Knuckle Joints / Tapped / Configurable (FNTM8-1.25-D8-B8-U15)

[!] Thread depth ℓ: for M3 to 8: ℓ = M × 1.5; for M10 to 18: ℓ = M × 1.
[!] Unless otherwise specified, the dimension tolerance conforms to JIS B 0405 Class m. However, chamfer tolerance, tapped depth, T, T1, T2, and W dimension are excluded.

Part Number		DH7 Selection												B 1 mm Increments				U 5 mm Unit	A	L	T	T1	T2	W	d	h	d1	K	e
Type	M-Pitch													Convex Type	Concave Type
															Standard Type	Wide Type	Screw Mounted Type
Convex Type FNNB FNNM FNNS Standard Concave Type FNTB FNTM FNTS Wide Concave Type FNTWB FNTWM FNTWS Bolt Fixing Concave Type (* marked sizes only) FNTFB	* 3－0.5	3	4	5										3 to 10	3 to 5	6 to 10	6 to 10	10 to 20	L+6	U+10	10	9	10	19	3.2	3.5	6.5	5	2.5
	* 4－0.7																			U+15			12		4.2	4.5	8	6
	* 5－0.8		4	5	6									4 to 12	4 to 6	7 to 12	7 to 12	10 to 30			12	12	12	25	5.2	5.5	9.5	8	3.5
	* 6－1.0																						16		6.2	6.5	11	10	4
	8－1.0			5	6	8								5 to 16	5 to 8	9 to 16	—	15 to 30	L+8	U+20	16	16	—	32	—	—	—	—	—
	* 8－1.25																9 to 16						20		8.2	9	14	14	4
	10－1.25				6	8	10							6 to 20	6 to 10	11 to 20	—				20	19	—	38	—	—	—	—	—
	* 10－1.5																11 to 20						25		10.2	11	18	17	4
	12－1.25					8	10	12	13					8 to 22	8 to 11	12 to 22	—		L+10	U+25	22	22	—	44	—	—	—	—	—
	12－1.5
	14－1.5						10	12	13	14	15	16		10 to 25	10 to 13	14 to 25		20 to 30	L+12	U+30	25	25		50
	16－1.5																			U+35
	18－1.5													12 to 28	12 to 14	15 to 28			L+14		28	30
	22－1.5							12	13	14	15	16	20	12 to 32	12 to 16	—			L+16	U+45	32	—		—
	26－1.5													12 to 38	12 to 18				L+19	U+50	38

[!] Only * marked sizes are available for Bolt Fixing Concave Type (FNTFB).
[!] For Bolt Fixing Concave Type (FNTFB), when B < d₁ is specified, the knuckle joint shape is as the lower right photo shown above.
[!] For M22 to 1.5 and M26 to 1.5, only Convex Type and Standard Concave Type are available.