MS16562 Spring Pin Decoder: Dash Number Lookup

What Size Is MS16562-33?

MS16562-33 is a 1/8 in slotted spring pin, 1/2 in long, in cadmium-plated carbon steel. The dash number carries no code: it is a lookup into Table II of the standard. Its range sets the material. Type a part number and the decoder gives the pin diameter, recommended hole, length tolerance, double-shear strength, material and finish. NASM16562 numbers are the same.

Going the other way? Type a size, such as 1/8 x 1/2, to get the part number in all three materials.

MS16562 DECODER

spring pins · tubular, slotted MS16562 Rev C, Mar 1986

Part number or size

Examples:

Part number	Nom	Pin Ø in	Length	L in	Material	Shear lb

How an MS16562 Part Number Works

1–94 carbon steel, cadmium plated 95–188 carbon steel, phosphate coated 189–282 CRES 410 or 420

Add 94 for phosphate, 188 for CRES: MS16562-33, -127 and -221 are all 1/8 × 1/2 in. Every number from 1 to 282 is used. There are no gaps and no exceptions.

Dash Numbers, Cadmium-Plated Steel (Table II). Add 94 for Phosphate, 188 for CRES

Length, in	Tol, in	.062	.078	.094	.125	.156	.188	.219	.250	.312	.375	.438	.500
.188 (3/16)	±.015	1
.250 (1/4)	±.015	2	11	21
.312 (5/16)	±.015	3	12	22
.375 (3/8)	±.015	4	13	23	31
.438 (7/16)	±.015	5	14	24	32
.500 (1/2)	±.015	6	15	25	33	40	46
.562 (9/16)	±.015	7	16	26	34
.625 (5/8)	±.015	8	17	27	35	41	47
.688 (11/16)	±.015	9
.750 (3/4)	±.015	10	18	28	36	42	48	54	62
.875 (7/8)	±.015		19	29	37	43	49	55	63
1.000 (1)	±.015		20	30	38	44	50	56	64	70	77
1.250 (1-1/4)	±.020				39	45	51	57	65	71	78	84
1.500 (1-1/2)	±.020						52	58	66	72	79	85	90
1.750 (1-3/4)	±.020						53	59	67	73	80	86	91
2.000 (2)	±.020							60	68	74	81	87	92
2.500 (2-1/2)	±.025							61	69	75	82	88	93
3.000 (3)	±.025									76	83	89	94

Columns are the nominal size in inches (1/16 to 1/2). Length tolerance from Table II.

Pin Diameter, Hole Size, Chamfer, Wall and Shear Strength (Table I)

Nominal size	Pin Ø D, in min avg – max	Recommended hole, in	Chamfer C, in	Chamfer Ø B max, in	Wall T nom, in	Double shear, lb min
.062 (1/16)	0.066–0.069	0.062–0.065	0.007–0.026	0.059	0.012	425
.078 (5/64)	0.083–0.086	0.078–0.081	0.008–0.032¹	0.075	0.018	650
.094 (3/32)	0.099–0.103	0.094–0.097	0.008–0.038	0.091	0.022	1,000
.125 (1/8)	0.131–0.135	0.125–0.129	0.008–0.044	0.122	0.028	2,100
.156 (5/32)	0.162–0.167	0.156–0.160	0.010–0.048	0.151	0.032	3,000
.188 (3/16)	0.194–0.199	0.187–0.192	0.011–0.055	0.182	0.040	4,400
.219 (7/32)	0.226–0.232	0.219–0.224	0.011–0.065	0.214	0.048	5,700
.250 (1/4)	0.258–0.264	0.250–0.256	0.012–0.065¹	0.245	0.048	7,700
.312 (5/16)	0.321–0.328	0.312–0.318	0.014–0.080	0.306	0.062	11,500
.375 (3/8)	0.385–0.392	0.375–0.382	0.016–0.095	0.368	0.077	17,600
.438 (7/16)	0.448–0.456	0.437–0.445	0.017–0.095	0.430	0.077	20,000
.500 (1/2)	0.513–0.521	0.500–0.510	0.025–0.110	0.485	0.094	25,800

All values in inches except shear (lb; 1 lb = 4.448 N). D min is the minimum average of three diameters (D1 + D2 + D3) / 3. Table I gives one double-shear value per size, with no split by material. ¹ Confirm the chamfer C maximum for 5/64 and 1/4 against the drawing.

Reference Guide: MS16562 Slotted Spring Pins

Reading the Number

The part number is the basic MS number plus a dash number from Table II (Requirement 5). The dash number is not a code. Its range sets the material and finish. Its place in the table sets the size and length.

MS16562-1: .062 nominal size, .188 long, carbon steel, cadmium plated (the sheet's own example).
MS16562-127: 1/8 × 1/2 in, phosphate-coated carbon steel.
MS16562-221: 1/8 × 1/2 in, CRES.

No gaps

Each material column has 94 sizes, in order from the smallest pin (1/16 × 3/16 in) to the largest (1/2 × 3 in). The phosphate number is always the cadmium number plus 94, and the CRES number plus 188. Nothing is skipped, so any number from 1 to 282 is a real part.

Length tolerance

±.015 in up to 1 in long, ±.020 in from 1-1/4 to 2 in, ±.025 in at 2-1/2 and 3 in.

Material, Hardness and Finish

Carbon steel (1–188): grades 1070 to 1095 (UNS G10700 to G10950), 46–53 HRC.
CRES (189–282): type 410 (UNS S41000) or 420 (UNS S42000), 43–52 HRC.
Both per the procurement specification, MIL-P-10971.

1–94: cadmium plated per QQ-P-416, Type II, Class 2.
95–188: phosphate coated per DOD-P-16232, Type Z, Class 2.
189–282: cleaned, descaled and passivated per ASTM A380.
Surface: roughness per ANSI B46.1, before coating.

Table I lists one minimum double-shear load per size. The sheet does not give a lower value for CRES.

Status, and MS16562 vs MS51923

MS16562 Revision C is dated 14 March 1986. Notice 1 (29 February 1996) is a notice of validation. Notice 2 (30 November 1998) cancelled MS16562 and superseded it with NASM16562. It states that the part numbers are identical, so MS16562-33 and NASM16562-33 are the same pin.

Source: MS16562C sheets 1 to 4 and Notices 1 and 2, from the DLA ASSIST database (Distribution A).

Slotted vs coiled

MS16562 covers the slotted type: a rolled tube with an open gap along its length (sheet 1 figure). MS51923 is a separate standard for coiled spring pins. This page uses only the MS16562 sheets, so it does not compare sizes or loads. The two numbering systems are unrelated. Check the MS51923 sheet before swapping one pin for the other.

MS16562 / NASM16562 Slotted Spring Pin Part Number Decoder: Size, Hole Size, Material and Shear Strength

Reading the Number

Material, Hardness and Finish

Status, and MS16562 vs MS51923

Cite This Work