1、GGG-H-575 51 7777774 004454b 5 /- yb-33-21 - GGGH-575 November 10, 1960 SUPERSEDING January 12, 1962 MIL-H-795A FEDERAL SPECIFICATION HOLDERS; SHEET METAL, HOLE AND EDGE GRIP This specif2caton was approved by the Commksimer, Federal Supply Serv- ice, General Services Adm.inZstraton, for the use of a
2、ll Federal agencies. 1. SCOPE AND CLASSIFICATIUN 1.1 Scope. This specification covers sheet- metal holders for clamping sheets in place during fabrication. 1.1.1 Federal specfcation coverage. Fed- eral specifications do not include all varie- ties of the commodity as indicated by the title of the sp
3、ecification, or which are com- mercially available, but are intended to cov- er those generally used by the Federal Gov- ernment. 1.2 Classification. Federal Specifcation: GGG-F-570-Forceps, Sheet Holder. Federal Standard: Fed. Std. No. 123-Marking for Domes- tic Shipment (Civilian Agencies). . (Act
4、ivities outside the Federal Government may obtain copies of Federal Specifications, Standards, and Handbooks as outlined under General Informa- tion in the Index of Federal Specifications and Standards and at the prices indicated in the Index. The Index, which includes cumulative monthly sup- plemen
5、ts as issued, is for sale on a subscription basis by the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402. (Single copies of this specification and other 121 czasses and Sheet- product specifications required by activities outside the Federal Government for bidd
6、ing purposes are types, Classes and sizes, 88 specified (see available without charge at the General Services 6.2) : Administration Regional Offices in Boston, New be .Of the Type I-Hole grip. Class 2-Forcps-operated, styes A, D, and E (fig. i). Size-As listed in table II. Type II-Edge grip. Class l
7、-Lever-operated (fig. 2). Size-As listed in table III. Class LForceps-operated (fig. 3). Size-As listed in table IV. Type III-Hob grip. Class 4-Hand-operated-screw me, styles G, H, and J (fig. 4). Size-As listed in table V. 2. APPLICABLE DOCUMENTS York, Washington, D. C., Atlanta, Chicago, Kansas Ci
8、ty, Mo., Dallas, Denver, San Francisco, Los Angeles, and Seattle, Wash. (Federal Government activities may obtain copies of Federal Specifications, Standards, and Hand- books and the Index of Federal Specifications and Standards from established distribution points in their agencies.) Mlitarzj Speci
9、fication: MIL-H-1542AHand Tools ; Packaging of. Militarg Standards: MIL-STD-105-Sampling Procedures and Tables for Inspection by At- tributes. MIL-STD-129-Marking for Shipment and Storage. 2.1 The folllowing specifications and stand- ards, of the issues in effect on date of invi- tation for bids Or
10、request for form a part Of this specification to the extent specified herein : officer.) (Copies of Military Specifications and Standards required by contractow in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting THIS DOC
11、UNENT CONTAINS 7 -.- PAGES. ht FSC 5120 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GGG-8-575 i 3: REQUIREMENTS 3.1 Illustrations. The illustrations shown herein are for the convenience of identifi- cation and are not intended to preclude the pur
12、chase of holders which are otherwise in accordance with the requirements of this specification. 3.2 Materials. Materials shall be as spec- ified herein. Materials. not definitely spec- ified shall be of the best quality used for this purpose in commercial practice. 3.3 Design and, construction. Shee
13、t hold- ers covered by this specification shall be of the sprng,tension type. Type I, hole-grip holders, shall have two moving prongs op- .erating with a fixed pin in such a manner ithat the prongs are expanded by spring ten- sion in order to insure proper alignment, When the holder is inserted into
14、 corres- ponding holes in two or more sheets, the .sheets shall be held together securely. The type II, edge-grip holder, shall have two parallel jaws which clamp the edges of the sheets together by means of spring ten- ,sion. The type III, hole grip, shall be a ,hand-operated wingnut, all purpose f
15、asten- er for use with heavier materials where more pressure- is required. 3.4 Springs. The springs shall be of good ;quality steel and properly heat treated to mithstand the impofied loads. The force ex- erted by the spring shall be as specified in table I. .I 3.5 Safety. The sheet holders shall be
16、 so constructed that they will not spring apart with force and cause injury to operator due to possible failure of any part of holder. 3.5.1 Swaging. The method of a swaging . operation in the final assembly of type I, class 2 forceps-operated holder, shall be of such construction that constant use
17、of the sheet holder shall not allow the swaged part to cut through the spring-retaining cup during normal usage and allow disassem- bly of the sheet holder. Holders shall meet saDety test requirements of 4.4.3. 3.6 Marking. Unless otherwise specified, each holder shall be permanently and legi- bly m
18、arked with the manufacturers name or trademark. 3.7 Finish. The finish shall be as specified in tables II through V. 3.8 Inteiichangeability. All parts having the same manufacturers part number shall be directly and completely interchangeable with each other with respect to installation and perf orm
19、ance. 3.9 Type I, hole-grip sheet holder. Type Y, hold-grip sheet holders, shall be of the spring-tension, fully enclosed safety type. 3.9.1 Class 2, forceps-operated. The class 2, hole-grip sheet holder, shall be so con- structed that it is capable of being operat- ed by means of forceps conforming
20、 to GGG- F-570. The holder shall be substantially as shown on figure 1, and shall comply with the requirements of table II. The style of hold- er to be furnished shall be at the option of the contractor. Holders shall be furnished with either a O to 1/4 or O to 112 inch mate- rial-holding capacity a
21、s specified (see 6.2). TABLE I. Requirement for sliririg tendm Class 2 2 .2 2 - ThickneM Clamping force Style I material clamped Inch A, D 1/4 E- 1/2 1/2 3/4 (min.) Pound 50 . 60 60 .60 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GGG-H-575 -I”t
22、- STYLE A STYLE D STYLE E FIGURE 1. Type I, class 2, hole grip forceps- operated. -# Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i_ _-_I_ GGG-H-575 51 9999974 0044549 O W TABLE II. Detail requirements for type I, ch ss 2, hole grip, forceps-opera
23、ted Nomina rivet size Inch 1/16 3/32 1/8 6/32 3/16 7/32 1/4 9/32 11/32 Hole size oversize (max,: Znck,-lli%Che6 1.062 to 0.078 2-118 .O93 to .108, 2-118 ,126 to .140 2-118 .166 to .171 2-118 ,187 to ,203 2-1/8 ,218 to ,230 2-1/4 .250 to ,265 2-1/4 .281 ,343 standard to A - - B :max.) ncit: 0.410 .41
24、0 .419. .410- ,410 .410 ,410 ,626 .626 C (min.) Inch- 6/16 6/16 6/16 6/16 6/16 5/16 6/16 6/16 - . D (rnax.) Inch 16/16 16/16 16/16 16/16 16/16 16/16 16/16 13/16 13/16 Dimensions -E- (max.) Inche 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 -. . - Finish, (max.) color Znch 1/4 .Black U4 Cadmium 1/4 .Copper 1/
25、4 Black 1/4 Brass 1/4 .Cadmium 1/4 copper 5/16 Brass 5/16 Brass -_- FI G (max.) Zncn. _- 1-6/8 1-6/8 1-6/8 1-6/8 1-5/8 . . . . - H (rnax.) Inch - . 2-7/8 2-7/8 2-7/8 2-7/8 2-7/8 2-7/8 . . * J (max.) Inch 348 348 348 3-/8 348 348 3-/8 . . 3.10 !Cype II, edge-grip sheet holder. ly as shown on figure 2
26、, and shall comply with the -applicable requirements of table 3.10.1 Class 1, lever-operated. The class 1, edge-grip sheet holder, shall be operated by means of a hand lever which is a part of the holder. The holder shall be substantial- IIIThe gripping surface of the jaws shall be made of rubber Or
27、 asbestos as specified (see 6.2). -*- SIZE 3/8 SIZE 118 . . . %. ,. ._ , . _i ._ -. . FIGURE 2. Type II, .class: 1, edge grip, lever- operated. TABLE III. Detail requirements for type 11, class 1, edge grip, lever-operated -.-_- Dimensions Finish, Jaw opening range Size Inch Z%h Inches Isrches Inche
28、s 1/8 O to 6/32 2 2 3/4 Cadmium 3/8 1/8 to 3/8 3-3/4 3-3/4 1-1/2 Cadmium A B c color - - _- - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-l- A i May be Either Enclosed Spring or Exgosed Spring Design II -2p tZ?x3- FIGURE 3, Type II, class 2, ed
29、ge grip, forceps- operated. TABLE IV. Detail requirements for type II, class 2, edge grp, forceps-operated Finish Dimensions B D Jaw opening range Inch o-1/2 e3/4 Adjustable from O to 7/8 - Inches IncA 2-9/16 .4 10 3 ,410 2-5/16 0.410 Inch 6/16 6/16 6/16 - inch ?Inch- 1 I 3/8 1 1 3/8 1 3.10.2 Class
30、2, Forceps-operated. The class 2, edge-grip sheet holder, shall be ca- pable of being operated by means of forceps conforming to GGG-F-570. The holder shall be substantially as shown on figure 3, and shall comply with the requirements of ta- ble IV. Copper or black Brass or black- Copper or. blaqk 3
31、.11 Type III, hole-grip sheet holder. 3.11.1 Class 4, hand-operated screw type. The class 4, hole-grip sheet holder, shall be so constructed that it is capable of being operated by means of a wingnut. The hold- er shall be substantially as shown in figure 4, and shall comply with the requirements of
32、 table V. - . . . .t . . -. ,-. . . .? . . . . - . . . .? Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 t =HEX 9 F STYLE 1-B VYLE J FIGURE 4. Type III, class 4, hole grip, hand- operated, screw type. Provided by IHSNot for ResaleNo reproduction o
33、r networking permitted without license from IHS-,-,-GGG-H-575 51 = 7777774 0044552 O W c TABLE V. Detail requirements for type III, class 4, hole grip, hand-operated Nominal I Hole size Dimensions in inches (max) (max.) -(mZ) - 3/32 0.093to 0.108 2-1/2 3-1/8 4W8- 1-11 1/8 ,126 to -140 1. 1 i 1 1 1 1
34、 1 , 1 Black Copper 6/32 ,156 to .171 3/16 .187to ,202 Brass 7/32 .218 to ,230 Cadmium 1/4 250to ,265 V v v v v v 7 1 v Copper 5/16 .312 2-1/2 3-1/8 4-6/8 1-17/32 1-7/8 2-7/8 5/16 1/2 1 Black 3.12 Workmanship. The holders shall be mensional characteristics in accordance with free from defects which
35、adversely affect MIL-STD-105 at inspection level I. The ac- their appearance or which may affect their ceptable quality level (AQL) shall be 1.0 D serviceability. percent defective for major defects and 2.5 I percent defective for minor defects. 4. QUALITY ASSURANCE PROVI- SIONS 4.1 Unless otherwise
36、 specified in the con- tract or purchase order, the supplier is re- sponsible for the performance of all inspec- tion requirements as specified herein. Ex- cept as otherwise specified, the supplier may utilize his own or any other inspection facilities and services acceptable to the Gov- ernment. Th
37、e Government reserves the right to perform any of the inspections set forth in the specification where such inspec- tions are deemed necessary to assure that supplies and services conf om to prescribed requirements. O 4.2 Samding for lot acceDtance. 4.2.3 Sampling for lot acceptance tests. A random
38、sample of sheet holders shall be taken from each lot in accordance with MIE STD-105 at inspection level S-3. The AQL shall be 1.0 percent defective. Each of the sample sheet holders shall be tested in ac- cordance with 4.4.1, 4.4.2, and 4.4.3, as ap- plicable, to verify conformance with this specifi
39、cation, 4.3 Examination. 4.3.1 Visual and dimensional examination. Each of the sample sheet holders taken in accordance with 4.2.2 shall be visually and dimensionally examined to determine con- - formance with this specification. Examina- - considered a containing one or more visual or dimension- be
40、r of defective holders in any sample ex- 43.1 InSPeCtiOn lot. All sheet holders Of tion shall be conducted as specified in ta- the same and size Offered for ble VI. Any sheet holders in the sample delivery at one time shall be and tests. lot for purposes Of examination, al defech be rejected, and if
41、 the num- 4.2.2 Sampling for examination. A random sample of sheet holders shall be taken from each lot for examination of visual and di- ceeds the acceptance number for that sam- ple, the lot represented by the sample shall be rejected. Provided by IHSNot for ResaleNo reproduction or networking per
42、mitted without license from IHS-,-,-GGG-H-575 :Lj TABLE VICEctssfcatinof defects for vzszcal spring. pressure required to remove tha and dimensional examinution , - Categories Defects Critical: 1 : . . . , , None defined. Major : 101 , . . , Type, class, and size not as,speci- 102 . . . . . . . . In
43、complete, component parts miss- ing or improperly assembled. 103 . . . . . . . . Materials not as specified. 104 . . Color code improper for size speci- 105 . . . , . . . Dimensions not in accordance with 106 . Gripping range not as specified. 107 Gripping surface of jaw of im- proper material (type
44、 II, class 1 only). .L fied. -1 . fied or color missing. the applicable table and figure. Minor: 201 . . . . , . . . Marking, manufacturers name or trademark missing, incorrect, il- legible, or not permanent. 4.4 Tests. 4.4.1 Spring tensioow test. The sheet hol- er shall be tested to determine compl
45、iance with the clamping force requirements spec- ified in table I. 4.4.2 Holding test. 4.4.2.1 Hole-grip holders. The hole-grip types of sheet holders shall be tested for holding quality by inserting the holders in- to holes provided in sheet metal. The size of holes shall be the largest hole specif
46、ied in table II for the holder being tested. With the holders inserted in the holes, they shall not come loose or fall out when struck a light blow with the hand at a sidewise pu- sition. .4.4.2.2 Edge-grip holders. The edge grip of sheet holders shall be tested for holding quality by clamping two p
47、ieces of metal 0.064 inch thick. A spring-pressure pull shall be applied to each holder in the same plane as that of the metal which is being held. The holder shall be not less than 10 pounds. , - _. . , 4.4.3 Safetu test for typeI, class 2 ho- drs. The points- of - each holder selected for test sha
48、ll be projected though a hole in a sheet of metai 3/16 ihch thick andthen hela securely between the cpttirig jaws of a plier or nipper. With the holder in the clamped position, pressure shall be applied to the handles of the plier or nipper until the points are severed. Theholder shall not fly away
49、with a force that would injure the operator in any way and the holder shall remain in- tact. 4.4.4 Possible test faiiures. Possible test failures are defined as follows: 1. Spring-tension test: (a) Failure of springs to comply with requirements. 2. Holding test: (a) Sheet holders fail to hold properly when tested as spec- ified. 3. Safety test (type I, class 2 only): (a) Holder flies awa
