SCREW THREAD. NASM33537 Datasheet

NASM33537 THREAD. Datasheet pdf. Equivalent

NASM33537 Datasheet
Recommendation NASM33537 Datasheet
Part NASM33537
Description INSERT / SCREW THREAD
Feature NASM33537; ,t i:sr! t14?-/'r!/)t) I !-Flli I rrJ{!a,l.4frrr! NATI.NALAER'SPA.ESTANDARD ffi O COPYRIGHT 2013 AE.
Manufacture AIA
Datasheet
Download NASM33537 Datasheet




AIA NASM33537
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I TABLE OF CONTENTS
FED. SUPPLY CLASS
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6. DTMENSTONAL DATA
7. DEPTH OF RECOMMENDED MINIMUM TAP DRILL HOLE
8. DEPTH OF FULL THREAD OF TAPPED HO1E...........
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9. LENGTH OF BOLT THREAD PRO]ECTION
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10 COUNTERSINK AN D COUNTERBORE
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TABLES
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-TABLE II LENGTHS OF THREAD ENGAGEMENT IN TERMS OF NOMINAL THREAD SIZE.,.,.....,..
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TABLE IIi _ FORMULAS FOR DIMENSIONS,....,......
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@ covrerrElY REVISED
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Reproduced By IHS
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THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MS33537, REVISION E, AMENDMENT 1. PART NUMBERS REMAIN MS33537
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TITLE
INSERT, SCREW THREAD, HELTCAL COrL rNCH SERTES,
COARSE AND FINE THREAD, STANDARD ASSEMBLY
DIMENSIONS FOR
CLASSIFICATION
DESIGN STANDARD
NASM33s37
SHEET 1 OF 13
USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NANONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUAUFY SUPPLIERS OR CERNFY
CONFORIYANCE OF ITEIVIS PRODUCED I.]NDER NATIONAL AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF
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AIA NASM33537
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NATIONAL AEROSPACE STANDARD
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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. InserLs are installed by torquing through a diametral tang which
is notched for tang removal.
MATERIAL
As specified on the drawing.
THREADS
Assembled insefts, 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 inseft at the minor diameter, the assembled insert will accept external
threaded pafts which are threaded to ASBB79. 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 inseft.
TAPPED HOLE
600 Unified Internal thread form with the minimum major diameter based on a truncation to 0.125p.
Designation for taoped hole
The drawing note for the tapped hole, per table IV, that will accept the helical coil inseft shall be in accordance with
the following examples:
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EXAMPLE 1
,3125-24 UNF-3B HELICAL COIL
INSERT THD PER NASM33537
.67 MIN FULL THD DEPTH
For Blind Hole (Based on 2 Diameter
Engagement) (Minor Diameter Drill Depth
Tolerance approx. .060 or as otherwise
appropriate)
,3125.24 UNF-38 HELICAL COIL
INSERT THD THRU PER NASM33537 INSTALL
INSERT ,75-T,5 TURNS BELOW SURFACE
-REMOVE TANG (NOT REQUIRED WITH
TANGLESS INSERTS)
For thru hole with Insert being Assembled
(Based on 2 Diameter Engagement)
EMMPLE 2
MINOR DIA .3215-.3288 x .791-.851 DEEP
.36-.39 DIA x 115o-125o CSK
THD PER NASM33537 FOR
,3125-24 UNF-38 HELICAL COIL INSERT
.67 MIN FULL THD DEPTH
PITCH DIA ,3395-,3427
MA]OR DIA.3666 MIN
MINOR DIA .3215-.3288 THRU
.36-.39 DIA x 115o-125o CSK
THD THRU PER NASM33537 FOR
,3125-24 UNF-38 HELICAL COIL INSERT
PITCH DIA .3395-.3427
MAJOR DIA .3666 MIN
INSTALL INSERT ,75-T,5 TURNS
BELOW SURFACE
REMOVE TANG - (NOT REQUIRED WITH
TANGLESS INSERTS)
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USE OF OR RELIANCE UPON THIS DOCUN4ENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY
CoNFoRTYANCE OF ITEI4S PRODUCED UNDER NATTONAL AEROSPACE STANDARDS. ArA I4AKES NO REPRESENTATION OR CLAITY RESPECTTNG (1) THE SUTTABILITY OF



AIA NASM33537
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NATT'NALAER,',A.E'TANDARD
@ COPYRIGHT 2013 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTS RESERVED
REDUCED FIRST COIL
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The first coil of the free inseft adjacent to the tang has been reduced in diameter on the larger inserts to facilitate
stafting the inseft into the tapped hole.
DIMENSIONAL DATA
For free running and screw locking insefts having a nominal length of 1, 7.5, 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 inseft (L)
Tapped hole diameters (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 contained in ASTM SI 10.
See Table I for MS part numbers and nominal lengths of available insefts.
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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 strength 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.
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.
The 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.
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 sudace. For inseft 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 inseft 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 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 countersun( the assembled insert top
coil may be 0.5 pitch max below boss suface which allows for a 1 pitch reduction in tabulated depth of blind drilled
hole dimensions.
DEPTH OF FULL THREAD OF TAPPED HOIE
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 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.
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REVISION
2
NASM33537
USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY. AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY
CONFORN{ANCE OF ITEMS PRODUCED UNDER NATIONAL AEROSPACE STANDARDS. AIA N4AKES NO REPRESENTATION OR CLAIN4 RESPECTING (1) THE SUITABILITY OF







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