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MS35191 screw — flat countersunk, 82 degree

Screw, Machine, 82 Degree Flat Countersunk Head, Cross-Recessed, Carbon Steel, Cadmium Plated, UNF-2A, from MS35191 Rev. G. Every row below is transcribed from the standard and has its own link.

MS35191 at a glance

MS35191, screw, machine, 82 degree flat countersunk head, cross-recessed, carbon steel, cadmium plated, unf-2a
MS35191
MS35191 engineering drawing with dimensions
Engineering drawing · dimensions in inches

Specification

ItemValue
Headflat countersunk, 82 degree
Drivecross-recess (MS9006)
Thread seriesfine (UNF-2A)
MaterialCarbon steel per Fed. Std. No. 66, minimum ultimate tensile strength 60,000 psi.
Heat treatmentTensile load based on 60,000 psi minimum ultimate tensile strength.
ItemValue
FinishCadmium plate QQ-P-416 Type II Class 3, or MIL-C-81562.
ProcurementFF-S-92
Thread specificationHandbook H28
StatusRev. G (28 Jul 1976). Notice 1 (27 Oct 1999): canceled and superseded by NASM35191; the part numbers are identical (MS35191-209 = NASM35191-209). Approved 25 Jun 1953.

Dimensions by size

Dimension, in.060-80 UNF-2A.073-72 UNF-2A.086-64 UNF-2A.112-48 UNF-2A.138-40 UNF-2A.164-36 UNF-2A.190-32 UNF-2A.250-28 UNF-2A.3125-24 UNF-2A.375-24 UNF-2A.4375-20 UNF-2A.500-20 UNF-2A
nominal#0#1#2#4#6#8#101/45/163/87/161/2
D body dia.0496 – .0600.0615 – .0730.0733 – .0860.0954 – .1120.1184 – .1380.1424 – .1640.1658 – .1900.2225 – .2500.2806 – .3125.3430 – .3750.3995 – .4375.4619 – .5000
A head diamax sharp .119, min sharp .105, abs min .099max sharp .146, min sharp .130, abs min .123max sharp .172, min sharp .156, abs min .147max sharp .225, min sharp .207, abs min .195max sharp .279, min sharp .257, abs min .244max sharp .332, min sharp .308, abs min .292max sharp .385, min sharp .359, abs min .340max sharp .507, min sharp .477, abs min .452max sharp .635, min sharp .600, abs min .568max sharp .762, min sharp .722, abs min .685max sharp .812, min sharp .767, abs min .723max sharp .875, min sharp .831, abs min .775
H head height ref.035.043.051.067.083.100.116.153.191.230.223.223
H1 head height undercut.018 – .025.023 – .031.028 – .036.038 – .047.048 – .059.058 – .070.068 – .081.092 – .107.116 – .134.140 – .161.133 – .156.130 – .156
R radius max.024.029.034.045.055.066.076.100.125.150.175.200
R1 radius undercut max.009.011.013.017.021.025.029.038.047.056.066.075
min tensile lbf105165235395605880120021803480526071209590

Minimum – maximum as tabulated in MS35191 Rev. G; letters as on the standard's drawing.

Part numbers and lengths

Every part number of MS35191 Rev. G, by thread size, each with its own link.

.060-80 UNF-2A5 part numbers · tolerance +0/-.031

Part no.Length, in
MS35191-201.125
MS35191-202.188
MS35191-203.250
MS35191-204.312
MS35191-205.375

.073-72 UNF-2A7 part numbers · tolerance +0/-.031

Part no.Length, in
MS35191-206.125
MS35191-207.188
MS35191-208.250
MS35191-209.312
MS35191-210.375
MS35191-211.438
MS35191-212.500

.086-64 UNF-2A9 part numbers · tolerance +0/-.031

Part no.Length, in
MS35191-213.125
MS35191-214.188
MS35191-215.250
MS35191-216.312
MS35191-217.375
MS35191-218.438
MS35191-219.500
MS35191-220.625
MS35191-221.750

.112-48 UNF-2A11 part numbers · tolerance +0/-.031

Part no.Length, in
MS35191-222.125
MS35191-223.188
MS35191-224.250
MS35191-225.312
MS35191-226.375
MS35191-227.438
MS35191-228.500
MS35191-229.625
MS35191-230.750
MS35191-231.875
MS35191-2321.000

.138-40 UNF-2A15 part numbers

Part no.Length, inTol.
MS35191-233.125+0/-.031
MS35191-234.188+0/-.031
MS35191-235.250+0/-.031
MS35191-236.312+0/-.031
MS35191-237.375+0/-.031
MS35191-238.438+0/-.031
MS35191-239.500+0/-.031
MS35191-240.625+0/-.031
MS35191-241.750+0/-.031
MS35191-242.875+0/-.031
MS35191-2431.000+0/-.031
MS35191-2441.250+0/-.062
MS35191-2451.500+0/-.062
MS35191-2461.750+0/-.062
MS35191-2472.000+0/-.062

.164-36 UNF-2A19 part numbers

Part no.Length, inTol.
MS35191-248.125+0/-.031
MS35191-249.188+0/-.031
MS35191-250.250+0/-.031
MS35191-251.312+0/-.031
MS35191-252.375+0/-.031
MS35191-253.438+0/-.031
MS35191-254.500+0/-.031
MS35191-255.625+0/-.031
MS35191-256.750+0/-.031
MS35191-257.875+0/-.031
MS35191-2581.000+0/-.031
MS35191-2591.250+0/-.062
MS35191-2601.500+0/-.062
MS35191-2611.750+0/-.062
MS35191-2622.000+0/-.062
MS35191-2632.250+0/-.094
MS35191-2642.500+0/-.094
MS35191-2652.750+0/-.094
MS35191-2663.000+0/-.094

.190-32 UNF-2A18 part numbers

Part no.Length, inTol.
MS35191-267.188+0/-.031
MS35191-268.250+0/-.031
MS35191-269.312+0/-.031
MS35191-270.375+0/-.031
MS35191-271.438+0/-.031
MS35191-272.500+0/-.031
MS35191-273.625+0/-.031
MS35191-274.750+0/-.031
MS35191-275.875+0/-.031
MS35191-2761.000+0/-.031
MS35191-2771.250+0/-.062
MS35191-2781.500+0/-.062
MS35191-2791.750+0/-.062
MS35191-2802.000+0/-.062
MS35191-2812.250+0/-.094
MS35191-2822.500+0/-.094
MS35191-2832.750+0/-.094
MS35191-2843.000+0/-.094

.250-28 UNF-2A17 part numbers

Part no.Length, inTol.
MS35191-285.250+0/-.031
MS35191-286.312+0/-.031
MS35191-287.375+0/-.031
MS35191-288.438+0/-.031
MS35191-289.500+0/-.031
MS35191-290.625+0/-.031
MS35191-291.750+0/-.031
MS35191-292.875+0/-.031
MS35191-2931.000+0/-.031
MS35191-2941.250+0/-.062
MS35191-2951.500+0/-.062
MS35191-2961.750+0/-.062
MS35191-2972.000+0/-.062
MS35191-2982.250+0/-.094
MS35191-2992.500+0/-.094
MS35191-3002.750+0/-.094
MS35191-3013.000+0/-.094

.3125-24 UNF-2A15 part numbers

Part no.Length, inTol.
MS35191-302.375+0/-.031
MS35191-303.438+0/-.031
MS35191-304.500+0/-.031
MS35191-305.625+0/-.031
MS35191-306.750+0/-.031
MS35191-307.875+0/-.031
MS35191-3081.000+0/-.031
MS35191-3091.250+0/-.062
MS35191-3101.500+0/-.062
MS35191-3111.750+0/-.062
MS35191-3122.000+0/-.062
MS35191-3132.250+0/-.094
MS35191-3142.500+0/-.094
MS35191-3152.750+0/-.094
MS35191-3163.000+0/-.094

.375-24 UNF-2A13 part numbers

Part no.Length, inTol.
MS35191-317.500+0/-.031
MS35191-318.625+0/-.031
MS35191-319.750+0/-.031
MS35191-320.875+0/-.031
MS35191-3211.000+0/-.031
MS35191-3221.250+0/-.062
MS35191-3231.500+0/-.062
MS35191-3241.750+0/-.062
MS35191-3252.000+0/-.062
MS35191-3262.250+0/-.094
MS35191-3272.500+0/-.094
MS35191-3282.750+0/-.094
MS35191-3293.000+0/-.094

.4375-20 UNF-2A12 part numbers

Part no.Length, inTol.
MS35191-330.625+0/-.031
MS35191-331.750+0/-.031
MS35191-332.875+0/-.031
MS35191-3331.000+0/-.031
MS35191-3341.250+0/-.062
MS35191-3351.500+0/-.062
MS35191-3361.750+0/-.062
MS35191-3372.000+0/-.062
MS35191-3382.250+0/-.094
MS35191-3392.500+0/-.094
MS35191-3402.750+0/-.094
MS35191-3413.000+0/-.094

.500-20 UNF-2A11 part numbers

Part no.Length, inTol.
MS35191-342.750+0/-.031
MS35191-343.875+0/-.031
MS35191-3441.000+0/-.031
MS35191-3451.250+0/-.062
MS35191-3461.500+0/-.062
MS35191-3471.750+0/-.062
MS35191-3482.000+0/-.062
MS35191-3492.250+0/-.094
MS35191-3502.500+0/-.094
MS35191-3512.750+0/-.094
MS35191-3523.000+0/-.094

Part number

How a MS35191 part number is built, segment by segment

What each code means

PartMeaning
FormatMS35191-<dash number>[L]
ExampleMS35191-209 = plain screw, .073-72 UNF-2A, .312 long (Table I); MS35191-209L = the same with a self-locking element
Length tolerance, .125 to 1.000+0/-.031
Length tolerance, 1.250 to 2.000+0/-.062
Length tolerance, 2.250 to 3.000+0/-.094
(none)Locking: plain screw
LLocking: self-locking screw (patch or strip locking element per MIL-F-18240)
DashDash number from Table I selects thread size and length (201 to 352)

Notes from the standard

  • Head angle 82 degrees. Recess per MS9006. Screws above the dotted staircase lines of Table I (short lengths) have undercut heads (H1 / R1 dimensions); the dotted line is not legible enough in the scan to assign it dash by dash, so no per-row undercut flag is published.
  • Thread class 2A, Screw-Thread Standards for Federal Services (Handbook H28). Screws 2.00 inches long and shorter have complete threads extending to within two threads of the head, or closer if practicable; longer screws have a minimum thread length of 1.50 inches.
  • Self-locking screws: the locking element is a patch or longitudinal strip per MIL-F-18240; the maximum ring gage diameter that the locking region must pass freely or with finger pressure is the nominal size plus a small allowance (value not clearly legible in the scan); "X" and "Y" dimensions and design/usage limitations per MS15981.
  • Dash numbers marked * in Table I are inactive for new design after 2 February 1976. Dimensions in inches.
  • Sheet 2 (Table II) cross-references the AN505 / AN510 dash numbers cancelled after 24 Feb 1953 / 5 Apr 1962 (not transcribed).
  • Head height H prints .223 for both 7/16 and 1/2 sizes (copied as printed).

Related

CalculatorPart number cross-referenceType any MS35191 number and land on its row.GuideScrewsThe family side by side.Data sheetMS35190Screw, Machine, 82 Degree Flat Countersunk Head, Cross-Recessed, Carbon Steel, Cadmium Plated, UNC-2AData sheetMS51958Screw, Machine, Pan Head, Cross-Recessed, Corrosion Resisting Steel, UNF-2A

Sources

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
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