MS35338 at a glance

MS35338, washer, lock-spring, helical, regular (medium) series — MS35338

MS35338 engineering drawing with dimensions — MS35338

Current standard: NASM35338. MS35338 is now controlled by NASM35338 (MS35338L Notice 4 (18 Jul 2002)). The part numbers do not change: MS35338-39 is still the number on drawings, IPCs and bags, and it is the same part. Order it by that number; the current document is NASM35338.

Specification

Item	Value
Current standard	NASM35338 (part numbers unchanged)
Type	Lock washer
Material	Carbon steel, grade 1060 (UNS G10600) thru 1080 (UNS G10800) per ASTM A29 (hardness 38 to 46 HRC). CRES non-magnetic: Type 316 (UNS S31600) up to 1/4 in., Type 300 series (UNS S30200 to S31600) for all other sizes (35 to 43 HRC; magnetic permeability 2.0 max at H = 200 oersteds, ASTM A342); CRES magnetic: Type 420 (UNS S42000) (45 to 53 HRC). Phosphor bronze, copper alloy no. 510 (UNS C51000) per ASTM B159, and tin-brass, composition 425 (UNS C42500) per ASTM B591 (90 HRB min). Nickel-copper-aluminum alloy, Form 2 (UNS N05500) per QQ-N-286 (33 to 40 HRC).
Locking	Helical spring (split) washer

Item	Value
Finish	Carbon steel: phosphate coating per MIL-P-16232, Type I, Class 2; or cadmium plating per QQ-P-416, Type II, Class 2 or MIL-C-81562, Type II, Class 2; or mechanically deposited zinc per MIL-C-81562, Type II, Class 6. CRES: passivated per QQ-P-35; black oxide per MIL-C-13924, Class 4 (CRES 300 series only; add letter B). Phosphor bronze and tin-brass: cadmium plated per QQ-P-416, Type II, Class 3 (use a magnet to tell them from carbon steel). Nickel-copper-aluminum alloy: uncoated.
Procurement	ASME B18.21.1 (solicitation reference)
Status	Cancelled. Rev. L (7 Apr 1994) was reinstated by Notice 2 (20 Oct 1995), made inactive for new design by Notice 3 (20 Jan 2000) and cancelled by Notice 4 (18 Jul 2002), superseded by NASM35338 with identical part numbers.

Dimensions by size

Dimension, in	No. 2	No. 4	No. 6	No. 8	No. 10	1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4	7/8	1	1 1/8	1 1/4	1 3/8	1 1/2
A — Inside diameter (ØA), max / min	.094 – .088	.120 – .114	.148 – .141	.174 – .167	.200 – .193	.260 – .252	.322 – .314	.385 – .377	.450 – .440	.512 – .502	.574 – .564	.641 – .628	.766 – .753	.894 – .878	1.024 – 1.003	1.153 – 1.129	1.280 – 1.254	1.408 – 1.379	1.534 – 1.504
B — Outside diameter (ØB), max	.172	.209	.250	.293	.334	.487	.583	.680	.776	.889	.965	1.073	1.265	1.459	1.656	1.847	2.036	2.219	2.419
W — Washer section width, min	.035	.040	.047	.055	.062	.109	.125	.141	.156	.171	.188	.203	.234	.266	.297	.328	.359	.391	.422
C — Washer thickness C = (t+t)/2, min (see requirement 4)	.020	.025	.031	.040	.047	.062	.078	.094	.109	.125	.141	.156	.188	.219	.250	.281	.312	.344	.375

Maximum – minimum as tabulated in MS35338 Rev. L; letters as on the standard's drawing.

Part numbers

Part no.	Size	Dash, phosphate steel	Dash, PH bronze / tin-brass	Dash, Ni-Cu-Al alloy	Dash, CRES 300	Dash, CRES 420
MS35338-39	No. 2 (.086)	58	96	115	134	153
MS35338-40	No. 4 (.112)	59	97	116	135	154
MS35338-41	No. 6 (.138)	60	98	117	136	155
MS35338-42	No. 8 (.164)	61	99	118	137	156
MS35338-43	No. 10 (.190)	62	100	119	138	157
MS35338-44	1/4 (.250)	63	101	120	139	158
MS35338-45	5/16 (.312)	64	102	121	140	159
MS35338-46	3/8 (.375)	65	103	122	141	160
MS35338-47	7/16 (.437)	66	104	123	142	161
MS35338-48	1/2 (.500)	67	105	124	143	162
MS35338-49	9/16 (.562)	68	106	125	144	163
MS35338-50	5/8 (.625)	69	107	126	145	164
MS35338-51	3/4 (.750)	70	108	127	146	165
MS35338-52	7/8 (.875)	71	109	128	147	166
MS35338-53	1 (1.000)	72	110	129	148	167
MS35338-54	1 1/8 (1.125)	-	111	130	149	168
MS35338-55	1 1/4 (1.250)	-	112	131	150	169
MS35338-56	1 3/8 (1.375)	-	113	132	151	170
MS35338-57	1 1/2 (1.500)	-	114	133	152	171

Every part number of MS35338 Rev. L, each with its own link. Codes (material, finish) build the full number in the box below.

Part number

What each code means

Part	Meaning
Format	MS35338-<dash>{bo}
(none)	Bo: No letter
B	Bo: Black oxide coated (CRES 300 series only; letter B after the dash number), e.g. MS35338-134B
steel_cad_zinc	Material: Carbon steel, cadmium or zinc plated (basic dash, Carbon Steel CAD OR ZINC column)
steel_phosphate	Material: Carbon steel, phosphate coated (PHOS column)
phbronze_tinbrass	Material: Phosphor bronze or tin-brass, cadmium plated
nickel_copper_alum	Material: Nickel-copper-aluminum alloy, uncoated
cres_300	Material: CRES 300 series (Type 316 up to 1/4 in.), passivated
cres_420	Material: CRES 420, passivated
Example	MS35338-48 — Helical-spring lock washer, regular (medium) series, 1/2 (.500) nominal diameter, carbon steel, cadmium or zinc plated.

Notes from the standard

Dimensions in inches. Maximum tolerance printed for nominal series .086 thru .190: +.006; .250 thru .750: +.010; .875 thru 1.500: +.020 (see Table I).
Phosphate-coated carbon steel does not exist above size 1 in. (dash shown as -).
After 21 Mar 1966 washers on MS16214, MS35337 and NAS1061 (and MS35338 in part) are inactive for design and cancelled; AN935 washers are inactive for new design. Existing stock may be used for maintenance until depleted; use the MS35338 substitutes of Table II in the sheet (not transcribed here).
Packaging per ASTM D3951. In the event of conflict between the text of this document and the references cited, the text of this document takes precedence.

Sources

MS35338 Rev. L, 7 Apr 1994 — Washer, Lock-Spring, Helical, Regular (Medium) Series — dimensions, part numbers and notes. Public domain, distribution unlimited. Notices: Notice 2 (20 Oct 1995): notice of reinstatement; MS35338L (7 Apr 1994) reinstated and may be used for acquisition (supersedes Notice 1 of 30 Jan 1995, not in the folder).; Notice 3 (20 Jan 2000): MS35338L inactive for new design and no longer used except for replacement purposes.; Notice 4 (18 Jul 2002): MS35338L cancelled and superseded by NASM35338; the part identification number of MS35338L and the part number of NASM35338 are identical, part numbers unchanged (example MS35338-48).

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