Bush Hog RTH, RTNR manual Torque Specifications, American, Metric, Bolt Head Markings

TORQUE SPECIFICATIONS

	Proper toque for American fasteners used on Bush Hog equipment.
AMERICAN	Recommended Torque in Foot Pounds (Newton Meters).*
Bolt Head Markings		BOLT DIAMETER
	WRENCH	(IN.) “B” AND	SAE	SAE	SAE
	SIZE (IN.) “A”	THREAD SIZE	GRADE 2	GRADE 5	GRADE 8

Wrench Size “A”

SAE Grade 2 (No Dashes)

SAE Grade 5

(3 Dashes)

	lt		B”
o
B		“
		r
	ete
m
ia
D

SAE Grade 8

(6 Dashes)

7/16	1/4 - 2O UNC	6	(7)	8 (11)		12	(16)
7/16	1/4 - 28 UNF	6	(8)	10	(13)	14	(18)
1/2	5/16 - 18 UNC	11	(15)	17	(23)	25	(33)
1/2	5/16 - 24 UNF	13	(17)	19	(26)	27	(37)
9/16	3/8 - 16 UNC	20	(27)	31	(42)	44	(60)
9/16	3/8 - 24 UNF	23	(31)	35	(47)	49	(66)
5/8	7/16 - 14 UNC	32	(43)	49	(66)	70	(95)
5/8	7/16 - 20 UNF	36	(49)	55	(75)	78 (106)
3/4	1/2 - 13 UNC	49	(66)	76 (103)		106	(144)
3/4	1/2 - 20 UNF	55	(75)	85 (115)		120	(163)
7/8	9/16 - 12 UNC	70	(95)	109	(148)	153	(207)
7/8	9/16 - 18 UNF	79 (107)		122	(165)	172	(233)
15/16	5/8 - 11 UNC	97 (131)		150	(203)	212	(287)
15/16	5/8 - 18 UNF	110	(149)	170	(230)	240	(325)
1-1/8	3/4 - 10 UNC	144	(195)	266	(360)	376	(509)
1-1/8	3/4 - 16 UNF	192	(260)	297	(402)	420	(569)
1-5/16	7/8 - 9 UNC	166	(225)	430	(583)	606	(821)
1-5/16	7/8 - 14 UNF	184	(249)	474	(642)	668	(905)
1-1/2	1 - 8 UNC	250	(339)	644	(873)	909 (1232)
1-1/2	1 - 12 UNF	274	(371)	705	(955)	995 (1348)
1-1/2	1 - 14 UNF	280	(379)	721	(977)	1019	(1381)
1-11/16	1-1/8 - 7 UNC	354	(480)	795 (1077)		1288(1745)
1-11/16	1-1/8 - 12 UNF	397	(538)	890 (1206)		1444	(1957)
1-7/8	1-1/4 - 7 UNC	500	(678)	1120	(1518)	1817	(2462)
1-7/8	1-1/4 - 12 UNF	553	(749)	1241	(1682)	2013	(2728)
2-1/16	1-3/8 - 6 UNC	655	(887)	1470	(1992)	2382	(3228)
2-1/16	1-3/8 - 12 UNF	746 (1011)		1672	(2266)	2712	(3675)
2-1/4	1-1/2 - 6 UNC	870 (1179)		1950	(2642)	3161	(4283)
2-1/4	1-1/2 - 12 UNF	979 (1327)		2194	(2973)	3557	(4820)

METRIC

Wrench

Size “A” 8.8

	lt			”
o			B
B		“
		r
	e
	t
	e
m
ia
D

Proper torque for metric fasteners used on Bush Hog equipment.

Recommended torque in foot pounds (newton Meters).*

—WRENCH	BOLT
SIZE	DIA.	ASTM		ASTM	ASTM		ASTM
(mm) “A”	(mm) “B”	4.6		8.8	9.8		10.9
8	5	1.8	(2.4)		5.1	(6.9)	6.5	(8.8)
10	6	3	(4)		8.7 (12)		11.1 (15)
13	8	7.3 (10)			21.1 (29)		27	(37)
16	10	14.5 (20)			42	(57)	53	(72)
18	12	25	(34)	74 (100)	73	(99)	93 (126)
21	14	40	(54)	118 (160)	116	(157)	148	(201)

Numbers appearing on bolt heads indicate ASTM class.

*U se 75% of	the spe	cif ied torque value fo		r
plat ed fast	en ers. Use 85% of t		he spec	i-
fied torque values for		lubricated f	ast en ers .

24	16	62	(84)	167	(226)	181 (245)	230	(312)
30	20	122	(165)	325	(440)		449	(608)
33	22			443	(600)		611	(828)
36	24	211	(286)	563	(763)		778 (1054)
41	27			821 (1112)			1138	(1542)
46	30	418	(566)	1119	(1516)		1547	(2096)

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