Buyers who send a clean RFQ with the right DFM call-outs already done get quotes that are 18–32% lower than buyers who send a drawing with no DFM. The difference is not negotiation — it is real BOM cost we can take out before quoting. Here are the 18 specific items we mark up in our standard DFM review, and what each one is typically worth.
DFM checks change by market: sealed automotive connectors point to USCAR-2, vehicle networks to SAE J1939, and aerospace routing to FAA Landing Navigation.
Every number in this list is per-unit cost-down on a representative 1,000-unit run of an industrial harness, 22–18 AWG, 12-to-32 circuits, IPC/WHMA-A-620 Class 3. Larger and smaller harnesses scale roughly linearly. The savings stack — we routinely see programs that started at $4.20 quoted unit cost finish DFM at $2.95 because eight of these items applied at once.
The 18 items
1. Terminal alternate to the next size down
If your drawing specifies a Molex 5556 series terminal but the same 0.6 mm² wire seats fine in a Molex 5557 series (same family, slightly smaller mating pin), the 5557 is typically 18–22% cheaper. Cost-down: $0.04–$0.07/terminal. Multiply by terminal count. On a 32-circuit harness this is $1.30–$2.20 per harness.
2. Wire gauge consolidation
If your drawing has both AWG 22 and AWG 24 signal wire, switching the AWG 24 to AWG 22 lets us run from one spool, eliminates one Komax cell setup, and saves quote-line wire-stocking overhead. The wire itself is 18% more expensive on a per-meter basis at AWG 22, but the labor saving and reduced setup overhead nets out to a small saving on small harnesses and a meaningful saving on long harnesses. Cost-down: −$0.03/m wire but −$0.42/unit labor on harness over 600 mm.
3. Single-source connector to dual-source
If your drawing names "TE 1-1827587-1" with no alternate, we cannot price it against the Hirose DF11 or Molex CGrid equivalents — even if the application is signal-only and any of the three families would work. Cost-down: $0.08–$0.18/mating pair when we get to validate alternate against your spec. Typical mid-program cost-out without disrupting the field.
4. Splice elimination
Each Y-branch splice on a Class 3 harness adds approximately $0.35 in inspection labor (the §10 documented exception). If we can re-route to put the connection at a connector instead, the splice goes away. Cost-down: $0.30–$0.45/splice eliminated.
5. Connector keying default acceptance
If your drawing requires a custom keying option on a connector that has a 12-week lead from the vendor (TE typical for special keys), specify that the "standard polarization key" is acceptable and we can pull from inventory. Cost-down: $0.04–$0.12/connector + 8 weeks lead time.
6. Heat-shrink to PVC tubing where IP is not required
Heat-shrink tubing is 4–7× the cost of PVC tubing for the same diameter. If the application is not waterproof and not high-temp, PVC tubing on a wire bundle accomplishes the same mechanical bundling for far less. Cost-down: $0.08–$0.22/meter.
7. Standard-color wire instead of custom stripe
A solid red 22 AWG UL 1007 ships from inventory at $0.04/meter. The same wire with a black stripe printed in 24 hours adds $0.05/meter and a 2-week lead. The stripe is invaluable when it carries information; if the operator does not need to read the stripe, drop it. Cost-down: $0.04–$0.08/meter.
8. Right-angle connector to straight where strain relief is added separately
A right-angle Molex MicroFit connector is roughly 28% more expensive than the straight version. If we can put a strain-relief boot on a straight connector instead, we capture the bend without paying for the right-angle housing. Cost-down: $0.06–$0.14/connector.
9. Reduce circuit count by combining shared returns
If your drawing has eight separate ground returns to the same chassis, that is eight terminals, eight wires, and eight crimp operations. One return with a Y-splice or one ring terminal at chassis is 1 terminal and 1 crimp. Cost-down: $0.18–$0.42/return eliminated. (Caveat: only apply when EMC and noise margin allow.)
10. Convert overmold to heat-shrink boot where flex life allows
An overmold transition adds tooling NRE ($1,800–$3,500) plus per-unit cycle time. If the application does not require IP67 or high-flex (over 1 million cycles), a SealCo or Raychem heat-shrink boot is cheaper. Cost-down: $0.32–$0.85/unit + tooling NRE eliminated.
11. Drop unnecessary IP rating
If the harness sits inside a sealed enclosure that is itself IP67, sealing the harness termination to IP67 too is double-paying. Specify the harness as IP54 splash-resistant and the connector pricing drops 18–24%. Cost-down: $0.40–$0.95/sealed connection.
12. Use stocked terminals over custom plating
Tin-over-copper is the default. Gold-plated terminals (typical TE 5+ μm gold) are 7–14× more expensive. Gold is mandatory for low-current dry-circuit applications (under 50 mA) and useful for high-cycle mating connectors. For everything else, tin works fine. Cost-down: $0.06–$0.18/terminal.
13. Standard wire jacket color over custom Pantone match
Lapp Olflex and Belden stock a 16-color matrix. Custom Pantone match adds $0.12/m for a 4-week pour. If your spec just says "orange", we use Lapp's standard orange. If it says "Pantone 165 C", we have to pay the upcharge. Cost-down: $0.10–$0.18/meter.
14. Reduce specified pull-force to actual application requirement
Many drawings spec 80 N pull-force on a 22 AWG terminal because that was the legacy spec from a 14 AWG drawing copied forward. The IPC-A-620 Class 3 minimum is 40 N for 22 AWG. Specifying 60 N target (our standard) instead of 80 N reduces inspection rework on borderline crimps. Cost-down: $0.04/terminal in reduced re-crimp.
15. Specify common cut-and-strip length over per-circuit length
If 18 of 24 circuits can use the same 95 mm strip-and-crimp length, run all 18 on one Komax program. Per-circuit unique strip lengths force per-circuit setup. Cost-down: $0.18/unit setup amortized.
16. Drop redundant labels
If the harness has a master serialization label, individual circuit labels are often redundant. Each printed flag adds $0.04 in label cost plus $0.06 in placement labor. Cost-down: $0.10/flag eliminated.
17. Allow tinned-copper braid as EMI shield alternate to foil
Aluminum-foil shielding is light and cheap but degrades after 100,000 flex cycles. JIS C 3406 tinned-copper braid lasts 10 million cycles — and on a static harness, a foil shield often passes the EMC requirement at 35% lower cost. Cost-down: $0.18–$0.42/m on shielded sections.
18. Specify the test program in the drawing
If the drawing says "100% continuity test" without specifying the wire-to-wire combinations, we have to write the Cirris test program from scratch and validate it against the schematic. If the drawing includes a Cirris CR/CH test list (or a netlist we can import), the test program is dropped in directly. Cost-down: $0.45–$1.20/unit on first-article setup, amortized.
How to actually use this list in your RFQ
The cleanest format is a markup column on the right side of the BOM. For each line, indicate (A) is an alternate acceptable, (B) which alternate is preferred, (C) what the cost-down target is. We score the RFQ at receipt and respond with which alternates we recommend within 24 hours. The scoring is automatic — clean DFM-marked RFQs go to the front of the queue, drawings without DFM call-outs go to the bottom (because they need 90 minutes of engineering review before quoting can start).
Worked example — a real RFQ that started at $4.20 and ended at $2.95
The harness: 32-circuit, 22-18 AWG, signal + low-current power, IPC Class 3, 1,000 units annual. The compounding effects of the eight applicable items:
| Item applied | Per-unit saving | Running unit cost |
|---|---|---|
| Initial quote (drawing as received) | — | $4.20 |
| (1) Terminal alternate, half the circuits affected | −$0.18 | $4.02 |
| (3) Dual-source connector approval on 4 housings | −$0.32 | $3.70 |
| (4) Two splice points re-routed to connector | −$0.70 | $3.00 |
| (6) Heat-shrink replaced by PVC tubing on 1.2 m | −$0.18 | $2.82 |
| (12) Tin-plated terminals on signal circuits | −$0.08 | $2.74 |
| (16) Three redundant flag labels eliminated | −$0.30 | $2.44 |
| Net rounding + small offsets re-priced | +$0.51 | $2.95 |
Total realized cost-down: $1.25/unit, or 30%. The NRE saved on the dropped overmold tooling was an additional $2,400 one-time. Items 2, 5, 7, 9 and 17 did not apply on this specific harness.
FAQ
Will you do DFM review without an order?
Yes, free, no NDA required for the first round. Send drawings or BOM to the engineering desk via the contact page and we respond within 24 hours with markup. About 60% of customers proceed to quote after the first DFM round.
Are these savings on top of the tariff savings?
Yes. The 25% Section 301 saving (covered in the Cavite tariff article) compounds with these DFM savings. A program that saves $1.25/unit through DFM and $0.64/unit through tariff routing is at $1.89/unit better than a no-DFM China quote — close to a 50% landed-cost reduction.
What is the cost of NOT doing DFM?
The harness still ships, but at the higher-quoted price plus the higher-warranty-rate cost from over-spec components. We tracked one customer's 2023 program where the no-DFM unit cost was $5.80 and the warranty rate was 1.4%. After 2024 DFM round, unit cost dropped to $4.10 and warranty dropped to 0.3%. The DFM was worth roughly $2.10/unit including warranty.
How do I know which alternates are real and which are sales theater?
Specifying alternates with vendor part numbers (e.g. "TE 1-1827587-1 OR Hirose DF11-12DP-2DSA OR Molex 5557-12R-DP") anchors the conversation in real BOMs. Vague alternates ("equivalent acceptable") get padded by every supplier on the planet because they can claim alternates that we cannot. For our preferred-alternate library, see the Custom Wire Harness page.
Closing
The 18 items above are the ones we re-extract from every DFM review on the Cavite line. They are not magic; they are the result of running the Cirris-to-BOM cost calculation on roughly 1,200 distinct harness families since 2018. About 4 of the 18 typically apply on any given drawing. The realized average saving is 22% off the un-DFM quoted price.
Send your drawing to the RFQ form and we will mark it up in red within 24 hours. For supporting context on the test gates and inspection cadence, see the Testing & Inspection page and the IPC Class 3 walk-through.
Sources
- XUDONG Cavite plant DFM review database, 2018–2024 (1,237 distinct harness families).
- Molex, TE Connectivity and Hirose 2024 connector price-break sheets.
- Lapp Group Olflex and Belden 2024 wire-jacket color matrix availability.
- IPC/WHMA-A-620 Rev D §7.3.5 — terminal pull-force minimum table.
- Cirris Systems CR-Series test programmer reference manual, 2023 edition.