Torque Specifications

TECHNICAL DATA

Engine crankshaft bolt	50 ft/lb (67 Nm)	Standard 5/16" fasteners	18 ft/lb (25 Nm)
Deck pulley bolts	150 ft/lb (203 Nm)	Standard 3/8" fasteners	33 ft/lb (44 Nm)
Lug nuts	75 ft/lb (100 Nm)	Standard 7/16" fasteners	52 ft/lb (70 Nm)
Blade bolt	90 ft/lb (122 Nm)	Standard ½" fasteners	80 ft/lb (110 Nm)
Standard ¼" fasteners	9 ft/lb (12 Nm)

HEX HEAD CAP SCREWS

The torque values shown should be used as a general guideline when specific torque values are not given.

U.S. Standard Hardware

Grade

Shank Size (Diameter in inches, fine or coarse thread)

Size

5/16

3/8

7/16

9/16

5/8

7/8

11/8

SAE Grade 5		SAE Grade 8		Flangelock Screw
				w/Flangelock Nut
ft./lbs	Nm	ft./lbs	Nm	ft./lbs	Nm
ft./lbs	Nm	ft./lbs	Nm	ft./lbs	Nm
9	12	13	18
18	24	28	38	24	33
31	42	46	62	40	54
50	68	75	108
75	102	115	156
110	150	165	224
150	203	225	305
250	339	370	502
378	513	591	801
782	1060	1410	1912

** Grade 5 - Minimum commercial quality (lower quality not recommended)

Grade

Shank Size (Diameter in millimeters, fine or coarse thread)

Size

M10

M12

M14

M16

M18

M20

M22

M24

M27

Metric Standard Hardware

Grade 8.8		Grade 10.9		Grade 12.9

ft./lbs	Nm	ft./lbs	Nm	ft./lbs	Nm
1.5	2	2.2	3	2.7	3.6
3	4	4.5	6	5.2	7
5.2	7	7.5	10	8.2	11
8.2	11	12	16	15	20
13.5	18	18.8	25	21.8	29
24	32	35.2	47	43.5	58
43.5	58	62.2	83	75	100
70.5	94	100	133	119	159
108	144	147	196	176	235
142	190	202	269	242	323
195	260	275	366	330	440
276	368	390	520	471	628
353	470	498	664	596	794
530	707	474	996	904	1205

RZ4221 BF / 967176101 specifications

The Husqvarna RZ4221 BF, model number 967176101, epitomizes innovation and performance in the realm of residential lawn care. This robust zero-turn mower is designed for homeowners seeking efficiency, speed, and precision in managing their outdoor spaces.

One of the standout features of the RZ4221 BF is its powerful Briggs & Stratton engine, which provides a reliable 21 horsepower. This engine ensures optimal performance, allowing users to navigate various terrains with ease. The mower’s cutting deck spans 42 inches, allowing for a wide cutting swath that significantly reduces mowing time compared to traditional mowers. Moreover, the cutting deck is constructed from high-quality steel, ensuring durability and longevity.

The zero-turn technology in the RZ4221 BF offers exceptional maneuverability, allowing for sharp turns and easy navigation around obstacles such as trees, flower beds, and garden furniture. This feature is particularly beneficial for homeowners with intricate landscapes, as it enables precise trimming without damaging surrounding greenery.

Another highlight of this mower is its adjustable cutting height, which ranges from 1.5 to 4 inches. Users can easily customize the grass length to their preference, promoting a healthy lawn while adapting to seasonal changes. The ergonomic seat design enhances user comfort during extended mowing sessions, while the simplified dashboard provides intuitive controls for ease of operation.

The Husqvarna RZ4221 BF is also equipped with sturdy rear wheels, ensuring stability and traction on uneven terrain. This stability is accompanied by a robust frame, which contributes to the mower's durability and enhances overall performance.

In terms of maintenance, the RZ4221 BF is designed with user convenience in mind. The mower features an easy-access oil drain and integrated washing ports for hassle-free deck cleaning. Furthermore, the hydrostatic transmission system allows for smooth speed adjustments without the need for constant gear shifting, providing a smoother mowing experience.

In conclusion, the Husqvarna RZ4221 BF (967176101) combines powerful performance, innovative features, and user-friendly design, making it an excellent choice for homeowners looking to maintain their lawns effortlessly. Its robust construction, versatile cutting options, and advanced maneuverability make it a standout in the market. Whether you're tackling a small yard or a sprawling landscape, the RZ4221 BF is engineered to meet your mowing needs with efficiency and ease.

TECHNICAL DATA