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MS51958 screw — pan

Screw, Machine, Pan Head, Cross-Recessed, Corrosion Resisting Steel, UNF-2A, from MS51958 Rev. C w/ Amendment 1. Every row below is transcribed from the standard and has its own link.

MS51958 at a glance

MS51958, screw, machine, pan head, cross-recessed, corrosion resisting steel, unf-2a
MS51958
MS51958 engineering drawing with dimensions
Engineering drawing · dimensions in inches

Specification

ItemValue
Headpan
Drivecross-recess (MS9006)
Thread seriesfine (UNF-2A)
MaterialCorrosion-resisting steel, 300 series per QQ-S-763 and FED-STD-66, composition 304 or 316, or equal to / interchangeable with 18:8 or 16:18 chromium-nickel alloy steel.
Heat treatmentMinimum tensile strength load based on 80,000 psi minimum tensile strength (stress areas of FED-STD-H28).
ItemValue
FinishPassivate per QQ-P-35 (Amendment 1; originally cleaned and descaled per ASTM A380-78). Black oxide coating per the procurement specification when required (suffix B).
ProcurementFF-S-92
Thread specificationFED-STD-H28/2
StatusRev. C (11 Feb 1983) with Amendment 1 (5 Oct 1992). Notice 1 (30 Sep 1999): canceled and superseded by NASM51958; the part numbers are identical (MS51958-45 = NASM51958-45). Approved 12 Dec 1963.

Dimensions by size

Dimension, in.060-80 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
D1 body dia.0496 – .0600.0733 – .0860.0954 – .1120.1184 – .1380.1424 – .1640.1658 – .1900.2225 – .2500.2806 – .3125.3430 – .3750
A head dia.104 – .116.155 – .167.205 – .219.256 – .270.306 – .322.357 – .373.473 – .492.594 – .615.716 – .740
H head height.036 – .044.053 – .062.070 – .080.087 – .097.105 – .115.122 – .133.162 – .175.203 – .218.244 – .261
P head radius ref.005.010.010.015.015.020.035.040.040
R fillet max.009.013.017.021.025.029.038.047.056
driver size011222344
min tensile lbf14031053081011801600291046407020

Minimum – maximum as tabulated in MS51958 Rev. C w/ Amendment 1; letters as on the standard's drawing.

Part numbers and lengths

Every part number of MS51958 Rev. C w/ Amendment 1, by thread size, each with its own link.

.060-80 UNF-2A7 part numbers · tolerance +0/-1/32

Part no.Length, in
MS51958-1201/8
MS51958-1213/16
MS51958-1221/4
MS51958-1235/16
MS51958-1243/8
MS51958-1257/16
MS51958-1261/2

.086-64 UNF-2A10 part numbers · tolerance +0/-1/32

Part no.Length, in
MS51958-11/8
MS51958-23/16
MS51958-31/4
MS51958-45/16
MS51958-53/8
MS51958-67/16
MS51958-71/2
MS51958-85/8
MS51958-93/4
MS51958-107/8

.112-48 UNF-2A13 part numbers

Part no.Length, inTol.
MS51958-111/8+0/-1/32
MS51958-123/16+0/-1/32
MS51958-131/4+0/-1/32
MS51958-145/16+0/-1/32
MS51958-153/8+0/-1/32
MS51958-167/16+0/-1/32
MS51958-171/2+0/-1/32
MS51958-185/8+0/-1/32
MS51958-193/4+0/-1/32
MS51958-207/8+0/-1/32
MS51958-211+0/-1/32
MS51958-221-1/4+0/-1/16
MS51958-231-1/2+0/-1/16

.138-40 UNF-2A15 part numbers

Part no.Length, inTol.
MS51958-241/8+0/-1/32
MS51958-253/16+0/-1/32
MS51958-261/4+0/-1/32
MS51958-275/16+0/-1/32
MS51958-283/8+0/-1/32
MS51958-297/16+0/-1/32
MS51958-301/2+0/-1/32
MS51958-315/8+0/-1/32
MS51958-323/4+0/-1/32
MS51958-337/8+0/-1/32
MS51958-341+0/-1/32
MS51958-351-1/4+0/-1/16
MS51958-361-1/2+0/-1/16
MS51958-371-3/4+0/-1/16
MS51958-382+0/-1/16

.164-36 UNF-2A19 part numbers

Part no.Length, inTol.
MS51958-391/8+0/-1/32
MS51958-403/16+0/-1/32
MS51958-411/4+0/-1/32
MS51958-425/16+0/-1/32
MS51958-433/8+0/-1/32
MS51958-447/16+0/-1/32
MS51958-451/2+0/-1/32
MS51958-465/8+0/-1/32
MS51958-473/4+0/-1/32
MS51958-487/8+0/-1/32
MS51958-491+0/-1/32
MS51958-501-1/4+0/-1/16
MS51958-511-1/2+0/-1/16
MS51958-521-3/4+0/-1/16
MS51958-532+0/-1/16
MS51958-542-1/4+0/-3/32
MS51958-552-1/2+0/-3/32
MS51958-562-3/4+0/-3/32
MS51958-573+0/-3/32

.190-32 UNF-2A18 part numbers

Part no.Length, inTol.
MS51958-583/16+0/-1/32
MS51958-591/4+0/-1/32
MS51958-605/16+0/-1/32
MS51958-613/8+0/-1/32
MS51958-627/16+0/-1/32
MS51958-631/2+0/-1/32
MS51958-645/8+0/-1/32
MS51958-653/4+0/-1/32
MS51958-667/8+0/-1/32
MS51958-671+0/-1/32
MS51958-681-1/4+0/-1/16
MS51958-691-1/2+0/-1/16
MS51958-701-3/4+0/-1/16
MS51958-712+0/-1/16
MS51958-722-1/4+0/-3/32
MS51958-732-1/2+0/-3/32
MS51958-742-3/4+0/-3/32
MS51958-753+0/-3/32

.250-28 UNF-2A16 part numbers

Part no.Length, inTol.
MS51958-765/16+0/-1/32
MS51958-773/8+0/-1/32
MS51958-787/16+0/-1/32
MS51958-791/2+0/-1/32
MS51958-805/8+0/-1/32
MS51958-813/4+0/-1/32
MS51958-827/8+0/-1/32
MS51958-831+0/-1/32
MS51958-841-1/4+0/-1/16
MS51958-851-1/2+0/-1/16
MS51958-861-3/4+0/-1/16
MS51958-872+0/-1/16
MS51958-882-1/4+0/-3/32
MS51958-892-1/2+0/-3/32
MS51958-902-3/4+0/-3/32
MS51958-913+0/-3/32

.3125-24 UNF-2A15 part numbers

Part no.Length, inTol.
MS51958-923/8+0/-1/32
MS51958-937/16+0/-1/32
MS51958-941/2+0/-1/32
MS51958-955/8+0/-1/32
MS51958-963/4+0/-1/32
MS51958-977/8+0/-1/32
MS51958-981+0/-1/32
MS51958-991-1/4+0/-1/16
MS51958-1001-1/2+0/-1/16
MS51958-1011-3/4+0/-1/16
MS51958-1022+0/-1/16
MS51958-1032-1/4+0/-3/32
MS51958-1042-1/2+0/-3/32
MS51958-1052-3/4+0/-3/32
MS51958-1063+0/-3/32

.375-24 UNF-2A13 part numbers

Part no.Length, inTol.
MS51958-1071/2+0/-1/32
MS51958-1085/8+0/-1/32
MS51958-1093/4+0/-1/32
MS51958-1107/8+0/-1/32
MS51958-1111+0/-1/32
MS51958-1121-1/4+0/-1/16
MS51958-1131-1/2+0/-1/16
MS51958-1141-3/4+0/-1/16
MS51958-1152+0/-1/16
MS51958-1162-1/4+0/-3/32
MS51958-1172-1/2+0/-3/32
MS51958-1182-3/4+0/-3/32
MS51958-1193+0/-3/32

Part number

How a MS51958 part number is built, segment by segment

What each code means

PartMeaning
FormatMS51958-<dash number>[B]
ExampleMS51958-45 = .164-36 UNF-2A, 1/2 long, passivated; MS51958-45B = black oxide coated
Length tolerance, 1/8 to 1+0/-1/32
Length tolerance, 1-1/4 to 2+0/-1/16
Length tolerance, 2-1/4 to 3+0/-3/32
DashDash number from Table I selects thread size and length (1 to 126)
(none)Finish: passivated (cleaned and descaled before Amendment 1)
BFinish: black oxide coated

Notes from the standard

  • Thread per FED-STD-H28/2; threaded to within a distance of not less than two threads of the bearing surface of the head; screws 2-1/4 to 3 long have a minimum complete thread length of 1-3/4.
  • Magnetic permeability per the procurement specification. Recess per MS9006. Dimensions in inches. Lengths are printed as fractions (1-1/4 printed with a hyphen); there is no 9/16 length.
  • Dash numbers marked * (10, 22, 23, 54 to 58, 74, 75, 90, 91, 105, 106) are manufacturer non-stock production items (flagged nonstock in the data).
  • In Table I the .190 column starts at 3/16 (dash 58), the .250 column at 5/16 (76), the .3125 column at 3/8 (92) and the .375 column at 1/2 (107); dash numbers are assigned sequentially down each column and positions were fixed from that sequence and the printed row groups.

Related

CalculatorPart number cross-referenceType any MS51958 number and land on its row.GuideScrewsThe family side by side.Data sheetMS35191Screw, Machine, 82 Degree Flat Countersunk Head, Cross-Recessed, Carbon Steel, Cadmium Plated, UNF-2AData sheetMS51861Screw, Tapping, Thread Forming, Type AB, Pan Head, Cross-Recessed

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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