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1、 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLVD. ARLINGTON, VA 22209 ISSUE DATE: MAY 2002 REVISION DATE: MARCH 10, 2009 FED. SUPPLY CLASS 5340 THIS DRAWING SUPERSEDES ALL ANTECEDENT STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER THAN SIX MONTHS FROM TH
2、E LAST REVISION DATE. COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED NATIONAL AEROSPACE STANDARD THIRD ANGLE PROJECTION CUSTODIAN NATIONAL AEROSPACE STANDARDS COMMITTEE TITLE INSERT, SCREW THREAD, HELICAL COIL, INCH SERIES, COARSE AND FINE THREAD, STANDARD ASSEM
3、BLY DIMENSIONS FOR NASM33537 SHEET 1 OF 14 CLASSIFICATION PART STANDARD REVISION 1 PROCUREMENT SPECIFICATION NONE FORM 08-02 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 PRODUCED UNDER N
4、ATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. GENERAL INSTRUCTIONS 1. DESCRIPTION: Helical coil inserts are screw thread bushing
5、s coiled from diamond shaped cross-section wire. They are screwed into tapped holes to form nominal size internal threads. Inserts are installed by torquing through a diametral tang which is notched for tang removal. 2. MATERIAL: As specified on the drawing. 3. THREADS: Assembled inserts, Classes 2B
6、 and 3B, are controlled by the tolerance range of the tapped hole into which insert is fitted. Due to the radius on the crest of the insert at the minor diameter, the assembled insert will accept external threaded parts which are threaded to AS8879. The grip coil or coils of the screw locking insert
7、 are shaped to provide a prevailing torque when the screw is installed in the assembled insert. 4. TAPPED HOLE: 60 Unified Internal thread form with the minimum major diameter based on a truncation to 0.125p. 4.1 Designation for tapped hole: The drawing note for the tapped hole, per table IV, that w
8、ill accept the helical coil insert shall be in accordance with the following examples: EXAMPLE 1 .3125-24 UNF-3B HELICAL COIL .3125-24 UNF-3B HELICAL COIL INSERT THD PER NASM33537 INSERT THD THRU PER NASM33537 .67 MIN FULL THD DEPTH INSTALL INSERT .75-1.5 TURNS BELOW SURFACE REMOVE TANG (NOT REQUIRE
9、D WITH TANGLESS INSERTS) For Blind Hole (Based on 2 Diameter Engagement) (Minor Diameter Drill Depth Tolerance approx. .060 or as otherwise appropriate) For thru hole with Insert being Assembled (Based on 2 Diameter Engagement) THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MS33537, REVISION E, AME
10、NDMENT 1. PART NUMBERS REMAIN MS33537 ? ? ? NATIONAL AEROSPACE STANDARD COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FORM 08-02 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CE
11、RTIFY CONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. THIS DRAWING SUPERSEDES ALL ANTECEDENT
12、STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER THAN SIX MONTHS FROM THE LAST REVISION DATE. NASM33537 SHEET 2 REVISION 1 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLVD. ARLINGTON, VA 22209 EXAMPLE 2 MINOR DIA .3215-.3288 x .791-.851 DEEP .36-.39 DIA x
13、115-125 CSK THD PER NASM33537 FOR .3125-24 UNF-3B HELICAL COIL INSERT .67 MIN FULL THD DEPTH PITCH DIA .3395-.3421 MAJOR DIA .3666 MIN MINOR DIA .3215-.3288 THRU .36-.39 DIA x 115-125 CSK THD THRU PER NASM33537 FOR .3125-24 UNF-3B HELICAL COIL INSERT PITCH DIA .3395-.3421 MAJOR DIA .3666 MIN INSTALL
14、 INSERT .75-1.5 TURNS BELOW SURFACE REMOVE TANG - (NOT REQUIRED WITH TANGLESS INSERTS) 5. REDUCED FIRST COIL: The first 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. 6. DIMENSIONAL DATA: 6.1 For
15、 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 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 d
16、iameters (V, V1, V2) Depth of drilling and tapping (FP, FB, and H) Countersink diameters (M) Required bolt thread projection (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 cont
17、ained in ASTM SI 10. 6.2 See Table I for MS part numbers and nominal lengths of available inserts. 6.3 INSERT LENGTH SELECTION: For 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 s
18、trength of the bolt material against the shear strength of the parent or boss material to develop the full load value of the bolt rather than stripping the parent or tapped material. In using this table, the following factors must be considered. 6.3.1 Actual bolt tensile strength, particularly in th
19、e lower bolt tensile ranges, may be significantly higher than the nominal values. This should be considered in insert length selection. 6.3.2 The parent material shear strengths are for room temperature. Elevated temperatures significantly reduce shear strength values; compensation should be made wh
20、en required. 6.3.3 When parent material shear strength falls between two tabulated values, use the lower of the two. ? ? ? -,-,- NATIONAL AEROSPACE STANDARD COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FORM 08-02 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NA
21、TIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICAB
22、ILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. THIS DRAWING SUPERSEDES ALL ANTECEDENT STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER THAN SIX MONTHS FROM THE LAST REVISION DATE. NASM33537 SHEET 3 REVISION 1 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLVD
23、. ARLINGTON, VA 22209 7. 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 boss surface. For insert sizes .3125 and smaller, drill depth FP provides for minimum full thread d
24、epth 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 larger than .3125, drill depth FP is for plug tap having 4 pitches tap chamfer, plus 1 pitch tap en
25、d 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 below boss surface which allows for a 1 pitch reduction in tabulated depth of blind drilled hole
26、dimensions. 8. 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), equals nominal length of insert, Ln, as specified in the tabulation, plus 1 pitch. For thru or bli
27、nd 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. 9. LENGTH OF BOLT THREAD PROJECTION: 9.1 INSERT WITH TANG REMOVED: The maximum length of bolt thread projection, J, into the assembled i
28、nsert 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 potential joint tensile strength is Jmin. It is equal to the maximum length, L, of the ins
29、ert, 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 of a screw locking insert. 9.2 INSERT WITHOUT TANG REMOVED: The maximum length of bolt
30、 thread projection, K, into the assembled insert when tang is not removed is the minimum length of insert plus 0.25 pitch. 10. COUNTERSINK AND COUNTERBORE: The values given in Table IV for Depth of Hole, FP, FB, Minimum Full Thread H, and Length of Bolt Projection, J and K, are measured from the top
31、 surface of the boss or piece and are based on installing the insert below the countersink as in 11.1. If a counterbore or countersink other than that shown is required or no countersink is used, the values for FP, FB, H, J, and K must be modified to compensate. -,-,- NATIONAL AEROSPACE STANDARD COP
32、YRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FORM 08-02 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 PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA
33、 MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. THIS DRAWING SUPERSEDES ALL ANTECEDENT STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER
34、THAN SIX MONTHS FROM THE LAST REVISION DATE. NASM33537 SHEET 4 REVISION 1 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLVD. ARLINGTON, VA 22209 11. INSTALLATION OF INSERT: 11.1 WITH COUNTERSUNK HOLE: The top edge of the insert shall be installed 0.75p to 1.5p below top surface of t
35、he tapped hole. 11.2 WITHOUT COUNTERSUNK HOLE: The top edge of the insert shall be installed 0.25p to 0.5p below top surface of tapped hole. 11.3 TANG REMOVAL: The tang should be removed from the insert after installation. 12. BLIND HOLE ASSEMBLY (WITHOUT REMOVAL OF TANG): When the insert tang is no
36、t 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 tabulated values. 13. GAG
37、ING 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 requirements. It is, therefore,
38、 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 tightened. 14. PERMITTED MODI
39、FICATIONS: 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 +/-5 to 90 provided that for UNC sizes .190-24 and smaller an
40、d UNF sizes .4375-20 and smaller, the top edge of the insert shall be installed 1.0 to 1.5p below top surface of the tapped hole. NATIONAL AEROSPACE STANDARD COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FORM 08-02 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY N
41、ATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICA
42、BILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. THIS DRAWING SUPERSEDES ALL ANTECEDENT STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER THAN SIX MONTHS FROM THE LAST REVISION DATE. NASM33537 SHEET 5 REVISION 1 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLV
43、D. ARLINGTON, VA 22209 TABLE I. PART NUMBERS. INSERT FREE RUNNING INSERTS SCREW LOCKING INSERTS NOMINAL CRES AS7245 CRES NASM8846 LENGTH COARSE FINE COARSE FINE MS122076 MS124651 MS21209C0210 MS21209F0310 1 DIA thru thru thru thru MS122115 MS124690 MS21209C2410 MS21209F2410 MS122116 MS124691 MS21209
44、C0215 MS21209F0315 1.5 DIA thru thru thru thru MS122155 MS124730 MS21209C2415 MS21209F2415 MS122156 MS124731 MS21209C0220 MS21209F0320 2 DIA thru thru thru thru MS122195 MS124770 MS21209C2420 MS21209F2420 MS122196 MS124771 MS21209C0225 MS21209F0325 2.5 DIA thru thru thru thru MS122235 MS124810 MS212
45、09C2425 MS21209F2425 MS122236 MS124811 MS21209C0230 MS21209F0330 3 DIA thru thru thru thru MS122275 MS124850 MS21209C2430 MS21209F2430 NASM21209 offers Cadmium Plating and Dry Film Lubricant Coating options. ? NATIONAL AEROSPACE STANDARD COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, IN
46、C. ALL RIGHTS RESERVED FORM 08-02 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 PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITAB
47、ILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARKS RIGHTS. THIS DRAWING SUPERSEDES ALL ANTECEDENT STANDARD DRAWINGS FOR THE SAME PRODUCT AND SHALL BECOME EFFECTIVE NO LATER THAN SIX MONTHS FROM THE LAST REVISION DATE. NASM33537 SHEE
48、T 6 REVISION 1 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA , INC 1000 WILSON BLVD. ARLINGTON, VA 22209 TABLE II. LENGTHS OF THREAD ENGAGEMENT IN TERMS OF NOMINAL THREAD SIZE Bolt Material Minimum Ultimate Tensile Strength (psi) Shear Strength of Material (psi) (Alum., Mag, Steel) 54,000 75,000 96,00
49、0 108,000 125,000 132,000 160,000 180,000 220,000 10,000 2 2-1/2 3 3 - - - - - 15,000 1-1/2 1-1/2 2 2-1/2 2-1/2 3 3 - - 20,000 1 1-1/2 1-1/2 2 2 2 2-1/2 3 3 25,000 1 1 1-1/2 1-1/2 1-1/2 2 2 2-1/2 2-1/2 30,000 1 1 1 1-1/2 1-1/2 1-1/2 2 2 2-1/2 40,000 1 1 1 1 1 1-1/2 1-1/2 1-1/2 2 50,000 1 1 1 1 1 1 1 1-1/2 1-1/2 NATIONAL AEROSPACE STANDARD COPYRIGHT 2009 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED FORM 08-02 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATI