1、AEROSPACE STANDARDAS1561Issued 1981-11Reaffirmed 2006-05Stud, Locked In - Ring, Straight,Installation and Removal Of1. PURPOSE AND SCOPE:1.1 This Aerospace Standard provides minimum design, installation and removal requirements for AS 3319 thru AS 3322 studs and is applicable when specified on engin
2、eering drawings, or in procurement documents.2. GENERAL DESIGN INFORMATION:2.1 These straight studs are ring locked to prevent the stud from rotating during service and while assembling or removing the nut. The stud shear engagement area to resist tensile loads is shown in Table I.TABLE ISAE Technic
3、al Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the
4、sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2006 SAE International All rights reserved. No part of this publication may be reprodu
5、ced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776
6、-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org RATIONALE This document has been reaffirmed to comply with the SAE 5-year Review policy. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from
7、 IHS-,-,-SAE AS1561 - 2 -2.2 Dimensioning in inches.2.3 Studs AS 3319 thru AS 3322 are to be installed per this document into stud holes prepared Per AS 1620.2.4 Installed stud will have an “A“ projection above the boss equivalent to the “A“ dimension on the stud drawing as shown in AS 3319 thru AS
8、3322.2.5 When ring lock studs are installed in soft boss materials (Al, Mag, Brass, Bronze, etc.) the lockring is of sufficient hardness for its external serrations to broach their own way into the boss. When studs are installed in hard boss materials (Steel, Ti, Heat Resistant alloy, etc.) it will
9、be necessary to broach serrations in the counterbore area prior to stud installation.3. DESIGN REQUIREMENTS:3.1 Minimum data to be specified on engineering drawing or specification:3.1.1 Boss diameter to be at least the minimum specified in AS 1620.3.1.2 Location of holes and thread size. If tap dri
10、ll depth is not thru, specify control depth dimensions.3.1.3 Applicable stud part number (AS 3319 thru AS 3322).3.1.4 Install stud per AS 1561.3.1.5 If material requires a corrosion protective coating, so specify.4. INSTALLATION OF STUD:4.1 Installation into AS 1620 SOFT BOSS (Al, Mag, Brass, Bronze
11、):4.1.1 Apply a corrosion protective coating in the prepared hole if applicable (see 3.1.5).4.1.2 Screw the stud into the prepared hole by hand until the lockring contacts the top of boss and the top of lockring bears against the stud serration stop (Figure 2). This will automatically provide the pr
12、oper stud projection “A“ (Figure 1).4.1.3 Using the applicable lockring drive tool shown in Table II, drive the lockring into the counterbore until the face of the tool bears against the boss surface. The lockring will be installed flush to .010 below the boss surface per Figures 1 & 2.4.1.4 When ap
13、plicable, wipe away excess corrosion protective coating from the boss surface.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1561 - 3 -FIGURE 1FIGURE 2Copyright SAE International Provided by I
14、HS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1561 - 4 -TABLE II TOOLING4.2 Installation into AS 1620 HARD BOSS (Steel, Ti and Heat Resistant Alloys):4.2.1 Pre-broach counterbore area (Figure 3):4.2.1.1 The Modified Minor Diameter o
15、f the boss thread (AS 1620) acts as a guide bushing for the broach tool pilot to maintain the concentricity of the tapped hole with the broached serrations.4.2.1.2 Select the applicable manual broach tool per Table II and back off nut from top of body approximately .250 inch. Place the tool pilot in
16、to the tapped hole and apply sufficient force to the top of mandrel to allow the cutter to broach into the counterbore. When the external shoulder of the mandrel contacts the internal shoulder of the tool body, broaching is complete. Screw the nut down against the body. Apply a wrench to the nut and
17、 continue turning until the cutter is jacked out of the boss. Remove chips.4.2.1.3 The depth of the broached serrations are to be per Table III & Figure 3.4.2.1.4 For a production type machining setup, the wobble broach tool shown in Table II is recommended.4.2.2 Studs installed in pre-broached mate
18、rials and reinstallation of studs in bosses of any material:4.2.2.1 Apply corrosion protective coating in the prepared hole if applicable (see 3.1.5).4.2.2.2 A .002 maximum thickness shim shall be used between the lockring and the broached surface to prevent premature engagement of serrations. Screw
19、 the stud into the prepared hole until the top of the lockring has stopped against the upper part of the stud serrations and the lower points of the lockring external serrations rest on the shim surface. This will automatically provide the proper stud projection (Figures 1 & 2).Copyright SAE Interna
20、tional Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1561 - 5 -FIGURE 3 - AS 1620 HARD BOSSTABLE III4.2.2.3 Remove shim. If the lockring external serrations align with the serrations in the counterbore, drive the lockri
21、ng using the applicable lockring drive tool (Table II). If the serrations do not align turn the stud clockwise until they do, then drive the lockring. The lockring will be installed flush to .010 below the boss surface per Figure 1.4.2.2.4 When applicable, wipe away excess corrosion protective coati
22、ng from the boss surface.5. STUD REMOVAL:5.1 CAUTION: The AS 3319 thru AS 3322 Studs were designed with a small external diameter lockring to allow their usage in locations where edge distance is a problem. The lockring is too small in diameter to use a typical hollow-mill tool (normally used in rem
23、oving ring-locked step studs) since the milling tool would be too thin to take the cutting loads.5.2 The following removal method is suggested:5.2.1 Cut the stud off approximately flush with the surface of the parent material.Copyright SAE International Provided by IHS under license with SAENot for
24、ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS1561 - 6 -5.2.2 Mark the center of the remaining stud by use of a center punch.5.2.3 Locate the noted drill (No. 1 in Table IV) directly over the center of the part and drill into the stud to depth shown.5.2.4 Center th
25、e larger drill (No. 2 in Table IV) over the small hole and drill to depth shown. This will remove the engagement between the stud serrations and the internal serrations of the lockring.5.2.5 The remaining lockring will have a very thin wall. A sharp punch will easily break it away from the parent ma
26、terial. Remove all pieces of the lockring.5.2.6 Drive a screw extractor into the small hole in the stud and apply a counterclockwise torque to remove the remaining stud portion.5.2.7 Clean the hole.TABLE IV6. STUD REINSTALLATION:6.1 These studs are unique in that the same size stud can be reinstalle
27、d. Use the same part number as specified on the original equipment.6.2 Reinstall the new stud as described in 4.2.2.PREPARED BY SAE COMMITTEE E-25,GENERAL STANDARDS FOR AEROSPACE PROPULSION SYSTEMSCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
