Lawn Mower Bolt Torque Specs
Blade bolt torque for walk-behind lawn mowers, by MOWER brand — not engine brand. No Briggs & Stratton, Kohler XT or Tecumseh document publishes a blade-bolt torque; that spec comes from the mower manufacturer. Plus head bolt, spark plug, flywheel nut and oil drain plug torque for the Briggs, Honda GCV/GX, Kohler XT and Tecumseh engines that power these mowers.
Blade bolt torque, by mower brand/model
Blade-bolt torque is set by the mower manufacturer, not the engine maker. Briggs & Stratton, Kohler XT and Tecumseh service manuals print no blade torque at all — Kohler's own manual says "Refer to operating instruction of equipment that this engine powers." Find your mower's model number and use its manual; the figures below are quoted from those manuals.
| Mower | Blade bolt torque | Hardware | Source |
|---|---|---|---|
| Honda walk-behinds (HRX217, HRN216, HRR216, HRS216, HRC216, HRB216) | 36–43 ft-lb (49–59 N·m) | Two 10 mm blade bolts, 14 mm (6-point) socket | Honda HRX217VKA/HYA/VLA/VYA Owner’s Manual 00X31-VH7-N071, p.11 |
| Troy-Bilt TB230 / TB260 / TB280 ES (MTD) | 450–600 in-lb (37.5–50 ft-lb, our conversion; MTD prints in-lb only) | Single hex bolt through the blade bell support into the blade adapter | Troy-Bilt Operator’s Manual, MTD form 769-08408, p.18 |
| Craftsman M105 21" Push Mower (MTD) | 450–600 in-lb (37.5–50 ft-lb, our conversion; MTD prints in-lb only) | Single hex bolt — same hardware as the Troy-Bilt row above | Craftsman Instruction Manual (CMXGMAM2703840), MTD form 769-19750, p.14 |
| Toro Recycler 21"/22", TimeMaster 30" (walk-behind) | |||
| Husqvarna LC221A and other walk-behinds | |||
| Any mower with a Briggs & Stratton, Kohler XT or Tecumseh engine not listed above | Set by your mower's manual — the engine maker publishes no blade-bolt torque. |
Briggs & Stratton Check Chart MS-3992-10/04, p.1; Kohler Service Manual 14 690 01 Rev. G, p.1 & p.6; Tecumseh L-Head Technician’s Handbook 692509, printed p.91 (PDF p.95) — none of the three prints a blade-bolt row |
Engine fastener torque, by engine model series
Head bolts, spark plugs, flywheel nuts and oil drain plugs are printed by the ENGINE maker, unlike the blade bolt above. Match the row to your engine's stamped model number, not a mower brand or marketing name.
| Engine | Fastener | Torque | Source |
|---|---|---|---|
| Briggs & Stratton L-head singles, model series 60000–130000 | Cylinder head bolt | 140 in-lb | Briggs & Stratton Check Chart MS-3992-10/04, p.1 |
| Briggs & Stratton L-head singles, model series 60000–130000 | Flywheel nut | 55 ft-lb Briggs chart 270962 prints 60 ft-lb for model series 100200, 100900 and 130000; check which chart lists your stamped model number. |
Briggs & Stratton Check Chart MS-3992-10/04, p.1 |
| Briggs & Stratton L-head singles, model series 60000–130000 | Spark plug | Not printed on any Briggs & Stratton L-head chart on file — check your engine's operator's manual. |
Briggs & Stratton Check Chart MS-3992-10/04 has no plug row; the Intek V-Twin chart (180 in-lb) is a different engine family |
| Briggs & Stratton L-head singles, model series 60000–130000 | Oil drain plug | Not printed on any Briggs & Stratton L-head chart on file — check your engine's operator's manual. |
Briggs & Stratton Check Chart MS-3992-10/04 has no drain-plug row; the Intek V-Twin chart (125 in-lb) is a different engine family |
| Kohler XT-6 / XT650 / XT675 / XT-7 / XT775 / XT8 | Spark plug | 27 N·m (20 ft-lb) | Kohler Service Manual 14 690 01 Rev. G, p.6 |
| Kohler XT-6 / XT650 / XT675 / XT-7 / XT775 / XT8 | Flywheel retaining nut | 51.5 N·m (38 ft-lb) | Kohler Service Manual 14 690 01 Rev. G, p.6 |
| Kohler XT-6 / XT650 / XT675 / XT-7 / XT775 / XT8 | Carburetor stud fastener | 8 N·m (71 in-lb) | Kohler Service Manual 14 690 01 Rev. G, p.5 |
| Kohler XT-6 / XT650 / XT675 / XT-7 / XT775 / XT8 | Cylinder head fastener (torque in 2 increments) | first 14 N·m (123 in-lb), finally 27.8 N·m (246 in-lb) | Kohler Service Manual 14 690 01 Rev. G, p.6 |
| Kohler XT-6 / XT650 / XT675 / XT-7 / XT775 / XT8 | Oil drain plug | 13.6 N·m (120 in-lb) Apply thread sealant around three full threads before assembly (Kohler footnote 7). |
Kohler Service Manual 14 690 01 Rev. G, p.6 |
| Tecumseh 4-cycle L-head (LEV/VSK, TVS/TVXL columns) | Spark plug | 250 in-lb (21 ft-lb, 28.5 N·m) (conflict) The same handbook’s maintenance procedure instead says "15 foot pounds (20.4 Nm)" — a Tecumseh-internal conflict, shown as both rather than picking one. |
Tecumseh L-Head Technician’s Handbook 692509, printed p.91 (PDF p.95, torque table) and printed p.4 (PDF p.8, maintenance procedure) |
| Tecumseh 4-cycle (every column) | Carburetor to intake pipe | 70 in-lb (6 ft-lb, 8 N·m) | Tecumseh L-Head Technician’s Handbook 692509, printed p.91 (PDF p.95) |
| Tecumseh 4-cycle (every column) | Cylinder head bolts | 200 in-lb (16.5 ft-lb, 22.5 N·m) | Tecumseh L-Head Technician’s Handbook 692509, printed p.91 (PDF p.95) |
| Tecumseh 4-cycle (TVXL, TVS and most VM/TVM/LAV columns) | Flywheel nut | 450 in-lb (37.5 ft-lb, 51 N·m) aluminium; 550 in-lb (46 ft-lb, 62 N·m) cast iron | Tecumseh L-Head Technician’s Handbook 692509, printed p.91 (PDF p.95) |
| Honda GCV135 / GCV160 / GCV190 / GSV190 | Cylinder head cover bolt (no separate head bolts) | 12 N·m (9 lbf·ft), 4 × 6x12 mm bolts | Honda "GCV135-GCV160-GCV190-GSV190 Engine Assembly" information sheet, p.1 |
| Honda GCV190 (HRX217) | Spark plug | 14 ft-lb (20 N·m) | Honda HRX217 Owner’s Manual 00X31-VH7-N071, p.13 |
| Honda GCV135 / GCV160 / GCV190 / GSV190 | Flywheel nut | Honda engine-assembly sheet, p.1, disagrees with Honda shop manual 61ZM000 | |
| Honda GCV160 / GCV190 | Oil drain plug | None fitted — drain through the oil filler neck by tilting the engine. |
Honda GCV135E/GCV160E Owner’s Manual 3RZ0M600, p.5 |
| Honda GX120 / GX160 / GX200 | Spark plug | 18 N·m (13 lbf-ft) | Honda GX120/160/200 Shop Manual 62Z4H000, TORQUE VALUES p.2-6 |
| Honda GX120 / GX160 / GX200 | Cylinder head bolt | 24 N·m (18 lbf-ft) | Honda GX120/160/200 Shop Manual 62Z4H000, TORQUE VALUES p.2-6 |
| Honda GX120 / GX160 / GX200 | Engine oil drain plug bolt | 18 N·m (13 lbf-ft) | Honda GX120/160/200 Shop Manual 62Z4H000, TORQUE VALUES p.2-6 |
| Honda GX120 / GX160 / GX200 | Flywheel nut | 75 N·m (55 lbf-ft) | Honda GX120/160/200 Shop Manual 62Z4H000, TORQUE VALUES p.2-6 |
Blade torque is a mower spec, not an engine spec
Kohler's XT service manual says it outright: "Refer to operating instruction of equipment that this engine powers." Briggs & Stratton and Tecumseh engine charts print no blade-bolt row either. Honda's walk-behind mowers (HRX217, HRN216, HRR216, HRS216, HRC216, HRB216) are the one line that DOES publish a figure across the board: 36–43 ft-lb (49–59 N·m), removed and installed with a 14 mm socket — not the 15/16" that circulates online. See the full table below for Honda, Troy-Bilt, Craftsman, and links to the sourced Toro and Husqvarna model pages.
Check the adapter, not just the bolt
A blade that keeps coming loose is usually a worn blade adapter or a bent crankshaft, not an under-torqued bolt. Inspect the adapter keyway and the blade seating surface every time the blade is off. A cracked adapter will let the blade shift under load no matter how accurately you torque the bolt, and that is how blades come off decks.
Torque wrench, not the impact gun
Blade bolts sit in soft aluminium or thin steel adapters and strip easily. Use a torque wrench for the final pull, hold the blade with a block of wood rather than your hand, and wear gloves. Honda's own owner's manual is explicit: "If you do not have a torque wrench, have an authorized Honda servicing dealer tighten the blade bolts." Re-check the bolt after the first hour of cutting following any blade change.
Related lookups
- Briggs & Stratton Blade Bolt Torque
- Walk-Behind Mower Specs
- Toro Blade Bolt Torque by Model
- Husqvarna Blade Bolt Torque by Model
- Mower Deck Spindle Bolt Torque Chart
- Honda GCV Engine Torque Specs
- All Small Engine Torque Specs
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