2020 Buick Regal Lug Nut Torque & Bolt Specs

The source-backed 2020 Buick Regal lug nut torque is 100 ft-lbs (140 Nm). Match the application and hardware conditions in the cited manual; do not assume the same value applies to aftermarket hardware.

Lug nut torque: 100 ft-lbs (140 Nm).

This page distinguishes source-backed fields, unresolved conflicts and unverified legacy records for the 2020 Buick Regal. Match the exact hardware and manual conditions before maintenance. A source for one field does not verify the other specifications.

Field evidence: Lug nut torque confirmed against 2020 Buick Regal Sportback Owners Manual, p. PDF p. 338 (https://www.chevrolet.com/ownercenter/content/dam/gmownercenter/gmna/dynamic/manuals/2020/buick/regal/2020-buick-regal-owners-manual.pdf). OEM wheels and lug nuts as specified in the owner's manual trim: 6th Gen; axle: all Lug nut socket size is not verified; no specification is assumed. Lug nut thread size is not verified; no specification is assumed. Lug nut part number is not verified; no specification is assumed.

Lug Nut — torque: 100 ft-lbs (140 Nm) — 2020 Buick Regal Sportback Owners Manual, p. PDF p. 338. OEM wheels and lug nuts as specified in the owner's manual. Applies to: trim: 6th Gen (1 configuration).

GM passenger cars, crossovers and trucks use different wheel hardware families, including seat-style differences that matter when buying aftermarket lugs. Match the listed row and the original seat type; do not infer a truck value from a car, or the reverse.

Common fastener categories on the 2020 Buick Regal

Wheel / lug nut torque and thread spec (covered above)
Brake caliper bracket, mounting, and slide/guide-pin bolts are different fasteners. Confirm the exact axle, application and service-manual specification before reassembly.
Engine oil drain plug torque and tool size when this vehicle has a verified drain-plug record
Transmission pan, valve cover, and intake manifold bolts where the database has exact records
Suspension control arm, sway bar, tie rod end and ball joint torque
Spark plug torque only when a vehicle-specific spark-plug row is available
Differential cover bolts (RWD/4WD only) and transfer case fasteners

Repair guidance for this model year

For 2020 late-model work: Modern vehicles increasingly mix aluminum, high-strength steel and coated fasteners. Use the exact fastener record and service-manual procedure for the joint you are touching; do not adjust torque or add compounds unless the procedure calls for it.

Tools you will need

Metric and SAE socket set (8mm-22mm plus 1/4"-7/8"), 6-point impact-rated
Calibrated torque wrench (10-150 ft-lbs covers most automotive jobs; add a 0-250 ft-lbs wrench for truck lug nuts)
Breaker bar (24" minimum) for initial loosening
Penetrating oil (PB Blaster or Kroil) for any fastener over 5 years old
Replacement washers, threadlocker, anti-seize, or dry-thread preparation only when the exact service procedure specifies them

Frequently asked questions

What is the lug nut torque on a 2020 Buick Regal?

The source-backed lug-nut torque for the 2020 Buick Regal is 100 ft-lbs (140 Nm). Match the exact application, hardware and tightening conditions in the cited manual. Field evidence: Lug nut torque confirmed against 2020 Buick Regal Sportback Owners Manual, p. PDF p. 338 (https://www.chevrolet.com/ownercenter/content/dam/gmownercenter/gmna/dynamic/manuals/2020/buick/regal/2020-buick-regal-owners-manual.pdf). OEM wheels and lug nuts as specified in the owner's manual trim: 6th Gen; axle: all Lug nut socket size is not verified; no specification is assumed. Lug nut thread size is not verified; no specification is assumed. Lug nut part number is not verified; no specification is assumed.

What socket size do I need for the 2020 Buick Regal lug nuts?

Confirm the socket against the actual lug nut; no size is assumed here.

Are the 2020 Buick Regal fasteners metric or SAE?

Metric and SAE hardware can both appear on one vehicle, depending on the component and exact application. Use the individually verified field and the actual fastener or service manual rather than inferring a standard from the model year, make or generation. Bolt-head markings can help identify the hardware at the bench.

Other Buick Regal years

Same model, different model year — fastener spec may change. Always confirm against the year for your VIN.

→ 2020 Buick Regal oil drain plug torque & size

→ 2020 Buick Regal suspension & steering torque specs (control arm, ball joint, tie rod)

12 recorded 2020 Buick Regal fasteners

Per-field evidence and legacy records for the 2020 Buick Regal. A verified torque does not verify socket size, thread or part number. Unverified records are not installation instructions; conflicting specifications are withheld. 3 of the 12 records carry legacy review labels (last reviewed September 2026); those labels do not verify individual fields.

Brakes — 2020 Buick Regal

Brake fastener records and field evidence for the 2020 Buick Regal. Front Caliper Slide Pin (Front). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Front Caliper Bracket Bolt (Front). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Rear Caliper Bracket Bolt (Rear). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Rear Caliper Slide Pin (Rear). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified.

Engine — 2020 Buick Regal

Engine fastener records and field evidence for the 2020 Buick Regal. Oil Drain Plug. Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Spark Plug. Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Oil Filter. Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified.

Suspension — 2020 Buick Regal

Suspension fastener records and field evidence for the 2020 Buick Regal. Rear Lower Control Arm Bolt (Rear). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Front Lower Control Arm Bolt (Front). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified. Front Strut Top Nut (Front). Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified.

Wheels & Tires — 2020 Buick Regal

Wheels & Tires fasteners on the 2020 Buick Regal. Lug Nut. Torque: 100 ft-lbs (140 Nm). Source: 2020 Buick Regal Sportback Owners Manual, p. PDF p. 338 (https://www.chevrolet.com/ownercenter/content/dam/gmownercenter/gmna/dynamic/manuals/2020/buick/regal/2020-buick-regal-owners-manual.pdf). OEM wheels and lug nuts as specified in the owner's manual trim: 6th Gen; axle: all Socket size: not verified. Thread: not verified. Part number: not verified.

Transmission — 2020 Buick Regal

Transmission fasteners on the 2020 Buick Regal. Transmission Drain Plug. Torque: not verified. Socket size: not verified. Thread: not verified. Part number: not verified.

New to torquing wheels? Read our How lug nut torque works — the complete guide for star-pattern sequence, re-torque intervals, and how to read a lug spec — then compare any source-backed fields on this page with the actual hardware and service manual.

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