Small and Low Head Cap Screws

 

Part Number
TYPE	M-	L
Small Head / Standard SBB EN 1.7220 Equiv. Black Oxide SBBSS Stainless Steel Small Head / Low Head KBB EN 1.7220 Equiv. Black Oxide KBBS Stainless Steel Small Head / Extra Low Head CBBTB EN 1.7220 Equiv. Nickel Plating (Black) CBBTN EN 1.7220 Equiv. Nickel Plating (White) CBBTS Stainless Steel	2-	3
		4
		5
		6
	2.5-	3
		4
		5
		6
	3-	4
		5
		6
		8
		10
	4-	5
		6
		8
		10
		12
		16
		20
		25
	5-	6
		8
		10
		12
		16
		20
		25
	6-	6
		8
		10
		12
		16
		20
		25
	8-	10
		12
		16
		20
		25
		30
	10-	16
		20
		25
		30
		35
	12-	20
		25
		30

[Small Head Cap Screw Dimensions]

Head Dimensions		Head Diameter A	Standard Type		Low Head		Extra Low Head
			SBB SBBSS		KBB KBBS		CBBT□
			Height	Hex Socket	Height	Hex Socket	Height	(e)	Hex Socket
M	× P		E	B × (t)	E	B × (t)	E	max.	B × (t)
M2	× 0.4	3	—	—	—	—	1.1	1.2	1.3 × 1.2
M2.5	× 0.45	3.8	—	—	—	—	1.3	1.5	1.3 × 1.5
M3	× 0.5	4.5	3	2.5 × 1.5	2	2 × 1.5	1.5	1.6	1.5 × 2
M4	× 0.7	5.5	4	3 × 2	2.8	2.5 × 2			2 × 2.5
M5	× 0.8	7	5	4 × 2.5	3.5	3 × 2.5		2	3 × 3
M6	× 1.0	8.5	6	5 × 3	4	4 × 3		2.5	3 × 4
M8	× 1.25	10	8	6 × 4	5	5 × 4			4 × 5
M10	× 1.5	13	10	8 × 5	6	6 × 4.5		3	—
M12	× 1.75	16	12	10 ×6	7	8 × 5	—	—	—

■Recommended Tightening Torque (Reference)

Type	Standard Type		Low Head		Extra Low Head
Material	EN 1.7220 Equiv.	EN 1.4567 Equiv.	EN 1.7220 Equiv.	EN 1.4567 Equiv.	EN 1.7220 Equiv.	EN 1.4567 Equiv.
M2	—	—	—	—	0.25	0.25
M2.5	—	—	—	—	0.82	0.42
M3	1.0	1.0	0.8	0.5	0.9	0.8
M4	2.3	2.3	1.6	1.0	1.8	1.6
M5	4.6	4.6	3.2	2.0	3.2	3.0
M6	7.8	7.8	6.4	4.0	5.2	5.0
M8	19.0	19.0	9.6	5.6	9.0	8.6
M10	37.0	37.0	28.0	16.8	—
M12	65.0	65.0	40.0	24.0	—

The recommended tightening torques are the reference values; the optimum tightening torques vary depending on the operating environment.