1、MIL-T-24634 20 7779706 0373202 5 MIL-T-24634(SH) 25 July 1984 MILITAKY SPECIFICATION TREADS, COMPOUND-FILLED, FOR INCLINED LADDERS This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Departme
2、nt of Defense. 1. SCOPE - 1.1 Scope. This specification covers full treads and cap treads which have slip-resistant compound-filled dovetail grooves in extruded aluminum bases. 1.2 - Classification. Treads shall be of the following types, as specified (see 6.2.1): Type I - Full tread with end plates
3、. Type IA - Full tread without end plates. Type IT. - Cap tread. 2. APPLICABLE DOCUMENTS -2.1 GovernmeKt documents. 2.1.1 Specifications and standards. Unless otherwise specified, the fol- lowing specifications and standards of the issue listed in that issue of the Department of Defense Index of Spe
4、cifications and$tandards (DoDISS) specified in the Solicitation form a part of this specification to the extent specified herein. SPECIFLCATIONS FEDERAL QQ-A-200/8 - Aluminum Alloy 6061, Bar, Rod, Shapes, Tube and Wire, Extruded. SS-W-110 - Water-Repellent, Colorless, Silicon Resin Base. PPP-B-601 -
5、 Boxes, Wood, Cleated Plywood. BeneEicial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Comrnand, SEA 5523, Department OE the Navy, Washington, DC 20362 by using the self-add
6、ressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 2090 THIS DOCUMENT CONTAINS PAGES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2qb3q 20 9779706 0373203 7 W MIL-T-246
7、34( SH) MILITARY MIL-P-116 - Preservation, Methods of, MIL-I,-10547 - Liners, Case, and Sheet, Overwrap; Water-Vapor- proof or Waterproof, Flexible. STANDARDS FEDERAL FED-STD-123 FED-STD-SO1 - Federal Test Method Standard Floar Coverings, - Marking for Shipment (Civil Agencies), Resilient, Nontextil
8、e: Sampling and Testing. MIL I TARY XIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-129 - Marking for Shipment and Storage. MIp-STD-278 - Fabrication Welding asd inspection, and Casting by Attributes. Inspection and Repair for Machinery, Piping and Pressure Vessels in Ships of Un
9、ited States Navy. Waterproofing; with Apprypriate .Test: Methods. for Wear, Slip-Resistance and Impact. MIL-STD-1186 - Cushioning, Anchoring, Bracing, BLocking arid MIL-STD-2151 - nclined Ladder Tread Test Methods and Equipnient (CopieS.of specifications and standards required by contractors in conn
10、ec- tion with specific acquisition functions should be obtained rom the contracting activity or as directed by the contractiqg officer.) 2.2 Ofher publications. The following documents form a part of this speci- fication to the extentspecified herein. The issues of the documenta which are indicated
11、as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC., AGENT National Motor Freight Classification (Application for copies should be addressed to the National Motor Freight Traffic Association, Inc.,
12、 ATA TRAFFIC Dept. , 1616 “P“ Street , NW, Washington, DC 20036.) UNIFOW CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratiogs, Rules and Regulations (Application for copies should be addressed to the Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106, 222
13、South Riverside Plaza, Chicago, IL 60606,) (Industry association specifications and standards are geriecally available for reference from libraries. They are also distributed among technical groups and using Federal agencies.) i 2.3 Order of precedence. In the event of a conflict between the text of
14、 this speciEipatioa and the reference cited herein, tho text of this specifica- tion shall take precedence. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-24b34 20 E 7777706 0173204 7 M 3. REQUIREMENTS 3.1 First article. When specified (see 6
15、.2.1), tread samples shall be subjected to first article inspection (see 4.3 and 6.3). 3.2 Material. 3.2.1 Bases. Extruded aluminum bases and end plates shall conform to Alloy 6061-T6 in accordance with QQ-A-200/8. 3.2.2 Filler. The filler material shall an inorganic binder and abrasive grain compos
16、ite formulated to comply with the physical appearance and performance as specified herein. Abrasive grain shall be 100 percent virgin grain aluminum oxide (Al203) with a mohs scale hardness rating of 9. The grain quantity and size grading shall be selected to achieve the highest concentration of abr
17、asive grain consistent with the specified requirements or impact,.wear and slip- . resistance. The filler shall be worked to provide a uniform, flattened surEace which extends above the surface of the extrusion by a distance of 0.047 inch. The filler shall not overlap the groove edge by more than 0.
18、031 inch. aluminum shall be cleaned of all extraneous filler material and the filler edges shall- have a straight and uniform appearance. Exposed 3.3 Design and construction. Treads shall be of the design, construction and physical dimensions as shown on figures 1 through 8. The type, width and leng
19、th shall be as specified (see 6.2.1). 3.3.1 Tolerances. Tolerances on dimensions as shown on figures 1 through 8 shall be as follows: Overall length: Plus or miiius 0.063 inch. Bolt hole diameters: Plus or minus 0.016 inch. Bolt hold spacing end plates: Plus or minus 0.031 inch. Groove width: Plus o
20、r minus 0.016 inch. Groove spacing: Plus or miniis 0.031 inch. Extrusion thickness: Plus 0.010, minus 0.005 inch. Radii: Plus or minus 0.010 inch. Angles: Plus or minus 1 degree, O minute. Squareness of end plates: Height of filler above extrusion: Plus or minus 0.016 inch. Plus or minus O degre-e,
21、30 miiiutes . 3.3.2 Color. The binding agent used in the filler shall be pigmented black. Aluminum shall remain self-colored. 3.3.3 Sealing. After fabrication, treads shall be given two coats of clear sealer to seal the filler and grooves against the intrusion of moisture. The sealer shall comply wi
22、th the performance requirements as specified in SS-W-110. When tested as specified in 4.6.4, treads shall not exhibit any signs of deterioration, cracking OK separation froin the base extrusion. 3.3.4 Welding. delding of end plates shall be in accordance with MIL-STD-278 and as shown on figure 1. We
23、lding shall be from the underside of the tread and all excessive weld spatter shall be removed. End plates shall be smooth flat and square (see 3.3.1) and the edges shall be flush with the outside surfaces of the tread extrusion. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted
24、 without license from IHS-,-,-MIL-T-24b34 20 9 7779706 0173205 O MIL-T-24634(SH) 3.4 Perf ormance. 3.4.1 Strength. O, 3.4.1.1 Type I deflection. Rien tested in accordance with 4.6. .l, deflec- tionshall not exceed 0.10 inch and there shall be no permanent deformation, 3.4.1.2 Type I local strength.
25、After testing in accordance with 4.6.1.2 there shall be no signs of permanent deformation or visual damage. , 3.4.2 Slip-resistant properties. When tested as specified in 4.6.2, the slip-resistance factor measured after 50,000 strokes shall be not less than the c following values: 1.50 in the dry co
26、ndition, 1.25 in the wet condition, and 1.00 in the oily condition. testing) and final slip-resistance factor for each condition shall not exceed 0.75. Maximum differential between initial (before wear V 3.4.3 Resistance to wear. Wear shall not exceed 0.010 inch after th9 first 10,000 strokes of the
27、 wear pads in accordance with MIL-STD-2151. additional wear, resulting from strokes of 20,001 through 50,000, shall not exceed 0.008 inch. Total Testing for wear resistance shall be as specified in 4.6,3. 3.4.4 Resistance to impact. When tested as specifiedin 4-6.5,. the tread shall not exhibit dete
28、rioration or loss of the iller material deeper than 0.150 inch, cracks between impact points or projecting more than 0.50 inch away from the centers of impact, loosening or separation from the aluminum extrusion, nor shall any other area of the tread, not previously subjected tQ impact testing, show
29、 any signs of deterioration as a result of the test. 3.4.5 Fire resistance. When tested as specified in 4.6.6 the tread specimen filler shall not exhibit destruction or deterioration, with the o exception of color change. 4.0 minutes. The density of smoke shall be light. The combustion plus ignition
30、 time shall not exceed 3.5 Labeling. Each tread shall be stenciled on the underside with the following: (a) Manufacturers name. (b) Nanufacturers address. (c) Year and month of manufacture, (d) National stock number (if applicable). (e) Type of tread and number of this specification. 4. QUALITY -ASS
31、URANCE PROVISIONS 4.1 Kesponsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible For the performance of all inspection requirements ils specified herein. fied in the contract or purchase order, the contractor may use his own or any othe
32、r facilities suitable for the perforniance of the inspection requirements Specified herein, unless disapproved by the Government. The Goveynment reserves the right to perform any of the inspections set fortti in the specification where such inspections are deemed necessary to assure supplies and ser
33、vices coiif orin to prescribed requirements. Except as otherwise sped+ 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2qb3LI 20 m 4777706 0373206 2 m -. No. of Requirement specimens pargaraph 4.2 Classification of inspection. The inspection
34、requirements for tread samples and filler material specimens cut from a tread sample shall be classified as follows: Test paragraph (a) First article inspection (see 4.3). (b) Quality conformance inspection (see 4.4). 1 1 4.3 First article inspection. First article inspection shall be performed when
35、 required (see 3.1). and tests of 4.6. The contractor shall prepare a test report in accordance with the data ordering document included in the contract or order (see 6.2.2). This inspection shall include the examination of 4.5 4.3.1 First article test specimens. The number of test specimens require
36、d The tread selected for prepara- for each testshall be as specified in table I. tion of the fire test specimen (see 4.6.6) shall also be used for examination of dimensions, shape and toLerance of the extrusion (see 3.3 and 4.5). 3.3.3 4.6.4 3.4.4 4.6.5 3.4.5 4.6.6 TABLE I. Sg_ecimen and test requir
37、ements. Perormance char ac t e r i s t i c Strength (type I and IA only) Slip-res is tance Wear-resis tance Nois ture and temperature Impact resistance Fire resistance resistance I 1 3.4.1 3.4.2 3.4.3 4.6.1 4.6.2 4.6.3 4.4 Quality conformance inspection. Quality conformance inspection shall be perfo
38、rmed on the treads selected in accordance with 4.4.2. shall be as speciEied in the examination of 4.5, tests of 4.6.4, 4.6.5 and 4.6.6, and the inspection of 4.7. This inspection .4.4.1 Inspection lot. Treads of the same type and width offered to the Government at on? time shall be considered a lot
39、for the purpose of inspection. 4.4.2 Sampling. Random samples of treads shall be selected from each lot in accordance with MIL-STD-105. 4.4.2.1 Sampling for examination. Examination of treads shall be based - on inspection level 11, and an acceptance quality level (AQL) of 1.5 for major defects per
40、hundred treads and 4.0 for iuiiior defects per hundred treads. 4.4.2.2 Sampling for tests. Sampling or tests shall consist of two sample groups, Group A and Group B. Group A shall be based on inspection level S-1, AQL 1.5 percent defective and shall be tested in accordance with 4.6.4 and 4.6.5. Grou
41、p B shall be based on inspection level S-1, AQL 1.5 percent defective and shall be tested in accordance with 46.6 and the dimensional examination of 4.5. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24634 20 9999906 0193207 Y MIL7T-24634(
42、SH) 4;5 Examination. Each sample selected, as specified in 4.4.2.1, shall. be examined for defects specified in table II. of the extrusion shall be conducted only on the specimen prepared or Eire testing (see 4.4.2.2 and 4.6.6). Dimensions and tolerance exainiiiation TABLE II. Classification of defe
43、cts, Construction Base Filler Harking Requirements Material not as specified. Type not as specified. Length or width not as specified. Dimensions or shape of extrustion (see 4.3.2) Mounting holes location and size not as Welding not as specified, Outside surfaces not free of corrosioii, not as speci
44、fied or within tolerance. specified. scratches, roughness, blemishes, dirt 1: other extraneous material. Material not as specified. Cracks, loose material or incliisioiis Color not as specified or iionuniEorin. Sealant not as specified. Height and overlap not as specified. Nonuniform surface or edge
45、s. of foreign material. ,I Missing or incomplete. 4.6 Tests. 4.6.1 Strength tests. I_ Class if ication P Major Ma j or Major Ma j or Ma j or Ma j or Ninor Major Ma j or Minor Minor Minor Minor Minor 4.6.1.1 Deflection test. A type I or type IA tread specimen of the longest length ordered shall be bo
46、lted to or supported by rigid end supports. A 300- pound concentrated load shall be applied to the center of the tread, distributed over an area 3-1/2 inches wide by the width of the tread, After 10 ininutes the deflection at the center of the tread shall be measured. After removal of the load the t
47、read chal1 be inspected or permanent deformation. 4.6,1.2 Local load test. The type I ar type IA tread specimen which was tested in 4.6.1.1 shall be tested by the application OE a 200-pourid load con- centrated on a 1/2-inch square area. locations and held for 1 ivinute each. Each location shall be
48、inspecred for permanent deformation ar visual dainage aEter removal. of the Loads. The load shall he applied at: six difEereiit 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2qb34 20 99799Ob 0193208 b . i 4.6.2 Slip-resistant properties (sl
49、ip-resistance factor). The slip-resis- tance factor shall be determined for the tread sample selected as specified in 3.1 using methods and equipment in accordance with proposed MIL-STD-2151. The initial slip-resistance factor shall be measured before the wear test specified in 4.6.3 and the final slip-resistance factor measured after 50,000 strokes. Measurements shall be made three times for each of the dry, wet, and oily conditions and the av
