1、I 1 a *- - MIL-P-27235A 53 W 999770b 0305779 5 MIL-P-27235A 27 November i968 SVP-ERSEDTNG MIL-P-27235 i5 June 1959 MILITARY SPECIFICATION PINS, STRAIGHT, HEADED (CLEVIS PINS) This specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. Thi
2、s specification covers solid, metal, cylindricamaded straight pins, which are commonly referred to as clevis pins (see 6.1). 1.2 Classification. Clevis pins shall be of the follow- ing types and sizes, as specified (see 6.2). 1.2.1 Types. Type I - Carbon steel Type II - Corrosion-resisting steel Typ
3、e III - Brass 1.2.2 Sizes. Sizes shall be in accordance with MS35810. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPECIFICATIONS Federal QQ-B-626 -
4、Brass, Leaded and Non-Leaded: sod, Shapes, Forgings and Flat Products with Finished Edges (Bar, Flat dire and Strip) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-QQ-P-35 - Passivation Treatments for Austenitic, Ferritic Q$-P-416 - Plating, Cadmium
5、 (Electrodeposited) QQ-2-325 - Zinc Coating, Electrodeposited, Requirements and Martensitic Corrosion-Resisting Steel (Fastening Devices) for Military MIL-W-3982 - Hardware (Fasteners and Related Items), Packaging and Packing for Shipment and Storage of STANDARDS Federal Ped, Std. No. 66 - Steel: Ch
6、emical Composition and Ped. Test Method Std, No. i5i - Metals: Test Methods Hardenability Military MIL-STD-105 - Sampling Procedures and Tables for Inspection MIL-STD-109 - Quality Assurance Terms and Definitions MIL-STD-129 - Marking for Shipment and Storage Ms35810 - Pin, Straight, Headed (Clevis
7、Pin) Steel, Cadmium or Zinc Plated by Attributes (Copies of specifications, standards, drawings and pub- 1Lcationa required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer,) 2.2 Other publications
8、, The following documents form a part of %his specification.to the extent specified herein, Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply, American Society for Testing and Materials ASTM E18 - Methods of Test for Rockwell Hardness
9、and Rockwell Superficial Hardness of Metallic Materfals I (Application for copies should be addressed to American Society for Tes,ting and Materials, 1916 Race St., Philadelphia, Pa. 19103,) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-27235
10、A 53 7779706 0105781 3 MIL-P-27235A 3. REQUIREMENTS 3.1 Material. Clevis pins shall he manufactured from 3.1.1 Carbon steel. Type I clevis pins shall be SAE the following materials, as specified (see 6 2). 1010, 1111 or equivalent in accordance with FED. STD. NO. 66. These steels shall have a minimu
11、m ultimate shear strength of 41,000 p.s.i. fied (see 6.2j, type i clevis pins shall be AIS1 416 or 430F in accordance with FED. STD. NO. 66. These steels shall have a minimum ultimate shear strength of 67,000 p.s.i, 3.1.3 Brass. Unless otherwise specified (see 6.2), type III clevis pins shall be Com
12、position 21 or 22 in accor- dance with QQ-B-626, and shall have a minimum ult-imate shear strength of 40,000 p.s.i. 3.1.2 Corrosion-resisting steel, Unless otherwise speci- 3.2 Hardness. 3.2.1 Type I. 3.2.2 Types II and III. Unless otherwise specified Type I clevis pins shall be cyanide hardened to
13、Rockwell- minimum to a depth of .O05 inch minimum. (see 6,2), Types II and III clevis pins shall not be heat- treated. 3.3 Protective finish. 3.3.1 Type I. Type I clevis pins shall be cadmium plated or zinc coat- specified (see 6.2). 3.3.1.1 Cadmium plating. Cadmium plating shall be in accordance wi
14、%h type II, class 3 of QQ-P-416. 3.3.1.2 Zinc coating. Zinc coating shall be in accor- dance with type 11, class 3 of QQ-2-325. 3.3.2 Type II. Unless otherwise specified (see 6.2), type II clevis pins shall be passivated in accordance with QQ-P-35 6 3.3.3 Type III. Type III clevis pins shall be unco
15、ated. 3.4 Shear. The shear strength of clevis pins shall be not lessn the minimum shear strength values specified in 3.1 or MS35810, as applicable. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - MIL-P-27235A 53 M 977770b 0305782 5 W MIL-P-2723
16、5A 3.5 Design and dimensions, Unless otherwise specified (see 6,2), the design and dimensions of clevis pins shall be in accordance with MS35810, Unless otherwise specified, dimensions and tolerances shall apply after plating or coat- ing * to the pins, provided they do not interfere with dimensions
17、 or the intended use of the pins, 3.6 Markin$. Trade marks or other markings may be applied 3.7 Workmanship. Clevis pins shall be smooth, free from burrs, sharp edges, gouges, porosity, cracks, scale, dirt or other defects which may adversely affect their intended use , 4* QUALITY ASSURANCE PROVISIO
18、NS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection require- ments as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other
19、facilities suitable for the performance of the inspec- tion requirements specified herein, unless disapproved by the Government, The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and servi
20、ces conform to prescribed requirements, 4.1,l Quality assurance terms and definitions, Quality assurance terms and definitions used herein are in accordance &th MIL-STD-109. 4.2 Inspection provisions. 4.2,1 c_ Lot, A lot shall consist of clevis pins of the same type, finish and size, manufactured fr
21、om the same heat under the same conditions and offered for acceptance at one time . 4,2,2 Sampling. 4.2.2.1 Sampling for examination. A random sample of pins shall be selected from each lot in accordance with Inspection Level II of MIL-STD-105, using the Acceptable Quality Levels (Ams) specified in
22、Table I. 4.2.2.2 Sampling for test, A random sample of pins shall be selected from each 105 in accordance with Inspection Level S-1 of MIL-STD-105, using an AQL of 0.65, 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-27235A 53 = 7777906 0105
23、783 7 MIL-P-27235A 4.2.2.3 Sampling for passivation test. Sampling for passivation test shall b e in accordance with QQ-P-35. 4.2.2.4 Sampling for packaging and packing. Sampling for examination and test of preservation, packaging, packing and marking shall be in accordance with MIL-H-3982. 4.3 Exam
24、ination. 4.3.1 Visual and dimensional. Each pin taken as speci- fied in 4.2.2.1 shall b e examined to determine conformance with this specification. Examination shall be conducted in accordance with Table I. Any pin in the sample containing one or more defects shall be rejected, and if the number of
25、 defective pins in any sample exceeds the acceptance number for that sample, the lot represented by the sample shall be rejected. Table I Classification of Defects Categories Major 101 102 Defects Inspection Method AQL = 0.65 Pin diameter (3.5) SIE* Under head to centerline of drilled - hole (length
26、) (3.5) Minor 201 202 203 204 205 206 207 208 . 209 AC& = 6.5 Head diame ter (3.5) Head heisht (3.5) Under head to end (shank) (3.5) Overall length (3.5) Shank chamfer diameter (3.5) Head chamfer length (3.5) Hole size (3.5) Protective finish missing or Evidence of rust, pitting or spot- incomplete
27、(3.3) ting after passivation test (4.4.4) SIE SIE SIE SIE SIE SIE Gage Visual Visual c -ic SIE - Standard Inspection Zquipment 4.3.2 Packaging and packing. Examination and test of preservation, packaging, packing and marking shall be in accor- dance with MIL-H-3982. 5 Provided by IHSNot for ResaleNo
28、 reproduction or networking permitted without license from IHS-,-,-I MIL-P-27235A 4.4 Tests. 4.4.1 Chemical analysis. Pins taken as specified in 4,2.2,2 shall be subjected to a chemical analysis to deter- mine conformance to 3.1.1, 3.1.2 or 3,1,3, as applicable. The test shall be conducted in accord
29、ance with Method 111.2 of Fed, Teat Method Std. No, 151. A manufacturers material certificate may be accepted in lieu of this test. shall be subjected to a hardness test to determine conformance to 3,2. The test shall be conducted in accordance with ASTM 4.4,2 Hardness, Pins taken as specified in 4,
30、2.2.2 El$. 4.4.3 Shear strength. Pins taken as specified in 4.2.2.2 shall be subjected to 8 shear strength test to determine con- formance to 3.4, The pin shall be placed in a hole that passes through a shear block and a plunger within the Slock. The maximum clearance between the shearing planes of
31、the block and the plunger shall be 0.005 inch. The block and plunger shall be constructed so that the shear planes are normal to the longitudinal axis of the pin being tested. The block and plunger shall be made of hardened steel or shall have steel inserts with a minimum shearing-surface hardness o
32、f Rockwell 65. The clearance or interference between the pin and pinhole of the block and plunger shall be within the follow- ing limits: Pin size Max, clearance Max. interference (Inch) (Inch) (Inch) o. O003 O, 0004 o. 0005 O. 0006 o. 0002 O 0003 O. 0003 O. 0004 The pin to be tested shall be assemb
33、led to the block and plunger, with the two ends of the pin at least one pin diameter away from the shear planes, applied to the plunger shall be as shown on the standard for minimum double shear, For other pins, the load applied to the plunger shall be calculated from the minimum ultimate shear spec
34、ified in 3.1.1, 3.1.2 or 3.1.3, as applicable. If fracture occurs in the pin under the applied shear load, the pin shall be considered defactive. Pins too short to be tested in double shear shall be tested by applying the test to two pins simul- taneously in simgle shear, Pins shall be tested in ful
35、l size (d3.ameter) whenever practicable, For pins covered by MS35810, the load If it is not practical to 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-v MIL-P-27235A 53 M 7777906 0305785 O M r MIL-P-27235A test the full size pin, a test specimen
36、shall be cut from the pin and machined to the diametrical dimensions of a smaller size pin, and tested as above. 4.4.3.1 Alternate shear test. If so desired by the supplier, pins may be tested in single shear provided that all requirements, other than double shear, of 4.4.3 are met. 4.2.2.3 shall be
37、 subjected to a passivation test conducted in accordance with QQ-P-35. 4.4.4 Passivation. Each pin selected as specified in 4.5 Rejection and resubmission. Rejection and resub- mission of lots shall be in accordance with MIL-STD-105. 5. PREPARATION FOR DELIVEXY 5.1 Preservation, packaging and packin
38、g. The pins shall be preserved and packaged level A or G and packed level A, B or C in accordance with MIL-H-3982. The levels of protection shall be as specified in the contract or order (see 6.2). 5.2 Marking. Unless otherwise specified (see 6.2), interior packages and shipping containers shall be
39、marked in accordance with MIL-STD-129. 6. NOTES 6.1 Intended use. Clevis pins are intended for use in equipment for fastening clevises and eyes. 6.2 Ordering data. Procurement documents should specify the following: a. Title, number and date of this specification, b. Type, size and fini-sh required,
40、 c. Military Standard (MS) part number, if appli- cable. d. Levels of preservation, packaging and packing reauired ( 5.11. e. Special markinb, if required. Custodians: Army - WC Navy - None Air Force - 82 Preparing activity: Army - NC Pro j ec t No. 5315-0184 7 Provided by IHSNot for ResaleNo reprod
41、uction or networking permitted without license from IHS-,-,-Review activities : Army - FL, MI Navy - None Air Force - 85 NSA DSA - IS User activities: Army - AV, CE, ME Navy - AS, MC, OS, YD Air Force - None 8 y- _- i- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
