GLS Reference
Commercial Body Shop Glossary
The terminology that appears on a written estimate, defined in plain language. If a line item on a quote from any shop is unclear, this is where to look it up before approving it. Written for Santa Ana fleet operators who approve repair without being body technicians.
- Terms defined
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- ADAS Calibration
- Resetting the cameras, radar units and sensors that drive lane keeping, collision alert and cruise systems after a repair moves a mounting point. Required whenever a windshield, bumper, mirror or bracket carrying a sensor is disturbed, and documented in the repair file.
- Aluminum Isolation
- Keeping aluminum repair work physically separated from steel work with dedicated tools, dedicated dust extraction and often a curtained area. Steel dust embedded in aluminum starts galvanic corrosion that shows up months later as blistering under the finish.
- Betterment
- A carrier's charge back to the owner when a repair replaces a worn item with a new one and the vehicle ends up better than it was before the loss. Commonly applied to tires, batteries and sometimes to badly faded paint on older fleet units.
- Blend Panel
- An adjacent panel that receives partial color so the eye cannot find the transition between new and existing finish. The repaired panel gets full coverage and the blend panel gets a fade, which is how a spot repair disappears on a large flat side.
- Body on Frame
- A construction method where a separate body or box is mounted to a ladder chassis rather than being integral to it. Most commercial straight trucks, service body units and stake beds are body on frame, which is why a damaged body can be replaced without replacing the chassis.
- Bulkhead
- The partition between the cargo area and the cab in a van or box body. It protects the driver from shifting load, stiffens the body and often carries shelving or a passthrough door. Bulkhead damage after a hard stop is a safety item, not a cosmetic one.
- Butt Joint with Insert
- A sectioning joint where two panel or rail ends meet squarely over an internal backing sleeve that carries the load across the seam. Used where a builder permits sectioning, and always at a location the published procedure names rather than wherever the damage happens to end.
- Clear Coat
- The transparent top layer sprayed over base color that carries gloss and ultraviolet protection. On fleet units running full sun in Orange County, clear coat failure usually shows up before color failure, appearing as dulling and then as peeling at panel edges.
- Corner Post
- The vertical structural member at the rear corner of a box body, tying the roof rail to the floor rail. Corner posts absorb dock impacts first and their condition determines whether a rear frame repair is straightforward or turns into a rebuild.
- Crossmember
- A lateral structural member spanning between the two main rails of a chassis or a trailer floor. Crossmembers carry floor load and resist twist. Cracked crossmembers rarely appear alone, so a proper repair maps every member rather than replacing only the obvious one.
- Cut and Buff
- Wet sanding a cured finish with fine abrasive and then polishing it back to gloss, used to remove dust nibs, minor orange peel or a texture mismatch. It removes clear coat film, so it can only be done once or twice on a given panel.
- Cycle Time
- The elapsed days from a unit entering the shop to release, including waiting on parts and waiting on approvals. Fleet managers care about cycle time more than labor rate, because a unit parked for an extra week usually costs more than the hourly difference between two shops.
- Dedicated Bay
- A bay held for one unit through the whole repair rather than shuffled between jobs. Dedicated bays cost the shop flexibility and buy the customer predictability, which is why they usually go to structural work and to multi-unit fleet programs on a schedule.
- Delamination
- Separation between bonded layers, most often an outer skin lifting from the foam core of an insulated body or vinyl lifting from failing paint. In refrigerated bodies it is a moisture problem first, because a saturated core loses insulation value and costs fuel every day.
- Direct Repair Program
- An arrangement where a carrier refers work to a shop under agreed pricing and documentation standards. It can speed approvals. It also means the shop has a relationship with the carrier, which every fleet owner should know about before choosing where a claim goes.
- Downdraft Booth
- A refinish booth that pulls filtered air from the ceiling downward past the vehicle and out through the floor, carrying overspray and airborne particles away from wet finish. It is the difference between a controlled film build and a surface full of debris.
- Downtime Cost
- The revenue or coverage a fleet loses per day a unit sits out of service, including any rental or subcontract cost to cover the route. Calculating it once turns repair scheduling from a cost conversation into a return conversation.
- E-Coat
- An electrodeposited corrosion primer applied at the factory by dipping the part in a charged bath so coverage reaches inside seams and cavities. It cannot be reproduced in a body shop, which is one reason a factory panel outperforms a bare aftermarket stamping in a coastal fleet.
- E-Track
- Horizontal or vertical track fastened to a cargo wall or floor that accepts fittings, straps and load bars anywhere along its length. Damaged or pulled E-track is common in delivery bodies and is a load security item worth repairing rather than working around.
- Feather Edge
- The tapered transition sanded around a repair so filler and primer step down gradually into the surrounding finish. A poor feather edge telegraphs through fresh paint as a visible ring within months, usually right when the unit is due for photographs.
- Frame Rack
- A fixed platform with anchoring points and hydraulic towers that a damaged unit is chained to so structure can be pulled back to published dimensions under measurement. The rack has to be anchored to a floor to pull against, which is why structural work is shop work.
- FRP Panel
- Fiberglass reinforced plastic panel, common as the skin on dry freight and insulated bodies. It resists dents and corrosion but cracks under sharp impact and cannot be straightened, so FRP damage is usually a panel section replacement rather than a repair.
- Galvanic Corrosion
- Accelerated corrosion where two dissimilar metals contact in the presence of moisture and one metal sacrifices itself. It is why aluminum and steel need isolation at fasteners and contact surfaces, and why the wrong fastener on a repair can start rust that had no reason to exist.
- Gross Vehicle Weight Rating
- The maximum loaded weight a manufacturer certifies for a vehicle, listed on the data plate and abbreviated GVWR. Upfit decisions live or die on it, because shelving, racks and a liftgate all consume payload capacity that the route was counting on.
- Huck Bolt
- A two piece mechanical fastener with a pin and a swaged collar, installed with a hydraulic tool and effectively permanent. Common on trailer and truck body structures because it holds clamp load under vibration far better than a threaded bolt that can back off.
- ICC Bar
- The rear impact guard beneath a trailer or straight truck body, sometimes called an underride guard. It is a federally regulated safety structure, so a bent or cracked guard is repaired or replaced to specification rather than straightened and sent back out.
- Kingpin
- The hardened steel pin on the underside of a semi trailer nose that locks into the tractor coupling plate. Kingpin wear, elongation or plate distortion is a coupling safety item, checked with a gauge rather than by eye, and repaired only to the specified method.
- Landing Gear
- The retractable support legs at the front of a semi trailer that hold the nose up when the tractor is uncoupled. Bent legs, a stripped crank gearbox or a damaged foot pad are routine repairs and are best done while a floor job already has the trailer open.
- Liftgate
- The hydraulic platform mounted at the rear of a body that raises and lowers freight between ground and deck. Capacity, platform size and mounting structure all have to match the route, and most repeat liftgate failures trace back to a specification that never matched the load.
- Mil Thickness
- Coating film build measured in thousandths of an inch. Too little and coverage and durability suffer. Too much and the finish traps solvent, softens and can crack later. Refinish measures it with a gauge rather than trusting the look of a wet panel.
- OEM Procedure
- The manufacturer's published repair instruction for a specific structure, naming the permitted joint locations, fastener types, adhesives, weld patterns and corrosion steps. It is the standard a repair is judged against, and it is why the same damage can be repaired differently on two similar units.
- Orange Peel
- A finish texture resembling the surface of citrus, caused by material that did not flow out fully before it set. Small amounts are normal and factory finishes have some. Heavy orange peel gets cut and buffed, or resprayed when it runs deeper than polishing can reach.
- Overspray
- Atomized coating that lands where it was not intended, on glass, trim, adjacent units or the shop floor. Controlled masking and booth airflow prevent it. Overspray found on a released unit is a quality failure and is corrected before the unit leaves the property.
- Panel Bond Adhesive
- A structural two part adhesive used to bond panels where the manufacturer specifies bonding instead of, or alongside, welding. It seals the joint against moisture at the same time, which is why substituting welds for specified adhesive creates a corrosion path.
- Pinchweld
- The flanged seam where two stamped panels are joined and welded, often at a rocker, door opening or windshield frame. Pinchwelds are lifting and clamping points, and a crushed pinchweld has to be reformed before anything mounted to it will sit correctly.
- Primer Sealer
- A coating applied over prepared repair areas to give uniform color holdout and to seal different substrates so they absorb topcoat evenly. Skipping it is how a repair area reads a slightly different shade than the rest of the panel in direct sun.
- Rail Section
- A replacement length of chassis or body rail installed in place of a damaged segment, joined at a location the builder permits. Sectioning is a specified repair when the joint is legal and the wrong answer when it is not, regardless of how much labor it would save.
- Reefer Panel
- An insulated sandwich panel forming the wall of a refrigerated body, usually a skin bonded to a foam core. Repairs have to restore the vapor seal as well as the surface, because a panel that looks fixed but leaks moisture will delaminate again from the inside.
- Rivet Bond
- A joining method combining structural adhesive with blind rivets or specified fasteners, giving both clamp load and a sealed bond line. Common on aluminum and mixed material bodies where heat from welding would damage the surrounding structure or coating.
- Roll Door
- The sectional overhead door on a box body, running in side tracks on rollers with a counterbalance spring. Most roll door complaints are track and header alignment rather than the panels themselves, which is why a rear frame repair usually includes retracking the door.
- Scuff and Shoot
- Abrading an existing sound finish just enough for adhesion and then spraying color over it, without stripping to bare substrate. It is legitimate on a sound panel and a bad idea on a chalked or peeling one, where the new finish inherits the old failure.
- Sectioning
- Replacing part of a structural component rather than the whole thing, cutting at a permitted location and joining to the published method. Done correctly it restores the designed load path at a fraction of full replacement labor. Done at the wrong joint it compromises the structure.
- Service Body
- A truck body with external lockable compartments around an open center bed, used by trades that carry tools and parts. Service body repairs usually involve compartment doors, latch alignment, corrosion at the compartment floors and the mounting to the chassis frame.
- Setup and Measure
- Anchoring a unit on the frame rack and taking a full set of dimensional measurements against published data before any pulling starts. It establishes what is actually bent rather than what looks bent, and the same measurements are repeated afterward for the file.
- Squeeze Type Resistance Spot Welding
- A welding method that clamps both sides of a joint and passes current through it to form a spot weld matching factory construction. Many published procedures require it specifically, because a substitute weld changes how the joint behaves in a subsequent impact.
- Sublet
- Work sent to an outside specialist and billed through the repair order, such as glass, upholstery or a calibration a shop does not perform in house. Sublet lines are legitimate. They should be identified on the estimate so the owner knows who is touching the unit.
- Substrate
- The base material being coated: steel, galvanized steel, aluminum, fiberglass or plastic. Each takes different preparation and different primer. A refinish that treats a fiberglass panel like a steel one is the reason some repairs peel at the edge within a year.
- Supplement
- An addition to the original estimate written after teardown reveals damage that could not be seen from outside. A supplement should arrive with photographs and a labor justification attached, and no supplement line should be performed before the owner or the carrier approves it.
- Teardown
- Removing panels, trim and assemblies to expose the full extent of damage before repair begins. Teardown is where an estimate written from photographs becomes an estimate written from evidence, and it is the single most useful hour in a commercial repair.
- Threshold Plate
- The wear plate at the rear sill of a box body where forklifts and hand trucks cross. Threshold plates take constant abuse and are a sacrificial item, so replacing one during a rear frame repair costs little and prevents the sill structure underneath from wearing away.
- Tie Down Ring
- A recessed or surface mounted anchor point in a cargo floor or wall rated for a specific load. Pulled or deformed rings are a load security failure and get replaced with the rated hardware, not with whatever bolt happens to fit the hole left behind.
- Total Loss
- The point at which repair cost plus salvage value exceeds a unit's actual cash value and a carrier declines to repair. On older commercial units the threshold arrives faster than owners expect, which is why an early repair against value comparison saves everyone a week.
- Upfit
- Installing equipment that turns a bare chassis or empty van into a working unit: shelving, bulkheads, racks, liftgates, interior lighting, power distribution and load securement. A written upfit specification applied identically across a fleet is what makes crews interchangeable between trucks.
- Wet Sand
- Sanding a cured finish with abrasive and water to level texture or defects before polishing. Water carries away residue and keeps the abrasive cutting cleanly, which produces a flatter surface than dry sanding and less heat in the clear coat.
- Zinc Rich Primer
- A primer loaded with zinc particles that protect bare steel sacrificially, corroding before the steel does. It goes on welded and ground areas where factory corrosion coating was destroyed, and skipping it is why some repairs rust at the seam within two coastal winters.
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Send the unit number, the damage, and a few photos. You get a written scope and a price band back, not a sales call.
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