1、- MIL-F-Lt3573A 53 I 3999906 0422892 B MIL-F-43573A (GL) 28 June 1968 SUPERSEDING MIL-F-43573(GL) 29 February 1968 MILITARY SPECIFICATION FASTENERS, SNAP, PLASTIC 1. SCOPE 1.1 Scope.- This specification covers requirements for two types of plastic snap fasteners (see 6.1). 1.2 Classification.- Snap
2、fasteners shall be of the following types, as specified (see 6.2) . Type I - Two-piece snap fastener (stud-eyelet and socket). Type II - Four-piece snap fastener (stud and eyelet and socket and eyelet). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation
3、for bids or request for proposal, form a part of this specification to the extent specified herein: SPECIFICATIONS FEDERAL L-P-392 - MILITARY MIL-H-3982 - MIL-P-22748 - STANDARDS MILITARY MIL-STD-105 - Plastic Molding Material, Acetal, Injection and Extrusion. - - Hardware (Fasteners and Related 1te
4、ms)Packaging and Packing or Shipment and Storage Of. Plastic, Polyethylene and Copolymers, High Density, Molding and Extrusion Material. Sampling Procedures and Tables for Inspection by Attributes. FSC 5325 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
5、-,-,-MIL-F-Y3573A 53 qq77qCIb OY2293 T MIL-F-45573A (GL) DRAWINGS U, C. ARMY NATICK LABORATORTES 8-2-191 - Pastenere, Snap Plastic, Assembly and Details (Type 1). 8-2-261 - Fasteners, Snap Plastic, Assembly and Details (Type I), (Copiee of specifications, etandards, drawinge arid publications requir
6、ed by suppliere in connection with specific procurement functions ehould be ob-. tained from the procuring activity or as directed by the contracting officer) 3, RKQUIRaMaNTS 3.1 First article, When specified (see 6.21, before quantity production ia commenced, finished samples of the componente nece
7、ssary to assemble six complete fasteners shall be submitted or made ready or approval of the con- tracting officer or his authorized representative for inspection ae specified in 4.2 to determine compliance with this-specification, The approval of the preproduction sample authorizes the commencement
8、 of production but does noe relieve the supplier of responsibility for compliance with all applicable pruvisions o this specification, 3*2 Materiels.- 3*2,1 polding cornPound,- 3,2,1,1 Polyethylene, material,- The compound used in molding the stud and sacket postion of the type II snap fastener shal
9、l be a virgiii high density polyethylene conforming to clam CI grade 2 of Mft-P-22748 except th&t the requirements for them1 streee cracking reeietance, dielectric constant and dissipation factor shell noG apply, Clean, unburned plaetic material in the form of imperfect parts, Bptues, runners or oth
10、er scraps of the saute composi- tion, produced in the molding or finishing operation may be reground and mixed with thenvirgin material, 3.2.1.2 Acetal material.- Ehe compound used in molding the stud-eyelet and socket portion of the type I ewp fastener or the eyelet of the type II enap faeeener sha
11、ll be a virgin acetalmolding material conformiag to type I, claes 2 of L-P-392, except that the electrical property requirement8 shaU not apply. Clean, unburned plastic material in the form of imperPect partaI eprues, cunners or other scrape of the same composition, produced in the molding or finish
12、ing operation may be reground and mixed with the virgin material. 3.3 Ieeign and construction,- - The type I enap faetener shall. coneist of a female por- 8 male portion (stud-eyelet), The typa 11 snap fastener shall coneiet: of a female portion (eyelet and socket) and a male portion 2 Provided by I
13、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- _ L MIL-F-43573A 53 e 9999906 0422894 1 MIL-F-43573A (GL) (eyelet and stud). complete fasteners shall be furnished and all components shall be of one manufacturers construction only. Unless otherwise specified (see
14、 6.2),components for 3.3.2 Construction.- The snap fastener shall be made as specified herein and in accordance with the details in Drawings 8-2-261 or 8-2-191, (as applicable). 3.4 Performance.- 3.4.1 Strength of setting pinch or clinch.- The type I fastener (stud- eyelet and socket), when assemble
15、d or clinched together shall not separate when subjected to a minimum pull strength of 50 pounds when tested as speci- fied in 4.3.3. The type II fastener (eyelet and socket and eyelet and stud) when assembled or clinched together shall not separate when subjected to a minimum pull strength of 35 po
16、unds when tested as specified in 4.3.3. 3.4.2 Function.- The snap fastener shall function as intended when tested as specified in 4.3.3. 3.5 Instructions for use.- snap fasteners to end use articles. facturers recommendation for attaching the snap fasteners as well as tools required for attaching th
17、e snap fastener, (e. g. chuck, hand punch, die, or special equipment). The supplier shall furnish data for attaching Assembly data shall include the manu- 3.6 Marking or identification.- At least one component part (socket, stud- eyelet, or stud) of each complete fastener shall bear the manufacturer
18、s identification either by name, trade name, or trade mark. Identification marking shall be permanent and shall not affect the working or snapping on and off characteristics of the fastener. The size of the letter shall be approxi- mately 1/16 inch high. and the characters shall be raised approximat
19、ely 0.007 inch. The marking shall be accomplished by a molded-in process 3.7 Workmansh1p.- The components shall be clean, smooth and free from cracks, dirt or flash and shall conform to the established quality provisions of this specification and the occurrence of defects shall not exceed the applic
20、able acceptable quality levels (AQLs) in Section 4. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection.- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. specified in the c
21、ontract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements speci- fied herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such i
22、nspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as otherwise 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-43573A (GL) 4 . 1.1 Certificate of compliance,- Where certificates of comp
23、liance are submitted, the Goverment reeerves the right to check test euch items to determine the validity of the certification, 4.2 Piret article ineoectionc- When apecified (see 6.21, eamples eub- mitred in accordance with 3,l shall be inspected for all, provieions of this specification applicable
24、to end product examination and testis. with Hit-STD-105, except where otheruiee indicated hereinafter. componente and materials shall be inspected and tested in accordance with a11 the requirements af ref erericed specications and etandards unlese other- wise excluded, mended, modified or qualified
25、in this specification or applic- able purchaae docmeate, The composition of the polyethylene 01: acetal mold- ing material speciried in 3.2.1.1 and 3,2,1.2 may be accepted on the basis of the suppliers certificate of compliance, 4.3.2 Inspection of the end item.- 4.j.2.1 Visual examination.- Examina
26、tion of the end item shall be ia 4.3 1aepection.- Sampling for inspection shall be performed in accordance 4.3 . 1 Component and material inspection. - n accordance with 4 . 1 akve, accordance w5th the defects and acceptable quality levels (AQLs) eat forth ia 4.3.2,3. Por purposes of sampling, all s
27、nap kstenere of the ame type and composition, offered for iaspection at: one time shall be considered a lot, The sample unir shall be one complete snap faatener, Defect: Not as specified. 1 Examine 1_1 fleeign and construction Marking Whntwhip Missing. Not as specified, Not clean, Cracked. Contains
28、dirt, Contains f lash , Not 8mOOthe Asrrmbly data and attaching Missing, incomplete or not as toole specified. 4.3.2.2 Dimensional examination,- Xnepectm shall be made of snap faatenere to detemine compliance with dimensions of snap fastenere specified, Any dimeneion not: within specified tolerances
29、 shall be claseified sa a defect. I 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-LI3573A 53 El 7777706 0422876 5 mL-F-43573A (GL) 4.3.2.3 Inspection levels and acceptable quality levels (AQLs) for examination.- The inspection levels for de
30、termining sample size and the acceptable quality levels (AQLs) expressed in defects per 100 units shall be as follows: Examination paragraph Inspection level -9L 4.3.2.1 s-1 1.5 4.3.2.2 s-2 4.0 4.3.3 Testing of the end item.- The completely fabricated snap fastener parts shall be tested for the char
31、acteristics listed in table I. The test requirements shall be applicable to the individual unit. sampling, all snap fasteners offered for inspection at one time shall con- stitute a lot. fasteners. failure of any sample unit to meet the requirement specified. For purposes of The sample unit shall be
32、 two completely fabricated snap The sample size shall be ten. There shall be no evidence of TABLE I.- End item testing Require- Number deter- Results ment Test minations reported Characteristic paragraph method per sample unit as Strength of 3.4.1 4.4.1 setting Function of 3.4.2 4.4.2 assembled fast
33、ener 1 Pass or fail 4 Pass or fail 4.3.4 Examination of Preparation for delivery requirements.- An examina- tion shall be made in accordance with the provisions of MIL-li-3982 to deter- mine compliance with the packing, packaging and marking requirements of Section 5 of this specification. 4.4 Tests
34、.- 4.4.1 4.4.1.1 For Type I fasteners (between stud-eyelet and socket).- The stud- The brass strips shall be pre- Both ends of the brass strips shall Determination of Strength of Setting Pinch (Clinch),- eyelet and socket shall be attached to two pieces of brass strip stock (each strip 0.010 inch th
35、ick) as shown in figure 1. punched before assembling the two parts. be clamped in separate jaws of a tensile testing machine. the jaws shall be 4 inches. minute. Distance between The speed of jaw separation shall be 12 inches per Determinations shall be made for compliance to 3.4.1. 5 Provided by IH
36、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HXL-F-43575A (GL) 4,Q,1,2 For Tupe II fasteners (between eyelet and stud and eyelet and socket),- The eyelet: and stud (male half) and eyelet and socket (female half) shall each be attached to two 64mh piecee of fabr
37、ic as shown in figura 2, The fabric shall be pre-punched before aesemblng the snape, Both ends of each piece of fabric per combination shall be clamped in separate jaws of tensile teeting machine, The distance between jaws shell be 4 inches, The speed of jaw separation shall be 12 inches per Idinute
38、V The thichess of the fabric used in the teer. shall be between ,020 and ,035 inch, Determination ahall be made for compliance to 3,4,1, 4.42 Function testr- The male and female half of the fastener under teet ahall each be aesembled to the fabric to be used in accordance with the manufacturere recm
39、endatioa or aeaeabling, The male and femele half shall be manually snapped together and shell readily anap and unsnap at the point or periphery normally used when opening and closing, The fastener shall be manually operated as titated not: less than 4 tines to determine compliance with 314,Ze 5, PRE
40、PARATION FOR DEtXVERY 5.1, Packaging,- Packaging shall be level A or C ae specified (see 6.2). 5.1,l Levels A and Ca- Faetenera ahall be packaged in accordance with the 5,2 Packiag,- Packing shall be level Al B 81: C a specified (Bee 6,P). 5,2,1 Levels A, B, and C.- Feetenere shall be packed in acco
41、rdance with spplicebfii requirements of MIL-H-3982, MIL-B-3982, 5,3 Marking,- In addition to any special marking required by the contract or order, shipment: shall be marked in accordance with MIL-H-3982. 6r NOTES 6,l Intended use,- The typa Z enap fasteners are intended for use on ponchos sad shelt
42、er halves, The compressed thickness of foundation or fabric wich can be used wfth theee fastenere ehould not be lese than 0,010 inch or more than 0,030 iuch, If coneideretion is given to a fabric: thicheee outaide the above ranga it ehould be thoroughly evaluated with this snag fastener da- aigu bef
43、ore adoptionl The type If enap fastenere are intended for use on equipage item8 euch as entrenching tool covers, tropical. rucksack carriers, grenade caeea and mall arms ammuaitian cases, The compressed thicknees of foundation or fabric which can be used with these fasteners should not be leea than
44、0,030 inch or more than 0.156 inch, In the mualler thickneeeae, only nylon fabric ia recomneuded with thie snap fastener, given to e fabrie thickness outeide the above rang4 it should be thoxoughly evaluated wth thie edap fastener deeiga before adoption, If coneideration is c 6 Provided by IHSNot fo
45、r ResaleNo reproduction or networking permitted without license from IHS-,-,-% MIL-F-43573A 53 SB 777770b 0422878 7 MIL-F43573A (GL) k 6.2 Ordering data.- Procurement documents should specify the following: a. b. Type fastener required (see 1.2). c. First article.- When preproduction sample is requi
46、red (see 3.1). d. Whether separate fastener component parts are required or whether Title, number and date of this specification. fastener components from different manufacturers are required (see 3.3.1). 5.1.1 and 5.2.1). e. Selection of applicable levels of packaging and packing (see Custodian: Pr
47、eparing activity : Amy - GL Review activities: Army - GL, ME User activities: Army - AT, EL, MI, Mu Army - GL Project No, 5325-AO01 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-43573A (GL) t 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-q3573A 53 m 797970b 0422900 3 m I / MIL-F-43573A (GL) I F!zzSl ET III -6”- Of FABRIC, I Of FABRIC THICK I L I 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
