CSS™ and CSOS™ Stainless Steel Standoffs

This is a technical engineering diagram of a "Style #3" threaded fastener or insert, shown in a half-sectional view. Key dimensional labels include: A: Head thickness/height. B: Outer diameter of the shank. C: Overall head diameter. F: Internal thread depth. L: Total length of the shank from under the head. Internal Detail: Shows a female-threaded internal bore.

Entity: TYPE CSOS component (self-clinching standoff Key Features: Two Groove: Identifiable external marking (Registered Trademark. Internal Threads: Shown in cross-section view. Dimension Labels: A: Flange/head thickness. B: Outer body diameter. C: Flange/head diameter. F: Internal thread depth. L: Overall body length from under the head.

Drawing callouts: Style #1, Style #2, Style #3 (dimensions A, B, C, F, L); Type CSS and Type CSOS (dimension H); Two Groove (Registered Trademark). Clinching profile may vary.

Unified — all dimensions are in inches.

Thread Size	Type	Thread Code	Length Code "L" +.002 −.005 (Length code is in 16ths of an inch)								Min. Sheet Thickness	Blind Mounting Hole Dia. +.003 −.000	Min. Depth of Blind Hole⁽⁴⁾	Min. Depth Full Thread F	A (Shank) Max.	B Max.⁽⁵⁾	C Max.	H Nom.	Min. Dist. Hole ℄ To Edge
Thread Size	Stainless Steel	Thread Code	.187	.250	.312	.375	.500	.625	.750	1.00	Min. Sheet Thickness	Blind Mounting Hole Dia. +.003 −.000	Min. Depth of Blind Hole⁽⁴⁾	Min. Depth Full Thread F	A (Shank) Max.	B Max.⁽⁵⁾	C Max.	H Nom.	Min. Dist. Hole ℄ To Edge
.112-40 (#4-40)	CSS	440	3⁽¹⁾	4⁽²⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.062	.213	.043	.188	.041	.165	.212	.250	.188
.112-40 (#4-40)	CSOS	440	3⁽¹⁾	4⁽²⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.093	.213	.075	.188	.072	.165	.212	.250	.188
.138-32 (#6-32)	CSS	632	3⁽¹⁾	4⁽¹⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.062	.290	.043	.250	.041	.213	.289	.312	.219
.138-32 (#6-32)	CSOS	632	3⁽¹⁾	4⁽¹⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.093	.290	.075	.250	.072	.213	.289	.312	.219
.164-32 (#8-32)	CSS	832	3⁽¹⁾	4⁽¹⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.062	.312	.043	.250	.041	.245	.311	.344	.250
.164-32 (#8-32)	CSOS	832	3⁽¹⁾	4⁽¹⁾	5⁽²⁾	6⁽²⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.093	.312	.075	.250	.072	.245	.311	.344	.250
.190-32 (#10-32)	CSS	032	3⁽¹⁾	4⁽¹⁾	5⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.062	.344	.043	.375	.041	.290	.343	.375	.281
.190-32 (#10-32)	CSOS	032	3⁽¹⁾	4⁽¹⁾	5⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	.093	.344	.075	.375	.072	.290	.343	.375	.281
.250-20 (1/4-20)	CSS	0420	3⁽¹⁾	4⁽¹⁾	5⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽²⁾	12⁽³⁾	16⁽³⁾	.062	.390	.043	.375	.041	.354	.389	.438	.375
.250-20 (1/4-20)	CSOS	0420	3⁽¹⁾	4⁽¹⁾	5⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽²⁾	12⁽³⁾	16⁽³⁾	.093	.390	.075	.375	.072	.354	.389	.438	.375

Metric — all dimensions are in millimeters.

Thread Size x Pitch	Type	Thread Code	Length Code "L" +0.05 −0.13 (Length code is in millimeters)								Min. Sheet Thickness	Blind Mounting Hole Diameter +0.08	Min. Depth of Blind Hole⁽⁴⁾	Min. Depth Full Thread F	A (Shank) Max.	B Max.⁽⁵⁾	C Max.	H Nom.	Min. Dist. Hole ℄ To Edge
Thread Size x Pitch	Stainless Steel	Thread Code	Length Code "L" +0.05 −0.13 (Length code is in millimeters)								Min. Sheet Thickness	Blind Mounting Hole Diameter +0.08	Min. Depth of Blind Hole⁽⁴⁾	Min. Depth Full Thread F	A (Shank) Max.	B Max.⁽⁵⁾	C Max.	H Nom.	Min. Dist. Hole ℄ To Edge
M3 x 0.5	CSS	M3	4⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	1.6	5.41	1.1	5	1.04	4.2	5.39	6.35	4.8
M3 x 0.5	CSOS	M3	4⁽¹⁾	6⁽¹⁾	8⁽³⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	2.4	5.41	1.91	5	1.83	4.2	5.39	6.35	4.8
M4 x 0.7	CSS	M4	4⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽²⁾	12⁽³⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	1.6	7.92	1.1	6.5	1.04	6.23	7.9	8.74	6.4
M4 x 0.7	CSOS	M4	4⁽¹⁾	6⁽¹⁾	8⁽²⁾	10⁽³⁾	12⁽³⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	2.4	7.92	1.91	6.5	1.83	6.23	7.9	8.74	6.4
M5 x 0.8	CSS	M5	4⁽¹⁾	6⁽¹⁾	8⁽¹⁾	10⁽²⁾	12⁽²⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	1.6	8.74	1.1	9.6	1.04	7.37	8.72	9.53	7.2
M5 x 0.8	CSOS	M5	4⁽¹⁾	6⁽¹⁾	8⁽¹⁾	10⁽²⁾	12⁽²⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	2.4	8.74	1.91	9.6	1.83	7.37	8.72	9.53	7.2
M6 x 1	CSOS	M6	4⁽¹⁾	6⁽¹⁾	8⁽¹⁾	10⁽²⁾	12⁽²⁾	16⁽³⁾	20⁽³⁾	25⁽³⁾	2.4	9.9	1.91	9.6	1.83	9	9.89	11.11	9.5

(1) Style #1. Minimum thread length is equal to barrel length "L". Screw might not pass through shank end. Screws with lengths exceeding "L" should not be used or they may cause "jacking-out" of standoff from the sheet.

(2) Style #2. Screw might not pass through unthreaded end. Screws with lengths exceeding "L" should not be used or they may cause "jacking-out" of standoff from the sheet.

(3) Style #3. Blind.

(4) Blind mounting holes may be deeper than minimums except where sheet material is at or near minimum thickness. Fasteners should always be installed so the flange is flush with the surface of the sheet.

(5) If standoff is used as a bushing, the hole in attached part must not exceed "B" plus .020" / 0.51 mm.

Part Number Designation

Part Number	Type	Material	Thread Code	Length Code
CSS–632–6	CS	S	632	6
CSOS–632–6	CSO	S	632	6

CSS™ and CSOS™ Stainless Steel Standoffs

Part Number Designation

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