSE AND FINE THREAD, STANDARD ASSEMBLY DIMENSIONS FOR 1. 2. 3. 4. 4. GENERAL INSTRUCTIONS DESCRIPTION: Helical coil inserts are screw thread bushings coiled from diamond shaped cross-section wire. They are screwed into tapped holes to form nominal size internal threads. Insert
3、s are installed by torquing through a diametral tang which is notched for tang removal. MATERIAL: As specified on the drawing. THREADS: Assembled inserts, Classes 28 and 38, are controlled by the tolerance range of the tapped hole into which insert is fitted. Due to the radius on the crest of the in
4、sert at the minor diameter, the assembled insert will accept external threaded parts which are threaded to MIL-S-8879. The grip coil or coils of the screw locking insert are shaped to provide a prevailing torque when the screw is installed in the assembled insert. TAPPED HOLE: 60 Unified Internal th
5、read form with the minimum major diameter based on a truncation to 0.125. Desiqnation for tapped hole: The drawing note for the tapped hole, per table IV, that will accept the helical coil insert shall be in accordance with the following examples: EXAMPLE 1 .3125-24 UNF-3B HELICAL COIL INSERT THD PE
6、R MS33537 .67 MIN FULL THD DEPTH .3125-24 UNF-38 HELICAL COIL INSERT THD THRU PER MS33537 BELOW S URFAC E REMOVE TANG INSTALL INSEET .75-1.5 TURNS For Blind Hole (Based on 2 Diameter Engagement) (Minor Diameter Drill Depth Tolerance approx. .O60 or as otherwise appropriate) For thru hole with Insert
7、 being Assembled (Based on 2 Diameter En gag em e nt) LIST OF CURRENT SHEETS THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MS33537. REVISION E. AMENDMENT 1. PART NUMBERS REMAIN MS33537 THIRD ANGLE PROJECTION -.-a- I CUSTODIAN NATIONAL AEROSPACE STANDARDS COMMITTEE USE OF OR RELIANCE UPON THIS DOCU
8、MENT OR ANY NATIONAL AEROSPACE STANDARD IS ENT.RELY VOLUNTARY AIA DOES NOT OUALIN SUPPLIERS OR CERTIF CONFORMANCE OF ITEMS PROCLRED UhDER hATIONAL AEROSPACE STANDARCS AIA MAGS NO REPRESENTATION OR CLAIM RESPECTING i1 i THE _ _ SITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION. OR (2) THE WSTENCE OF
9、 OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS: Copyright Aerospace Industries Association of America Inc. Provided by IHS under license with AIA/NASNot for ResaleNo reproduction or networking permitted without license from IHS-,-Aerospace NATIONAL AEROSPACE STANDARD Industries Association
10、O COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED EXAMPLE 2 MINOR DIA .3215-.3288 x .791-.851 DEEP .36-.39 DIA x 1 15-125 CSK .3125-24 UNF-3B HELICAL COIL INSERT .67 MIN FULL THD DEPTH MINOR DIA .3215-.3288 THRU .36-.39 DIA x 11 5-125 CSK .3125-24 UNF3B HELICAL C
11、OIL INSERT PITCH DIA .3395-.3421 THD PER MS33537 FOR THD THRU PER MS33537 FOR PITCH DIA .3395-.3421 MAJOR DIA .3666 MIN BELOW SURFACE TANGLESS INSERTS) MAJOR DIA .3666 MIN INSTALL INSERT .75-1.5 TURNS REMOVE TANG - (NOT REQUIRED WITH 5. 6. 6.1 6.2 6.3 6.3.1 6.3.2 6.3.3 REDUCED FIRST COIL: The first
12、coil of the free insert adjacent to the tang has been reduced in diameter on the larger inserts to facilitate starting the insert into the tapped hole. DI MENS IO NAL DATA: For free running and screw locking inserts having a nominal length of 1, 1.5, 2,2.5, and 3 times the nominal major diameter of
13、the screw thread, dimensional data for the following features have been calculated and are listed in Table IV: Nominal length (Ln) Length of assembled insert (L) Tapped hole diameters (V, VI, V2) Depth of drilling and tapping (FP, FB, and H) Countersink diameters (M) Required bolt thread projection
14、(J and K) For all other nonstandard variations in nominal length, the above dimensions shall be calculated from the formulas given in Table III, using rounding procedures contained in ASTM E380-84. See Table I for MS part numbers and nominal lengths of available inserts. INSERT LENGTH SELECTION: For
15、 applications where the tensile strength of the installed insert is a consideration, Table II will aid in applying the standard design practice of relating the tensile strength of the bolt material against the shear strength of the parent or boss material to develop the full load value of the bolt r
16、ather than stripping the parent or tapped material. In using this table, the following factors must be considered. Actual bolt tensile strength, particularly in the lower bolt tensile ranges, may be significantly higher than the nominal values. This should be considered in insert length selection. T
17、he parent material shear strengths are for room temperature. Elevated temperatures significantly reduce shear strength values; compensation should be made when required. When parent material shear strength falls between two tabulated values, use the lower of the two. SHEET 2 USE OF OR RELIANCE UPON
18、THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT CUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PROCURED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION. OR (2) THE
19、EXISTENCE OF OR APPLICABILITY THERFTO OF PATENT OR TRADEMARK RIGHTS. Copyright Aerospace Industries Association of America Inc. Provided by IHS under license with AIA/NASNot for ResaleNo reproduction or networking permitted without license from IHS-,-Aerospace NATIONAL AEROSPACE STANDARD O COPYRIGHT
20、 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED Industries Association 7. 8. 9. 9.1 9.2 1 o. DEPTH OF RECOMMENDED MINIMUM TAP DRILL HOLE: The tabulated depth of blind hole for thread tapping allows sufficient depth for assembled insert top coil to be 1.5 pitches below bos
21、s surface. For insert sizes .3125 and smaller, drill depth FP provides for minimum full thread depth H, using a plug tap having 4 pitches tap chamfer, plus a length equal to 0.5 x nominal insert size to clear the tap external center (conical end), plus 1 pitch tap end clearance. For insert sizes lar
22、ger than .3125, drill depth FP is for plug tap having 4 pitches tap chamfer, plus 1 pitch tap end clearance. Drill depth FB is for bottoming taps having 2 pitches tap chamfer, plus 1 pitch tap end clearance. If tap drill holes are not countersunk, the assembled insert top coil may be 0.5 pitch max b
23、elow boss surface which allows for a 1 pitch reduction in tabulated depth of blind drilled hole dimensions. DEPTH OF FULL THREAD OF TAPPED HOLE: For thru or blind tapped holes with a countersink as specified in Table IV, the Minimum Full Thread, H (also minimum flange thickness for thru hole), equal
24、s nominal length of insert, Ln, as specified in the tabulation, plus 1 pitch. For thru or blind tapped holes without countersink, the minimum full thread (also minimum flange thickness for thru hole) shall not be less than the nominal length of insert, Ln. LENGTH OF BOLT THREAD PROJECTION: INSERT WI
25、TH TANG REMOVED: The maximum length of bolt thread projection, J, into the assembled insert in a blind hole is equal to the minimum design depth of the tap drill hole, FP or FB. The minimum length of bolt thread projection to provide full thread engagement and thus to ensure full development of pote
26、ntial joint tensile strength is Jmin. It is equal to the maximum length, L, of the insert, plus 3 pitch (the maximum depth of the assembled insert top coil from boss surface, 1.5 pitch, plus bolt chamfer 1.5 pitch). Bolt projection, Jmin, will also ensure full engagement with the grip coil or coils
27、of a screw locking insert. INSERT WITHOUT TANG REMOVED: The maximum length of bolt thread projection, K, into the assembled insert when tang is not removed is the minimum length of insert plus 0.25 pitch. COUNTERSINK AND COUNTERBORE: The values given in Table IV for Depth of Hole, FP, FB, Minimum Fu
28、ll Thread H, and Length of Bolt Projection, J and K, are measured from the top surface of the boss or piece and are based on installing the insert below the countersink as in 11 .l. If a counterbore or countersink other than that shown is required or no countersink is used, the values for FP, FB, H,
29、 J, and K must be modified to compensate. SHEET 3 I NASM33537 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PROCURED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLA
30、IM RESPECTING (1) THE SUITABILIN OF ITEMS FOR ANY PARTICULAR APPLICATION, OR (2) THE EXISTENCEOF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. Copyright Aerospace Industries Association of America Inc. Provided by IHS under license with AIA/NASNot for ResaleNo reproduction or networking pe
31、rmitted without license from IHS-,-Aerospace NATIONAL AEROSPACE STANDARD o COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED Industries Association 11. 11.1 11.2 11.3 12. 13. 14. INSTALLATION OF INSERT: WITH COUNTERSUNK HOLE: The top edge of the insert shall be ins
32、talled 0.75 to 1.5 below top surface of the tapped hole. WITHOUT COUNTERSUNK HOLE: The top edge of the insert shall be installed 0.25 to 0.5 below top surface of tapped hole. TANG REMOVAL: The tang should be removed from the insert after installation. BLIND HOLE ASSEMBLY (WITHOUT REMOVAL OF TANG): W
33、hen the insert tang is not removed, as may be the case with blind hole applications, an insert 0.5 diameter longer than the required nominal length will fulfill the necessary bolt-insert full thread engagement, provided that the bolt projection satisfies the original Jmin and the longer insert Kmax
34、tabulated values. GAGING PRACTICE: Accuracy of the finished thread, when the insert is installed, is dependent upon the accuracy of the tapped hole. If the finished tapped hole gages satisfactorily, the installed insert will be within the thread tolerance when the insert meets the drawing requiremen
35、ts. It is, therefore, not necessary to gage the installed insert. After the insert is installed, the GO thread plug gage may not enter freely because the insert may not have been fully seated in the tapped hole; however, the insert should become seated after a bolt or screw is installed and tightene
36、d. PERMITTED MODIFICATIONS: Values for FP, FB, H, J, K, M, and installation depth of insert may be modified to suit requirements for production tooling, design, assembly, etc. See Table III for formulas. Countersink included angle may be modified from 120 f5O to 90 provided that for UNC sizes .190-2
37、4 and smaller and UNF sizes .4375-20 and smaller, the top edge of the insert shall be installed 1 .O to 1.5 below top surface of the tapped hole. I NASM33537 SHEET 4 USE OF OR RELIANCE UPON THIS DOCUMEhT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOCUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTI
38、FY CONFORMANCE OF ITEMS PRCCLRED UNDER hATIONAL AEROSPACE STANDARDS AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING 111 THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION, OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARKRIGHTS: Copyright Aerospace Industries Association o
39、f America Inc. Provided by IHS under license with AIA/NASNot for ResaleNo reproduction or networking permitted without license from IHS-,-Aerospace NATIONAL AEROSPACE STANDARD Industries Association O COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED INSERT NOMINAL
40、 LENGTH TABLE I. PART NUMBERS. FREE RUNNING INSERTS SCREW LOCKING INSERTS CRES AMS 7245 CRES MIL-1-8846 COARSE I FINE COARSE I FINE MS122076 MS124651 MS21209C0210 I MS21209F0310 1 DIA 1.5 DIA 2 DIA thru thru thru thru MS122115 MS124690 MS21209C241 O MS21209F2410 MSl22116 MS124691 MS21209C0215 MS2120
41、9F0315 MS122155 MS124730 MS21209C2415 MS21209F2415 MSl22156 MS124731 MS21209CO220 MS21209F0320 thru thru thru thru thru thni thru thru 2.5 DIA MS122195 MS124770 MS21209C2420 MS21209F2420 MSl22196 MS124771 MS21209C0225 MS21209F0325 thru thru thru thru /! ?O* 2. ! 3 DIA ,COUN TEFiSltdl?. ! I I I PITCH
42、 DRILL 2 PITCH DRILL CLEARANCE PLUS LENGTH OF TAP EXTERNAL CENTER +-REDUCED FIRE.T COIL (CONICAL END) CHAMFER TAP MS122235 MS12481 O MS21209C2425 MS21209F2425 MS122236 MS124811 MS21209C0230 MS21209FO330 MSl22275 MS124850 MS21209C2430 MS21209F2430 thru thru thru thru -NOTCH 4 PITCH PLUG- CHAMFEE TAP
43、FIGURE I NASM33537 SHEET 5 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY CIIDDI IFRS OR - -.-.-.-. CERTIFY CONFORMANCE OF ITEMS PROCURED UhDER NATIONAL AEROSPACE STANDARDS AIA MAKES NO REPRESENON OR CLAIM RESPECTING (i) THE SLITA
44、BILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTEhCE OF OR APPLICABILFN THERETO OF PATENT OR TRADEMARK RIGHTS Copyright Aerospace Industries Association of America Inc. Provided by IHS under license with AIA/NASNot for ResaleNo reproduction or networking permitted without license from
45、 IHS-,-Aerospace NATIONAL AEROSPACE STANDARD Industries Association O COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVE0 125,000 2-112 2 1-112 1-112 1 1 TABLEII. 1 Shear Strength of Material (psi) (Alum., 132,000 3 2 2 1-112 1-112 1 Mag, Steel) 10,000 54,000 2 1-112
46、 1 1 1 1 1 15,000 20,000 75,000 2- 112 1-112 1-112 1 1 1 1 25,000 30,000 40,000 50,000 INGTHS OF THREAD ENGAGEMENT IN TERMS OF NOMINAL THREAD SIZE. Bolt Material Minimum Ultimate Tensile Strength (psi) 96,000 3 2 1-112 1-112 1 1 1 108,000 3 2-112 2 1-112 1-112 1 1 - TP INFORMATION REQUIRED (SEE FIGU
47、RE 1) Length of Assembled Insert (L) Free Running and Screw Locking Depth of Recommended Minimum Tap Drill (FP or FB) for Blind Holes (Paragraph 7) Depth of Full Thread of Blind Tapped Hole also Min. Flange Thickness for Thru Tapped Hole (H) (Paragraph 8) Countersink or Counterbore (M) (Paragraph IO
48、) Length of Bolt Thread Projection into Assembled Insert (J or K) (Paragraph 9) WHERE: Ln = Nominal Length of Insert (Table IV) P = Pitch = Irhreads Per Inch B =Wire Height from MS21209 160,000 3 2-112 2 2 1-112 1 180,000 3 2- 112 2 1-112 1-112 220,000 - - 3 2-112 2-112 2 1-112 II. FORMULA Lmin = Ln
49、 - 0.75P Lmax = Ln - 0.5P 1. For Plug Taps .3125 Nominal Diameter and smaller: FP = Ln + 6P + 0.5 Dn 2. For Plug Taps larger than ,3125: FP = Ln + 6P 3. For Botloming Taps: FB = Ln + 4P Hmin = Ln + 1P Mmin = V2 max Class 38 + Bmax + Dmin Mmax = Mmin + .O30 1. Insert - Tana Removed Jmax = FPmin (blind hole depth for plug tap) Jmax = FBmin (blind hole depth for bottoming tap) Jmin = Lmax + 3P Jmin = Ln + 2.5P or 2. insert - Tana Not Removed Kmax = Lmin + 0.25P D =Wi
