Toro 4100-D service manual Other Torque Specifications, Conversion Factors

Other Torque Specifications

SAE Grade 8 Steel Set Screws

Thread Size	Recommended Torque
	Square Head	Hex Socket
1/4 -- 20 UNC	140 + 20 in--lb	73 + 12 in--lb
5/16 -- 18 UNC	215 + 35 in--lb	145 + 20 in--lb
3/8 -- 16 UNC	35 + 10 ft--lb	18 + 3 ft--lb
1/2 -- 13 UNC	75 + 15 ft--lb	50 + 10 ft--lb

Thread Cutting Screws

(Zinc Plated Steel)

Type 1, Type 23 or Type F

Thread Size	Baseline Torque*
No. 6 -- 32 UNC	20	+ 5 in--lb
No. 8 -- 32 UNC	30	+ 5 in--lb
No. 10 -- 24 UNC	38	+ 7 in--lb
1/4 -- 20 UNC	85 + 15 in--lb
5/16 -- 18 UNC	110	+ 20 in--lb
3/8 -- 16 UNC	200 + 100 in--lb

Wheel Bolts and Lug Nuts

Thread Size		Recommended Torque**
7/16 -- 20 UNF		65 + 10 ft--lb		88 + 14 N--m
Grade 5
1/2 -- 20 UNF		80 + 10 ft--lb		108 + 14 N--m
Grade 5
M12 X 1.25		80 + 10 ft--lb		108 + 14 N--m
Class 8.8
M12 X 1.5		80 + 10 ft--lb		108 + 14 N--m
Class 8.8
** For steel wheels and non--lubricated fasteners.
	Thread Cutting Screws
	(Zinc Plated Steel)
Thread	Threads per Inch
Size			Baseline Torque*
	Type A	Type B
No. 6	18	20		20 + 5 in--lb
No. 8	15	18		30 + 5 in--lb
No. 10	12	16		38 + 7 in--lb
No. 12	11	14		85 + 15 in--lb

*Hole size, material strength, material thickness and fin- ish must be considered when determining specific torque values. All torque values are based on non--lubri- cated fasteners.

Conversion Factors

in--lb X 11.2985	= N--	cm	N--cm X 0.08851 = in--lb
ft--lb X 1.3558	= N--	m	N--m X 0.7376 = ft--lb

Product Records and Maintenance Page 2 -- 6 Groundsmaster 4100--D