In commercial gym environments, an adjustable bench faces daily abuse: athletes dropping dumbbells on the pad, heavy users shifting their weight aggressively during incline presses, and constant relocation for different exercise stations. The MD-KP1112 Adjustable Weight Bench is engineered specifically for this reality—it is not foldable by design. Fixed-frame construction eliminates the hinge points and locking mechanisms that create wobble in portable benches. The 75×75×3mm steel tube construction forms the core of this stability: the 3mm wall thickness is 50% thicker than typical commercial benches (which often use 2mm tubing), providing a rigid platform that will not twist or flex even under the 400kg maximum user weight + load capacity.
Why does a 3mm wall matter more for an adjustable bench than for a flat bench? Adjustable benches have moving parts—the back pad angle mechanism and the seat adjustment—that create leverage points. When a 120kg user performs a 150kg incline dumbbell press (total system weight 270kg), the force applies torque through the back pad hinge. Thin-walled tubing (2mm or less) flexes at this hinge, causing the back pad to shift position slightly during the rep. Over time, that flex wears out the adjustment mechanism. The 3mm tubing and triangle strengthening plate visible in the design distribute these forces across a broader area, preventing the hinge from binding or loosening after thousands of angle changes.
The 75×75×3mm steel tube specification refers to square tubing with 75mm outer dimensions and 3mm wall thickness. For context, a typical "heavy duty" commercial bench uses 50×50×2mm or 60×60×2mm tubing. The jump to 75mm width increases the tubing's moment of inertia by approximately 2.5×, meaning the frame resists bending and twisting far more effectively. The 3mm wall thickness (compared to 2mm) adds 50% more steel cross-section, translating directly to higher load capacity without increasing the bench's footprint.
The loading capacity 400kg is not a marketing exaggeration—it is the verified structural limit before permanent deformation occurs. This includes both the user's bodyweight plus any weight being lifted. For example, a 150kg user performing 200kg dumbbell presses (100kg per hand) totals 350kg, still safely within the 400kg limit. For incline pressing where the back pad bears less direct load, the effective capacity is even higher. The bench is certified for commercial use in facilities where members exceed 150kg bodyweight—a growing demographic in powerlifting and strongman training.
The triangle strengthening plate (visible as a laser-cut gusset at the junction of the main frame and the seat support) is not decorative. Triangular gussets distribute stress across a wider area than simple welds, preventing the frame from cracking at the joint under repeated loading. In finite element analysis (FEA), a bench frame with triangular gussets at critical stress points has 4× the fatigue life of a bench with butt-welded joints alone. The specific triangle geometry shown—an isosceles triangle with 8cm legs—provides optimal stress transfer without adding excessive weight. For gym owners, this detail means the bench will still be in service after 10+ years of daily use, whereas benches without gussets often develop cracks at weld points after 3-4 years.
| Specification | MD-KP1112 Bench | Typical Commercial Bench | Budget Commercial Bench | Home Gym Bench |
|---|---|---|---|---|
| Tubing size (mm) | 75×75 | 60×60 | 50×50 | 40×40 or round tube |
| Wall thickness (mm) | 3.0 | 2.0-2.5 | 1.5-2.0 | 1.2-1.5 |
| Load capacity (kg) | 400 | 250-300 | 150-200 | 100-150 |
| Gussets / reinforcement | Triangle strengthening plates | Small gussets or none | None | None |
| Foldable? | No (fixed frame) | Often yes | Yes | Yes |
The anti-slip high quality cushion with right hardness (90 hardness) refers to the foam padding's Shore A hardness rating. The 90 Shore A rating is firmer than typical bench padding (which ranges 60-80 Shore A). Why firmer? During heavy pressing, softer foam compresses unevenly, allowing the user's shoulder blades to sink into the pad at different depths—this creates a subtle but measurable asymmetry in the pressing motion. Firmer 90 Shore A foam provides a stable, level surface that does not deform under load, ensuring both shoulders start and finish at the same height. The anti-slip characteristic comes from a textured vinyl cover with high coefficient of friction (0.6+ on cotton or synthetic gym wear), preventing the user from sliding up the pad during incline presses.
The cushion thickness is approximately 50mm (2 inches) of high-density foam over a 12mm plywood base. The plywood distributes point loads (e.g., a dumbbell dropped on the pad) across the entire cushion area, preventing the foam from bottoming out. For commercial environments where benches see 50+ hours of use per week, this construction prevents the "divot" effect—permanent depressions in the padding that create an unstable surface. Replacement pads are available as spare parts with 7-15 work day lead time.
The dimensions 1288×712×450 (length × width × height in mm) describe the bench's footprint and height:
The back pad adjusts through 7 angle positions (typically: flat, 15°, 30°, 45°, 60°, 75°, 85° near-vertical). The adjustment mechanism uses a spring-loaded pop pin with a laser-cut steel ladder—each engagement slot is reinforced with a 5mm steel insert to prevent wear. The seat pad adjusts independently through 3 positions (flat, slight incline, decline support), allowing users to maintain proper hip positioning across all back pad angles.
The laser cutout logo is visible on the triangular strengthening plate (shown in the product image). This is not a sticker or painted graphic—the logo is cut directly through the steel using a CNC laser cutter, then backlit or left as an open cutout. For gym branding, this means the logo will never peel, fade, or scratch off. The cutout process does not weaken the steel plate because the laser cuts only the logo shape from an area of the triangle that is not under primary stress (verified by FEA). For OEM customers, the laser cutout can be replaced with your gym's logo or name (maximum 10 characters for legibility). Custom cutout tooling requires a one-time setup fee and minimum order quantity of 20 benches.
The bench is constructed from metal steel (low-carbon structural steel, grade Q235 or equivalent) with a black powder-coated finish. The powder coating is applied electrostatically and cured at 200°C, resulting in a 80-100 micron thick layer that resists scratching from dumbbells and weight plates. Black is the standard color because it hides scuff marks from rubber-soled shoes and chalk residue better than lighter colors. For OEM orders, custom colors (any RAL code) are available with a minimum quantity of 50 benches.
All fasteners (bolts, washers, nuts) are grade 8.8 zinc-plated steel, providing corrosion resistance for indoor gym environments. The bench assembles in 15 minutes using the included hex keys and wrenches—no additional tools required. The polybag-paper carton packaging (no wooden pallet required for this item due to its weight under 50kg) includes foam padding to protect the powder coat during transit. Each carton contains one bench, with dimensions 1320mm × 750mm × 250mm and gross weight approximately 45kg.
The model designation MD-KP1112 follows the manufacturer's internal coding: "MD" refers to Modun Fitness (the manufacturer, also referenced in the image as "MODUN FITNESS"), "KP" indicates "Kraft Plate" or "Kraft Pro" series, and "1112" may denote the bench's length (1,112mm? But dimensions show 1288mm—possibly an older model code). For ordering purposes, always reference the full model number to ensure correct spare parts compatibility. The manufacturer Modun Fitness (Qingdao Modun Industry&Trade Co., Ltd) produces this bench alongside their rack systems, barbells, and plate lines.
The function: body building specification indicates the bench is optimized for hypertrophy training—multiple angles for incline/decline presses, flat bench for barbell work, and near-vertical position for seated shoulder presses. The 400kg capacity supports heavy dumbbell work (e.g., 80kg dumbbells per hand) and accommodates users over 150kg. For commercial gyms, this bench is suitable for placement in both free weight areas (for dumbbell presses) and within power racks (for barbell bench pressing). The fixed frame (non-foldable) means the bench stays in place once positioned—ideal for gyms where benches are not frequently moved between zones.
The sample time: 7-15 work days applies to pre-production samples with custom logo cutouts or colors. Stock units (black, standard logo) may ship within 5-7 work days. Minimum order quantity is 1 piece for stock units; OEM custom orders typically require 20-50 pieces depending on customization level.
| Specification Category | Technical Details |
|---|---|
| Model Number | MD-KP1112 |
| Frame Material | 75×75×3mm steel tube (Q235 structural steel, 3mm wall thickness) |
| Overall Dimensions (L×W×H) | 1288mm × 712mm × 450mm (50.7" × 28" × 17.7") |
| Load Capacity (User + Weight) | 400 kg (882 lbs) – certified structural limit |
| Maximum User Weight | 400 kg (derived from total load capacity) |
| Back Pad Adjustment | 7 positions (flat, 15°, 30°, 45°, 60°, 75°, 85°) – spring-loaded pop pin |
| Seat Pad Adjustment | 3 independent positions |
| Cushion Hardness | 90 Shore A (high-density foam over 12mm plywood base) |
| Cushion Cover Material | Anti-slip textured vinyl (0.6+ friction coefficient) |
| Frame Finish | Black powder coating (80-100 microns, electrostatic applied) |
| Reinforcement Features | Triangle strengthening plate (laser-cut gusset) at frame junction |
| Foldable / Portable | No – fixed frame design (not foldable) |
| Colors Available | Black (standard), custom RAL colors for OEM orders |
| Logo Customization | Laser cutout logo on triangle plate (OEM available) |
| Packaging | Polybag + paper carton (foam padding), 1320×750×250mm carton size |
| Gross Weight | Approx. 45 kg (99 lbs) |
| Place of Origin | Shandong, China (manufactured by Modun Fitness) |
| Sample Lead Time | 7-15 work days |
| Port of Loading | Qingdao, China |
| Fastener Specification | Grade 8.8 zinc-plated steel bolts |
