The Aviation PointTechnical data sheet · theaviationpoint.com/parts/nuts/ms35691/
MS35691 nut — hex jam nut, UNC/UNF, 1/4 to 3 in.
Nut, Plain, Hexagon (Jam), UNC-2B and UNF-2B, from MS35691 Rev. E. Every row below is transcribed from the standard and has its own link.
MS35691 at a glance
MS35691Engineering drawing · dimensions in inches
Specification
Item
Value
Type
Jam nut
Material
Carbon steel, grades B and C, per the procurement specification. CRES 300 series per the procurement specification (magnetic permeability 2.0 max, air = 1.0, at H = 200 oersteds, ASTM A342 indicator). Brass per the procurement specification.
Locking
None (jam nut, used to lock a plain or castellated nut or a rod end)
Item
Value
Finish
Cadmium plate, black oxide or phosphate coating per the procurement specification; CRES cleaned, descaled and passivated per ASTM A380 (black oxide, Class 4 per MIL-DTL-13924, with prefix B); brass black oxide, or nickel plated per the procurement specification (prefix N).
Procurement
FF-N-836
Status
Active. Rev. E (23 Mar 2005) is reactivated for new and existing designs and acquisitions; Notice 1 (6 Jun 2005) validates it for use in acquisition. Only the Table II part numbers are used for design; Table III numbers are cancelled and Table IV numbers inactive (maintenance only).
Dimensions by size
Dimension, in
.2500-20 UNC-2B
.2500-28 UNF-2B
.3125-18 UNC-2B
.3125-24 UNF-2B
.3750-16 UNC-2B
.3750-24 UNF-2B
.4375-14 UNC-2B
.4375-20 UNF-2B
.5000-13 UNC-2B
.5000-20 UNF-2B
.5625-12 UNC-2B
.5625-18 UNF-2B
.6250-11 UNC-2B
.6250-18 UNF-2B
.7500-10 UNC-2B
.7500-16 UNF-2B
.8750-9 UNC-2B
.8750-14 UNF-2B
1.0000-8 UNC-2B
1.0000-12 UNF-2B
1.1250-7 UNC-2B
1.1250-12 UNF-2B
1.2500-7 UNC-2B
1.2500-12 UNF-2B
1.3750-6 UNC-2B
1.3750-12 UNF-2B
1.5000-6 UNC-2B
1.5000-12 UNF-2B
1.7500-5 UNC-2B
2.0000-4-1/2 UNC-2B
2.2500-4-1/2 UNC-2B
2.5000-4 UNC-2B
2.7500-4 UNC-2B
3.0000-4 UNC-2B
F — Width across flats (headed P in the table, F on the drawing)
.4375 – .428
.4375 – .428
.5000 – .489
.5000 – .489
.5625 – .551
.5625 – .551
.6875 – .675
.6875 – .675
.7500 – .736
.7500 – .736
.8750 – .861
.8750 – .861
.9375 – .922
.9375 – .922
1.1250 – 1.088
1.1250 – 1.088
1.3125 – 1.269
1.3125 – 1.269
1.5000 – 1.450
1.5000 – 1.450
1.6875 – 1.631
1.6875 – 1.631
1.8750 – 1.812
1.8750 – 1.812
2.0625 – 1.994
2.0625 – 1.994
2.2500 – 2.175
2.2500 – 2.175
2.6250 – 2.538
3.0000 – 2.900
3.3750 – 3.262
3.7500 – 3.625
4.1250 – 3.988
4.5000 – 4.350
G — Width across corners
.505 – .488
.505 – .488
.577 – .557
.577 – .557
.650 – .628
.650 – .628
.794 – .768
.794 – .768
.866 – .840
.866 – .840
1.010 – .982
1.010 – .982
1.083 – 1.051
1.083 – 1.051
1.299 – 1.240
1.299 – 1.240
1.516 – 1.447
1.516 – 1.447
1.732 – 1.653
1.732 – 1.653
1.949 – 1.859
1.949 – 1.859
2.165 – 2.066
2.165 – 2.066
2.382 – 2.273
2.382 – 2.273
2.598 – 2.480
2.598 – 2.480
3.031 – 2.893
3.464 – 3.306
3.897 – 3.719
4.330 – 4.133
4.763 – 4.546
5.196 – 4.959
H — Thickness
.163 – .150
.163 – .150
.195 – .180
.195 – .180
.227 – .210
.227 – .210
.260 – .240
.260 – .240
.323 – .302
.323 – .302
.324 – .301
.324 – .301
.387 – .363
.387 – .363
.446 – .398
.446 – .398
.510 – .458
.510 – .458
.575 – .519
.575 – .519
.639 – .579
.639 – .579
.751 – .687
.751 – .687
.815 – .747
.815 – .747
.880 – .808
.880 – .808
1.009 – .929
1.138 – 1.050
1.251 – 1.155
1.505 – 1.401
1.634 – 1.522
1.763 – 1.643
Maximum – minimum as tabulated in MS35691 Rev. E; letters as on the standard's drawing.
Dimensions in inches; two optional designs (with or without a .016 approx. washer face, 30 deg +/-2 deg chamfer). F, G and H depend only on the nominal size, so UNC and UNF threads of one size share them.
Phosphate-coated grade B nuts (3-digit dash ending in 6) exist only for 1/4 to 1/2, 5/8 and 3/4 (none for 9/16 or for 7/8 and larger).
Substitutes lists, as printed in Table VI, each cancelled (Table III, cancelled after 21 Mar 1966) or inactivated (Table IV) dash number and the Table II dash that supersedes it. The 'inactivated' ones (those marked 1/ in the sheet, grade B/C uncoated 404, 407, ...) can still be used for maintenance.
Table VII lists MS16203 (Ships) dash numbers cancelled and replaced by Table II numbers (not transcribed).
Printed oddities: the thickness H printed for 1/2 (.323/.302) and 9/16 (.324/.301) is nearly equal, and Table IV prints 2.0000-4-1/4 UNC where 4-1/2 UNC is meant.
Threads per FED-STD-H28/2; acceptability of screw threads per FED-STD-H28/20, System 21.
For design feature purposes this standard takes precedence over the referenced procurement documents.
MS35691 Rev. E, 23 Mar 2005 — Nut, Plain, Hexagon (Jam) UNC-2B and UNF-2B — dimensions, part numbers and notes. Public domain, distribution unlimited. Notices: Notice 1 (6 Jun 2005): notice of validation; MS35691E dated 23 March 2005 reviewed and determined to be valid for use in acquisition.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
