Gravely Mower Blade Bolt Torque Specs

Gravely's entire current commercial line — Pro-Turn, Pro-Stance, Z-Stance, Compact-Pro, ZT HD and Pro-Walk Hydro — shares one blade-bolt spec, 115–160 lb-ft (156–217 N·m), across every operator's manual we pulled. The residential ZT XL is lower, 80–120 lbf-ft on a 5/8-inch hex bolt; the newer ZT X/ZT XL manuals drop the figure entirely and send owners to the service manual instead. All figures below are quoted from the Gravely operator's manuals. No socket size or thread pitch is stated.

What torque should I use on a Gravely blade bolt?

Gravely blade bolt torque is typically 80–160 lb-ft — see table. Threadlocker: Not called for in the Gravely manuals cited below. Always confirm the exact figure for your specific model — deck design, blade thickness, and spindle stack-up move the spec by 10–20 ft-lb between models in the same brand line.

Gravely ZT-XL 52 (Residential Zero-Turn) blade bolt torque

80–120 lbf-ft (108–163 N·m) with a 5/8" hex bolt. Gravely ZT XL Owner/Operator Manual 00698300A (models incl. 915082 ZT2552XL 52"), p.GB-17, Install: "Torque 5/8-inch hex bolt to 80 to 120 lbf-ft (108 to 163 N•m)." Identical wording in the later ZT XL manual 04052400 (p.GB-19). The current-generation ZT X/XL manual 05278700B prints no blade torque at all, so nothing newer supersedes this. 5/8" is the bolt diameter, not a socket size; pitch and socket are not stated.

Gravely Pro-Turn 260 (Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn 200 Operator's Manual 05296800B (models 992267/992269/992272/992296 Pro-Turn 260), p.EN-25, "Install Blades": "Secure lower spindle guards and blades to spindles with one bevel washer and hex bolt. Torque to 156 N•m – 217 N•m (115 lb-ft – 160 lb-ft)." Manual cautions that mating surfaces between spindle, guard, blade and washer must be free of debris. Socket and thread size are not stated.

Gravely ZT HD (44/48/52/60, Residential Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely ZT HD Operator's Manual 30204000D (models 991267 ZT HD 44, 991269 ZT HD 48, 991277 ZT HD 52, 991279 ZT HD 60), p.25, Install Blades: "Reinstall blades and secure with original hardware. Torque to 156 – 217 N•m (115 – 160 lb-ft)." Also confirmed in the CRITICAL TORQUES table on p.46: "Blade to spindle 1380 – 1920 [lb-in] 115 – 160 [lb-ft] 156 – 217 [N·m]." Socket and thread size are not stated.

Gravely Pro-Turn 100 (148/152/160, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (155.9–216.9 N·m). Gravely Pro-Turn 100 Operator's Manual 30319000 (models 991128 Pro-Turn 148, 991129 Pro-Turn 152, 991130 Pro-Turn 160), p.29, Install Blades: "Secure blades to spindles with hardware removed earlier. See Critical Torques on page 44." CRITICAL TORQUES table (p.46): "Mower Blade Hardware 115 – 160 [lb-ft] 155.9 – 216.9 [N·m]." Socket and thread size are not stated.

Gravely Pro-Turn 300 (352/360/372, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn 300 Operator's Manual 30190900C (models 992525 Pro-Turn 372, 992526 Pro-Turn 360, 992528/992532 Pro-Turn 352, 992529 Pro-Turn 360 EFI), p.28, Install Blades: "Install blades onto spindles and secure with original hardware. Torque to 156 – 217 N•m (115 – 160 lb-ft)." Socket and thread size are not stated.

Gravely Pro-Turn 500 (552/560/572, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn 500 Operator's Manual 30366300A (models 992510/992533 Pro-Turn 552, 992511/992530/992534 Pro-Turn 560, 992512/992531/992535 Pro-Turn 572), p.51, CRITICAL TORQUES table: "Mower Blade Hardware 115 – 160 [lb-ft] 156 – 217 [N·m]." Manual 30366300A is shared with the Pro-Turn Mach One. Socket and thread size are not stated.

Gravely Pro-Turn 600 (652/660/672, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn 600 Operator's Manual 30327600 (models 992501/992503 Pro-Turn 660, 992502/992504 Pro-Turn 672, 992505 Pro-Turn 652), p.30, Install Blades: "Secure blades to spindle with one bevel washer and one hex bolt. Torque to 156 – 217 N•m (115 – 160 lb-ft)." No CRITICAL TORQUES summary table was found in this manual — the value appears only in the narrative install step. Socket and thread size are not stated.

Gravely Pro-Turn Mach One (992515/992519, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn Mach One Operator's Manual 30366300A (models 992515, 992519), p.51, CRITICAL TORQUES table: "Mower Blade Hardware 115 – 160 [lb-ft] 156 – 217 [N·m]." AriensCo issues one operator's manual, 30366300A, covering both Mach One and the Pro-Turn 500 line. Socket and thread size are not stated.

Gravely Pro-Turn ZX (48/52/60, Commercial Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Turn ZX Operator's Manual 30274100A (models 991287 ZX 48, 991289 ZX 52, 991291 ZX 60), p.24, Install Blades: "Reinstall blades and secure with original hardware. Torque to 156 – 217 N•m (115 – 160 lb-ft)." Also confirmed in the CRITICAL TORQUES table on p.43: "Blade to spindle 1380 – 1920 [lb-in] 115 – 160 [lb-ft] 156 – 217 [N·m]." Socket and thread size are not stated.

Gravely Compact-Pro 34 (Commercial Compact Zero-Turn) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Compact-Pro Operator's Manual 05245000A (model 991144 Compact-Pro 34), p.21, Install Blades: "Reinstall blades and secure with original hardware. Torque to 156 N•m – 217 N•m (115 lb-ft – 160 lb-ft)." Socket and thread size are not stated.

Gravely Pro-Stance (32/36/48/52/60, Commercial Stand-On) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Stance Operator's Manual 30329500 (models 994157 (32), 994149 (36), 994161 (48), 994162/994163 (52), 994164/994165 (60)), p.40, CRITICAL TORQUES table: "Mower Blade Hardware 115 – 160 [lb-ft] 156 – 217 [N·m]." Socket and thread size are not stated.

Gravely Pro-Stance Ultra (52/60/72, Commercial Stand-On) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Stance Ultra Operator's Manual 30233900B (models 994173 (52), 994170/994171 (60), 994175 (72)), p.28, Install Blades: "Secure blades to spindles with washers and hex bolts removed earlier. Torque to 156 – 217 N•m (115 – 160 lb-ft)." Socket and thread size are not stated.

Gravely Z-Stance (32/48/52, Commercial Stand-On) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Z-Stance Operator's Manual 09670500A (models 994160 (32), 994159 (48), 994158 (52)), p.27, Install Blades: "Secure blades to spindles with washers and hex bolts removed earlier. Torque to 156 – 217 N•m (115 – 160 lb-ft)." Socket and thread size are not stated.

Gravely Pro-Walk Hydro (36/48/52/60, Commercial Walk-Behind) blade bolt torque

115–160 lb-ft (156–217 N·m). Gravely Pro-Walk Hydro Operator's Manual 09468100 (models 988184 (36), 988185 (48), 988186 (52), 988187 (60)), p.25: "Secure lower spindle guards and blades to spindles with one bevel washer and hex bolt. Torque to 156 N•m – 217 N•m (115 lb-ft – 160 lb-ft)." Walk-behind, not a zero-turn/stand-on platform — deck is push/self-propelled with a lower spindle guard. Socket and thread size are not stated.

Pro tip for Gravely blade service

The Pro-Turn manual cautions that mating surfaces between spindle, lower spindle guard, blade and washer "MUST be free of debris to ensure correct tightness and alignment" — clean them before torquing, or the 115–160 lb-ft reading is meaningless.

Step-by-step Gravely blade-bolt reinstall

Disconnect the spark plug, engage parking brake, tip the mower (carb-side up). Block the blade with a 2×4 — never your hand. Use a 1/2" drive breaker bar with a 6-point socket. Clean threads with brake cleaner. No threadlocker needed unless your model manual specifies it. Torque in one smooth pull with a calibrated torque wrench. Re-check after first hour of cutting.

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